<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112007000700001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biomarcadores del estado inflamatorio: nexo de unión con la obesidad y complicaciones asociadas]]></article-title>
<article-title xml:lang="en"><![CDATA[Inflammatory biomarkers: the link between obesity and associated pathologies]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zulet]]></surname>
<given-names><![CDATA[M.ª A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puchau]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navarro]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martí]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Navarra Departamento de Ciencias de la Alimentación, Fisiología y Toxicología ]]></institution>
<addr-line><![CDATA[Pamplona ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<volume>22</volume>
<numero>5</numero>
<fpage>511</fpage>
<lpage>527</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112007000700001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112007000700001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112007000700001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo de este trabajo ha consistido en realizar una revisión de los biomarcadores que actualmente se proponen como el nexo de unión entre la inflamación, la obesidad y complicaciones asociadas, seleccionando los estudios llevados a cabo y las cuestiones pendientes. Cada vez hay mayor evidencia científica de que la inflamación puede jugar un papel importante en la etiología de diversas enfermedades crónicas de gran relevancia para la salud pública. En los últimos años, distintos estudios han sugerido que la obesidad podría ser un desorden inflamatorio. Asimismo, el estrés oxidativo se ha propuesto como un potencial inductor de la inflamación y de la susceptibilidad a la obesidad y patología asociadas. Entre los biomarcadores relacionados con la obesidad, la resistencia insulínica, las enfermedades cardiovasculares y el síndrome metabólico se encuentran: el factor de necrosis tumoral alfa, interleuquinas 6 y 18, angiotensinógeno, factor de crecimiento TGF-beta, inhibidor de la activación del plasminógeno, leptina, resistina, proteína C reactiva, amiloide A, ácido siálico, marcadores de disfunción endotelial (factor von Willebrand, ICAMs, vCAMs) factor 3 del sistema del complemento, haptoglobina, glicoproteína zinc-alfa2, eotaxina, visfatina, apelina, alfa1-antitripsina, vaspina, omentina, proteína transportadora de retinol 4, ceruloplasmina, adiponectina y desnutrina. Algunos de estos biomarcadores son buenos predictores de riesgo cardiovascular (inhibidor de la activación de plasminógeno 1, angiotensinógeno, fibrinógeno, ácido siálico, factor 3 del complemento y proteína C reactiva), adiposidad (leptina, visfatina, resistina, haptoglobina) y/o resistencia insulínica (ácido siálico, proteína C reactiva, inhibidor de la activación de plasminógeno 1, factor von Willebrand). Sin embargo, todavía queda por dilucidar el papel de muchos de ellos en la etiología de la obesidad y comorbilidades asociadas en humanos, así como los factores implicados en su regulación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The objetive of this article is to review biomarkers that have been suggested in recent years as the link between inflammation, obesity and associated co-morbidities, as well as some questions that yet remain unclear. Increasing evidence indicates the important role of inflammation in the etiology of major public health problems. In the last years, several studies have proposed that obesity might be a inflammatory disorder. In addition, oxidative stress has been suggested as a potential inductor of inflammatory status and susceptibility to obesity and related disorders. Several biomarkers are being suggested as the link between obesity, insulin resistance, cardiovascular disease and metabolic syndrome, such as tumor necrosis factor alfa, interleukin-6 and -18, angiotensinogen, transforming grow factor beta, plasminogen activator inhibitor-1, leptin, resistin, C-reactive protein, serum amyloid A, sialic acid, fibrinogen, markers of endothelial dysfunction (von Willebrand factor, ICAMs, VCAMs), complement factor 3, haptoglobin, Zinc-alpha2-glycoprotein, eotaxin, visfatin, apelin, alpha1- antitrypsin, vaspin, omentin, retinol binding protein 4, ceruloplasmin, adiponectin and desnutrin. Some of this biomarkers are good predictors of cardiovascular risk (plasminogen activator inhibitor-1, sialic acid, fribrinogen, complement factor 3, C-reactive protein), adiposity (leptin, visfatin, resistin, haptoglobin) and/or insulin resistance (sialic acid, C-reactive protein, plasminogen activator inhibitor-1, von Willebrand factor). However, it is currently unclear the role of many of them concerning inflammatory processes in humans, as well as the factors involved in their regulation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Inflamación]]></kwd>
<kwd lng="es"><![CDATA[Biomarcadores del estado inflamatorio]]></kwd>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Resistencia insulínica]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad cardiovascular]]></kwd>
<kwd lng="es"><![CDATA[Síndrome metabólico]]></kwd>
<kwd lng="en"><![CDATA[Inflammation]]></kwd>
<kwd lng="en"><![CDATA[Biomarkers of inflammation]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Insulin resistance]]></kwd>
<kwd lng="en"><![CDATA[Cardiovascular disease]]></kwd>
<kwd lng="en"><![CDATA[Metabolic syndrome]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><a name="top"></a><b>REVISIÓN</b></font></p>     <p align="right">&nbsp;</p>     <p align="left"><font face="Verdana" size="4"><b>Biomarcadores del estado inflamatorio: nexo de uni&oacute;n con la obesidad y complicaciones asociadas</b></font></p>     <p><b><font face="Verdana" size="4">Inflammatory biomarkers: the link between obesity and associated pathologies</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>M.ª A. Zulet, B. Puchau, C. Navarro, A. Mart&iacute; y J. A. Mart&iacute;nez</b></font></p>     <p><font face="Verdana" size="2">Departamento de Ciencias de la Alimentaci&oacute;n, Fisiolog&iacute;a y Toxicolog&iacute;a. Universidad de Navarra. Pamplona. Espa&ntilde;a.</font></p>     <p><font face="Verdana" size="2"><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">El objetivo de este trabajo ha consistido en realizar una revisi&oacute;n de los biomarcadores que actualmente se proponen como el nexo de uni&oacute;n entre la inflamaci&oacute;n, la obesidad y complicaciones asociadas, seleccionando los estudios llevados a cabo y las cuestiones pendientes. Cada vez hay mayor evidencia cient&iacute;fica de que la inflamaci&oacute;n puede jugar un papel importante en la etiolog&iacute;a de diversas enfermedades cr&oacute;nicas de gran relevancia para la salud p&uacute;blica. En los &uacute;ltimos a&ntilde;os, distintos estudios han sugerido que la obesidad podr&iacute;a ser un desorden inflamatorio. Asimismo, el estr&eacute;s oxidativo se ha propuesto como un potencial inductor de la inflamaci&oacute;n y de la susceptibilidad a la obesidad y patolog&iacute;a asociadas. Entre los biomarcadores relacionados con la obesidad, la resistencia insul&iacute;nica, las enfermedades cardiovasculares y el s&iacute;ndrome metab&oacute;lico se encuentran: el factor de necrosis tumoral alfa, interleuquinas 6 y 18, angiotensin&oacute;geno, factor de crecimiento TGF-beta, inhibidor de la activaci&oacute;n del plasmin&oacute;geno, leptina, resistina, prote&iacute;na C reactiva, amiloide A, &aacute;cido si&aacute;lico, marcadores de disfunci&oacute;n endotelial (factor von Willebrand, ICAMs, vCAMs) factor 3 del sistema del complemento, haptoglobina, glicoprote&iacute;na zinc-alfa2, eotaxina, visfatina, apelina, alfa1-antitripsina, vaspina, omentina, prote&iacute;na transportadora de retinol 4, ceruloplasmina, adiponectina y desnutrina. Algunos de estos biomarcadores son buenos predictores de riesgo cardiovascular (inhibidor de la activaci&oacute;n de plasmin&oacute;geno 1, angiotensin&oacute;geno, fibrin&oacute;geno, &aacute;cido si&aacute;lico, factor 3 del complemento y prote&iacute;na C reactiva), adiposidad (leptina, visfatina, resistina, haptoglobina) y/o resistencia insul&iacute;nica (&aacute;cido si&aacute;lico, prote&iacute;na C reactiva, inhibidor de la activaci&oacute;n de plasmin&oacute;geno 1, factor von Willebrand). Sin embargo, todav&iacute;a queda por dilucidar el papel de muchos de ellos en la etiolog&iacute;a de la obesidad y comorbilidades asociadas en humanos, as&iacute; como los factores implicados en su regulaci&oacute;n.</font></p>     <p><font face="Verdana" size="2"><B>Palabras clave:</B> Inflamaci&oacute;n. Biomarcadores del estado inflamatorio. Obesidad. Resistencia insul&iacute;nica. Enfermedad cardiovascular. S&iacute;ndrome metab&oacute;lico.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><B>ABSTRACT</B></font></p>     <p><font face="Verdana" size="2">The objetive of this article is to review biomarkers that have been suggested in recent years as the link between inflammation, obesity and associated co-morbidities, as well as some questions that yet remain unclear. Increasing evidence indicates the important role of inflammation in the etiology of major public health problems. In the last years, several studies have proposed that obesity might be a inflammatory disorder. In addition, oxidative stress has been suggested as a potential inductor of inflammatory status and susceptibility to obesity and related disorders. Several biomarkers are being suggested as the link between obesity, insulin resistance, cardiovascular disease and metabolic syndrome, such as tumor necrosis factor alfa, interleukin-6 and -18, angiotensinogen, transforming grow factor beta, plasminogen activator inhibitor-1, leptin, resistin, C-reactive protein, serum amyloid A, sialic acid, fibrinogen, markers of endothelial dysfunction (von Willebrand factor, ICAMs, VCAMs), complement factor 3, haptoglobin, Zinc-alpha2-glycoprotein, eotaxin, visfatin, apelin, alpha1- antitrypsin, vaspin, omentin, retinol binding protein 4, ceruloplasmin, adiponectin and desnutrin. Some of this biomarkers are good predictors of cardiovascular risk (plasminogen activator inhibitor-1, sialic acid, fribrinogen, complement factor 3, C-reactive protein), adiposity (leptin, visfatin, resistin, haptoglobin) and/or insulin resistance (sialic acid, C-reactive protein, plasminogen activator inhibitor-1, von Willebrand factor). However, it is currently unclear the role of many of them concerning inflammatory processes in humans, as well as the factors involved in their regulation.</font></p>     <p><font face="Verdana" size="2"><B>Key words:</B> Inflammation. Biomarkers of inflammation. Obesity. Insulin resistance. Cardiovascular disease. Metabolic syndrome.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana" size="2">La inflamaci&oacute;n es fundamentalmente una respuesta de car&aacute;cter protector, cuyo objetivo &uacute;ltimo es defender al organismo de la lesi&oacute;n celular iniciada por microorganismos, toxinas, al&eacute;rgenos, etc., as&iacute; como de las consecuencias de la misma y de las c&eacute;lulas y restos tisulares necr&oacute;ticos1. Estos procesos inflamatorios y de reparaci&oacute;n pueden llegar a ser lesivos y perjudiciales si adquieren car&aacute;cter cr&oacute;nico<sup>1, 2</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Los mecanismos precisos que enlazan la inflamaci&oacute;n con la obesidad y complicaciones asociadas permanecen todav&iacute;a sin establecer completamente<sup>3</sup>. Durante los &uacute;ltimos a&ntilde;os, diversos estudios han propuesto que la obesidad podr&iacute;a ser un desorden inflamatorio<sup>4</sup>. Adem&aacute;s, &eacute;ste estado inflamatorio, ha sido propuesto como el nexo de uni&oacute;n entre la obesidad y des&oacute;rdenes asociados, como son la resistencia insul&iacute;nica, los des&oacute;rdenes cardiovasculares y el s&iacute;ndrome metab&oacute;lico<sup>5</sup>. A este respecto, se ha asumido en general que la inflamaci&oacute;n es una consecuencia de la obesidad, sin embargo algunos estudios recientes han sugerido que la inflamaci&oacute;n podr&iacute;a ser realmente una posible causa de la obesidad<sup>4, 6, 7</sup>. La respuesta inflamatoria iniciada en el tejido adiposo blanco, produce una situaci&oacute;n cr&oacute;nica a nivel sist&eacute;mico, generando un c&iacute;rculo vicioso, el cual finalmente conduce a resistencia insul&iacute;nica, ateroesclerosis y alteraciones propias del s&iacute;ndrome metab&oacute;lico<sup>7</sup>. Adem&aacute;s, el estr&eacute;s oxidativo se ha propuesto como un potencial inductor del estado inflamatorio y susceptibilidad a la obesidad y patolog&iacute;as asociadas<sup>8</sup>.</font></p>     <p><font face="Verdana" size="2">Entre los principales mediadores de la inflamaci&oacute;n liberados por el tejido adiposo y m&aacute;s estudiados se encuentran la IL-6, el TNF-alfa, el angiotensin&oacute;geno (AGT) y el factor de crecimiento TGF-beta; y hormonas secretadas por los adipocitos como la leptina y la resistina<sup>9</sup>. Adem&aacute;s, estos mediadores de la inflamaci&oacute;n se han asociado con efectos negativos sobre la hipertensi&oacute;n, diabetes, dislipidemias, infecciones y c&aacute;ncer<sup>7, 9</sup>. Junto con el tejido adiposo, las prote&iacute;nas de fase aguda de origen hep&aacute;tico, la prote&iacute;na C reactiva, el amiloide A, el fibrin&oacute;geno y el inhibidor de la activaci&oacute;n de plasmin&oacute;geno, tambi&eacute;n se han vinculado con el desarrollo de procesos inflamatorios<sup>10</sup>.</font></p>     <p><font face="Verdana" size="2">Actualmente otros biomarcadores est&aacute;n adquiriendo inter&eacute;s entre ellos el &aacute;cido si&aacute;lico, marcadores de disfunci&oacute;n endotelial, factor 3 del complemento, IL-18, la haptoglobina, la ceruloplasmina, la visfatina, la apelina, glicoprote&iacute;na zinc-alfa 2, eotaxina, vaspina y la omentina, entre otros<sup>11-13</sup> (<a target="_blank" href="/img/revistas/nh/v22n5/revision_t1.gif">tablas I</a>-<a target="_blank" href="/img/revistas/nh/v22n5/revision_t2.gif">II</a> y <a target="_blank" href="/img/revistas/nh/v22n5/revision_t3.gif">III</a>).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Biomarcadores del estado inflamatorio y patolog&iacute;as asociadas</b></font></p>     <p><font face="Verdana" size="2"><i>Factor de necrosis tumoral alfa (TNF-alfa)</i></font></p>     <p><font face="Verdana" size="2">El TNF-alfa es una de las principales citoquinas mediadoras en la respuesta inflamatoria e inmune<sup>9</sup>. Este mediador de la inflamaci&oacute;n est&aacute; elevado en la obesidad, habi&eacute;ndose demostrado una asociaci&oacute;n positiva del TNF-alfa s&eacute;rico con el &iacute;ndice de masa corporal (IMC). Igualmente, los niveles de TNF-alfa aumentaron en pacientes obesos con s&iacute;ndrome metab&oacute;lico, en comparaci&oacute;n con pacientes obesos sin s&iacute;ndrome metab&oacute;lico<sup>14</sup>. Este estudio revel&oacute;, aparentemente por primera vez, que los niveles de TNF-alfa se elevan con el n&uacute;mero de componentes del s&iacute;ndrome metab&oacute;lico presentes. Adem&aacute;s, el an&aacute;lisis estad&iacute;stico mostr&oacute; una correlaci&oacute;n positiva del TNF-alfa con medidas de adiposidad como la circunferencia de la cintura, con la trigliceridemia, insulinemia y con la resistencia insulin&iacute;ca medida a trav&eacute;s del &iacute;ndice HOMA-IR. Por el contrario, la correlaci&oacute;n fue negativa con los niveles de colesterol-HDL<sup>14</sup>. Sin embargo, en este mismo estudio los niveles de TNF-alfa no se vieron modificados significativamente tras cuatro o seis semanas de tratamiento con dieta hipocal&oacute;rica. No obstante, otros autores han encontrado una tendencia a su disminuci&oacute;n en sujetos obesos con insulino resistencia, tras modificar el estilo de vida a base de dieta hipocal&oacute;rica y ejercicio moderado<sup>15</sup>.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n al metabolismo de la glucosa, se ha publicado que el TNF-alfa est&aacute; sobreexpresado en tejido adiposo blanco, en estados de obesidad y resistencia insul&iacute;nica<sup>16</sup>. En este sentido, se ha demostrado que la dieta y el tratamiento farmacol&oacute;gico indicados en la mejora a la sensibilidad insul&iacute;nica, conducen a una disminuci&oacute;n en los niveles s&eacute;ricos de TNF-alfa con p&eacute;rdida de peso<sup>17</sup>. Adem&aacute;s de su implicaci&oacute;n en la obesidad y resistencia insul&iacute;nica, el TNF-alfa se ha asociado con patolog&iacute;as como la hipertensi&oacute;n arterial, las dislipemias, infecciones y c&aacute;ncer<sup>18</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Interleuquina 6 (IL-6)</i></font></p>     <p><font face="Verdana" size="2">La IL-6 junto con el TNF-alfa son las dos citoquinas mejor estudiadas en relaci&oacute;n con la obesidad<sup>9</sup>. Los niveles de IL-6 se han encontrado elevados en sujetos obesos, tanto en suero como en tejido adiposo blanco. Los adipocitos contribuyen al 30% de los niveles circulantes de IL-6, siendo la aportaci&oacute;n m&aacute;s alta en la grasa visceral que en la grasa subcut&aacute;nea<sup>9</sup>. Investigaciones llevadas a cabo en humanos muestran que los niveles de IL-6 aparecen elevados en el sobrepeso-obesidad y se correlacionan con medidas de adiposidad como la circunferencia de la cintura, el &iacute;ndice cintura/cadera y el IMC<sup>19</sup>. Sin embargo, los niveles descienden en sujetos obesos que participan en estudios de intervenci&oacute;n basados en dieta y ejercicio<sup>20</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La asociaci&oacute;n entre medidas de sensibilidad a la insulina, diabetes tipo 2 y niveles de IL-6<sup>21</sup> indicada por algunos autores, establece que niveles elevados de IL-6 pueden predecir el desarrollo de diabetes mellitus tipo 2 en algunos casos<sup>22</sup>. La presencia de diabetes tipo 2 en humanos se ha relacionado con polimorfismos en el promotor del gen de la IL-6<sup>23</sup>. Sin embargo, el papel de la IL-6 en la resistencia insul&iacute;nica ha sido cuestionado, ya que algunos autores no han encontrado modificaciones en el metabolismo gluc&iacute;dico tras la administraci&oacute;n aguda de IL-6, sugiriendo que la IL-6 <i>per se</i> es improbable que est&eacute; vinculada al desarrollo de la resistencia insul&iacute;nica en humanos<sup>24</sup>.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n, se han postulado que la IL-6 podr&iacute;a ser el nexo de uni&oacute;n entre inflamaci&oacute;n, obesidad, estr&eacute;s y enfermedad cardiovascular<sup>25</sup>, proponiendo el papel de la IL-6 en la patog&eacute;nesis de los trastornos coronarios<sup>26</sup>. Por otra parte, la IL-6 es un potente inductor de la respuesta de fase aguda hep&aacute;tica, estimulando la producci&oacute;n de un gran n&uacute;mero de prote&iacute;nas como son el fibrin&oacute;geno, la prote&iacute;na C reactiva, la haptoglobina y la prote&iacute;na s&eacute;rica del amiloide A, con las implicaciones que todas ellas tienen en los procesos inflamatorios<sup>6</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Angiotensin&oacute;geno (AGT)</i></font></p>     <p><font face="Verdana" size="2">La producci&oacute;n de AGT en respuesta a la inflamaci&oacute;n o al estado de shock, es el motivo por lo que se reconoce como una prote&iacute;na de fase aguda6. El AGT forma parte del primer eslab&oacute;n en la activaci&oacute;n del sistema renina-angiotensina<sup>18</sup>. La principal caracter&iacute;stica de este sistema es la regulaci&oacute;n de la presi&oacute;n sangu&iacute;nea y el shock hipovol&eacute;mico.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n con la obesidad, se ha observado una sobreexpresi&oacute;n de AGT en tejido adiposo visceral, mostrando una correlaci&oacute;n positiva con el IMC. Tambi&eacute;n, se ha hallado una correlaci&oacute;n directa entre los niveles plasm&aacute;ticos de AGT y los niveles de leptina y el IMC<sup>27</sup>. Al igual que el TNF-alfa, el AGT se asocia con efectos negativos sobre la hipertensi&oacute;n, diabetes, dislipemia, infecciones y c&aacute;ncer<sup>18</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Factor de crecimiento TGF-beta</i></font></p>     <p><font face="Verdana" size="2">EL TGF-beta -en ingl&eacute;s "Transforming Growth Factor"- es una citoquina multifuncional producida por una variedad de c&eacute;lulas, entre ellas los adipocitos, que es capaz de regular el crecimiento y la diferenciaci&oacute;n de numerosos tipos celulares<sup>28</sup>. Los niveles de TGF-beta1 podr&iacute;an explicar parte de la conexi&oacute;n molecular que existe entre trastornos tales como la hipertensi&oacute;n, la diabetes, la obesidad, el tabaquismo y alteraciones asociadas a fibrosis<sup>29</sup>.</font></p>     <p><font face="Verdana" size="2">Adem&aacute;s de sus propios efectos, el TGF-beta guarda relaci&oacute;n con otros biomarcadores del estado inflamatorio, mostrando ser un agente inductor de la s&iacute;ntesis de PAI-1 en tejido adiposo humano, y a su vez, el TNFalfa un potente inductor de TGF-beta1 en tejido adiposo<sup>30</sup>. As&iacute;, se ha propuesto que el TGF-beta1 es de especial relevancia en la elevaci&oacute;n de la expresi&oacute;n de PAI-1 encontrada en sujetos con obesidad m&oacute;rbida asociada a resistencia insul&iacute;nica<sup>31</sup>. Por otro lado, se ha observado que con la p&eacute;rdida de peso, los niveles de TGF-beta descienden significativamente<sup>32</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Inhibidor de la activaci&oacute;n de plasmin&oacute;geno (PAI-1)</i></font></p>     <p><font face="Verdana" size="2">El PAI-1 es un factor protromb&oacute;tico secretado entre otras c&eacute;lulas por los adipocitos<sup>5</sup>. La relaci&oacute;n entre PAI-1 y trastornos cardiovasculares est&aacute; firmemente establecida, pero tambi&eacute;n se ha vinculado a otras patolog&iacute;as. As&iacute;, diversas investigaciones llevadas a cabo en humanos muestran que el PAI-1 est&aacute; aumentado en situaciones de obesidad, diabetes mellitus tipo 2 y estados proinflamatorios<sup>5, 31</sup>. Un estudio reciente propone que la medida de PAI-1 podr&iacute;a ser un predictor &uacute;til de diabetes tipo 2, independientemente de s&iacute;ndrome metab&oacute;lico, permitiendo identificar individuos con riesgo de diabetes<sup>33</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La s&iacute;ntesis de PAI-1 es inducible y se ha especulado que la obesidad y la resistencia insul&iacute;nica representan una situaci&oacute;n favorable para la expresi&oacute;n de inductores de su s&iacute;ntesis, entre ellos la insulina, el TNF-alfa y el TGF-beta<sup>28, 30, 31</sup>. La expresi&oacute;n de PAI-1 y TGF-beta1, as&iacute; como el BMI, est&aacute;n estrechamente relacionados en tejido adiposo de sujetos con obesidad m&oacute;rbida<sup>31</sup>. Recientemente, se ha publicado que es un componente del s&iacute;ndrome metab&oacute;lico, estando los niveles significativamente aumentados en estos sujetos<sup>34</sup>. Por el contrario, los niveles de PAI-1 descienden significativamente cuando hay p&eacute;rdida de peso<sup>32</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Interleuquina 18 (IL-18)</i></font></p>     <p><font face="Verdana" size="2">La IL-18 es una citoquina proinflamatoria secretada por adipocitos humanos con propiedades aterog&eacute;nicas a trav&eacute;s de efectos sobre la IL-6, TNF-alfa y el interfer&oacute;n-gamma, que se ha propuesto como un mediador clave en la inflamaci&oacute;n subcl&iacute;nica asociada con obesidad abdominal y, en particular, como un nexo de uni&oacute;n entre la obesidad y complicaciones asociadas, principalmente las ECV, la intolerancia a la glucosa y la diabetes tipo 2<sup>35</sup>.</font></p>     <p><font face="Verdana" size="2">Los niveles de IL-18 se han encontrado elevados en mujeres obesas, mostrando una asociaci&oacute;n positiva con el peso corporal y con el dep&oacute;sito de grasa abdominal, reduciendo sus niveles tras un a&ntilde;o de intervenci&oacute;n con dieta hipocal&oacute;rica<sup>36</sup>. En relaci&oacute;n a la glucemia, una situaci&oacute;n aguda de hiperglucemia provoca un aumento en los niveles de IL-18 en humanos, mediado por el estr&eacute;s oxidativo36. Igualmente, la diabetes tipo 2 se asocia con niveles m&aacute;s elevados de esta citoquina<sup>37</sup>.</font></p>     <p><font face="Verdana" size="2">La IL-18 tambi&eacute;n se ha relacionado positivamente con criterios cl&iacute;nicos de s&iacute;ndrome metab&oacute;lico como IMC, circunferencia de la cintura, glucosa en ayuno y niveles de insulina y negativamente con los niveles de colesterol-HDL en sujetos obesos<sup>38</sup>. En este sentido, la IL-18 se ha involucrado en la patog&eacute;nesis del s&iacute;ndrome metab&oacute;lico<sup>38</sup>.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n con otras citoquinas, se ha publicado que en humanos el TNF-alfa induce la expresi&oacute;n de IL-18 en tejido muscular y no en tejido adiposo, mientras que la IL-6 no afecta a la expresi&oacute;n en ninguno de los dos tejidos estudiados24. Los niveles de IL-18 se han correlacionado con los de prote&iacute;na C reactiva (PCR), una prote&iacute;na de fase aguda de producci&oacute;n hep&aacute;tica, en pacientes con diabetes tipo 2<sup>37</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Leptina</i></font></p>     <p><font face="Verdana" size="2">La leptina es una hormona sintetizada mayoritariamente en tejido adiposo, que cruza la barrera hematoencef&aacute;lica hacia el hipot&aacute;lamo estimulando neuronas anorex&iacute;genas y glucosensitivas y reduciendo la sensaci&oacute;n de apetito<sup>39</sup>. Adem&aacute;s, la leptina incrementa el gasto energ&eacute;tico, por lo que disminuye la eficiencia metab&oacute;lica y su expresi&oacute;n g&eacute;nica est&aacute; regulada entre otros factores por la ingesta y por la insulina, la cual estimula la secreci&oacute;n de leptina en periodos de sobrealimentaci&oacute;n<sup>39</sup>.</font></p>     <p><font face="Verdana" size="2">Los niveles circulantes de leptina se encuentran aumentados en sujetos obesos y son proporcionales a la masa grasa corporal, siendo considerada como una se&ntilde;al de reserva energ&eacute;tica de nuestro organismo que se asocia a una situaci&oacute;n de resistencia a la misma<sup>40</sup>. Por el contrario, sus niveles disminuyen en sujetos con anorexia nerviosa, demostrando que la regulaci&oacute;n fisiol&oacute;gica de la leptina se mantiene en relaci&oacute;n al estado nutricional, incluso en situaci&oacute;n extrema de p&eacute;rdida de peso y grasa corporal<sup>41</sup>. El ayuno y la malnutrici&oacute;n son dos situaciones asociadas a bajos niveles circulantes de leptina<sup>42</sup>. Tambi&eacute;n, se ha sugerido que la p&eacute;rdida de peso presente en determinadas condiciones patol&oacute;gicas se debe al aumento encontrado en los niveles de leptina<sup>43</sup>.</font></p>     <p><font face="Verdana" size="2">Actualmente se sabe que adem&aacute;s de sus efectos centrales est&aacute; implicada, <i> per se</i> o por sinergismo con otras citoquinas en la patog&eacute;nesis de la inflamaci&oacute;n y de trastornos autoinmunes<sup>40</sup>. La leptina y su receptor muestran similitud estructural y funcional con la IL-6<sup>42</sup>. Aunque varios estudios han indicado que el tratamiento con TNF-alfa incrementa los niveles de leptina en humanos<sup>44</sup>, otros no han encontrado correlaci&oacute;n estad&iacute;sticamente significativa<sup>45</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Tambi&eacute;n se ha publicado un aumento en su s&iacute;ntesis en respuesta a la infecci&oacute;n aguda, sepsis y secreci&oacute;n de mediadores de la inflamaci&oacute;n como IL-1<sup>46</sup>. Varios estudios han implicado a la leptina en la patog&eacute;nesis de trastornos inflamatorios autoinmunes como la diabetes tipo 1, artritis reumatoide, osteoartritis e inflamaci&oacute;n intestinal<sup>42</sup>.</font></p>     <p><font face="Verdana" size="2">As&iacute;, desde su descubrimiento no s&oacute;lo se cita su papel en la regulaci&oacute;n del peso corporal, la leptina es un nexo de uni&oacute;n entre el sistema neuroendocrino y autoinmune, regula el eje hipotal&aacute;mico-pituitario-adrenal, maduraci&oacute;n del sistema reproductivo, hematopoyesis, angiog&eacute;nesis y el desarrollo fetal<sup>42</sup>.</font></p>     <p><font face="Verdana" size="2">Por otra parte, la p&eacute;rdida de peso reduce los niveles circulantes de leptina y al mismo tiempo en esta situaci&oacute;n son m&aacute;s bajos los niveles de marcadores de la inflamaci&oacute;n asociados a obesidad<sup>47</sup>. Sin embargo, la administraci&oacute;n de leptina ex&oacute;gena durante la p&eacute;rdida de peso en poblaci&oacute;n obesa no valid&oacute; la hip&oacute;tesis del papel proinflamatorio de la leptina en la obesidad humana<sup>17</sup>. As&iacute;, se necesitan nuevas investigaciones acerca del papel de la leptina act&uacute;ando como adipoquina proinflamatoria.</font></p>     <p><font face="Verdana" size="2"><i>Resistina</i></font></p>     <p><font face="Verdana" size="2">La resistina es una hormona secretada por los adipocitos que pertenece a una familia de prote&iacute;nas rica en cisteina<sup>48</sup>. Inicialmente se demostr&oacute; su presencia en adipocitos de rat&oacute;n, aumentando su secreci&oacute;n en ratones obesos con resistencia a la insulina, aunque las expectativas generales no han podido cumplirse totalmente repecto a su vinculaci&oacute;n insulina mecan&iacute;stica. As&iacute;, se postul&oacute; que la resistina era el nexo de uni&oacute;n entre la obesidad y la resistencia insul&iacute;nica<sup>49</sup>. Actualmente, se ha propuesto que la resistina es una citoquina proinflamatoria<sup>50</sup>. As&iacute;, la resistina al igual que otras adipoquinas podr&iacute;a contribuir a los trastornos metab&oacute;licos directamente o a trav&eacute;s de los procesos inflamatorios<sup>51</sup>.</font></p>     <p><font face="Verdana" size="2">Sin embargo, los resultados en humanos son contradictorios y varias cuestiones permanecen todav&iacute;a sin aclarar en esta &aacute;rea de investigaci&oacute;n<sup>48</sup>. En este sentido, se ha indicado en algunos trabajos que la resistina no est&aacute; asociada con obesidad o con la resistencia a insulina en humanos, as&iacute; no se observa disminuci&oacute;n en los niveles s&eacute;ricos de resistina a pesar de la disminuci&oacute;n en el peso y la mejora en la sensibilidad insul&iacute;nica encontrada en sujetos con obesidad m&oacute;rbida y s&iacute;ndrome metab&oacute;lico<sup>52</sup>. Tampoco se obtuvo asociaci&oacute;n entre la resistina y medidas de adiposidad, o de resistencia insul&iacute;nica, ni con la glucosa plasm&aacute;tica en ayunas ni con la mayor&iacute;a de par&aacute;metros del perfil lip&iacute;dico analizados, salvo negativamente con los niveles de colesterol-HDL<sup>53</sup>. En otro estudio, los niveles de resistina se asociaron con la obesidad, pero no con la resistencia insul&iacute;nica<sup>54</sup>. Igualmente, otros autores indican que la resistina no puede ser considerada como mediador importante en la resistencia insul&iacute;nica o el s&iacute;ndrome metab&oacute;lico en humanos<sup>55</sup>. Sin embargo, recientemente se ha publicado que los niveles de resistina se correlacionan con determinantes de s&iacute;ndrome metab&oacute;lico<sup>56</sup>.</font></p>     <p><font face="Verdana" size="2">Respecto a la inflamaci&oacute;n, los niveles de resistina se han correlacionado con marcadores como el TNF-alfa, la IL-6 y la PCR, en sujetos con trastorno inflamatorio severo, presentando los niveles de resistina m&aacute;s elevados<sup>57</sup>. Sin embargo, no se obtuvo asociaci&oacute;n entre resistina y estos marcadores en diabetes tipo 2 y tampoco los niveles de resistina estuvieron elevados en estos pacientes<sup>57</sup>. Otros autores han encontrado asociaci&oacute;n con marcadores de la inflamaci&oacute;n en sujetos con diabetes tipo 2<sup>58</sup>.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n, la resistina se ha relacionado con procesos inflamatorios como la aterosclerosis y artritis<sup>50</sup>. Varios estudios han propuesto a esta hormona como un factor de riesgo cardiovascular y potencial responsable en la disfunci&oacute;n endotelial y de lesiones ateroscler&oacute;ticas. As&iacute;, se ha sugerido su papel en la inflamaci&oacute;n vascular, dado que puede inducir la expresi&oacute;n de mol&eacute;culas de adhesi&oacute;n tales como VCAM-I y ICAM-I sobre c&eacute;lulas endoteliales vasculares, efecto que puede ser inhibido por adiponectina. Tambi&eacute;n se ha se&ntilde;alado<sup>51</sup> que la resistina estimula la s&iacute;ntesis y secreci&oacute;n de otras citoquinas proinflamatorias como el TNF-alfa, la IL-12, la IL-6 a trav&eacute;s del factor nuclear KB (NF-kB). La inducci&oacute;n de citoquinas puede contribuir a la resistencia insul&iacute;nica, obesidad y otras complicaciones asociadas<sup>5</sup>.</font></p>     <p><font face="Verdana" size="2">Al d&iacute;a de hoy, m&aacute;s informaci&oacute;n de la que se dispone se requiere para aclarar el posible papel de la resistina en la patog&eacute;nesis de la obesidad y de la diabetes tipo 2 y comprobar la hip&oacute;tesis postulada por algunos autores de que la resistina es liberada en respuesta a una inflamaci&oacute;n cr&oacute;nica de bajo grado y tiene propiedades antioxidantes<sup>59</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Prote&iacute;na C reactiva (PCR)</i></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Esta prote&iacute;na de fase aguda es producida en el h&iacute;gado, cuya elevaci&oacute;n est&aacute; mediada por citoquinas producidas en el tejido adiposo<sup>60</sup>. En relaci&oacute;n con la obesidad y complicaciones asociadas, se ha observado la presencia de una inflamaci&oacute;n sist&eacute;mica de bajo grado en pacientes con obesidad, diabetes tipo 2 y enfermedades cardiovasculares (ECV), caracterizado por altos niveles en suero de PCR, entre otros biomarcadores<sup>61</sup>. As&iacute;, la PCR se considera un factor de riesgo cardiovascular independiente y se ha asociado positivamente con el peso, con el IMC, con otras medidas de adiposidad y con la resistencia insul&iacute;nica<sup>61, 62</sup>.</font></p>     <p><font face="Verdana" size="2">Sin embargo, el ejercicio f&iacute;sico y la p&eacute;rdida de peso provocan una disminuci&oacute;n importante tanto en el peso total y grasa corporal como en los niveles de PCR<sup>20</sup>. En otro estudio, la disminuci&oacute;n encontrada en los niveles de PCR tras dieta y ejercicio se asoci&oacute; con cambios favorables en la adiposidad abdominal y en el metabolismo lip&iacute;dico, reflejado en los niveles de trigliceridemia y &aacute;cidos grasos libres<sup>60</sup>. De este modo, el descenso en los niveles de PCR originado por el estilo de vida m&aacute;s saludable podr&iacute;a explicar en parte estos efectos cardiosaludables<sup>62</sup>.</font></p>     <p><font face="Verdana" size="2">En un estudio reciente, la adiposidad se ha relacionado estrechamente con bajo grado de inflamaci&oacute;n sist&eacute;mica en hombres y mujeres, pero la asociaci&oacute;n ha sido m&aacute;s importante en mujeres, especialmente para la PCR, concluyendo que la reducci&oacute;n de peso como medida de prevenci&oacute;n de un estado de inflamaci&oacute;n subcl&iacute;nico podr&iacute;a ser particularmente efectiva en el sexo femenino<sup>19</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Amiloide A (SAA)</i></font></p>     <p><font face="Verdana" size="2">El SAA forma parte de una familia de apolipoprote&iacute;nas, que hasta el momento se pensaba que estaban expresadas s&oacute;lo en hepatocitos, pero que ahora se conoce que tambi&eacute;n se secretan en tejido adiposo de humanos y cuya producci&oacute;n est&aacute; regulada por factores nutricionales<sup>63</sup>. El SAA junto con la PCR son las principales prote&iacute;nas producidas en el h&iacute;gado en respuesta a la inflamaci&oacute;n, elevando su concentraci&oacute;n en plasma r&aacute;pidamente en una forma similar desde 100 a 1.000 veces al cabo de 1-2 d&iacute;as del inicio de la inflamaci&oacute;n<sup>64</sup>. Adem&aacute;s se sugiere que podr&iacute;an contribuir a las complicaciones sist&eacute;micas de la obesidad. En este sentido, se ha demostrado que existe una asociaci&oacute;n positiva entre los niveles de SAA y medidas de adiposidad como el IMC, el &iacute;ndice cintura/cadera, los niveles de PCR y los niveles de leptina<sup>19</sup>.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n al metabolismo lip&iacute;dico, en condiciones inflamatorias, como por ejemplo traumatismos, sepsis y artritis reumatoide, se ha comprobado que el SAA podr&iacute;a ser responsable de la disminuci&oacute;n de los niveles de colesterol-HDL<sup>65</sup>. Este efecto podr&iacute;a explicar los bajos niveles de colesterol-HDL observados en la obesidad y aclarar su significaci&oacute;n en el proceso de ateroesclerosis<sup>66</sup>. Recientemente se ha postulado que la PCR y el SAA contribuyen al r&aacute;pido reciclaje del colesterol y de los fosfol&iacute;pidos para la s&iacute;ntesis de membranas de millones de nuevas c&eacute;lulas que se necesitan en la fase aguda de la inflamaci&oacute;n y en el proceso de reparaci&oacute;n<sup>64</sup>.</font></p>     <p><font face="Verdana" size="2"><i>&Aacute;cido si&aacute;lico (AS)</i></font></p>     <p><font face="Verdana" size="2">El an&aacute;lisis de los niveles de &aacute;cido si&aacute;lico o &aacute;cido Nactilneuram&iacute;nico (AS) en suero se ha propuesto como una medida &uacute;til para determinar el estado inflamatorio de un individuo, encontrando su aplicaci&oacute;n en estudios epidemiol&oacute;gicos a gran escala<sup>67</sup>.</font></p>     <p><font face="Verdana" size="2">El AS, tiene menor variabilidad intraindividual en el tiempo que otros marcadores potenciales de inflamaci&oacute;n, proporcionando informaci&oacute;n m&aacute;s significativa de un estado inflamatorio habitual<sup>67</sup>. Adem&aacute;s de ser el marcador m&aacute;s estable, puede tambi&eacute;n ser un indicador&uacute;til de la respuesta total de fase aguda<sup>67</sup>.</font></p>     <p><font face="Verdana" size="2">Los niveles de &aacute;cido si&aacute;lico, como la PCR, est&aacute;n asociados positivamente con el peso, el IMC, el &iacute;ndice HOMA-IR, la dislipidemia y la hipertensi&oacute;n; pero mientras que el &aacute;cido si&aacute;lico muestra una asociaci&oacute;n significativa e independiente del IMC, no ocurre lo mismo con la PCR<sup>67</sup>. Adem&aacute;s, el AS act&uacute;a como un marcador integrado de un n&uacute;mero de prote&iacute;nas de fase aguda y es representativo de la respuesta total, mientras que la PCR es simplemente una de las diversas prote&iacute;nas de fase aguda, que pueden ser liberadas por el h&iacute;gado como parte del proceso inflamatorio<sup>68</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Tambi&eacute;n son importantes las diferencias entre la PCR y el AS con relaci&oacute;n a los signos cl&iacute;nicos individuales del s&iacute;ndrome metab&oacute;lico. As&iacute;, por ejemplo, el AS muestra una relaci&oacute;n m&aacute;s importante con los factores relacionados con la hipertensi&oacute;n y la dislipemia que la PCR. As&iacute;, estos autores concluyen que la PCR puede no reflejar la verdadera interrelaci&oacute;n entre la inflamaci&oacute;n y el riesgo metab&oacute;lico, mientras que el &aacute;cido si&aacute;lico, un marcador m&aacute;s estable y m&aacute;s representativo de toda la respuesta de fase aguda, puede ser m&aacute;s apropiado para estudiar las enfermedades relacionadas con la obesidad<sup>67</sup>.</font></p>     <p><font face="Verdana" size="2">Adem&aacute;s, el &aacute;cido si&aacute;lico se considera un factor de riesgo cardiovascular y de diabetes tipo 2<sup>69</sup>. As&iacute;, se han descrito niveles elevados de &aacute;cido si&aacute;lico en sujetos con dislipidemia, resistencia insul&iacute;nica, diabetes mellitus y enfermedades coronarias<sup>70</sup>. Tambi&eacute;n, se ha propuesto que la resistencia insul&iacute;nica pudiese ser el resultado de un aumento en los niveles de &aacute;cido si&aacute;lico en suero69. En otro estudio se concluy&oacute; que la medida de&aacute;cido si&aacute;lico como un marcador de inflamaci&oacute;n podr&iacute;a ser valorado como un par&aacute;metro independiente en la identificaci&oacute;n de sujetos con alto riesgo de desarrollar diabetes mellitus tipo 2 y, en estos casos, se podr&iacute;an beneficiar con un tratamiento antiinflamatorio<sup>71</sup>.</font></p>     <p><font face="Verdana" size="2">Adem&aacute;s, se ha observado una correlaci&oacute;n significativa entre los niveles s&eacute;ricos de &aacute;cido si&aacute;lico y los niveles de leptina, sugiriendo de este modo, que niveles elevados de &aacute;cido si&aacute;lico est&aacute;n relacionados con los marcadores de la obesidad y del metabolismo del tejido adiposo, lo que podr&iacute;a ayudar a explicar su papel como posible indicador de riesgo cardiovascular y justificar el hecho de que elevadas concentraciones de &aacute;cido si&aacute;lico preceden al desarrollo de la diabetes mellitus tipo 2, en determinadas circunstancias<sup>69</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Fibrin&oacute;geno</i></font></p>     <p><font face="Verdana" size="2">El fibrin&oacute;geno, al igual que la PCR y el SAA, es una prote&iacute;na reactante de fase aguda de origen hep&aacute;tico, cuya producci&oacute;n est&aacute; controlada por la IL-6, aparentemente<sup>72</sup>. Estando bien establecido que el fibrin&oacute;geno es un factor muy importante de riesgo cardiovascular<sup>73</sup>. Dado que la obesidad est&aacute; asociada a aterosclerosis, varias investigaciones se han encaminado al estudio de posibles asociaciones entre el fibrin&oacute;geno y la obesidad. Los niveles de fibrin&oacute;geno se han correlacionado de forma positiva con medidas de adiposidad tales como el IMC, la circunferencia de la cintura, el &iacute;ndice cintura-cadera y el porcentaje de grasa corporal<sup>19</sup>. Por otra parte, los niveles de fibrin&oacute;geno se han visto disminuidos con la p&eacute;rdida de peso<sup>74</sup>. Tambi&eacute;n se ha observado que niveles elevados de fibrin&oacute;geno predisponen a los pacientes obesos a un mayor riesgo de sufrir complicaciones tromboemb&oacute;licas<sup>32</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Marcadores de disfunci&oacute;n endotelial</i></font></p>     <p><font face="Verdana" size="2">En la obesidad est&aacute; presente un bajo grado de inflamaci&oacute;n y, dado que la inflamaci&oacute;n contribuye a disfunci&oacute;n endotelial, son varias las investigaciones que estudian la influencia de marcadores de disfunci&oacute;n endotelial en la obesidad y patolog&iacute;as asociadas<sup>75</sup>. La disfunci&oacute;n endotelial y la inflamaci&oacute;n podr&iacute;an mediar la relaci&oacute;n entre obesidad central, resistencia insul&iacute;nica e incidencia de diabetes presente en mujeres obesas<sup>76</sup>.</font></p>     <p><font face="Verdana" size="2">Algunos marcadores de disfunci&oacute;n endotelial y predictores de aterosclerosis como el factor von Willebrand (FvW) y el <i>PAI-1</i>, son tambi&eacute;n predictores independientes de diabetes y riesgos asociados a diabetes<sup>77</sup>. Varios estudios han publicado una elevaci&oacute;n en los niveles de FvW en sujetos obesos<sup>61, 75</sup>, encontrando una asociaci&oacute;n con los niveles de TNF-alfa en plasma<sup>78</sup>. La resistencia insul&iacute;nica y la diabetes tipo 2 guardan relaci&oacute;n con la activaci&oacute;n endotelial<sup>79</sup>. As&iacute;, una correlaci&oacute;n positiva entre el FvW y el &iacute;ndice HOMA-IR se obtuvo en ni&ntilde;os obesos y adolescentes despu&eacute;s de ajustar los datos para la edad, sexo, IMC y la masa corporal<sup>61</sup>. Tambi&eacute;n, la obesidad y la resistencia insul&iacute;nica se han asociado con niveles elevados de otros biomarcadores de disfunci&oacute;n endotelial tales como las mol&eacute;culas solubles de adhesi&oacute;n (<i>sCAM</i>) y las selectinas<sup>61, 75, 79</sup>.</font></p>     <p><font face="Verdana" size="2">La mol&eacute;cula de adhesi&oacute;n intracelular soluble de tipo 1 (sICAM-1) es un residuo pept&iacute;dico glicosilado que comprende una parte extracelular de la ICAM-1, miembro de la superfamilia de inmunoglobulinas con un papel cr&iacute;tico en muchos procesos inflamatorios<sup>80</sup>. La expresi&oacute;n de CAM's est&aacute; regulada por el factor de transcripci&oacute;n NF-kB, cuya liberaci&oacute;n es inducida por varios mediadores de la inflamaci&oacute;n como IL-1, TNFalfa y angiotensina<sup>81</sup>. Una elevaci&oacute;n de los niveles de sICAM-1 es frecuente en distintas situaciones patol&oacute;gicas relacionadas con la inflamaci&oacute;n, incluyendo obesidad, diabetes tipo 2 y trastornos cardiovasculares<sup>82</sup>. As&iacute;, sICAM-1 se ha correlacionado positivamente con obesidad central<sup>83</sup> y trigliceridemia e inversamente con los niveles de colesterol-HDL<sup>84</sup>. La elevaci&oacute;n en sujetos obesos podr&iacute;a ser debida a un aumento en la expresi&oacute;n de esta prote&iacute;na por los adipocitos<sup>82</sup>. Otros autores relacionan los niveles elevados de sICAM-1 en la obesidad con el TNF-alfa y la resistencia insul&iacute;nica<sup>85</sup>.</font></p>     <p><font face="Verdana" size="2">Una investigaci&oacute;n reciente cuyo objetivo ha consistido en estudiar la asociaci&oacute;n entre medidas convencionales de obesidad y s&iacute;ndrome metab&oacute;lico con cuatro diferentes mol&eacute;culas de adhesi&oacute;n celular (selectina-sP, selectina-sE, sICAM-1, sVCAM-1) en hombres y mujeres de diferente origen &eacute;tnico, ha concluido que la asociaci&oacute;n depende del tipo de mol&eacute;cula de adhesi&oacute;n y que la relaci&oacute;n m&aacute;s fuerte se encontr&oacute; entre la sE-selectina y el &iacute;ndice cintura/cadera<sup>86</sup>. Estos autores postulan que niveles de selectina-sE un 2% m&aacute;s altos aproximadamente, estar&iacute;an asociados con 1 unidad m&aacute;s de IMC y con 0,01 unidades m&aacute;s de &iacute;ndice cintura/cadera<sup>86</sup>. En esta misma l&iacute;nea, la selectina-E mostr&oacute; una correlaci&oacute;n positiva con el IMC, colesterol y triglic&eacute;ridos en ni&ntilde;os y adolescentes con obesidad, hipertensi&oacute;n y diabetes<sup>87</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En una revisi&oacute;n acerca de la influencia del estilo de vida sobre estos marcadores, concretamente la pr&aacute;ctica del ejercicio f&iacute;sico, el tabaquismo, la ingesta de alcohol y el efecto de distintos nutrientes sobre sICAM-1<sup>81</sup>, se ha concluido que la determinaci&oacute;n de la concentraci&oacute;n de sICAM-1 podr&iacute;a ser de utilidad para comprobar la eficacia de la intervenci&oacute;n diet&eacute;tica y la pr&aacute;ctica de ejercico f&iacute;sico en el tratamiento de la aterosclerosis, una complicaci&oacute;n asociada a la obesidad, aunque nuevas investigaci&oacute;nes al respecto son necesarias. El patr&oacute;n de dieta mediterr&aacute;nea tambi&eacute;n se ha asociado de forma inversa con los niveles s&eacute;ricos de TNF-alfa y de VCAM-1<sup>88</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Factor 3 del complemento y la prote&iacute;na estimuladora de la acilaci&oacute;n (ASP)</i></font></p>     <p><font face="Verdana" size="2">El sistema del complemento es esencial en los mecanismos de inmunidad innata<sup>89</sup>. El tercer componente del complemento (C3) es una prote&iacute;na reactante de fase aguda de producci&oacute;n hep&aacute;tica, adem&aacute;s de ser una citoquina que puede ser secretada por adipocitos y macr&oacute;fagos activados por inflamaci&oacute;n<sup>89</sup>. El C3 juega un papel central, ya que participa en las tres v&iacute;as de activaci&oacute;n del complemento: cl&aacute;sica, alternativa y v&iacute;a de la lectina<sup>90</sup>. As&iacute;, una elevaci&oacute;n de la concentraci&oacute;n de C3 se ha asociado, entre otros factores, con la ECV<sup>91</sup>, el &iacute;ndice HOMA-IR, la ganancia de peso<sup>6,92</sup>, la circunferencia de la cintura y con niveles elevados de triglic&eacute;ridos en ayunas y en situaci&oacute;n postpandrial, proponi&eacute;ndolo como un factor de riesgo coronario<sup>93</sup>, de desarrollo de diabetes<sup>94</sup>, de obesidad<sup>92</sup> as&iacute; como un marcador &uacute;til para la identificaci&oacute;n de sujetos con el s&iacute;ndrome metab&oacute;lico<sup>95</sup>.</font></p>     <p><font face="Verdana" size="2">La ASP es una de las hormonas producidas por los adipocitos como resultado de la interacci&oacute;n de los factores del complemento C3, factor B y adipsina (factor D), dando lugar a la formaci&oacute;n de un derivado de C3, C3adesArg, denominado ASP. Al igual que C3, los niveles de ASP aumentan en situaci&oacute;n de obesidad, diabetes y ECV<sup>96</sup>.</font></p>     <p><font face="Verdana" size="2">La ASP incrementa la eficiencia de la s&iacute;ntesis de triglic&eacute;ridos en los adipocitos v&iacute;a acciones paracrinas/autocrinas, estimula la absorci&oacute;n de glucosa, activa la diacilglicerol acil transferasa (DGAT) e inhibe la actividad de la lipasa sensible a hormonas<sup>97</sup>. El resultado de la acci&oacute;n de la ASP es un r&aacute;pido aclaramiento lip&iacute;dico postprandrial<sup>98</sup>. Por ello, el sistema C3/ASP ha sido propuesto como un regulador del metabolismo de los &aacute;cidos grasos en tejido adiposo.</font></p>     <p><font face="Verdana" size="2">En este sentido, los ratones gen&eacute;ticamente deficientes en C3 y, por tanto, incapaces de sintetizar ASP presentaron hiperfagia con reducci&oacute;n en el peso corporal, en la masa grasa y en los niveles de leptina, as&iacute; como un aumento en el gasto energ&eacute;tico y una mejora en la sensibilidad a la insulina mostrando resistencia a la ganancia de peso a pesar de ingerir una dieta alta en grasa<sup>99</sup>. Por ello, la deficiencia en ASP se ha propuesto como una protecci&oacute;n para el desarrollo de obesidad<sup>96</sup>. Tambi&eacute;n se ha se&ntilde;alado que un aumento en los niveles de C3 y ASP en ni&ntilde;os obesos puede predisponer hacia un aumento en los dep&oacute;sitos grasos, contribuyendo a la aparici&oacute;n de obesidad en el futuro<sup>100</sup>. Por el contrario, el ayuno y la p&eacute;rdida de peso disminuyen los niveles de C3 y ASP<sup>101</sup>.</font></p>     <p><font face="Verdana" size="2">Entre los principales reguladores de la secreci&oacute;n de ASP se encuentran la insulina, los quilomicrones y el&aacute;cido retinoico<sup>102</sup>. La insulina podr&iacute;a mediar la disminuci&oacute;n en la secreci&oacute;n de ASP durante la restricci&oacute;n energ&eacute;tica, as&iacute; como el incremento encontrado a las 4-5 horas despu&eacute;s de las comidas<sup>103</sup>. Los l&iacute;pidos circulantes tambi&eacute;n desempe&ntilde;an un papel importante en la regulaci&oacute;n de ASP, dado que est&aacute; indicado que los quilomicrones incrementan su secreci&oacute;n de forma importante en cultivos de adipocitos humanos <i> in vitro</i><sup>104</sup>. Otro mediador es el &aacute;cido retinoico, transportado por los quilomicrones, el cual se ha asociado con un aumento en la s&iacute;ntesis de ASP<sup>105</sup>. Adem&aacute;s de los componentes postprandriales, la s&iacute;ntesis hep&aacute;tica de C3 es estimulada por varias citoquinas como la IL-6 y el TNF-alfa<sup>96</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Haptoglobina (Hp)</i></font></p>     <p><font face="Verdana" size="2">La haptoglobina es una prote&iacute;na de fase aguda, cuya s&iacute;ntesis en el h&iacute;gado aumenta durante la inflamaci&oacute;n<sup>106</sup>. Adem&aacute;s de su s&iacute;ntesis hep&aacute;tica, se ha demostrado su presencia en tejido adiposo de rat&oacute;n<sup>107</sup> y su liberaci&oacute;n por cultivos primarios de adipocitos humanos, siendo mayor la cantidad aportada por el tejido visceral que subcut&aacute;neo, pero en cualquier caso muy inferior a los niveles circulantes<sup>108</sup>. Adem&aacute;s, estos investigadores concluyen que las c&eacute;lulas no grasas son aparentemente m&aacute;s responsables que los adipocitos de la liberaci&oacute;n de Hp. Entre los factores que regulan su secreci&oacute;n en el h&iacute;gado y tejido adiposo se encuentran el TNF-alfa y la IL-6, entre otros<sup>109</sup>.</font></p>     <p><font face="Verdana" size="2">Los niveles de Hp mostraron correlaci&oacute;n con los niveles de insulina, colesterol total, IMC, porcentaje de grasa corporal y oxidaci&oacute;n lip&iacute;dica en sujetos sanos<sup>110</sup>. Otros autores han encontrado asociaci&oacute;n con el IMC, la leptina, la PCR y la edad, proponi&eacute;ndolo como un marcador de adiposidad en humanos<sup>111</sup>. La Hp, junto con otras prote&iacute;nas plasm&aacute;ticas sensibles a inflamaci&oacute;n (ISPs) se ha relacionado con la ganancia de peso a largo plazo6, as&iacute; como con el aumento en el riesgo cardiovascular de los sujetos obesos<sup>112</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">A pesar de la asociaci&oacute;n encontrada entre los niveles de Hp y el IMC<sup>113</sup>, su aplicaci&oacute;n como marcador de adiposidad en estudios epidemiol&oacute;gicos se deber&iacute;a realizar con cautela debido al diferente comportamiento presentado por los 3 principales fenotipos (Hp 1-1; 2-1; 2-2) de la Hp<sup>109</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Glicoprote&iacute;na zinc-alfa 2 (ZAG)</i></font></p>     <p><font face="Verdana" size="2">Una sobreexpresi&oacute;n de ZAG se presenta en una gran variedad de tumores de tipo maligno y por ello es utilizada como marcador de c&aacute;ncer<sup>114</sup>. <i> In vivo</i>, la administraci&oacute;n de ZAG a ratones indujo p&eacute;rdida de peso y de masa grasa<sup>115</sup>. Estos resultados fueron atribuidos a un efecto lipol&iacute;tico junto con un incremento en el gasto energ&eacute;tico, debido a un aumento dependiente de la dosis en la expresi&oacute;n de UCP-1 en tejido adiposo marr&oacute;n<sup>115</sup>. <i> In vitro</i>, la incubaci&oacute;n con ZAG de adipocitos aislados de rat&oacute;n estimul&oacute; la lipolisis de manera dosis-dependiente<sup>115</sup>. La ZAG tambi&eacute;n se ha asociado, a trav&eacute;s de su acci&oacute;n lipol&iacute;tica en tejido adiposo, con la p&eacute;rdida de peso y masa grasa en la caquexia presentada por ratones con c&aacute;ncer<sup>116</sup>.</font></p>     <p><font face="Verdana" size="2">En esta l&iacute;nea se ha publicado que ZAG es un factor implicado en la movilizaci&oacute;n de l&iacute;pidos, expresado y secretado por adipocitos humanos, resultando ser una nueva adipoquina<sup>106, 117</sup>. La expresi&oacute;n g&eacute;nica de ZAG en adipocitos humanos es estimulada por agonistas PPAR-gamma y suprimida por TNF-alfa, como la adiponectina<sup>117</sup>. La sobreexpresi&oacute;n de ZAG condujo a un aumento en la expresi&oacute;n de adiponectina, sugiriendo la conexi&oacute;n entre ambas adipoquinas<sup>118</sup>. Estos autores proponen este gen ZAG como gen candidato en la regulaci&oacute;n del peso corporal<sup>118</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Eotaxina</i></font></p>     <p><font face="Verdana" size="2">La eotaxina es un potente agente quimiot&aacute;ctico de eosin&oacute;filos asociada con patolog&iacute;as respiratorias<sup>119</sup>. Dado que el asma se incluye entre las complicaciones asociadas a la obesidad, y que otras quimioquinas han sido implicadas en la obesidad, la posible asociaci&oacute;n entre eotaxina y obesidad resulta de inter&eacute;s, sin embargo existe poca informaci&oacute;n todav&iacute;a en esta &aacute;rea.</font></p>     <p><font face="Verdana" size="2">Recientemente se ha publicado que los niveles circulantes de eotaxina y su expresi&oacute;n en tejido adiposo aumentaron en situaci&oacute;n de obesidad tanto en ratones como en sujetos con obesidad m&oacute;rbida, siendo la principal fuente el estroma vascular<sup>119</sup>. En ese mismo estudio se observ&oacute; que la p&eacute;rdida de peso inducida por la dieta conduce a una reducci&oacute;n en los niveles plasm&aacute;ticos de eotaxina en sujetos obesos.</font></p>     <p><font face="Verdana" size="2"><i>Visfatina</i></font></p>     <p><font face="Verdana" size="2">La visfatina, inicialmente conocida como un factor mejorador de colonias de c&eacute;lulas pre-linfoctitos B (PBEF), es una adipoquina secretada principalmente por la grasa visceral que mimetiza los efectos de la insulina y cuya expresi&oacute;n y niveles plasm&aacute;ticos se incrementan durante el desarrollo de la obesidad<sup>120</sup>. Aunque su producci&oacute;n se atribuye al tejido adiposo visceral, tambi&eacute;n est&aacute; presente en m&uacute;sculo esquel&eacute;tico, h&iacute;gado, hueso, m&eacute;dula, linfocitos; su expresi&oacute;n est&aacute; regulada por citoquinas que promueven la resistencia insul&iacute;nica, como IL-1beta, TNF-alfa y IL-6<sup>121</sup>. Aunque la afinidad de la visfatina por el receptor de la insulina parece similar a la insulina, su concentraci&oacute;n es mucho m&aacute;s baja en condiciones fisiol&oacute;gicas. Adem&aacute;s, &eacute;sta adipoquina no parece estar regulada por factores nutricionales<sup>121</sup>.</font></p>     <p><font face="Verdana" size="2">Entre los efectos fisiol&oacute;gicos de la visfatina se citan su capacidad simult&aacute;nea para facilitar la adipog&eacute;nesis y mimetizar los efectos de la insulina, proponiendo que la visfatina podr&iacute;a tener una doble funci&oacute;n una autocrina/paracrina sobre tejido adiposo visceral, facilitando la diferenciaci&oacute;n y el dep&oacute;sito graso, y otra endocrina modulando la sensibilidad a la insulina en&oacute;rganos perif&eacute;ricos<sup>121</sup>. En este sentido, sus efectos resultan parad&oacute;jicos, mientras que mejora la sensibilidad a la insulina, siendo beneficiosa para la diabetes, por el contrario favorece el dep&oacute;sito de grasa visceral contribuyendo a la obesidad<sup>121</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El hecho de que sus niveles aumenten conforme lo hace la grasa visceral y que est&eacute;n correlacionados con la grasa visceral pero no subcut&aacute;nea, establece una posible relaci&oacute;n entre esta adipoquina y el s&iacute;ndrome metab&oacute;lico<sup>120</sup>. Sin embargo y, a pesar de su nombre (Visceral fat, Visfatina), por el momento no puede ser considerada como un marcador de acumulaci&oacute;n de grasa visceral<sup>122</sup>.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se ha planteado si la visfatina podr&iacute;a ser el nexo entre la obesidad intra-abdominal (visceral) y la diabetes<sup>121</sup>. En este sentido, se trata de una adipoquina, cuya expresi&oacute;n en tejido adiposo y sus niveles en sangre, se encuentran elevados en sujetos con diabetes tipo 2 y obesos<sup>123</sup>. Sin embargo, la p&eacute;rdida de peso tras una reducci&oacute;n quir&uacute;rgica del est&oacute;mago supuso una disminuci&oacute;n en los niveles plasm&aacute;ticos de visfatina en sujetos con obesidad m&oacute;rbida, hecho que fue relacionado con cambios en la resistencia insul&iacute;nica<sup>124</sup>.</font></p>     <p><font face="Verdana" size="2">Otros autores implican a la visfatina en la patog&eacute;nesis de la diabetes tipo 2, tras encontrar una asociaci&oacute;n independiente y significativa en pacientes diab&eacute;ticos<sup>125</sup>. Estos sujetos presentaron adem&aacute;s una asociaci&oacute;n entre los niveles de visfatina plasm&aacute;ticos y el &iacute;ndice cintura/cadera. Tambi&eacute;n se ha publicado que la visfatina y la insulina se unen por diferentes regiones al receptor y que la visfatina, a diferencia de la insulina, podr&iacute;a jugar un papel en la homeostasis de la glucosa, a trav&eacute;s de una alteraci&oacute;n del proceso de s&iacute;ntesis de insulina o de los mecanismos intracelulares por lo que podr&iacute;a contribuir a la patog&eacute;nesis de la diabetes tipo 2<sup>125</sup>.</font></p>     <p><font face="Verdana" size="2">Recientemente se ha publicado que el incremento en la poblaci&oacute;n de macr&oacute;fagos encontrado en la grasa visceral de sujetos obesos podr&iacute;a ser responsable del aumento observado en la producci&oacute;n de quimioquinas, as&iacute; como de resistina y la visfatina<sup>126</sup>. Estos resultados han llevado a proponer que la visfatina junto con la adiponectina podr&iacute;an ser consideradas como marcadores del estado inflamatorio<sup>126</sup>. Con los resultados obtenidos hasta el momento, hay que indicar que son necesarias m&aacute;s investigaciones para conocer la actividad biol&oacute;gica de la visfatina y poder establecer su papel biol&oacute;gico y cl&iacute;nico.</font></p>     <p><font face="Verdana" size="2"><i>Apelina</i></font></p>     <p><font face="Verdana" size="2">La apelina es un ligando end&oacute;geno del receptor acoplado a la prote&iacute;na G (APJ), sintetizada como una preproprote&iacute;na de 77 amino&aacute;cidos que da lugar a varias formas activas, principalmente la apelina-36, apelina-13, apelina-12 y apelina-17<sup>127</sup>. Entre sus funciones fisiol&oacute;gicas se citan la regulaci&oacute;n de la funci&oacute;n cardiovascular, homeostasis de los fluidos, regulaci&oacute;n de la sed, destacando su implicaci&oacute;n en el sistema reninaangiotensina-aldosterona, su participaci&oacute;n en la funci&oacute;n inmune (inhibici&oacute;n de la infecci&oacute;n con HIV) y su papel como adipoquina<sup>128</sup>.</font></p>     <p><font face="Verdana" size="2">La expresi&oacute;n de &eacute;ste p&eacute;ptido ocurre en varios tejidos tanto de rata como humanos y entre ellos se encuentra el tejido adiposo<sup>129</sup>. En humanos, sus niveles se encuentran aumentados en situaci&oacute;n de obesidad<sup>129</sup>, habi&eacute;ndose hallado una correlaci&oacute;n positiva con los valores de IMC en obesos m&oacute;rbidos<sup>130</sup>. El sistema cardiovascular parece ser una fuente mayoritaria de apelina, ejerciendo una mejora de la funci&oacute;n card&iacute;aca y una disminuci&oacute;n en la presi&oacute;n sangu&iacute;nea lo que ha contribuido al planteamiento de su utilidad en el tratamiento de la enfermedad coronaria y en la hipertensi&oacute;n<sup>131</sup>.</font></p>     <p><font face="Verdana" size="2">Otra funci&oacute;n asociada con la apelina es la regulaci&oacute;n de la ingesta. La expresi&oacute;n de apelina en &aacute;reas hipotal&aacute;micas relacionadas con la regulaci&oacute;n del apetito ha llevado a la asociaci&oacute;n de la apelina con la leptina. As&iacute;, hay autores que han postulado un papel de la apelina junto con la leptina y la orexina-A en la saciedad<sup>130</sup>. Los resultados, tras la inyecci&oacute;n intracerebroventricular de apelina-13, muestran una reducci&oacute;n de la ingesta en ratas<sup>132</sup>, sin embargo algunos autores indican que depende del tipo de p&eacute;ptido bioactivo administrado, siendo necesarios m&aacute;s estudios al respecto<sup>130</sup>.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n la apelina se ha relacionado con la insulinemia, de forma que en ratones obesos con hiperinsulinemia se encuentra un incremento en su expresi&oacute;n en tejido adiposo, as&iacute; como un aumento en sus niveles plasm&aacute;ticos, mientras que se observa una reducci&oacute;n en su expresi&oacute;n tras el ayuno y un posterior reestablecimiento de los niveles tras la ingesta de comida<sup>129</sup>. En este mismo estudio, sujetos obesos presentaron niveles elevados de apelina y de insulina, sugiriendo la influencia de la insulina sobre los niveles de apelina. Los resultados de algunas investigaciones con adipocitos humanos y de rat&oacute;n parecen concluir que la insulina ejerce un control directo sobre la expresi&oacute;n g&eacute;nica de apelina en los adipocitos<sup>129</sup>. Por otra parte, se ha publicado que el receptor APJ se expresa en los islotes pancre&aacute;ticos y que su ligando la apelin, concretamente la apelina-26, inhibe la secreci&oacute;n de insulina estimulada por la glucemia en ratones tanto <i> in vivo como in vitro</i><sup>133</sup>.</font></p>     <p><font face="Verdana" size="2">Teniendo en cuenta el papel fisiol&oacute;gico de la apelina en el sistema cardiovascular y en el control de la homeostasis de la glucosa, algunos autores hipotetizan que la sobreproducci&oacute;n de apelina en la obesidad podr&iacute;a ser un mecanismo protector antes de que emergan las patolog&iacute;as asociadas a la obesidad, tales como diabetes tipo 2 y alteraciones cardiovasculares<sup>131</sup>. Por otro lado, estos autores tambi&eacute;n han publicado una correlaci&oacute;n entre la expresi&oacute;n de apelina y de TNF-alfa en tejido adiposo, sugiriendo un papel sin&eacute;rgico entre ambos en las patolog&iacute;as asociadas a la obesidad, como inflamaci&oacute;n cr&oacute;nica del tejido adiposo y la subsiguiente resistencia insul&iacute;nica, siendo necesario profundizar en esta investigaci&oacute;n<sup>131</sup>, de hecho estos autores cuestionan si la apelina es una adipoquina <i> amiga o enemiga</i>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">M&aacute;s informaci&oacute;n acerca de su implicaci&oacute;n en la obesidad y la resistencia insul&iacute;nica, as&iacute; como sobre el papel fisiol&oacute;gico de los diferentes fragmentos a los que da lugar es necesaria para poder plantear su utilizaci&oacute;n como mol&eacute;cula terap&eacute;utica, tal y como han indicado algunos autores<sup>134</sup>. Tambi&eacute;n, debido a la relaci&oacute;n entre la apelina y el sistema angiotensina y dada la implicaci&oacute;n de &eacute;ste sistema en gran variedad de acciones: presi&oacute;n arterial, estr&eacute;s, regulaci&oacute;n hipotal&aacute;mica de hormonas adrenales, apetito, balance h&iacute;drico, termoregulaci&oacute;n, regulaci&oacute;n del eje adipoinsular, se ha propuesto que investigar en esta &aacute;rea proporcionar&iacute;a el desarrollo de nuevas mol&eacute;culas con acciones terap&eacute;uticas<sup>134</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Alfa1-antitripsina</i></font></p>     <p><font face="Verdana" size="2">La alfa1-antitripsina (AAT) es el principal inhibidor end&oacute;geno de las proteasas con serina del plasma humano y desempe&ntilde;a un papel importante en minimizar el da&ntilde;o proteol&iacute;tico a los tejidos en los sitios de infecci&oacute;n e inflamaci&oacute;n<sup>135</sup>. Como reactante de fase aguda, sus niveles circulantes incrementan r&aacute;pidamente en respuesta a la inflamaci&oacute;n o infecci&oacute;n. Aunque su producci&oacute;n es principalmente hep&aacute;tica, los neutr&oacute;filos, los monocitos, y los macr&oacute;fagos tambi&eacute;n expresan AAT en respuesta a una variedad de mediadores inflamatorios<sup>135</sup>.</font></p>     <p><font face="Verdana" size="2">La AAT puede ejercer actividad biol&oacute;gica independiente de su funci&oacute;n inhibidora de proteasas. La AAT inhibi&oacute; la s&iacute;ntesis y liberaci&oacute;n de TNF-alfa y de IL-1 inducida por el lipopolisac&aacute;rido (LPS), mientras que favoreci&oacute; la liberaci&oacute;n de citoquinas antiinflamatorias como la IL-10 en monocitos humanos <i> in vitro</i> antiinflamatorios<sup>135</sup>. As&iacute;, el aumento en los niveles de AAT se ha asociado con un efecto protector no s&oacute;lo mediante el bloqueo de una excesiva actividad proteinasa serina sino tambi&eacute;n mediante la regulaci&oacute;n de la expresi&oacute;n de mediadores proinflamatorios y antiinflamatorios<sup>135</sup>.</font></p>     <p><font face="Verdana" size="2">Por otra parte, la AAT da lugar a mol&eacute;culas con actividad biol&oacute;gica distinta a la de su origen, ya que el fragmento carboxiterminal C-36, un producto de la degradaci&oacute;n de la AAT, se ha detectado en placas de ateroma y relacionado con factores de transcripci&oacute;n inflamatorios, como la activaci&oacute;n de NF-kB, PPAR alfa y gamma, en cultivos primarios de monocitos humanos<sup>136</sup>. Recientemente se ha publicado que el C-36 modula la activaci&oacute;n de monocitos humanos, mimetizando los efectos del lipopolisac&aacute;rido, activando TNFalfa, IL-1beta, IL-8 y el factor nuclear NF-kB<sup>137</sup>.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n la AAT se ha vinculado con la aterog&eacute;nesis a trav&eacute;s de su uni&oacute;n a receptores LDL y a receptores"basureros" como el CD36 que reconocen LDL oxidadas y median la acumulaci&oacute;n de lip&iacute;dos y la formaci&oacute;n de c&eacute;lulas espumosas<sup>138</sup>. El resultado de esta interacci&oacute;n es la producci&oacute;n de mol&eacute;culas proinflamatorias por los monocitos activados. As&iacute;, los efectos del CD-36 pueden no s&oacute;lo ser de importancia en la aterog&eacute;nesis, sino tambi&eacute;n en otros procesos inflamatorios. A d&iacute;a de hoy, se carece aparentemente de informaci&oacute;n acerca de la implicaci&oacute;n del C-36 en patolog&iacute;as como la obesidad. Sin embargo, se ha publicado que niveles elevados de prote&iacute;nas sensibles a la inflamaci&oacute;n, entre las que se citan la alfa1-antitripsina, pueden predecir la futura ganancia de peso<sup>6</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Vaspina</i></font></p>     <p><font face="Verdana" size="2">La vaspina fue identificada como un miembro de la familia de inhibidores de proteasa de serina y aislada de tejido adiposo visceral de ratas OLETF, un modelo animal de diabetes tipo 2 caracterizado por resistencia insul&iacute;nica, obesidad abdominal, hipertensi&oacute;n y dislipemia<sup>139</sup>. La expresi&oacute;n de vaspina en este tejido era muy elevada a la edad en que las ratas alcanzaron sobrepeso e insulinemia. Sin embargo, los niveles disminuyen tras el empeoramiento de la diabetes y la p&eacute;rdida de peso. Igualmente, la administraci&oacute;n de vaspina a ratones obesos mejor&oacute; la tolerancia a la glucosa, la sensibilidad a la insulina y alter&oacute; la expresi&oacute;n de genes candidatos relacionados con la resistencia insul&iacute;nica como la leptina, resistina, TNF-alfa, GLUT-4 y adiponectina<sup>140</sup>. Estos resultados indican que la vaspina favorece la sensibilidad a la insulina en el tejido adiposo visceral en situaci&oacute;n de obesidad<sup>140</sup>.</font></p>     <p><font face="Verdana" size="2">En humanos, un estudio reciente tambi&eacute;n muestra a la vaspina como una adipoquina asociada a la diabetes tipo 2 y a la obesidad<sup>141</sup>. En este trabajo la expresi&oacute;n de vaspina no se detect&oacute; en sujetos delgados (IMC &lt; 25) y con tolerancia normal a la glucosa; sin embargo, su presencia fue m&aacute;s frecuente en pacientes con diabetes mellitus tipo 2. El an&aacute;lisis estad&iacute;stico revel&oacute; que el porcentaje de grasa corporal fue el predictor m&aacute;s importante de la expresi&oacute;n de vaspina visceral, mientras que la sensibilidad a la insulina lo fue de la expresi&oacute;n de vaspina subcut&aacute;nea<sup>141</sup>.</font></p>     <p><font face="Verdana" size="2">Los autores concluyen que la regulaci&oacute;n de la expresi&oacute;n g&eacute;nica de vaspina depende del dep&oacute;sito de grasa y que podr&iacute;a asociarse con par&aacute;metros de obesidad, resistencia insul&iacute;nica y con el metabolismo de la glucosa<sup>141</sup>. Tambi&eacute;n postulan que la expresi&oacute;n de vaspina en grasa humana podr&iacute;a ser un mecanismo compensatorio intr&iacute;nseco en respuesta a la disminuci&oacute;n de la sensibilidad a la insulina y a la descompensaci&oacute;n en el metabolismo de la glucosa, tal y como ocurre en la obesidad, resistencia insul&iacute;nica y diabetes tipo 2.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">A pesar de los resultados indicados, no todos los pacientes diab&eacute;ticos, obesos, con intolerancia a la glucosa presentaron expresi&oacute;n de vaspina detectable<sup>141</sup>. Adem&aacute;s, trabajos <i> in vitro</i> muestran que la vaspina modula la acci&oacute;n de la insulina s&oacute;lo en presencia de sus proteasas diana en el tejido adiposo<sup>140</sup>. As&iacute;, m&aacute;s investigaciones acerca de los posibles mecanismos bajo los cuales se induce la expresi&oacute;n de vaspina son necesarias.</font></p>     <p><font face="Verdana" size="2"><i>Omentina</i></font></p>     <p><font face="Verdana" size="2">La omentina, previamente conocida por su expresi&oacute;n en intestino y c&eacute;lulas endoteliales, es una adipoquina expresada principalmente en tejido adiposo omental y apenas en tejido subcut&aacute;neo de primates, siendo las c&eacute;lulas vasculares estromales las responsables de su expresi&oacute;n, no las c&eacute;lulas grasas<sup>142</sup>. Este p&eacute;ptido de 313 amino&aacute;cidos contiene un dominio que est&aacute; relacionado con el fibrin&oacute;geno. Tambi&eacute;n se ha detectado en suero humano, aunque apenas se expresa en tejido adiposo de rat&oacute;n<sup>142,143</sup>.</font></p>     <p><font face="Verdana" size="2">Respecto a su papel biol&oacute;gico en humanos, se ha publicado que la omentina mejora la acci&oacute;n de la insulina, favoreciendo la absorci&oacute;n de glucosa en adipocitos de grasa omental y subcut&aacute;nea, pudiendo estar implicada en la patog&eacute;nesis de la obesidad y comorbilidades asociadas<sup>142</sup>. Tambi&eacute;n se postula su participaci&oacute;n en el metabolismo energ&eacute;tico y en la distribuci&oacute;n de grasa corporal<sup>142</sup>.</font></p>     <p><font face="Verdana" size="2">La omentina puede actuar como un factor paracrino mejorando la sensibilidad a la insulina y el metabolismo gluc&iacute;dico en grasa visceral, y adicionalmente, puesto que la omentina circula en sangre, puede actuar en otros &oacute;rganos como el m&uacute;sculo, h&iacute;gado y grasa subcut&aacute;nea para mejorar la sensibilidad a la insulina y el metabolismo gluc&iacute;dico<sup>142</sup>. La omentina junto con la visfatina y la adiponectina son adipoquinas con acci&oacute;n sensibilizadora a insulina frente a la resistina, TNF-alfa y la IL-6 que inducen resistencia insul&iacute;nica<sup>144</sup>.</font></p>     <p><font face="Verdana" size="2">La correlaci&oacute;n de las acciones biol&oacute;gicas y la medida de su expresi&oacute;n en tejido adiposo omental, as&iacute; como sus niveles circulantes en sujetos con o sin obesidad y morbilidades ayudar&aacute; a definir su papel en estas patolog&iacute;as. Igualmente, la omentina podr&iacute;a permitir comprender mejor las diferencias fisiol&oacute;gicas entre grasa omental y subcut&aacute;nea<sup>142</sup>. Por otro lado, la omentina se ha relacionado con trastornos inflamatorios intestinales como la enfermedad de Crohn, pudiendo estar relacionada con otros procesos inflamatorios<sup>143</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Prote&iacute;na transportadora de retinol (RBP4)</i></font></p>     <p><font face="Verdana" size="2">La prote&iacute;na que transporta retinol 4 (RBP4) ha sido descrita recientemente como una adipoquina que reduce la sensibilidad perif&eacute;rica y hep&aacute;tica a la insulina e incrementa la gluconeog&eacute;nesis hep&aacute;tica a trav&eacute;s de la activaci&oacute;n de la fosfoenol piruvato carboxikinasa<sup>145</sup>. As&iacute;, se ha propuesto<sup>146</sup> como un nuevo nexo de uni&oacute;n entre la obesidad y la resistencia a la insulina, presentando niveles s&eacute;ricos elevados de RBP4 sujetos obesos con insulino resistencia y diabetes tipo 2.</font></p>     <p><font face="Verdana" size="2">La RBP4 tambi&eacute;n tiene implicaciones cl&iacute;nicas en el metabolismo de los &aacute;cidos grasos, sugiri&eacute;ndose que podr&iacute;a afectar a la acci&oacute;n de la insulina a trav&eacute;s de la afectaci&oacute;n del metabolismo lip&iacute;dico<sup>147</sup>. La asociaci&oacute;n positiva de los niveles s&eacute;ricos de RBP4 con la sensibilidad a la insulina o con el metabolismo lip&iacute;dico tambi&eacute;n se ha demostrado en sujetos no obesos y sin diabetes<sup>147</sup>. Por ello, es necesario profundizar sobre el papel fisiol&oacute;gico y las consecuencias derivadas de un aumento en los niveles de RBP4, ya que algunos autores han propuesto una reducci&oacute;n en su niveles como estrategia para el tratamiento de la diabetes no dependiente de insulina<sup>146</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Ceruloplasmina</i></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La ceruloplamina (Cp) es la principal prote&iacute;na plasm&aacute;tica transportadora de cobre (95%) sintetizada principalmente en el h&iacute;gado, aunque otras c&eacute;lulas como los monocitos, astrocitos y c&eacute;lulas Sertoli tambi&eacute;n la expresan<sup>148</sup>. Esta prote&iacute;na reactante de fase aguda, incrementa su s&iacute;ntesis durante la inflamaci&oacute;n, la infecci&oacute;n, y en patolog&iacute;as asociadas<sup>149</sup>. La Cp es un miembro de la familia de prote&iacute;nas sensibles a la inflamaci&oacute;n que incluye la alfa1-antitripsina, haptoglobina, orosomucoide, y fibrin&oacute;geno y cuyos niveles se han visto asociados a factores de riesgo cardiovascular como la diabetes, la hipercolesterolemia, la hipertensi&oacute;n y el aumento del peso corporal<sup>6</sup>.</font></p>     <p><font face="Verdana" size="2">Adem&aacute;s de su funci&oacute;n transportadora, se ha descrito una actividad ferroxidasa, y una acci&oacute;n moduladora de la coagulaci&oacute;n, de la angiog&eacute;nesis, inactivadora de aminas biog&eacute;nicas y de defensa frente al estr&eacute;s oxidativo<sup>150</sup>. Debido a su actividad ferroxidasa, la Cp se ha relacionado con el metabolismo del hierro catalizando la oxidaci&oacute;n de hierro ferroso a f&eacute;rrico. Esta actividad se ha propuesto como un mecanismo por el cual la Cp tiene efectos antioxidantes, reduciendo el estr&eacute;s oxidativo a trav&eacute;s de la inhibici&oacute;n de la reacci&oacute;n de Fenton la cual utiliza hierro ferroso para generar ROS, especies reactivas de ox&iacute;geno<sup>150,151</sup>. Por el contrario, varias investigaciones han propuesto un efecto prooxidante para la Cp<sup>151</sup>.</font></p>     <p><font face="Verdana" size="2">La obesidad central tambi&eacute;n se ha relacionado con niveles elevados de Cp, postul&aacute;ndose que la determinaci&oacute;n de esta prote&iacute;na en pacientes con obesidad central podr&iacute;a ser &uacute;til para identificar pacientes con alto riesgo de infarto de miocardio<sup>152</sup>. Igualmente, niveles elevados de Cp y cobre se han asociado con la tolerancia a la glucosa y la diabetes<sup>153</sup>, as&iacute; como con los niveles de homociste&iacute;na, importante factor de riesgo cardiovascular1<sup>154</sup>.</font></p>     <p><font face="Verdana" size="2">El mecanismo por el cual la Cp puede contribuir al desarrollo de patolog&iacute;as permanece en estudio, pero se acepta que situaciones que favorezcan el estr&eacute;s oxidativo pueden ocasionar la liberaci&oacute;n del cobre de la mol&eacute;cula de Cp y, de este modo, el cobre libre reaccionar con factores prooxidantes favoreciendo la formaci&oacute;n de ROS. Adem&aacute;s, la actividad de enzimas para las cuales el cobre es un buen cofactor, por ejemplo la super&oacute;xido dismutasa (SOD), se ver&iacute;an perjudicadas y, de igual modo, la actividad ferroxidasa que depende de la integridad de la mol&eacute;cula, creando alteraci&oacute;n en el metabolismo del hierro y favoreciendo su acumulaci&oacute;n. As&iacute;, resulta que niveles elevados de Cp pueden no ser necesariamente patol&oacute;gicos sino m&aacute;s bien el estado oxidativo es el que puede determinar si la Cp es o no patol&oacute;gica<sup>150</sup>.</font></p>     <p><font face="Verdana" size="2">Teniendo en cuenta los resultados mostrados hasta la fecha, la Cp puede tener efecto prooxidante o antioxidante, dependiendo de la integridad de su estructura. El papel de la Cp en situaciones de estr&eacute;s oxidativo y como marcador del estado inflamatorio requiere nuevasinvestigaciones.</font></p>     <p><font face="Verdana" size="2"><i>Otros marcadores</i></font></p>     <p><font face="Verdana" size="2">La adiponectina y la desnutrina son otros marcadoresque tambi&eacute;n se han relacionado con el estado inflamatorio,sin embargo a diferencia de los expuestos enesta revisi&oacute;n, muestran una asociaci&oacute;n negativa confactores de adiposidad y resistencia insul&iacute;nica, as&iacute;como con otros biomarcadores<sup>14, 144</sup>.</font></p>     <p><font face="Verdana" size="2">Los niveles circulantes de adiponectina se correlacionan de forma negativa con los niveles de triglic&eacute;ridos, glucosa, insulina y HOMA-IR, con medidas de adiposidad como la circunferencia de la cintura y con biomarcadores del estado inflamatorio como la PCR y la IL-6<sup>14, 155</sup>. Adem&aacute;s de su asociaci&oacute;n con una mejora en la sensibilidad a la insulina, la adiponectina act&uacute;a como factor protector para ECV, proponiendo la hipoadiponectinemia como el mejor predictor de s&iacute;ndrome metab&oacute;lico y de riesgo cardiovascular en ni&ntilde;os y adolescentes obesos<sup>156</sup>.</font></p>     <p><font face="Verdana" size="2">La desnutrina/ATGL forma parte de la familia de prote&iacute;nas implicadas en la regulaci&oacute;n de la lip&oacute;lisis en tejido adiposo y est&aacute; regulada por factores como la alimentaci&oacute;n, as&iacute; es inducida en periodos de ayuno proporcionando &aacute;cidos grasos a otros tejidos para su oxidaci&oacute;n y disminuye tras la alimentaci&oacute;n<sup>157, 158</sup>. La expresi&oacute;n de &eacute;sta lipasa decrece en distintos modelos de obesidad pudiendo contribuir a los des&oacute;rdenes metab&oacute;licos asociados como la hiperlipidemia y la resistencia insul&iacute;nica<sup>144, 159</sup>. Tambi&eacute;n, se ha indicado que el TNF-alfa y la insulina podr&iacute;an contribuir a disminuir la expresi&oacute;n y funci&oacute;n de esta lipasa en la obesidad, hiperlipidemia y en la resistencia insul&iacute;nica<sup>144</sup>.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana"><b>Conclusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2">Diferentes biomarcadores -de origen hep&aacute;tico, procedentes del endotelio vascular, del sistema inmune y/o secretados por el propio tejido adiposo-se est&aacute;n proponiendo como nexo de uni&oacute;n entre la obesidad y comorbilidades. As&iacute;, algunos de ellos son buenos predictores de adiposidad, resistencia insul&iacute;nica, riesgo cardiovascular y/o s&iacute;ndrome metab&oacute;lico. Sin embargo, todav&iacute;a queda por dilucidar el papel de muchos de ellos en la etiolog&iacute;a de la obesidad y enfermedades asociadas en humanos as&iacute; como los mecanismos implicados. En efecto, en algunos casos se postula que estos factores pueden ser causa y en otros consecuencia de los procesos implicados: inflamaci&oacute;n, obesidad, resistencia a la insulina y enfermedad cardiovascular (<a target="_blank" href="/img/revistas/nh/v22n5/revision_f1.gif">fig. 1</a>).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><B>Referencias</B></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Gil A. Papel de los &aacute;cidos grasos monoinsaturados y poliinsaturados en los procesos inflamatorios (Libro blanco de los omega-3). Editorial M&eacute;dica Panamericana. Madrid. 2005.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3514519&pid=S0212-1611200700070000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">2. 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<body><![CDATA[<BR>E-mail: <a href="mailto:jalfmtz@unav.es">jalfmtz@unav.es</a></font></p>     <p><font face="Verdana" size="2">Recibido: 9-IV-2007.    <BR>Aceptado: 20-IV-2007.</font></p>      ]]></body><back>
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