<?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>S0212-16112007000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelos animales para el estudio de la respuesta inflamatoria sistémica y de nutrición parenteral]]></article-title>
<article-title xml:lang="en"><![CDATA[Animal models for the study of systemic inflammatory response and parenteral nutrition]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morán Penco]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Extremadura Facultad de Medicina Departamento de Cirugía]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>146</fpage>
<lpage>159</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112007000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112007000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112007000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El Síndrome de Respuesta Inflamatoria Sistémica (SRIS) parece desencadenarse por la activación de un tipo de receptores llamados Toll-Like, propios de las células de respuesta inflamatoria y que, a través de señales citosólicas específicas, producen una cascada de reacciones que activan las Citocinas, Factores de Crecimiento y otros mediadores inflamatorios. En este trabajo, repasamos y discutimos varias clasificaciones de Modelos Animales para el estudio del SRIS y proponemos que estos modelos se dividan según los objetivos concretos a estudiar; que podrían ser los siguientes: 1º Para el estudio de los genes reguladores de los receptores Innatos y Adaptativos, de la respuesta inmunoinflamatoria. 2º Para el estudio de los receptores de señalización (Citocinas y Factores de Crecimiento). 3º Para el estudio de la respuesta frente a los señalizadores. 4º Para el estudio de tratamientos mediante bloqueo anti-inflamatorio específico (ILs, TNF y otros). 5º Modelos específicos de Sepsis. 6º Otros Modelos Inductores de SRIS. 7º Para el estudio de Modelos Terapéuticos diversos: -Tratamientos Anti-Inflamatorios. -Tratamientos Anticoagulantes: Inhibición de la Coagulación en ensayos Humanos-Fase II, con anticoagulantes: Antitrombina III, PCA y TFPI. -Tratamientos Antibióticos. -Tratamientos con Reposición de Volúmenes. -Tratamientos Quirúrgicos. En lo que respecta al apartado de Modelos animales para el estudio de la Nutrición Parenteral, podríamos hacer la siguiente clasificación y resumen de lo tratado: 1. Modelos Animales para el estudio de la Vía Parenteral de Administración. 2. Modelos para el estudio de la viabilidad, absorción y tolerancia locales en la vía de administración. 3. Modelos para el estudio de las Complicaciones. 4. Modelos animales para el estudio de la farmacodinamia, metabolización e investigación de la tolerancia de nuevas moléculas o substratos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The systemic inflammatory response syndrome (SRIS) seems to be due to the activation of the toll-like receptors, specific of the inflammatory response cells, through concrete cytosolic signals which lead to a cascade of reactions acting cytokins, growing factors and others inflammatory mediators. This kind of work revewes and discusses several classifications of animals models to study the SRIS, and propose to divide these models according to concrete goals, which can be the following ones: 1º To study innate and adaptative receptors of regulatory gens in the SRIS. 2º To study signals receptors (cytokines and growing factors). 3º To study the answer to signals. 4º To study treatments through specifics antinflammatory blockage. 5º Specific models of sepsis. 6º Others inducing models of SRIS. 7º Others therapeutical models. -Antinflammatories.-Antiacoagulans: Coagulations inhibition in human assays.-Phase II Anticoagulans: Antitrombine III, PCA y TFPI. -Antibiotics. -Replacing Volume Treatments.-Surgical Treatments. As to the animals models to study Parenteral Nutrition, we could make the next classifications and sum it up: 1. Animal models to study the parenteral via of administration. 2. Models to study viability, absorption and local tolerance of the administration via. 3. Study models for complications. 4. Animal models to study pharmacodynamic, metabolization and to investigate the tolerance of new molecules or substrates.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome de respuesta inflamatoria sistémica]]></kwd>
<kwd lng="en"><![CDATA[Systemic inflammatory response syndrome]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><b><a name="top"></a>REVISIÓN</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Modelos animales para el estudio de la respuesta inflamatoria sist&eacute;mica y de nutrici&oacute;n parenteral</b></font></p>     <p><b><font face="Verdana" size="4">Animal models for the study of systemic inflammatory response and parenteral nutrition</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>J. M. Mor&aacute;n Penco</b></font></p>     <p><font face="Verdana" size="2">Profesor de Cirug&iacute;a. Departamento de Cirug&iacute;a. Facultad de Medicina. U.Ex. Director del Servicio de Animalario. Universidad de Extremadura. 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 S&iacute;ndrome de Respuesta Inflamatoria Sist&eacute;mica (SRIS) parece desencadenarse por la activaci&oacute;n de un tipo de receptores llamados Toll-Like, propios de las c&eacute;lulas de respuesta inflamatoria y que, a trav&eacute;s de se&ntilde;ales citos&oacute;licas espec&iacute;ficas, producen una cascada de reacciones que activan las Citocinas, Factores de Crecimiento y otros mediadores inflamatorios. En este trabajo, repasamos y discutimos varias clasificaciones de Modelos Animales para el estudio del SRIS y proponemos que estos modelos se dividan seg&uacute;n los objetivos concretos a estudiar; que podr&iacute;an ser los siguientes:    <BR>1º Para el estudio de los genes reguladores de los receptores Innatos y Adaptativos, de la respuesta inmunoinflamatoria.    <BR>2º Para el estudio de los receptores de se&ntilde;alizaci&oacute;n (Citocinas y Factores de Crecimiento).    <BR>3º Para el estudio de la respuesta frente a los se&ntilde;alizadores.    <BR>4º Para el estudio de tratamientos mediante bloqueo anti-inflamatorio espec&iacute;fico (ILs, TNF y otros).    <BR>5º Modelos espec&iacute;ficos de Sepsis.    <BR>6º Otros Modelos Inductores de SRIS.    <BR>7º Para el estudio de Modelos Terap&eacute;uticos diversos: -Tratamientos Anti-Inflamatorios. -Tratamientos Anticoagulantes: Inhibici&oacute;n de la Coagulaci&oacute;n en ensayos Humanos-Fase II, con anticoagulantes: Antitrombina III, PCA y TFPI. -Tratamientos Antibi&oacute;ticos. -Tratamientos con Reposici&oacute;n de Vol&uacute;menes. -Tratamientos Quir&uacute;rgicos.    ]]></body>
<body><![CDATA[<BR>En lo que respecta al apartado de Modelos animales para el estudio de la Nutrici&oacute;n Parenteral, podr&iacute;amos hacer la siguiente clasificaci&oacute;n y resumen de lo tratado:    <BR>1. Modelos Animales para el estudio de la V&iacute;a Parenteral de Administraci&oacute;n.    <BR>2. Modelos para el estudio de la viabilidad, absorci&oacute;n y tolerancia locales en la v&iacute;a de administraci&oacute;n.    <BR>3. Modelos para el estudio de las Complicaciones.    <BR>4. Modelos animales para el estudio de la farmacodinamia, metabolizaci&oacute;n e investigaci&oacute;n de la tolerancia de nuevas mol&eacute;culas o substratos.</font></p>     <p><font face="Verdana" size="2"><B>Palabras clave:</B> S&iacute;ndrome de respuesta inflamatoria sist&eacute;mica.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><B>ABSTRACT</B></font></p>     <p><font face="Verdana" size="2">The systemic inflammatory response syndrome (SRIS) seems to be due to the activation of the toll-like receptors, specific of the inflammatory response cells, through concrete cytosolic signals which lead to a cascade of reactions acting cytokins, growing factors and others inflammatory mediators. This kind of work revewes and discusses several classifications of animals models to study the SRIS, and propose to divide these models according to concrete goals, which can be the following ones:    <BR>1º To study innate and adaptative receptors of regulatory gens in the SRIS.    <BR>2º To study signals receptors (cytokines and growing factors).    ]]></body>
<body><![CDATA[<BR>3º To study the answer to signals.    <BR>4º To study treatments through specifics antinflammatory blockage.    <BR>5º Specific models of sepsis.    <BR>6º Others inducing models of SRIS.    <BR>7º Others therapeutical models. -Antinflammatories.-Antiacoagulans: Coagulations inhibition in human assays.-Phase II Anticoagulans: Antitrombine III, PCA y TFPI. -Antibiotics. -Replacing Volume Treatments.-Surgical Treatments.    <br>As to the animals models to study Parenteral Nutrition, we could make the next classifications and sum it up:    <BR>1. Animal models to study the parenteral via of administration.    <BR>2. Models to study viability, absorption and local tolerance of the administration via.    <BR>3. Study models for complications.    <br>4. Animal models to study pharmacodynamic, metabolization and to investigate the tolerance of new molecules or substrates.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><B>Key words:</B> Systemic inflammatory response 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">Desde tiempos prehist&oacute;ricos se han usado diversos tipos de animales para comprobar la toxicidad de m&uacute;ltiples alimentos, venenos naturales y extractos. Desde luego, en la medicina egipcia (la mejor y m&aacute;s avanzada de su &eacute;poca), posteriormente en la del medio oriente (asiria, persa, etc) y en la &Aacute;rabe y Jud&iacute;a espa&ntilde;olas, se efectuaban ensayos de toxicidad farmacol&oacute;gica y otros ensayos quir&uacute;rgicos con diversos tipos de animales. En Europa, se usa el rat&oacute;n por primera vez en el siglo XVI y, en el siglo XVIII, se usan animales para observar la inyecci&oacute;n de productos alimenticios. E. Jenner, en 1798, logra la primera vacuna de la viruela, tras experimentar en varios animales. Especialmente importantes fueron los avances logrados en fisiolog&iacute;a, a lo largo del siglo XIX, con el uso del animal de experimentaci&oacute;n por el gran fisi&oacute;logo franc&eacute;s Cl. Bernard y de otros fisi&oacute;logos Franceses, Rusos, Ingleses, Alemanes o de otras nacionalidades. L. Pasteur, en 1885, logra la vacuna antir&aacute;bica y luego se logran las antidift&eacute;ricas, las de la polio, etc. Todas ellas por experimentaci&oacute;n animal<sup>1-3</sup>. Finalmente, merecen rese&ntilde;arse la introducci&oacute;n de los experimentos en primates No-humanos a principios del siglo XX<sup>1,4</sup> y los enormes avances logrados con la cirug&iacute;a experimental y la experimentaci&oacute;n con animales transg&eacute;nicos, durante los siglos XX y el actual<sup>1,5,6</sup>. No cabe duda que, con el uso de animales transg&eacute;nicos, hemos aprendido mucho acerca de la gen&eacute;tica, de los mediadores y de la fisiopatolog&iacute;a de la respuesta inflamatoria, as&iacute; como de la cicatrizaci&oacute;n de las lesiones titulares<sup>7,8</sup>.</font></p>     <p><font face="Verdana" size="2">En lo referente a la Nutrici&oacute;n Artificial (NA), esta fue precisamente iniciada por Christopher Wren, en el siglo XVIII, en un modelo experimental con perros, tratando de administrarles vino en la vena, mediante una ca&ntilde;a de ave. Posteriormente, a finales de los a&ntilde;os 60&rsquo;, Dudrick y cols., desarrollaron tambi&eacute;n en perros el m&eacute;todo de NP prolongada, a trav&eacute;s de un cat&eacute;ter central y su primera aplicaci&oacute;n cl&iacute;nica<sup>9</sup>. La NA, la podemos dividir en: Nutrici&oacute;n Enteral (NE), que a su vez podr&iacute;a ser subdividida en tramos anat&oacute;micos de administraci&oacute;n digestiva (g&aacute;strica, duodenal, yeyunal) o por tipos de preparados (elementales, semielementales&hellip;) y en Nutrici&oacute;n Parenteral (NP), que a su vez podr&iacute;amos subdividirla seg&uacute;n la v&iacute;a de infusi&oacute;n (V&iacute;a venosa Central, Perif&eacute;rica o Peritoneal), por la carga de substratos administrados (Parcial o Completa) o por el tiempo de administraci&oacute;n (corto o a largo plazo). Pues bien, en el caso de la NA y, mas concretamente de NP, adem&aacute;s de requerirse modelos animales para el estudio de la v&iacute;a de administraci&oacute;n, como en todos los estudios nutricionales, los objetivos pueden ser muy diversos: estudios para conocer las necesidades cualitativas y cuantitativas de los substratos, sus concentraciones, variedades concretas de los mismos, formas y ritmos de administraci&oacute;n, estudios de farmacodinamia, farmacogen&eacute;tica, fisisopatolog&iacute;a y de tolerancia, o de todas las posibles complicaciones tras su administraci&oacute;n, etc.<sup>10,11</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Objetivos</b></font></p>     <p><font face="Verdana" size="2">Intentaremos demostrar la necesidad del uso del animal de experimentaci&oacute;n para el estudio y tratamiento del S&iacute;ndrome de Respuesta Inflamatoria Sist&eacute;mica (SRIS), as&iacute; como ofrecer unas gu&iacute;as pr&aacute;cticas de los modelos animales m&aacute;s &uacute;tiles.</font></p>     <p><font face="Verdana" size="2">Respecto de los Modelos Animales para el estudio de la Nutrici&oacute;n Parenteral (NP), pretendemos indicar cuales animales, &uacute;tiles o arneses y condiciones de estabulaci&oacute;n que puedan ser m&aacute;s adecuadas y, m&aacute;s a&uacute;n, concretar los dise&ntilde;os experimentales as&iacute; como los modelos id&oacute;neos para los diferentes aspectos de la investigaci&oacute;n en NP (v&iacute;as, metabolismo de los substratos, interferencias, nutrigen&oacute;mica, complicaciones etc.).</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana"><b>Material y m&eacute;todos</b></font></p>     <p><font face="Verdana" size="2">Hemos revisado la literatura de los &uacute;ltimos veinticinco a&ntilde;os, tanto de tratados actuales como de art&iacute;culos especializados sobre el uso de los animales de experimentaci&oacute;n, del dise&ntilde;o experimental y de los modelos animales para los estudios del S&iacute;ndrome de Respuesta Inflamatoria Sist&eacute;mica y para los estudios en Nutrici&oacute;n Artificial y Parenteral. Tambi&eacute;n hemos estudiado la legislaci&oacute;n actual, Internacional y espa&ntilde;ola, sobre el animal de experimentaci&oacute;n<sup>12-13</sup>.</font></p>     <p><font face="Verdana" size="2">Finalmente, hemos revisado nuestra experiencia en la experimentaci&oacute;n animal para estos estudios, iniciada en 1981.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Resultados y discusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2"><i>Modelos experimentales para el estudio de la respuesta inflamatoria sist&eacute;mica</i></font></p>     <p><font face="Verdana" size="2">Desde el punto de vista hist&oacute;rico, para llegar al actual concepto del SRIS, podr&iacute;amos destacar las siguientes etapas<sup>14</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- El primer concepto que asociar al SRIS, ser&iacute;a el de "Colapso perif&eacute;rico" (post-febril, hemorr&aacute;gico, card&iacute;aco...), establecido por Frank en 1896 y mas desarrollado por Starling en 1905. Este fue el primer punto de vista termodin&aacute;mico o de transferencia t&eacute;rmica entre sistemas y/u &oacute;rganos; desde la piel y m&uacute;sculos hacia los &oacute;rganos centrales.</font></p> 	    <p><font face="Verdana" size="2">- El siguiente paso fue el de Shock, con sus grados y tipos de Shock (infeccioso, cardiog&eacute;nico, hipovol&eacute;mico, post-traum&aacute;tico, gran quemado, neurog&eacute;nico&hellip;). Esta teor&iacute;a fue desarrollada entre los a&ntilde;os 1920 a 1960.</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">- Sigui&oacute; el de Fallo org&aacute;nico, mejor expresado en el de Fallo Multiorg&aacute;nico o de m&uacute;ltiples &oacute;rganos. Establecida en la d&eacute;cada de los 70&rsquo;</font></p> 	    <p><font face="Verdana" size="2">- Finalmente, en estos &uacute;ltimos a&ntilde;os se ha recuperado de nuevo el concepto termodin&aacute;mico. Desde entonces, se acepta definitivamente la fisiopatolog&iacute;a inflamatoria como un proceso que puede finalizar en un Fallo Multiorg&aacute;nico<sup>15,16</sup>.</font></p> </blockquote>     <p><font face="Verdana" size="2">Las posibles etiolog&iacute;as del Fallo Multiorg&aacute;nico y del Shock, podr&iacute;amos dividirlas en<sup>17</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Cl&iacute;nicas: Pancreatitis, Gran quemadura, Infecci&oacute;n por Gran-negativos (endotoxinas) o por algunos Gran-positivos (exotoxinas), Virus/hongos, Politraumatismo o Traumatismo grave (especialmente con contusi&oacute;n pulmonar), Isquemia/Reperfusi&oacute;n (en cirug&iacute;a vascular o de otro origen&hellip; "<i>siempre fue mas grave la isquemia que la hipoxia relativa de un &oacute;rgano</i>").</font></p> 	    <p><font face="Verdana" size="2">- Experimentales: S&eacute;psis Peritoneal inducida (LPS, inyecci&oacute;n IP de g&eacute;rmenes, ADN viral&hellip;), Isquemia/Reperfusi&oacute;n quir&uacute;rgica-experimental, Administraci&oacute;n de endotoxinas (LPS, PAMPs), Administraci&oacute;n de Citocinas, S&iacute;ndrome Compartimental, Ventilaci&oacute;n Artificial An&oacute;mala (Vt altos...), otros, incluyendo los inmunol&oacute;gicos y los gen&eacute;ticamente determinados (Nock-out, Transg&eacute;nicos)...</font></p> </blockquote>     <p><font face="Verdana" size="2">Cl&iacute;nicamente, el SRIS se diagnostica cuando el paciente tiene m&aacute;s de uno de los datos cl&iacute;nicos referidos a continuaci&oacute;n y en el caso del adulto. Estos mismos signos (de respuesta inflamatoria), pueden tambi&eacute;n observarse en ausencia de causas infecciosas:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">&bull; Temperatura corporal &gt; 38 &deg;C or &lt; 36 &deg;C.</font></p> 	    <p><font face="Verdana" size="2">&bull; Frecuencia Card&iacute;aca &gt; 90/min.</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">&bull; Hiperventilaci&oacute;n, evidenciada por una frecuencia respiratoria &gt; 20/min o una PaCO2 de &lt; 32 mmHg.</font></p> 	    <p><font face="Verdana" size="2">&bull; Leucocitosis de &gt; 12.000 c&eacute;lulas/&mu;l o &lt; 4.000 celulas/&mu;l.</font></p> </blockquote>     <p><font face="Verdana" size="2">Pues bien, una vez visto lo anterior, podr&iacute;amos hacernos las siguientes preguntas: &iquest;Hay etiopatogenias comunes a esos procesos?, &iquest;hay mecanismos fisopatol&oacute;gicos compartidos?, &iquest;existe una respuesta inflamatoria sist&eacute;mica que conecte a todos esos fen&oacute;menos cl&iacute;nicos y fisopatol&oacute;gicos? La respuesta es S&Iacute;: En muchos de estos procesos, no en todos, existen unos mecanismos moleculares e inmunol&oacute;gicos que, ante las diversas etiopatogenias, configuran una respuesta de tipo inflamatorio, y que pueden llevar a un fallo multi-org&aacute;nico.</font></p>     <p><font face="Verdana" size="2">Y, &iquest;cuales ser&iacute;an esos mecanismos bioqu&iacute;micos e inmunol&oacute;gicos primarios que, ante las diversas etiopatogenias, configuran una respuesta tipo inflamatorio, y que pueden llevar a un fallo org&aacute;nico? Pues nuestra respuesta podr&iacute;a ser la siguiente:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">1º: La activaci&oacute;n de la Familia de Receptores de Membrana (especialmente los de tipo Toll-Like receptors), al inicio del proceso patog&eacute;nico, y la producci&oacute;n celular de los Factores de Se&ntilde;alamiento, son los eventos moleculares comunes. Independientemente de la etiopatogenia o del&oacute;rgano inicialmente afecto.</font></p> 	    <p><font face="Verdana" size="2">2º: Las alteraciones de la Microcirculaci&oacute;n (Capilar/Intersticio), constituyen el proceso final que pueden llevar al Fallo multiorg&aacute;nico y a la muerte del paciente.</font></p> </blockquote>     <p><font face="Verdana" size="2">Recordemos que el sistema Inmunol&oacute;gico o de respuesta inmune se distribuye, anat&oacute;micamente, en &oacute;rganos encapsulados (Timo, Bazo, M&eacute;dula &oacute;sea, Ganglios linf&aacute;ticos) y en &aacute;reas difusas (Anillo de Waldeyer, Placas de Peyer, L&aacute;mina propia intestinal, Tejidos linfoides pulmonar y urogenital, H&iacute;gado etc.), encargados a su vez de originar dos tipos de respuesta:</font></p>     <p><font face="Verdana" size="2">1. La Innata, dividida a su vez en:</font></p>     <blockquote> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">&bull; Inmediata (segundos), originada por Macr&oacute;fagos y Mastocitos, a trav&eacute;s de la activaci&oacute;n del Complemento y la Lisozima.</font></p> 	    <p><font face="Verdana" size="2">&bull; Inducida (Horas y d&iacute;as), originada por los Linfocitos NK, Eosin&oacute;filos, Bas&oacute;filos, Endoteliecitos y neutr&oacute;filos, a trav&eacute;s de mediadores como Citocinas, Interferones, Prote&iacute;nas de fase aguda y otros mediadores inflamatorios. En estas dos, intervienen las barreras anat&oacute;micas locales, de las &aacute;reas infectadas o agredidas, adem&aacute;s de la Sangre, H&iacute;gado y M&eacute;dula &Oacute;sea.</font></p> </blockquote>     <p><font face="Verdana" size="2">2. La Adquirida o Adaptativa (en semanas): Aqu&iacute; intervienen tambi&eacute;n la Sangre, el Bazo, el Timo, M&eacute;dula &Oacute;sea y Linfa, a trav&eacute;s de los Linfocitos T y B y las C&eacute;lulas Dendr&iacute;ticas que originan Anticuerpos, Citocinas, Citolisinas y Mol&eacute;culas HLA.</font></p>     <p><font face="Verdana" size="2">Pues bien, en 1991 Spaetzle y cols. descubrieron que en la Mosca del Vinagre el mecanismo de activaci&oacute;n de sus defensas inmediatas era a trav&eacute;s de la activaci&oacute;n de unos Receptores caracter&iacute;sticos que fueron llamados Toll-Like (TLR). Posteriormente, en 1997, Medzhitov y cols.<sup>18</sup> clonaron en el ser humano un receptor hom&oacute;logo, llamado tambi&eacute;n Toll-Like y que, posteriormente se ha subdividido en subtipos TLR-2, 4, 5, 9. Todos ellos reconocer&iacute;an a subproductos bacterianos, llamados PAMPs, fundamentalmente los Lipopolisac&aacute;ridos (LPS), m&aacute;s propios de la bacterias Gram-. Estos activadores externos (LPS para los Gram- y, seg&uacute;n parece actualmente, otros activadores end&oacute;genos<sup>19</sup>: Ac. Hialur&oacute;nico, Fibronectinas, Surfactantes, Complejos IgG, Ac. La&uacute;rico y muchos otros), activar&iacute;an a los diferentes subtipos de TLR de los Macr&oacute;fagos, Mastocitos y sus derivados. A trav&eacute;s de se&ntilde;ales citos&oacute;licas (IRAK, NFb etc.), originar&iacute;an en el n&uacute;cleo la producci&oacute;n de una cascada de mediadores, llamados Citocinas, Factores de Crecimiento (GF) y otros productos Pro-Inflamatorios (Metabolitos del O2, Metabolitos del Ac. Araquid&oacute;nico, Enzimas hidrol&iacute;ticas, ON etc.), desencadenando la respuesta sist&eacute;mica en la Sepsis o el SRIS. Esto explica: 1) Como puede iniciarse el SIRS, en ausencia de PAMPs/LPS (SRIS est&eacute;ril). 2) Como los TLR unen la respuesta inmunitaria innata y adaptada frente a virus, tumores, transplantes&hellip;</font></p>     <p><font face="Verdana" size="2">El esquema m&aacute;s actualizado ser&iacute;a, en mi opini&oacute;n el representado en la <a target="_blank" href="/img/revistas/nh/v22n2/revision2_f1.gif">figura 1</a>, y propuesto por Brunn &amp; Platt en el 2006<sup>20</sup>. En este esquema, la teor&iacute;a anterior esta se&ntilde;alada en gris.</font></p>     <p><font face="Verdana" size="2">Por otra parte y para nuestros objetivos, nos interesa destacar que las Citocinas son los principales mediadores de se&ntilde;alamiento y diferentes a los Factores de Crecimiento. Las citocinas son P&eacute;ptidos o glucoproteinas reguladores, con PM de 5 a 30 kd, liberados por casi todas las c&eacute;lulas nucleadas (especialmente los Leucocitos, Linfocitos y Fibroblastos) y muy potentes a concentraciones de pico a nanomolares. Act&uacute;an a corta y larga distancia y controlan o modulan la respuesta inmune y/o la reparaci&oacute;n celular (crecimiento, diferenciaci&oacute;n, metabolismo y s&iacute;ntesis proteica). Las principales son: Interleucinas (IL1 a IL18), Interferones, Factores estimulantes de colonias: GM-CSF. G-CSF, Quimiocinas (CXC, CXXC&hellip;), Los Factores Estimulantes de Colonias (GM-CSF. G-CSF) y TGF&beta; y TNF&alpha;. Los Factores de Crecimiento tienen como blanco a c&eacute;lulas NO-Hematopoy&eacute;ticas y las citoquinas a las inmunitarias y hematopoy&eacute;ticas. Los principales ser&iacute;an: Hormonas como la Insulina, Progesterona, Somatomedina etc., los VEGF, EGF, FGF, IGF, PDGF y tambi&eacute;n los TGF y TNF. En la  <a target="_blank" href="/img/revistas/nh/v22n2/revision2_f2.gif">figura 2</a> las representamos en su relaci&oacute;n con el SRIS<sup>21</sup>.</font></p>     <p><font face="Verdana" size="2">As&iacute; pues, podr&iacute;amos resumir el proceso de Respuesta Inmune e Inflamatoria en los siguientes Mecanismos Patog&eacute;nicos:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">1. Activaci&oacute;n de los Receptores innatos (Toll-Like Receptors): reconocen DNA, lipoprote&iacute;nas, LPS&hellip; mejor si est&aacute;n opsonizados con complemento o PCR.</font></p> 	    <p><font face="Verdana" size="2">2. Liberaci&oacute;n de Citocinas: TNF-&alpha;, IL-1&beta;, IL-6&hellip; y de Factores de Crecimiento.</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">3. Activaci&oacute;n de P&eacute;ptidos de la Coagulaci&oacute;n y de Plaquetas (Antitrombinas, Tromboxanos, PCR, Factores plaquetarios&hellip;).</font></p> 	    <p><font face="Verdana" size="2">4. Activaci&oacute;n de Mediadores metab&oacute;licos y Endocrinol&oacute;gicos: (PUFAs/eicosanoides, leucotrienos, RL-O3-.., P&eacute;ptidos adren&eacute;rgicos-NAd-Ad-5HT,&hellip;).</font></p> 	    <p><font face="Verdana" size="2">5. Activaci&oacute;n de la respuesta Inmune espec&iacute;fica o adaptativa.</font></p> 	    <p><font face="Verdana" size="2">6. Activaci&oacute;n de otros Mediadores Vasculares y de la Microcirculaci&oacute;n: (ON, CO y otros espec&iacute;ficos de algunos &oacute;rganos).</font></p> </blockquote>     <p><font face="Verdana" size="2">En la <a target="_blank" href="/img/revistas/nh/v22n2/revision2_f3.gif">figura 3</a> se expone un esquema de todo ello. Adem&aacute;s, en el SRIS se producen las siguientes alteraciones metab&oacute;licas<sup>22</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- En el Metabolismo de los Carbohidratos: 1) Hiperglucemia y alta disponibilidad sist&eacute;mica de glucosa. 2) Glicolisis. Resistencia Perif&eacute;rica a la Insulina. 3) Gliconeogenesis (desde lactato -Ciclo de Cori-).</font></p> 	    <p><font face="Verdana" size="2">- En el Metabolismo Lip&iacute;dico: 1) Actividad Lipol&iacute;tica. Hipertrigliceridemia (S&iacute;ntesis). Cetog&eacute;nesis. 2) Infiltraci&oacute;n grasa del h&iacute;gado (Macroesteatosis/Microesteatosis).</font></p> 	    <p><font face="Verdana" size="2">- En el Metabolismo Proteico: 1) Catabolismo proteico: Hueso, M&uacute;sculo, Intestino y Tejido Conectivo. 2) S&iacute;ntesis de prote&iacute;nas de prote&iacute;nas viscerales de la homeostasis (Ej. albumina). 3) S&iacute;ntesis de prote&iacute;nas de fase-aguda (en la &uacute;ltima fase de Sepsis o SIRS). Tambi&eacute;n se produce una Hiperlactatemia y una Acidosis Metab&oacute;lica.</font></p> </blockquote>     <p><font face="Verdana" size="2">Las siguientes preguntas ser&iacute;an: &iquest;por qu&eacute; debemos utilizar modelos animales y, en este caso, cuales modelos?, y, a estas, trataremos de darle respuesta en las pr&oacute;ximas l&iacute;neas.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Hemos de partir de que la filogen&eacute;tica del sistema inmune y de respuesta inflamatoria es muy diversa entre las diferentes especies evolutivas, por lo que, para estudiar las diferentes partes de esa respuesta inmuno-inflamatoria, tendremos que acudir a muy diversos tipos y variedad de animales. M&aacute;xime teniendo en cuenta que estamos ante hechos biol&oacute;gicos y tambi&eacute;n patol&oacute;gicos y, adem&aacute;s, de que en la especie humana la variedad metab&oacute;lica y de expresi&oacute;n g&eacute;nica entre individuos es enorme<sup>23,24</sup>.</font></p>     <p><font face="Verdana" size="2">Las especies animales mas utilizadas para el estudio del Shock, Sepsis y SRIS podemos resumirlas en la <a href="#t1">tabla I</a>, incluyendo las especies primates NO humanos. A lo anterior, hemos de a&ntilde;adir las actuales variedades transg&eacute;nicas, que han permitido el estudio pormenorizado de la gen&eacute;tica de los receptores, citocinas y otros mediadores implicados en el SRIS<sup>23-25</sup>. Se utilizan como prueba definitiva para conocer las funciones de un gen y sus efectos. O bien se expresa exageradamente dicho gen (en un organismo), y/o bien se suprime el mismo, pero siempre es m&aacute;s f&aacute;cil sobre-expresarlo que suprimirlo. Resumimos a continuaci&oacute;n los pasos esenciales para lograrlo:</font></p>     <p align="center"><font face="Verdana" size="2"><a name="t1"><img src="/img/revistas/nh/v22n2/revision2_t1.gif"></a></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2">A. El proceso de sobre-expresi&oacute;n es el siguiente:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">1º Se construye el fragmento de ADN que nos interesa, mediante t&eacute;cnicas de ADN recombinante (Trans-g&eacute;n). Incluyendo todas las zonas que contiene el gen (con las regiones de promoci&oacute;n y la reguladora. Dependiendo del promotor utilizado, podremos expresar el gen en m&aacute;s o menos tejidos).</font></p> 	    <p><font face="Verdana" size="2">2º Se introduce el trans-g&eacute;n en un pronucleo masculino de un huevo fecundado, mediante microinyecci&oacute;n (alrededor de un 5% integrar&aacute;n el transg&eacute;n).</font></p> 	    <p><font face="Verdana" size="2">3º Se investiga en los animales la expresi&oacute;n del trans-g&eacute;n.</font></p> </blockquote>     <p><font face="Verdana" size="2">B. Para conseguir expresar los efectos No-dominantes de un gen, hay que crear animales transg&eacute;nico"anulados" mediante la supresi&oacute;n del gen a estudiar, lo que resulta mucho m&aacute;s dif&iacute;cil. Para ello se procede de la siguiente manera:</font></p>     ]]></body>
<body><![CDATA[<blockquote> 	    <p><font face="Verdana" size="2">1º Se modifica el ADN del gen hasta hacerlo afuncional.</font></p> 	    <p><font face="Verdana" size="2">2º Se introduce este gen en un vector y en l&iacute;neas celulares germinales.</font></p> 	    <p><font face="Verdana" size="2">3º Estas c&eacute;lulas germinales originan animales heterocigotos pero, cruz&aacute;ndolos entre s&iacute;, se consiguen animales homocigotos para ese gen mutado y anulado.</font></p> </blockquote>     <p><font face="Verdana" size="2">Es obvio que hay diferencias entre los resultados obtenidos entre las diferentes especies as&iacute; como entre estas y la especie humana. Pero es tambi&eacute;n cierto que, en la especie humana no hay un solo modelo y que tambi&eacute;n influyen m&uacute;ltiples factores, como la edad, sexo, condici&oacute;n fisiol&oacute;gica o patol&oacute;gica, etc. (ver <a href="#f4">Fig. 4</a>). Por ello, nunca se insistir&aacute; lo suficiente en que, los modelos animales se utilizan para entender "lo que sucede" y elaborar hip&oacute;tesis que sean dignas de considerarse, con la suficiente seguridad para los ensayos humanos m&aacute;s definitivos.</font></p>     <p align="center"><font face="Verdana" size="2"><a name="f4"><img src="/img/revistas/nh/v22n2/revision2_f4.gif"></a></font></p>     <p><font face="Verdana" size="2">En la <a target="_blank" href="/img/revistas/nh/v22n2/revision2_t2.gif">tabla II</a>, resumimos los modelos animales utilizados y comparados con las caracter&iacute;sticas de la sepsis humana. Observense las importantes diferencias, ya se&ntilde;aladas por otros autores<sup>25</sup>.</font></p>     <p><font face="Verdana" size="2">Respecto de los modelos, creo necesario exponer dos clasificaciones posibles. La primera es la de los colegas Ramos y Lorente, de la unidad de investigaci&oacute;n del HU Getafe y publicada en el 2005<sup>25</sup> y la segunda ser&iacute;a una propia. En ambas, resulta obvio que, para estudiar todos los aspectos implicados en el SRIS, m&aacute;xime para realizar la transferencia cl&iacute;nica de resultados, hay que realizar muchos modelos.</font></p>     <p><font face="Verdana" size="2">A continuaci&oacute;n exponemos la clasificaci&oacute;n modificada de modelos animales para el estudio de la Sepsis y del SRIS, propuesta recientemente por este experto grupo de estudio espa&ntilde;ol. (Tomado y modificado de N. Ramos y J. Lorente/2005)<sup>25</sup>.</font></p>     <p><font face="Verdana" size="2">1. Elecci&oacute;n del modelo: formulaci&oacute;n de la pregunta de investigaci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<blockquote> 	    <p><font face="Verdana" size="2">1.1. Sobre los Mecanismos Compensadores: Hiper o hipodinamia<sup>26</sup>.</font></p> 	    <p><font face="Verdana" size="2">1.2. Sobre la Progresi&oacute;n de la Disfunci&oacute;n de los&Oacute;rganos: efecto del tiempo<sup>27</sup>.</font></p> 	    <p><font face="Verdana" size="2">1.3. Sobre la Activaci&oacute;n de la Respuesta Inflamatoria<sup>28</sup>.</font></p> 	    <p><font face="Verdana" size="2">1.4. Sobre las posibles Intervenciones Terap&eacute;uticas<sup>29</sup>.</font></p> </blockquote>     <p><font face="Verdana" size="2">2. Modelos de endotoxinemia (sobre todo LPS, v&iacute;a i.v.)<sup>25,28,30-35</sup>.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">2.1. Modelos de endotoxinemia en roedores (Las Ratas son + resistentes).</font></p> 	    <blockquote> 		    <p><font face="Verdana" size="2">&bull; Efecto de la dosis.</font></p> 		    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">&bull; Efecto de la duraci&oacute;n de la administraci&oacute;n.</font></p> 		    <p><font face="Verdana" size="2">&bull; V&iacute;a de administraci&oacute;n.</font></p> 		    <p><font face="Verdana" size="2">&bull; Modelos de sensibilizaci&oacute;n.</font></p> 	</blockquote> 	    <p><font face="Verdana" size="2">2.2. Modelo de Endotoxinemia en ovejas (pues los Perros son + resistentes).</font></p> 	    <p><font face="Verdana" size="2">2.3. Modelo de Endotoxinemia en humanos (pues los Primates son + resistentes).</font></p> </blockquote>     <p><font face="Verdana" size="2">3. Modelos de infecci&oacute;n bacteriana.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">3.1. Modelo de Infecci&oacute;n bacteriana en Roedores: E. Coli en Cobayo<sup>36</sup>.</font></p> 	    <p><font face="Verdana" size="2">3.2. Modelo de bacteriemia: E. Coli en el cerdo y P. Aeruginosa en la Oveja<sup>37</sup>.</font></p> 	    <p><font face="Verdana" size="2">3.3. Modelo de bacteriemia: E. Coli en Primates<sup>38</sup>.</font></p> </blockquote>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">4. Modelos de peritonitis.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">4.1. Peritonitis inducida mediante implantaci&oacute;n de bacterias vivas o material fecal<sup>39</sup>.</font></p> 	    <p><font face="Verdana" size="2">4.2. Modelo de ligadura y punci&oacute;n del ciego: en Ratas para las peritonitis localizadas y Cobayo, Conejo y Perro para las difusas<sup>40</sup>.</font></p> </blockquote>     <p><font face="Verdana" size="2">5. Modelos que reciben tratamiento<sup>41-47</sup>.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">5.1. Tratamientos Anti-inflamatorios.</font></p> 	    <p><font face="Verdana" size="2">5.2. Tratamientos Antibi&oacute;ticos.</font></p> 	    <p><font face="Verdana" size="2">5.3. Tratamientos Anticoagulantes.</font></p> 	    <p><font face="Verdana" size="2">5.4. Tratamientos Hemodin&aacute;micos.</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">5.5. Tratamiento Ventilatorio.</font></p> 	    <p><font face="Verdana" size="2">5.6. Tratamiento Quir&uacute;rgico.</font></p> </blockquote>     <p><font face="Verdana" size="2">Por nuestra parte, y considerando otros aspectos, como el tipo de animal, y en aras de concretar m&aacute;s el tipo u objetivo del estudio, as&iacute; como la opini&oacute;n de otros expertos internacionales, nos atrevemos a proponer otra clasificaci&oacute;n o gu&iacute;a pr&aacute;ctica siguiente:</font></p>     <p><font face="Verdana" size="2"><i>Modelos animales para el estudio de la respuesta inflamatoria (local y sistemica):</i></font></p>     <p><font face="Verdana" size="2">1. Para el estudio de los genes reguladores de los receptores Innatos y Adaptativos<sup>18-20,48-52</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Mosca Drosophila Melanogaster (mosca del Vinagre y de la fruta): tipo Toll-Like.</font></p> 	    <p><font face="Verdana" size="2">- Cepas de Ratones Transg&eacute;nicos: Tipo Sultzermice transg&eacute;nicos (CH3/HeN: TLR4+ y -). Para la gen&eacute;tica de los receptores IFN-&gamma;R, JAK-STAT. Ratones deficientes en RelA, IRF5, MyD88, TLR9,7 y 3, as&iacute; como los TBK1 deficientes.</font></p> 	    <p><font face="Verdana" size="2">- Cepas de Ratas Trang&eacute;nicas resistentes a Endotoxina: Rata CH3/HeN y variantes.</font></p> 	    <p><font face="Verdana" size="2">- Estudios de Expresi&oacute;n/Sobreexpresi&oacute;n de TLR en Pacientes con Sepsis/SRIS.</font></p> </blockquote>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">2. Para el estudio de los receptores de se&ntilde;alizadores (Citocinas ILs, TNF, y F.C: VEGF, EGF, FGF, IGF, PDGF) y de Apoptosis (activaci&oacute;n de Caspasas): con/sin estimulaci&oacute;n LPS y otros<sup>53-56</sup>.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Ratones transg&eacute;nicos uni y doblemente defectivos.</font></p> 	    <p><font face="Verdana" size="2">- Embriones de aves, rat&oacute;n y otros peque&ntilde;os animales (Gerviles etc, m&aacute;s raros).</font></p> 	    <p><font face="Verdana" size="2">- Ratones Nock-Out Endog&aacute;micos C3H/HeJ, resistentes (para estudios de estimulaci&oacute;n).</font></p> </blockquote>     <p><font face="Verdana" size="2">3. Para el estudio de la respuesta frente a los se&ntilde;alizadores (Citocinas, Hormonas -Ins., Progest., Somatom.-, Leucotri., Trombox., Prostagland., Cinina/Calicreina, FAP, eicosanoides, ON, CO&hellip;): Se incluyen Modelos Murinos con Quemaduras y Extractos de Escaras de Quemadura<sup>57-59</sup>.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Modelos en Roedores: Ratones, Ratas, Cobayos y Conejos.</font></p> 	    <p><font face="Verdana" size="2">- Modelos Caninos, Bovinos, Ovinos y Cerdos.</font></p> 	    <p><font face="Verdana" size="2">- Modelos en Primates No-Humanos.</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">- Modelos en Humanos sanos.</font></p> </blockquote>     <p><font face="Verdana" size="2">4. Para el estudio de los tratamientos mediante bloqueo antiinflamatorio especifico (ILs, TNF y otros): Glucocorticoides, Anticuerpos-TNF e ILs (Infliximab, Etanercept), con Drotrecogin-&alpha; (PcR), con Antisueros anti-MIP (antiquimiocinas) <sup>60-63</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Modelos con Peque&ntilde;os Roedores (Ratones manipulados, y Transg&eacute;nicos) e Inmunodeprimidos.</font></p> 	    <p><font face="Verdana" size="2">- Modelos en Primates NO-Humanos.</font></p> 	    <p><font face="Verdana" size="2">- Modelos de Ensayos Cl&iacute;nicos en Pacientes con Sepsis, SRIS o Inmuno-deprimidos.</font></p> </blockquote>     <p><font face="Verdana" size="2">5. Modelos espec&iacute;ficos de Sepsis<sup>64-68</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Mediante infusi&oacute;n de g&eacute;rmenes (bacteriemia).</font></p> 	    <p><font face="Verdana" size="2">&bull; V&iacute;a Intravenosa:</font></p> 	    ]]></body>
<body><![CDATA[<blockquote> 		    <p><font face="Verdana" size="2">+ E. Coli, en Cobayas.</font></p> 		    <p><font face="Verdana" size="2">+ P. Aeruginosa en Ovejas. Ideal para el estudio del Pulm&oacute;n de Shock.</font></p> 		    <p><font face="Verdana" size="2">+ E. Coli en Primates NH (varios Modelos).</font></p> 	</blockquote> 	    <p><font face="Verdana" size="2">&bull; V&iacute;a Intraperitoneal:</font></p> 	    <blockquote> 		    <p><font face="Verdana" size="2">+ Implantaci&oacute;n de Materia fecal, con Gelatina o Bario, en Ratas.</font></p> 		    <p><font face="Verdana" size="2">+ Implantaci&oacute;n de Coagulo Infectado, en Perros.</font></p> 	</blockquote> 	    <p><font face="Verdana" size="2">- Mediante ligadura/punci&oacute;n del ciego (LPC): Cl&aacute;sico y &uacute;til para el estudio de las peritonitis: usar Ratas para las peritonitis localizadas y Cobayo, Conejo y Perro para las difusas.</font></p> </blockquote>     <p><font face="Verdana" size="2">6. Otros Modelos Inductores de SRIS<sup>69-70</sup>:</font></p>     ]]></body>
<body><![CDATA[<blockquote> 	    <p><font face="Verdana" size="2">- Pancreatitis: Inyecci&oacute;n de AB/Enteroquinasa en conducto pancre&aacute;tico en Cerdos.</font></p> 	    <p><font face="Verdana" size="2">- Mediante Hemorragia/Cirug&iacute;a Abdominal + Ventilaci&oacute;n en Ratas y otros animales.</font></p> 	    <p><font face="Verdana" size="2">- Mediante Isquemia/Reperfusi&oacute;n Intestinales, en Roedores, Cerdos y Primates NH.</font></p> </blockquote>     <P><font face="Verdana" size="2">7. Modelos Terape&uacute;ticos<sup>71-77</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">- Tratamientos Anti-Inflamatorios: Ensayos en Humanos tratados con Antag. IL-1, PC-activada y Ac Monoclonales anti TNF.</font></p> 	    <p><font face="Verdana" size="2">- Tratamientos Anticoagulantes: Inhibici&oacute;n de la Coagulaci&oacute;n en ensayos humanos-Fase II, con anticoagulantes: Antitrombina III, PCA y TFPI.</font></p> 	    <p><font face="Verdana" size="2">- Tratamientos Antibi&oacute;ticos: Todos los ensayos pre-cl&iacute;nicos/Farmacol&oacute;gicos de Eficacia, en animales y Ensayos Humanos en Fases II y III.</font></p> 	    <p><font face="Verdana" size="2">- Tratamientos con Reposici&oacute;n de Vol&uacute;menes:</font></p> 	    ]]></body>
<body><![CDATA[<blockquote> 		    <p><font face="Verdana" size="2">Tipos Hiper o Hipodin&aacute;micos.</font></p> 		    <blockquote> 			    <p><font face="Verdana" size="2">+ Ensayos de hipotensi&oacute;n mediante iNOS, en ensayos humanos, Fase II.</font></p> 			    <p><font face="Verdana" size="2">+ Ensayos de la L-N-Metil-Arginina (LNMMA) en Shock S&eacute;ptico en Humanos. Fase III</font></p> 		</blockquote> 	</blockquote> 	    <p><font face="Verdana" size="2">- Tratamientos Ventilatorios: Con Vt. Alto/baja PEEP: Conejos, Ovejas y Primates.</font></p> 	    <p><font face="Verdana" size="2">- Tratamientos Quir&uacute;rgicos: Todos los ensayos de Profilaxis. Los de Drenaje y los de T&eacute;cnicas de Lavado y Limpieza en Procedimientos Quir&uacute;rgicas de Contaminaci&oacute;n. Los de Infecci&oacute;n del campo quir&uacute;rgico: Primates y Humanos.</font></p> </blockquote>     <p><font face="Verdana" size="2">8. M&eacute;todos alternativos<sup>78,79</sup>:</font></p>     <p><font face="Verdana" size="2">1. M&eacute;todos celulares e "in vitro":</font></p>     <blockquote> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">&bull; Para el estudio de los genes reguladores de los receptores Innatos y Adaptativos.</font></p> 	    <p><font face="Verdana" size="2">&bull; Para el estudio de los receptores de Se&ntilde;alizadores (Citocinas ILs, TNF, y F.C: VEGF, EGF, FGF, IGF, PDGF) y de Apoptosis (activaci&oacute;n de Caspasas).</font></p> </blockquote>     <blockquote> 	    <p><font face="Verdana" size="2">&bull; Para el estudio de la respuesta frente a los se&ntilde;alizadores.</font></p> </blockquote>     <p><font face="Verdana" size="2">2. Experimentaci&oacute;n en humanos<sup>80-82</sup>:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">&bull; Para el estudio de tratamientos mediante bloqueo antiinflamatorio espec&iacute;fico (ILs, TNF y otros): Glucocorticoides, Anticuerpos-TNF e ILs (Infliximab, Etanercept), con Drotrecogin-&alpha; (PcR), con Antisueros anti-MIP (antiquimiocinas)&hellip;</font></p> 	    <p><font face="Verdana" size="2">&bull; Modelos Terap&eacute;uticos y su traslaci&oacute;n a la cl&iacute;nica.</font></p> </blockquote>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Conclusiones, para los modelos animales en el SRIS</b></font></p>     ]]></body>
<body><![CDATA[<blockquote> 	    <p><font face="Verdana" size="2">1. No hay modelos animales capaces de reproducir de forma completa ni la sepsis ni el cuadro de sris.</font></p> 	    <p><font face="Verdana" size="2">2. Cada modelo animal debe ser elegido espec&iacute;ficamente para el estudio de un aspecto concreto: gen&eacute;tico, etiopatog&eacute;nico, fisiopatol&oacute;gico, terape&uacute;tico etc.</font></p> 	    <p><font face="Verdana" size="2">3. En los aspectos terape&uacute;ticos, deben separarse los estudios hemodin&aacute;micos, pulmonares o ventilatorios, farmacol&oacute;gicos cardi-vasculares, de terapia anti-inflamtoria etc.</font></p> 	    <p><font face="Verdana" size="2">4. Las revisiones sistem&aacute;ticas de estudios en animales han permitido alcanzar conclusiones que se asemejan a los resultados de ensayos cl&iacute;nicos.</font></p> 	    <p><font face="Verdana" size="2">5. Los actuales tratamientos de la sepsis y del SRIS, est&aacute;n basadas en ensayos cl&iacute;nicos que fueron dise&ntilde;ados en base a un gran cuerpo de conocimiento procedente de estudios pre-cl&iacute;nicos.</font></p> 	    <p><font face="Verdana" size="2">6. El estudio del SRIS en modelo pre-cl&iacute;nicos contin&uacute;a siendo extraordinariamente necesario para avanzar en el conocimiento de la biolog&iacute;a de la sepsis y del SRIS humanos y en el dise&ntilde;o de estrategias terap&eacute;uticas eficaces.</font></p> </blockquote>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Modelos animales para el estudio de la nutrici&oacute;n parenteral</b></font></p>     <p><font face="Verdana" size="2">La Nutrici&oacute;n Parenteral (NP) es un tipo de nutrici&oacute;n muy especial pues, aunque lleg&aacute;semos a administrar exactamente la misma composici&oacute;n en tipo y concentraci&oacute;n de nutrientes en una bolsa y por v&iacute;a Parenteral (Intravenosa o Intraperitonealmente), nunca ser&aacute; igual que la v&iacute;a oral, ni en forma ni bioqu&iacute;mica, fisiol&oacute;gica, bromatol&oacute;gica ni psicol&oacute;gicamente. Y ello es as&iacute;, en primer lugar, porque la v&iacute;a influye decisivamente para la digestibilidad y metabolizaci&oacute;n de los substratos por parte del tubo digestivo e h&iacute;gado y, por tanto, para su posterior uso y corporal<sup>83,84</sup> (ver figs. <a target="_blank" href="/img/revistas/nh/v22n2/revision2_f5.gif">5</a> y <a target="_blank" href="/img/revistas/nh/v22n2/revision2_f6.gif">6</a>).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En primer lugar, veremos cuales deber&iacute;an ser las condiciones b&aacute;sicas para los estudios experimentales en NP:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">1. Las especies animales a utilizar, deben estar bien definidas como animales de laboratorio y ser gen&eacute;ticamente homog&eacute;neas<sup>85</sup>.</font></p> 	    <p><font face="Verdana" size="2">2. Los animales transg&eacute;nicos utilizados deben ser estabulados en condiciones SPF y usados para objetivos muy concretos<sup>86</sup>.</font></p> 	    <p><font face="Verdana" size="2">3. La cantidad de animales a utilizar y el dise&ntilde;o experimental deben estar estad&iacute;sticamente bien definidos -con antelaci&oacute;n- y en funci&oacute;n de los objetivos principales (main goals), evit&aacute;ndose el utilizarlos para otros "objetivos secundarios"<sup>85,87</sup>.</font></p> 	    <p><font face="Verdana" size="2">4. Recordar que los tiempos de Infusi&oacute;n parenteral son siempre "relativamente" cortos, pero no pudi&eacute;ndose "trasladar" los tiempos de vida de unas especies a otras. Es decir: 2 semanas de NP en un perro, no quieren decir, necesariamente, un equivalente a 3-4 meses de NP en un humano<sup>87,88</sup>.</font></p> 	    <p><font face="Verdana" size="2">5. La experimentaci&oacute;n en NP exige del uso de arneses muy espec&iacute;ficos y homologados que permitan la movilidad adecuada del animal y la reducci&oacute;n del estr&eacute;s. Adem&aacute;s, los experimentos que exijan un balance metab&oacute;lico completo, deben hacerse en jaulas espec&iacute;ficas, que permitan una mensuraci&oacute;n precisa de dicho balance. Finalmente, en lo referente a procedimientos tecnol&oacute;gicos, la administraci&oacute;n de dicha NP, exige la colocaci&oacute;n de cat&eacute;teres intravenosos (o intraperitoneales), que han de hacerse en condiciones as&eacute;pticas y dejarlos en condiciones de adecuada estanqueidad y, en caso de la v&iacute;a venosa, en anticoagulaci&oacute;n<sup>87,89</sup>(ver figs. 	<a target="_blank" href="/img/revistas/nh/v22n2/revision2_f7.gif">7</a>, 	<a target="_blank" href="/img/revistas/nh/v22n2/revision2_f8.gif">8</a> y 	<a target="_blank" href="/img/revistas/nh/v22n2/revision2_f9.gif">9</a>).</font></p> 	    <p><font face="Verdana" size="2">6. La extrapolaci&oacute;n de resultados extra&iacute;dos de los modelos animales debe ser progresiva, en escala y muy acotada a los resultados obtenidos. Los resultados sirven para entender los fen&oacute;menos etiopatog&eacute;nicos, fisiopatol&oacute;gicos, bioqu&iacute;micos, farmacol&oacute;gicos o de otro tipo, y programar los correspondientes proyectos de estudio en humanos, pero no para extrapolaciones y aplicaciones directas<sup>90</sup>.</font></p> </blockquote>     <p><font face="Verdana" size="2">Pasaremos ahora a valorar la importancia del dise&ntilde;o experimental en los modelos animales para estudios de la NP. Es decir, los dise&ntilde;os experimentales recomendables y previamente definidos que, en nuestra opini&oacute;n pueden resumirse en dos<sup>87,88,91,92</sup>:</font></p>     <blockquote> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">A. De Muestras Apareadas (lineales), donde comparamos la evoluci&oacute;n de la variable a lo largo del tiempo. Por ejemplo, tomando datos de la misma a lo largo de 24 h o de d&iacute;as o semanas. En ellas se comparan los datos evolutivos, con los niveles "basales" (el control es el Tº cero). Estos estudios ahorran animales y son mas "fiables". Ej. curvas metab&oacute;licas, de absorci&oacute;n&hellip;.</font></p> 	    <p><font face="Verdana" size="2">B. De Muestras Independientes (o de Grupos frente al Control): son necesarios cuando comparamos la variable y par&aacute;metros analizados en diferentes condiciones experimentales. Los resultados obtenidos en los "grupos experimentales" los comparamos frente a los de un Grupo Control. Gastan m&aacute;s animales y el dise&ntilde;o tiene menos fiabilidad. Han de usarse cuando, por el objeto de estudio, no se pueden usar los de Muestras Apareadas.</font></p> </blockquote>     <p><font face="Verdana" size="2">Existen otros, pero o son de excepcional aplicaci&oacute;n o pueden evitarse.</font></p>     <p><font face="Verdana" size="2">Hacemos la siguiente "Propuesta de Clasificaci&oacute;n", para estudios de la NP.</font></p>     <blockquote> 	    <p><font face="Verdana" size="2">&bull; Modelos Animales para el estudio de la V&iacute;a Parenteral<sup>85,93,94</sup>: Deben ser los animales m&aacute;s parecidos anat&oacute;micamente al ser humano: primates y, en casos de agotamiento de v&iacute;as, las pruebas en los propios pacientes.</font></p> 	    <p><font face="Verdana" size="2">&bull; Modelos Animales para el estudio de la absorci&oacute;n y tolerancia locales en la v&iacute;a de administraci&oacute;n (central, perif&eacute;rica, peritoneal&hellip;)<sup>95-98</sup>: Inicialmente, Roedores: Rata, Cobayo, Conejo (de tipos Standard), para los estudios individuales con cada preparado y tambi&eacute;n para los estudios de posibles interferencias entre estos y con otras medicaciones. Posteriormente, podemos pasar a Perros, cerdos (&iquest;o primates?).</font></p> 	    <p><font face="Verdana" size="2">&bull; Modelos para el estudio de las Complicaciones: (complicaciones mec&aacute;nicas, infecciosas, metab&oacute;licas o viscerales asociadas a la NP)<sup>99-106</sup>: Modelos de grandes animales, como c&aacute;nidos, cerdos, (&iquest;primates?). Para conocer muy en detalle estas posibles complicaciones es necesario pasar a la fase de ensayos cl&iacute;nicos con pacientes. Para el estudio de las complicaciones hepato-biliares asociadas a la NP, deben desecharse la rata y el rat&oacute;n.</font></p> 	    <p><font face="Verdana" size="2">&bull; Modelos para el estudio de la Farmacodinamia, Metabolizaci&oacute;n y de la Tolerancia de nuevas mol&eacute;culas o substratos (Nutrigen&oacute;mica)<sup>107-110</sup>: Roedores gen&eacute;ticamente similares (Rata/rat&oacute;n), transg&eacute;nicos. Aqu&iacute; podr&iacute;amos tambi&eacute;n incluir aquellos modelos animales para reproducir enfermedades o d&eacute;ficit enzim&aacute;ticos (Favismo, Aminoacidosis, Diabetes, Hipertrigliceridemias y Colesteronemias etc.), que pudieran padecer algunos pacientes y que obligar&iacute;an a estudios con substratos muy espec&iacute;ficos: En este caso,  ser&iacute;a casi obligado el uso de Roedores transg&eacute;nicos.</font></p> </blockquote>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana"><B>Bibliograf&iacute;a sobre modelos animales en el SRIS</B></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Archivald D, Ditchfield R: The contribution of Laboratory Animal Science to welfare of man and animals. Academic Press. New York. 1985.</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=3500235&pid=S0212-1611200700020000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">2. Hau J, Van Hoosier GL: Handbook of Laboratory Animal Science. Vol. 1. 2nd. CRC Press. Boca Rat&oacute;n. Fl. 2003.</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=3500236&pid=S0212-1611200700020000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">3. Fox JG, Cohen BJ, Loew FM: Laboratory Animal Medicine. Academic Press. London. 1984.</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=3500237&pid=S0212-1611200700020000400003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">4. Dukelow WR: Nonhuman Primate Models for Human Disease. CRC Press Boca Rat&oacute;n, Fl. 1983.</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=3500238&pid=S0212-1611200700020000400004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">5. Gay WI: Methods of Animals Experimentation. Research Surgery and care of the Research Animal. Vol VII; Part. C. Surgical Approachs to the organ Systems. Academic Press. London. 1985.</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=3500239&pid=S0212-1611200700020000400005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">6. First NL, Haseltine FP: Transgenic Animals. Science Tech. 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Cap. 18. en Fundamentos de Pr&aacute;ctica Quir&uacute;rgica. JA Rodr&iacute;guez Montes. Ed, Ram&oacute;n Areces. 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=3500242&pid=S0212-1611200700020000400008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">9. Wilmore DW, Dudrick SJ: Growth and Development of a infant receiving all nutrients exclusively by vein. JAMA 1968; 203: 260.</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=3500243&pid=S0212-1611200700020000400009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">10. 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<body><![CDATA[<p><font face="Verdana" size="2">Recibido: 2-XI-2006.    <BR>Aceptado: 30-I-2007.</font></p>      ]]></body><back>
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