<?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>S0212-16112009000400004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Obesidad, resistencia a la insulina y aumento de los niveles de adipoquinas: importancia de la dieta y el ejercicio físico]]></article-title>
<article-title xml:lang="en"><![CDATA[Obesity, insulin resistance and increase in adipokines levels: importance of the diet and physical activity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Rodríguez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perea]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Sobaler]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Complutense de Madrid Facultad de Farmacia Departamento de Nutrición]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<volume>24</volume>
<numero>4</numero>
<fpage>415</fpage>
<lpage>421</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112009000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112009000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112009000400004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Con el padecimiento de obesidad el tejido adiposo aumenta la cantidad de adipoquinas pro y anti inflamatorias liberadas, sustancias que están implicadas en muchas de las manifestaciones clínicas de esta patología, como la diabetes, hipertensión arterial o enfermedad cardiovascular. En una primera etapa el tejido adiposo del paciente obeso se vuelve resistente a la acción de la insulina debido a la acción de alguna de estas adipoquinas, como el factor de necrosis tumoral &alpha; (TNF-&alpha;) o la interleucina-6 (IL-6). En una segunda etapa aparece dicha resistencia en otros tejidos y se produce un aumento tanto en los niveles de glucosa como de insulina. Dicho aumento, junto con los altos niveles de adipoquinas que se producen en la obesidad, conducen a la aparición diferentes efectos adversos, entre los que se encuentran: aumento del estrés oxidativo, disfunción endotelial, aumento de la presión arterial y alteraciones del metabolismo lipoproteico, todos ellos perjudiciales para la salud. La realización de ejercicio físico, junto con el seguimiento de una dieta equilibrada, aproximada al patrón mediterráneo, con bajo consumo de grasa y sal, serían de ayuda para mejorar la resistencia a la insulina y los niveles de adipoquinas en las personas con obesidad, ayudando así a mejorar su estado de salud a largo plazo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[With obesity the amount of pro- and anti-inflammatory adipokines released is increased within the fat tissue. These molecules are implicated in many clinical manifestations of this pathology such as diabetes, arterial hypertension, or cardiovascular disease. At the first stage, the fat tissue of the obese patient becomes resistant to the action of insulin due to the effect of some of these adipokines such as tumour necrosis alpha (TNF-&alpha;) or interleukine-6 (IL-6). At a second stage, this resistance occurs at other tissues and glucose and insulin levels are increased. This increase, together with high adipokines levels that occur in diabetes, lead to the occurrence of different adverse events, such as the following: increase in oxidative stress, endothelial dysfunction, increase in blood pressure, and impairments in lipoprotein metabolism, all of which are harmful for health. Practising physical activity and following a balanced diet, similar to the Mediterranean pattern with low fat and salt consumption, would be helpful for improving insulin resistance and adipokines levels in obese people, thus helping improving their health status in the long run.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Dieta]]></kwd>
<kwd lng="es"><![CDATA[Ejercicio físico]]></kwd>
<kwd lng="es"><![CDATA[Insulina]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Diet]]></kwd>
<kwd lng="en"><![CDATA[Physical activity]]></kwd>
<kwd lng="en"><![CDATA[Insulin]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="left"><a name="top"></a><font size="2" face="Verdana"><b>REVISIÓN</b></font></p>     <p align="right">&nbsp;</p>     <p><font face="Verdana" size="4"><b>Obesidad, resistencia a la insulina y aumento de los niveles de adipoquinas: importancia de la dieta y el ejercicio f&iacute;sico</b></font></p>     <p><font face="Verdana" size="4"><b>Obesity, insulin resistance and increase in adipokines levels: importance of the diet and physical activity</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>E. Rodr&iacute;guez-Rodr&iacute;guez, J. M. Perea, A. M. L&oacute;pez-Sobaler y R. M. Ortega</b></font></p>     <p><font size="2" face="Verdana">Departamento de Nutrici&oacute;n. Facultad de Farmacia. Universidad Complutense de Madrid. Madrid. Espa&ntilde;a.</font></p>     <p><font size="2" face="Verdana"><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <hr size="1">     <p><font size="2" face="Verdana"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana">Con el padecimiento de obesidad el tejido adiposo aumenta la cantidad de adipoquinas pro y anti inflamatorias liberadas, sustancias que est&aacute;n implicadas en muchas de las manifestaciones cl&iacute;nicas de esta patolog&iacute;a, como la diabetes, hipertensi&oacute;n arterial o enfermedad cardiovascular. En una primera etapa el tejido adiposo del paciente obeso se vuelve resistente a la acci&oacute;n de la insulina debido a la acci&oacute;n de alguna de estas adipoquinas, como el factor de necrosis tumoral &alpha; (TNF-&alpha;) o la interleucina-6 (IL-6). En una segunda etapa aparece dicha resistencia en otros tejidos y se produce un aumento tanto en los niveles de glucosa como de insulina. Dicho aumento, junto con los altos niveles de adipoquinas que se producen en la obesidad, conducen a la aparici&oacute;n diferentes efectos adversos, entre los que se encuentran: aumento del estr&eacute;s oxidativo, disfunci&oacute;n endotelial, aumento de la presi&oacute;n arterial y alteraciones del metabolismo lipoproteico, todos ellos perjudiciales para la salud. La realizaci&oacute;n de ejercicio f&iacute;sico, junto con el seguimiento de una dieta equilibrada, aproximada al patr&oacute;n mediterr&aacute;neo, con bajo consumo de grasa y sal, ser&iacute;an de ayuda para mejorar la resistencia a la insulina y los niveles de adipoquinas en las personas con obesidad, ayudando as&iacute; a mejorar su estado de salud a largo plazo.</font></p>     <p><font size="2" face="Verdana"><b>Palabras clave:</b> Obesidad. Dieta. Ejercicio f&iacute;sico. Insulina.</font></p> <hr size="1">     <p><b><font size="2" face="Verdana">ABSTRACT</font></b></p>     <p><font size="2" face="Verdana">With obesity the amount of pro- and anti-inflammatory adipokines released is increased within the fat tissue. These molecules are implicated in many clinical manifestations of this pathology such as diabetes, arterial hypertension, or cardiovascular disease. At the first stage, the fat tissue of the obese patient becomes resistant to the action of insulin due to the effect of some of these adipokines such as tumour necrosis alpha (TNF-&alpha;) or interleukine-6 (IL-6). At a second stage, this resistance occurs at other tissues and glucose and insulin levels are increased. This increase, together with high adipokines levels that occur in diabetes, lead to the occurrence of different adverse events, such as the following: increase in oxidative stress, endothelial dysfunction, increase in blood pressure, and impairments in lipoprotein metabolism, all of which are harmful for health. Practising physical activity and following a balanced diet, similar to the Mediterranean pattern with low fat and salt consumption, would be helpful for improving insulin resistance and adipokines levels in obese people, thus helping improving their health status in the long run.</font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> Obesity. Diet. Physical activity. Insulin.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana"><b>Introducci&oacute;n</b></font></p>     <p><font size="2" face="Verdana">En la actualidad el tejido adiposo se considera como un &oacute;rgano endocrino muy importante. Se han identificado m&uacute;ltiples sustancias producidas en &eacute;l, con actividad tanto paracrina como autocrina<sup>1</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Entre estas sustancias se han identificado las adipoquinas, que son citoquinas liberadas por el tejido adiposo, con influencia sobre las cascadas inflamatorias, procoagulantes, antifibrinol&iacute;ticas y vasoactivas, lo que sugiere una influencia directa sobre la inflamaci&oacute;n<sup>2-4</sup>.</font></p>     <p><font size="2" face="Verdana">Se ha demostrado que 1) en ratas, cuando se produce inactividad f&iacute;sica durante un periodo de 173 horas (aproximadamente 7 d&iacute;as), despu&eacute;s de un periodo de actividad de 21 d&iacute;as, sin que se restrinja la ingesta energ&eacute;tica, aumenta el tejido adiposo abdominal y el tejido adiposo se vuelve hiperpl&aacute;sico, aunque no hipertr&oacute;fico, lo que podr&iacute;a ser debido a un mecanismo de supervivencia como respuesta a un exceso de calor&iacute;as en el organismo<sup>5</sup>, y que 2) cuando el porcentaje de grasa en la dieta es elevado se produce un desequilibrio entre la ingesta y la oxidaci&oacute;n de la grasa que conduce a un aumento en el tama&ntilde;o del tejido adiposo hasta que los adipocitos se vuelven hipertr&oacute;ficos e hiperpl&aacute;sicos. Esto hace que la lip&oacute;lisis en el tejido adiposo aumente y se liberen &aacute;cidos grasos libres (AGL)<sup>6,7</sup>. Adem&aacute;s, cuando existe obesidad, debido al exceso de grasa, y en particular a nivel visceral, el tejido adiposo segrega cantidades mucho m&aacute;s elevadas de adipoquinas, con lo que se crea un "ambiente inflamatorio", con incremento en especial en las concentraciones de factor de necrosis tumoral alpha (TNF-&alpha;), interleucina 6 (IL-6), resistina, activador del inhibidor de la activaci&oacute;n del plasmin&oacute;geno (PAI-1), leptina, fibrin&oacute;geno y componentes del sistema renina angiotensina aldosterona (SRAA)<sup>8-10</sup>. Adem&aacute;s, algunas de estas adipoquinas, sobre todo la leptina, activan c&eacute;lulas endoteliales y la acumulaci&oacute;n de macr&oacute;fagos en el tejido adiposo, los cuales liberan mol&eacute;culas proinflamatorias, entre ellas el TNF-&alpha;, lo que hace perpetuar el estado de inflamaci&oacute;n descrito en la obesidad<sup>11,12</sup>.</font></p>     <p><font size="2" face="Verdana">Por lo tanto, se ha considerado a la obesidad como un estado inflamatorio cr&oacute;nico de bajo grado que provee una relaci&oacute;n directa con otros componentes del s&iacute;ndrome metab&oacute;lico. La v&iacute;a final com&uacute;n es la aterosclerosis, causante de enfermedad vascular generalizada, conduciendo a hipertensi&oacute;n arterial, enfermedad coronaria y enfermedad vascular perif&eacute;rica<sup>8</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Obesidad y resistencia a la insulina</b></font></p>     <p><font size="2" face="Verdana">En presencia de obesidad, el tejido adiposo segrega cantidades mucho m&aacute;s elevadas de adipoquinas, en concreto de TNF-&alpha;, interleucina 6 (IL-6) y resistina, que hacen que dicho tejido se vuelva resistente a la acci&oacute;n de la insulina<sup>13</sup>. De todas estas sustancias, una de las m&aacute;s importantes es el TNF-&alpha;, que se cree que produce resistencia a la insulina al inducir un defecto en la capacidad de fosforilaci&oacute;n de residuos de tirosina en el primer sustrato del receptor de insulina (IRS-1), necesaria para la progresi&oacute;n de la se&ntilde;al intracelular de la hormona<sup>14,15</sup>, y al disminuir la expresi&oacute;n g&eacute;nica de los transportadores de glucosa insulin sensibles GLUT-4<sup>16</sup>.</font></p>     <p><font size="2" face="Verdana">Por otra parte, debido a la acci&oacute;n del TNF-&alpha;, de la IL-6, la propia expansi&oacute;n del tejido adiposo y a la aparici&oacute;n de resistencia a la insulina en el tejido adiposo, se estimula la lipasa sensible a hormonas (LSH) y se favorece la lip&oacute;lisis de los triglic&eacute;ridos almacenados en dicho tejido, lo que aumenta la liberaci&oacute;n de AGL a partir del adipocito (sobre todo por el tejido adiposo visceral)<sup>17,18</sup>. Los AGL se encuentran fuertemente relacionados (como causa y consecuencia) con resistencia a insulina y Diabetes Mellitus tipo 2<sup>19</sup>.</font></p>     <p><font size="2" face="Verdana">En una primera etapa, el paciente obeso tiene problemas de resistencia insul&iacute;nica en el tejido adiposo, pero no en el sistema muscular, en el h&iacute;gado o en el coraz&oacute;n. En una segunda etapa, los AGL se depositan en esos &oacute;rganos, sensibles a la acci&oacute;n de la insulina, y producen lipotoxicidad. La lipotoxicidad produce diferentes efectos en los mismos: induce resistencia a la insulina en el m&uacute;sculo y el h&iacute;gado al interferir con el transportador de glucosa y la captaci&oacute;n de la misma, lo que obstruye el metabolismo de la glucosa y, en &uacute;ltima instancia, impide la secreci&oacute;n de insulina por las c&eacute;lulas &beta; pancre&aacute;ticas<sup>20,21</sup>.</font></p>     <p><font size="2" face="Verdana">El mecanismo por el que se produce la disminuci&oacute;n de la captaci&oacute;n de glucosa por el m&uacute;sculo es el siguiente: cuando el m&uacute;sculo esquel&eacute;tico recibe un exceso de l&iacute;pidos desde la circulaci&oacute;n (altos niveles de AGL o triglic&eacute;ridos plasm&aacute;ticos) se produce un incremento en las concentraciones musculares de acil-CoA de cadena larga que pueden alterar el efecto de la insulina sobre el metabolismo de la glucosa, posiblemente v&iacute;a su conversi&oacute;n en diacilglicerol (DAG). El DAG activar&iacute;a isoformas de las protein quinasa C (PKCs), dando como resultado una alteraci&oacute;n en la fosforilaci&oacute;n del IRS-1 y de la actividad PI3 quinasa, lo cual afectar&iacute;a el transporte de la glucosa a trav&eacute;s del mecanismo de translocaci&oacute;n del transportador de glucosa GLUT-4 a la membrana celular y la fosforilaci&oacute;n de enzimas tales como gluc&oacute;geno sintetasa<sup>22-24</sup>.</font></p>     <p><font size="2" face="Verdana">Los AGL producen el aumento de la producci&oacute;n de glucosa por el h&iacute;gado debido, en primer lugar, a que inhiben las captaci&oacute;n de la glucosa en la c&eacute;lula hep&aacute;tica por el mismo mecanismo que se produce en el m&uacute;sculo<sup>23</sup> y, en segundo lugar, a que estimulan la gluconeog&eacute;nesis hep&aacute;tica a trav&eacute;s de la activaci&oacute;n de la acetil-CoA y su funci&oacute;n estimulante de la enzima piruvato carboxilasa, la enzima responsable de la gluconeog&eacute;nesis hep&aacute;tica<sup>25,26</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Por lo tanto, en el paciente obeso primero aparece resistencia a la acci&oacute;n de la insulina en el tejido adiposo y luego en el resto de tejidos, por lo que se produce un cuadro de intolerancia a la glucosa. Para intentar normalizar la glucemia, el p&aacute;ncreas segrega m&aacute;s insulina las personas obesas son hiperinsulin&eacute;micas), sin embargo no consigue su normalizaci&oacute;n y sigue habiendo intolerancia a la glucosa, que puede derivar a largo plazo en diabetes tipo 2 si se produce disfunci&oacute;n de las c&eacute;lulas &beta; del p&aacute;ncreas, por su hiperactividad para intentar mantener normales los niveles de glucosa y por el efecto lipot&oacute;xico de los AGL, que conduce a la acumulaci&oacute;n de cadenas largas de acil-CoA en las c&eacute;lulas beta y a la muerte de las mismas por apoptosis<sup>27-29</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Consecuencias de la elevaci&oacute;n de la glucosa, insulina y adipoquinas</b></font></p>     <p><font size="2" face="Verdana">La elevaci&oacute;n cr&oacute;nica de los niveles plasm&aacute;ticos de glucosa e insulina, junto con el de adipoquinas, tiene diferentes efectos adversos (<a target="_blank" href="/img/revistas/nh/v24n4/revision1_t1.gif">tabla I</a>), entre los que se encuentran:</font></p>     <blockquote> 	    <p><font size="2" face="Verdana">a) Aumento del estr&eacute;s oxidativo.    <br>b) Disfunci&oacute;n endotelial.    <br>c) Aumento de la tensi&oacute;n arterial.    <br>d) Alteraciones en el metabolismo lipoproteico.</font></p> </blockquote>     <p><font size="2" face="Verdana"><i>a) Estr&eacute;s oxidativo</i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Cuando aumentan los niveles de glucosa y AGL en sangre se produce un incremento en la concentraci&oacute;n de acetil-CoA que, a su vez, incrementa la producci&oacute;n de donantes de electrones (NADH) en el ciclo de los &aacute;cidos tricarbox&iacute;licos<sup>30,31</sup>. Cuando el exceso de NADH no puede ser disipado por la fosforilaci&oacute;n oxidativa (u otros mecanismos) aumenta el gradiente de protones mitocondrial y aumenta la transferencia de electrones al ox&iacute;geno, form&aacute;ndose as&iacute; radicales libres (ani&oacute;n super&oacute;xido en particular) y se produce estr&eacute;s oxidativo<sup>32</sup>.</font></p>     <p><font size="2" face="Verdana">El estr&eacute;s oxidativo induce, en primer lugar, disfunci&oacute;n endotelial. Esto es debido a que el &oacute;xido n&iacute;trico (NO) regula el tono vascular mediante la activaci&oacute;n de la guanilato ciclasa y el aumento del 3'5'-guanos&iacute;n monofosfato e inhibe la actividad plaquetaria, la adhesi&oacute;n de los leucocitos y la proliferaci&oacute;n de las c&eacute;lulas de m&uacute;sculo liso en el endotelio <sup>33,34</sup>. Cuando existe una producci&oacute;n excesiva de ani&oacute;n super&oacute;xido, la biodisponibilidad del NO disminuye debido a que se produce una inactivaci&oacute;n oxidativa del mismo en la pared vascular<sup>35</sup>. De esta forma, se pierden las funciones homeost&aacute;ticas de las c&eacute;lulas endoteliales, fen&oacute;meno que contribuye a la formaci&oacute;n de trombos, espasmo vascular, crecimiento de la &iacute;ntima, inflamaci&oacute;n y ruptura de las placas de ateroma, estado fisiopatol&oacute;gico conocido como disfunci&oacute;n endotelial<sup>36,37</sup>.</font></p>     <p><font size="2" face="Verdana">Por otra parte, el estr&eacute;s oxidativo produce un aumento de la expresi&oacute;n de citoquinas pro-inflamatorias y disminuci&oacute;n de la expresi&oacute;n de citoquinas antiinflamatorias en los tejidos<sup>38-40</sup> (<a href="#t2">tabla II</a>).</font></p>     <p align="center"><font size="2" face="Verdana"><a name="t2"><img src="/img/revistas/nh/v24n4/revision1_t2.gif" align="top"></a></font></p>     <p><font size="2" face="Verdana"><i>b) Disfunci&oacute;n endotelial</i></font></p>     <p><font size="2" face="Verdana">Se produce por diferentes motivos, el primero de ellos, como ya se ha mencionado, aparece como consecuencia del aumento del estr&eacute;s oxidativo, al disminuir la biodisponibilidad del NO<sup>36,37</sup>.</font></p>     <p><font size="2" face="Verdana">La aparici&oacute;n de la disfunci&oacute;n endotelial tambi&eacute;n se debe al aumento de los AGL, que favorecen esta disfunci&oacute;n debido a que dificultan la vasodilataci&oacute;n inducida por la insulina en el m&uacute;sculo esquel&eacute;tico<sup>41,42</sup> y que adem&aacute;s, junto con la IL-6, aumentan la producci&oacute;n de fibrin&oacute;geno, un determinante mayor de la viscosidad sangu&iacute;nea<sup>43</sup>.</font></p>     <p><font size="2" face="Verdana">Tambi&eacute;n el aumento de algunas adipoquinas que se observa en la obesidad es en parte responsable del aumento de la disfunci&oacute;n endotelial observada en esta patolog&iacute;a. En este sentido, el aumento de la producci&oacute;n de angiotensin&oacute;geno (AGE) por los adipocitos<sup>1</sup> hace aumentar la angiotensina II (ANG II), mol&eacute;cula que favorece la disfunci&oacute;n endotelial al: 1) estimular la expresi&oacute;n de mol&eacute;culas de adhesi&oacute;n (ICAM-1, VCAM-1) y MCP-1 en las c&eacute;lulas del endotelio vascular a trav&eacute;s de la activaci&oacute;n de genes que regulan la mol&eacute;cula NF-&kappa;&beta;<sup>44</sup>, 2) promover la formaci&oacute;n de radicales libres de ox&iacute;geno a partir del NO, disminuyendo as&iacute; la disponibilidad del NO y favoreciendo el da&ntilde;o sobre el tejido vascular<sup>45</sup> y 3) favorecer la angiog&eacute;nesis<sup>46</sup> y el desarrollo de hipertensi&oacute;n<sup>1</sup>, factores que se relacionan con la disfunci&oacute;n endotelial.</font></p>     <p><font size="2" face="Verdana">Otra de las adipoquinas que aumenta en la obesidad es la resistina, que parece ser un potencial responsable de la disfunci&oacute;n endotelial y de lesiones ateroescler&oacute;ticas al inducir la expresi&oacute;n de mol&eacute;culas de adhesi&oacute;n (VCAM-I, ICAM-I) sobre c&eacute;lulas endoteliales vasculares<sup>47</sup> y estimular la s&iacute;ntesis y secreci&oacute;n de otras citoquinas proinflamatorias como el TNF-&alpha;, IL-6 e IL-12, lo que puede contribuir a la resistencia insul&iacute;nica, obesidad y otras complicaciones asociadas<sup>48</sup>.</font></p>     <p><font size="2" face="Verdana"><i>c) Hipertensi&oacute;n arterial (HTA)</i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La HTA se produce debido, entre otras causas, a la disminuci&oacute;n de la producci&oacute;n de NO en la obesidad, como ya se ha comentado, mol&eacute;cula que es un potente vasodilatador de las arterias<sup>34</sup>.</font></p>     <p><font size="2" face="Verdana">Por otra parte, tambi&eacute;n aparece HTA como consecuencia del aumento de algunas adipoquinas, entre las que se encuentran el AGE, PAI-1, IL-6, TNF-&alpha; y leptina.</font></p>     <p><font size="2" face="Verdana">El aumento de la producci&oacute;n de AGE implica un aumento de la cantidad de ANG II en el organismo, que a su vez induce un incremento de la aldosterona, sustancia con efectos hipertensores debido a que hace aumentar la reabsorci&oacute;n renal de sodio<sup>49,50</sup>. Adem&aacute;s, la ANG II, junto con el TNF-&alpha;, glucosa y los AGL, aumentan la producci&oacute;n de PAI-1 en el h&iacute;gado, que se suma a la superproducci&oacute;n de PAI-1 por parte del tejido adiposo<sup>51</sup>. El PAI-1 impide que se produzca la fibrinolisis y, como consecuencia, conduce a una acumulaci&oacute;n excesiva de fibrina, con lo que pueden aparecer lesiones ateroscler&oacute;ticas<sup>52</sup>.</font></p>     <p><font size="2" face="Verdana">La IL-6 tambi&eacute;n se ha relacionado con la HTA al estimular el sistema nervioso central y simp&aacute;tico<sup>53,54</sup>, contribuir al aumento de col&aacute;geno en la pared vascular<sup>55</sup>, inducir la s&iacute;ntesis de fibrin&oacute;geno<sup>43</sup> y aumentar la concentraci&oacute;n de AGE, que posteriormente dar&aacute; lugar a ANG II, mol&eacute;cula con gran poder vasoconstrictor<sup>56</sup>.</font></p>     <p><font size="2" face="Verdana">El TNF-&alpha; tambi&eacute;n se ha asociado con patolog&iacute;as como la hipertensi&oacute;n arterial al estimular la producci&oacute;n de endotelina 1<sup>57</sup>, mol&eacute;cula que aumenta el tono vascular<sup>58</sup>.</font></p>     <p><font size="2" face="Verdana">La leptina juega un papel importante en el desarrollo de la hipertensi&oacute;n arterial, al influir sobre la producci&oacute;n de NO y la natriuresis, y en la activaci&oacute;n del sistema nervioso simp&aacute;tico, espec&iacute;ficamente a nivel renal, lo que podr&iacute;a conducir a la retenci&oacute;n de sodio, vasoconstricci&oacute;n sist&eacute;mica y elevaci&oacute;n de la presi&oacute;n arterial<sup>59</sup>.</font></p>     <p><font size="2" face="Verdana">Por &uacute;ltimo, se ha postulado que la hiperinsulinemia podr&iacute;a producir un aumento de la reabsorci&oacute;n del sodio<sup>60</sup> y de la actividad del sistema nervioso simp&aacute;tico<sup>61,62</sup>  y, por lo tanto, podr&iacute;a contribuir al aumento de la tensi&oacute;n arterial.</font></p>     <p><font size="2" face="Verdana"><i>d) Alteraciones del metabolismo lipoproteico</i></font></p>     <p><font size="2" face="Verdana">Los AGL hacen aumentar la gluconeog&eacute;nesis hep&aacute;tica y la sobreproducci&oacute;n de lipoprote&iacute;nas VLDL a nivel hep&aacute;tico, lo que deriva en un aumento de lipoprote&iacute;nas LDL peque&ntilde;as y aterog&eacute;nicas, y en una disminuci&oacute;n de las de alta densidad (HDL colesterol)<sup>63</sup>. El metabolismo anormal de las lipoprote&iacute;nas influye negativamente sobre la funci&oacute;n endotelial y el proceso aterog&eacute;nico<sup>64</sup>.</font></p>     <p><font size="2" face="Verdana">Tambi&eacute;n se ha observado que el aumento de TNF-&alpha; incrementa la concentraci&oacute;n de triglic&eacute;ridos<sup>65</sup> mediante la estimulaci&oacute;n de la producci&oacute;n de apolipoprote&iacute;na B (Apo-B) 100 y, por lo tanto, de lipoprote&iacute;nas VLDL<sup>66,67</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Por otra parte, el aumento de la glucosa induce la formaci&oacute;n de radicales libres y activa al NF-&kappa;&beta; y a la prote&iacute;n quinasa C, lo que conduce a la oxidaci&oacute;n no enzim&aacute;tica de lipoprote&iacute;nas, que contribuye de forma independiente a la aparici&oacute;n de aterog&eacute;nesis<sup>68</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Importancia de la dieta y el ejercicio f&iacute;sico</b></font></p>     <p><font size="2" face="Verdana">A pesar de que un incremento del porcentaje de grasa en la dieta se asocia con un aumento en el tama&ntilde;o del tejido adiposo, existen diferencias seg&uacute;n el tipo de &aacute;cido graso que predomine en la dieta. Las dietas ricas en &aacute;cidos grasos monoinsaturados (MUFA) previenen la distribuci&oacute;n central de grasa y la disminuci&oacute;n postpandrial en la expresi&oacute;n gen&eacute;tica perif&eacute;rica de adiponectina y la resistencia de insulina inducida por una dieta rica en hidratos de carbono<sup>69</sup>. Las dietas ricas en &aacute;cidos grasos poliinsaturados (PUFA) suprimen la transcripci&oacute;n de genes que codifican para enzimas lipog&eacute;nicas (&aacute;cido graso sintasa, acetil-CoA carboxilasa y esteril-CoA desaturasa) en el tejido adiposo y el h&iacute;gado. Simult&aacute;neamente inducen la transcripci&oacute;n de genes que codifican para prote&iacute;nas que intervienen en la oxidaci&oacute;n de l&iacute;pidos (carnitina-palmitoil transferasa y acil CoA oxidasa), transporte de l&iacute;pidos y &aacute;cidos grasos y adipoquinas (adiponectina y TNF-&alpha;) en el tejido adiposo<sup>70-72</sup>. Por &uacute;ltimo, las dietas ricas tanto en PUFA como en MUFA podr&iacute;an modificar la leptina en plasma al disminuir la expresi&oacute;n del gen que codifica para la misma<sup>7</sup>.</font></p>     <p><font size="2" face="Verdana">Aparte de la grasa, se han encontrado efectos de otros nutrientes sobre el tejido adiposo. Por ejemplo, las dietas ricas en sodio inducen una adiposidad que se caracteriza por la aparici&oacute;n de hipertrofia en los adipocitos y aumento de la concentraci&oacute;n de leptina en plasma<sup>73</sup>. Un aporte adecuado de calcio en la dieta se ha relacionado con la inhibici&oacute;n de la 1&alpha;,25-(OH)<sub>2</sub>-D<sub>3</sub>, lo que conduce a una inhibici&oacute;n de la inflamaci&oacute;n asociada con la obesidad al disminuir la expresi&oacute;n de TNF-&alpha; e IL-6 por los adipocitos<sup>74</sup> y el &aacute;cido retinoico y la vitamina D inhiben la secreci&oacute;n de leptina por el tejido adiposo<sup>75,76</sup>.</font></p>     <p><font size="2" face="Verdana">Por otra parte, algunos autores han encontrado efectos beneficiosos del seguimiento de una dieta de tipo mediterr&aacute;nea sobre el estado inflamatorio que aparece en la obesidad. En un ensayo efectuado a 180 pacientes (99 hombres y 81 mujeres) con s&iacute;ndrome metab&oacute;lico, donde la mitad de ellos siguieron una dieta estilo mediterr&aacute;nea y la otra mitad una dieta habitual (50 a 60% de carbohidratos, 15 a 20% de prote&iacute;nas y &lt; 30% de grasas), se demostr&oacute;, despu&eacute;s de dos a&ntilde;os de intervenci&oacute;n, que los pacientes que consum&iacute;an la dieta estilo mediterr&aacute;nea, comparado con el grupo control, hab&iacute;an reducido significativamente las concentraciones plasm&aacute;ticas de PCR, IL-6, IL-7, IL-8, la resistencia a la insulina y mejoraron la funci&oacute;n endotelial<sup>77</sup>.</font></p>     <p><font size="2" face="Verdana">En cuanto a la realizaci&oacute;n de ejercicio f&iacute;sico, &eacute;ste favorece la metabolizaci&oacute;n de los AGL en las mitocondrias, evitando su almacenamiento y reduciendo la lipotoxicidad que &eacute;stos producen<sup>78,79</sup>.</font></p>     <p><font size="2" face="Verdana">Por lo tanto, la realizaci&oacute;n de ejercicio f&iacute;sico, junto con el seguimiento de una dieta equilibrada, aproximada al patr&oacute;n mediterr&aacute;neo, evitando el excesivo consumo de grasa, aumentando la ingesta de grasas ricas en PUFA (ya que, aunque tanto los MUFA como los PUFA tienen efectos beneficiosos, la ingesta actual de MUFA es elevada y la de PUFA algo baja, por lo que es necesario hacer especial &eacute;nfasis en el aumento de PUFA)<sup>80</sup>, y disminuyendo el consumo de sal, ser&iacute;a de ayuda para prevenir la lipotoxicidad, mejorar la resistencia a la insulina y los niveles de adipoquinas en las personas con obesidad.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Referencias</b></font></p>     ]]></body>
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