<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402006000800016</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síndrome X vs síndrome metabolico: Entendiendo sus coincidencias y sus diferencias hacia una "nueva cardiología"]]></article-title>
<article-title xml:lang="en"><![CDATA[Sindrome X vs metabolic syndrome]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Villegas]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Central Médico-Quirúrgica de Aguascalientes  ]]></institution>
<addr-line><![CDATA[Aguascalientes Aguascalientes]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>76</volume>
<fpage>173</fpage>
<lpage>188</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402006000800016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402006000800016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402006000800016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En 1939 Himsworth postuló que la diabetes mellitus tipo 2 (DM2) no sólo era secundaria a deficiencia de insulina sino también obedecía a insensibilidad celular a esta hormona. Treinta años después DeFronzo y Reaven demostraron secuencialmente que la resistencia a la insulina (Rl) antecedía y predisponía a la DM2 y a la enfermedad-cardiovascular-aterosclerosa (ECVA). Reaven, asoció la Rl con trastornos en la regulación glucémica, lipídica y tensional arterial, como los sustratos etiopatogénicos para la ECVA, creando el concepto de síndrome X (SX). Antecedido por la OMS, el ATP-III en el 2002, fundamentado en la imposibilidad clínica de diagnosticar Rl en forma sencilla, confiable y económica, propuso el concepto de síndrome metabolico (SM), como un conjunto de 5 variables que asociando a la obesidad visceral como el agente causal más frecuente de Rl, con las manifestaciones metabólicas más significativas de ésta, a saber hiperglucemia, hipertrigliceridemia, hipocolesterolemia-HDL e hipertensión arterial, permitiría al clínico una aproximación facilitada para sospechar y tratar un riesgo incrementado de DM2 y ECVA. A la fecha existen controversias extensas y profundas sobre este tema, mismas que sin embargo en realidad no existen, dado que son más bien de forma que de fondo. El por qué de la inexistencia real de dichas controversias es el eje principal de este artículo, cuyo objetivo es diferenciar y armonizar los conceptos SXy SM; analizar la fisiopatología que hace al SM una buena "ventana clínica" para ver hacia la Rl y sus manifestaciones subrogadas y comprender que el concepto SM, complementa no sustituye ni antagoniza a las escalas tradicionales para el cálculo del riesgo cardiovascular como la de Framingham.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Himsworth in 1939 postulated that Diabetes Mellitus type 2 (DM2) was not only an insulin deficiency state but also a cellular insulin insensitivity disease. Thirty years later, DeFronzo and Reaven demonstrated that insulin resistance (IR) preceded and predisposed for DM2 and atherosclerotic-cardiovascular-disease (ACVD). Reaven was the first to point out the relationship between IR and with hyperglycemia, dyslipidosis, and hypertension as mediators for ACVD, creating the concept of Syndrome X (SX) in 1988. WHO and, thereafter, other medical societies and medical groups, mainly ATP-III, in 2002, based on the difficulty of diagnosing IR in a simple, reliable, and inexpensive way, proposed and published the Metabolic Syndrome (MS) concept, as a group of five variables, i.e., obesity, hyperglycemia, hypertriglyceridemia, low HDL, and hypertension, as an easy clinical approximation to suspect and treat an increased cardiometabolic risk. Nowadays, there are deep and extensive controversies on this issue; however, these controversies do not really exist since all discordant points of view are rather quantitative and not qualitative in nature. This article is aimed at differentiating and harmonizing the complementary concepts of SX and MS, at analyzing why MS is a good "clinical window" to lookfor IR and its underlying manifestations, and finally to accept that the MS concept complements, but does not substitute or antagonize, traditional scales used to asses cardiovascular risk, such as the Framingham scale.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome X]]></kwd>
<kwd lng="es"><![CDATA[Síndrome metabolico]]></kwd>
<kwd lng="es"><![CDATA[Resistencia a la insulina]]></kwd>
<kwd lng="en"><![CDATA[Syndrome X]]></kwd>
<kwd lng="en"><![CDATA[Metabolic syndrome]]></kwd>
<kwd lng="en"><![CDATA[Insulin resistance]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4"> Investigaci&oacute;n Cl&iacute;nica</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><i><b>S&iacute;ndrome X vs s&iacute;ndrome metabolico: Entendiendo sus coincidencias y sus diferencias hacia una "nueva cardiolog&iacute;a"</b></i></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="3"><b>Sindrome X vs metabolic syndrome</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>Enrique Morales Villegas*</b></font></p>     <p align="center">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><i>* Director Centro de Investigaci&oacute;n Cardiometab&oacute;lica S.C. Hospital Central M&eacute;dico&#150;Quir&uacute;rgica de Aguascalientes.</i></font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia</b>:     <br>     <i>Dr. Enrique Morales Villegas.     <br>     Quinta Avenida N&uacute;m. 702&#150;210. Frac. Agricultura.    <br>     Aguascalientes 20230. Aguascalientes. M&eacute;xico.     <br>     Tel&eacute;fono 01&#150;449&#150;9782545. Fax 01&#150;449&#150;9715862. </i>    <br>     <b>Correo electr&oacute;nico:</b> <a href="mailto:drmorvi@prodigy.net.mx">drmorvi@prodigy.net.mx</a></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font size="2" face="verdana"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"> En 1939 Himsworth postul&oacute; que la diabetes mellitus tipo 2 (DM2) no s&oacute;lo era secundaria a deficiencia de insulina sino tambi&eacute;n obedec&iacute;a a insensibilidad celular a esta hormona. Treinta a&ntilde;os despu&eacute;s DeFronzo y Reaven demostraron secuencialmente que la resistencia a la insulina (Rl) anteced&iacute;a y predispon&iacute;a a la DM2 y a la enfermedad&#150;cardiovascular&#150;aterosclerosa (ECVA). Reaven, asoci&oacute; la Rl con trastornos en la regulaci&oacute;n gluc&eacute;mica, lip&iacute;dica y tensional arterial, como los sustratos etiopatog&eacute;nicos para la ECVA, creando el concepto de s&iacute;ndrome X (SX). Antecedido por la OMS, el ATP&#150;III en el 2002, fundamentado en la imposibilidad cl&iacute;nica de diagnosticar Rl en forma sencilla, confiable y econ&oacute;mica, propuso el concepto de s&iacute;ndrome metabolico (SM), como un conjunto de 5 variables que asociando a la obesidad visceral como el agente causal m&aacute;s frecuente de Rl, con las manifestaciones metab&oacute;licas m&aacute;s significativas de &eacute;sta, a saber hiperglucemia, hipertrigliceridemia, hipocolesterolemia&#150;HDL e hipertensi&oacute;n arterial, permitir&iacute;a al cl&iacute;nico una aproximaci&oacute;n facilitada para sospechar y tratar un riesgo incrementado de DM2 y ECVA. A la fecha existen controversias extensas y profundas sobre este tema, mismas que sin embargo en realidad no existen, dado que son m&aacute;s bien de forma que de fondo. El por qu&eacute; de la inexistencia real de dichas controversias es el eje principal de este art&iacute;culo, cuyo objetivo es diferenciar y armonizar los conceptos SXy SM; analizar la fisiopatolog&iacute;a que hace al SM una buena "ventana cl&iacute;nica" para ver hacia la Rl y sus manifestaciones subrogadas y comprender que el concepto SM, complementa no sustituye ni antagoniza a las escalas tradicionales para el c&aacute;lculo del riesgo cardiovascular como la de Framingham.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Palabras clave: </b>S&iacute;ndrome X. S&iacute;ndrome metabolico. Resistencia a la insulina.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2"> Himsworth in 1939 postulated that Diabetes Mellitus type 2 (DM2) was not only an insulin deficiency state but also a cellular insulin insensitivity disease. Thirty years later, DeFronzo and Reaven demonstrated that insulin resistance (IR) preceded and predisposed for DM2 and atherosclerotic&#150;cardiovascular&#150;disease (ACVD). Reaven was the first to point out the relationship between IR and with hyperglycemia, dyslipidosis, and hypertension as mediators for ACVD, creating the concept of Syndrome X (SX) in 1988. WHO and, thereafter, other medical societies and medical groups, mainly ATP&#150;III, in 2002, based on the difficulty of diagnosing IR in a simple, reliable, and inexpensive way, proposed and published the Metabolic Syndrome (MS) concept, as a group of five variables, i.e., obesity, hyperglycemia, hypertriglyceridemia, low HDL, and hypertension, as an easy clinical approximation to suspect and treat an increased cardiometabolic risk. Nowadays, there are deep and extensive controversies on this issue; however, these controversies do not really exist since all discordant points of view are rather quantitative and not qualitative in nature. This article is aimed at differentiating and harmonizing the complementary concepts of SX and MS, at analyzing why MS is a good "clinical window" to lookfor IR and its underlying manifestations, and finally to accept that the MS concept complements, but does not substitute or antagonize, traditional scales used to asses cardiovascular risk, such as the Framingham scale.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Key words: </b>Syndrome X. Metabolic syndrome. Insulin resistance.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2"> El SX fue descrito por Reaven sobre la base de evidencias previas del papel etiopatog&eacute;nico de la RI en la DM2.<sup>1</sup> Dicho autor postul&oacute; por primera vez, que la RI era un trastorno fisiopatol&oacute;gico que determinaba un riesgo mayor al promedio de desarrollar no s&oacute;lo DM2, sino tambi&eacute;n ECVA. Lo anterior, a trav&eacute;s de la existencia de 3 alteraciones subrogadas a la RI, a saber: disregulaci&oacute;n gluc&eacute;mica, disregulaci&oacute;n lip&iacute;dica y disregulaci&oacute;n hemodin&aacute;mica. As&iacute; Reaven propuso y mantiene la propuesta de que la RI y la hiperinsulinemia secundaria, son el sustrato para el desarrollo de hiperglucemia, hipertrigliceridemia con HDL bajo e hipertensi&oacute;n arterial, y que por medio de dichas alteraciones se explica el riesgo incrementado de ECVA y DM2.<sup>2&#150;</sup><sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2"> El ATP&#150;III en el a&ntilde;o 2002, denomin&oacute; s&iacute;ndrome metab&oacute;lico a la reuni&oacute;n en un mismo individuo de al menos 3 de 5 variables antropom&eacute;tricas, hemodin&aacute;micas y bioqu&iacute;micas que al aglutinarse con una frecuencia mayor a la esperable por el azar, traduc&iacute;an una alta posibilidad de RI y por ende un riesgo elevado para DM2 y ECVA.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Esta intenci&oacute;n del ATP&#150;III por hacer accesible al cl&iacute;nico una "f&oacute;rmula" que permitiera la f&aacute;cil predicci&oacute;n de un riesgo cardiometab&oacute;lico incrementado, llev&oacute; impl&iacute;cita una sobresimplificaci&oacute;n del concepto con obvios y ahora muy controvertidos aspectos en favor y en contra.<sup>7,8</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La principal virtud de la propuesta del ATP&#150;III, fue haber despertado la conciencia de que existe un estado subcl&iacute;nico con riesgo cardiometab&oacute;lico mayor al promedio, cuya detecci&oacute;n y correcci&oacute;n es ben&eacute;fica en la gran masa de individuos en quienes hasta hace poco tiempo no se consideraba necesaria alguna intervenci&oacute;n m&eacute;dica.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> Los aspectos m&aacute;s controvertidos sobre el concepto del SM propuesto por el ATP&#150;III e impl&iacute;citos en su simplicidad, han sido varios,<sup>7,8</sup> entre ellos, los siguientes:</font></p>     <p align="justify"><font face="verdana" size="2"> 1. Su definici&oacute;n incluy&oacute; como variable diagn&oacute;stica, al factor etiol&oacute;gico m&aacute;s importante de la RI que es la obesidad visceral, conjunt&aacute;ndola con variables que son la consecuencia de la RI (hiperglucemia, hipertrigliceridemia hipoalfalipoproteinemia e hipertensi&oacute;n arterial. En otras palabras, se incluy&oacute; parte de lo determinado en la definici&oacute;n. Esta observaci&oacute;n si bien es v&aacute;lida, tambi&eacute;n es sem&aacute;ntica y ha de interpretarse en el conocimiento de que la definici&oacute;n del SM por el ATP&#150;III &#150;entre l&iacute;neas&#150;, debe ser valorada como un sistema diagn&oacute;stico de aplicaci&oacute;n cl&iacute;nica que amalgama en un continuo, a la obesidad, como el agente causal m&aacute;s importante de RI, y a los subrogados de &eacute;sta, como los implicados directos en el incremento del riesgo de DM2 y aterotrombosis.</font></p>     <p align="justify"><font face="verdana" size="2"> 2.&nbsp; La obesidad visceral no implica en el 100% de los casos un estado de RI de la suficiente magnitud para considerarse de riesgo metab&oacute;lico y/o cardiovascular. Si bien ello es cierto, como se abundar&aacute; en el art&iacute;culo, tambi&eacute;n lo es que, si la RI se midiera con sencillez, confiabilidad y econom&iacute;a, no se recurrir&iacute;a a inferencias cl&iacute;nicas.</font></p>     <p align="justify"><font face="verdana" size="2"> 3.&nbsp; El n&uacute;mero de variables necesarias para establecer el diagn&oacute;stico, el tipo de variables en funci&oacute;n de su sensibilidad y especificidad y los puntos de corte &oacute;ptimos de cada variable en cada poblaci&oacute;n, tambi&eacute;n son aspectos de controversia.</font></p>     <p align="justify"><font face="verdana" size="2"> A pesar de los contrapuntos m&aacute;s bien de forma que de fondo con relaci&oacute;n al s&iacute;ndrome metab&oacute;lico, es indudable que algo debemos hacer los cardi&oacute;logos por abordar el problema epid&eacute;mico de la obesidad visceral causado a su vez por nuestro ambiente obesog&eacute;nico, determinante de inflamaci&oacute;n, RI y disfunci&oacute;n endotelial como plataforma del letal incremento en la prevalencia de DM2 y ECVA.</font></p>     <p align="justify"><font face="verdana" size="2"> Lo anterior justifica este art&iacute;culo en el cual se abordar&aacute;n los siguientes t&oacute;picos:</font></p>     <p align="justify"><font face="verdana" size="2"> 1.&nbsp; La regulaci&oacute;n del ciclo apetito&#150;saciedad y las consecuencias de la comida r&aacute;pida sobre &eacute;l, como la causa principal de obesidad visceral.</font></p>     <p align="justify"><font face="verdana" size="2"> 2.&nbsp; S&iacute;ndrome X o s&iacute;ndrome metab&oacute;lico. Disfunci&oacute;n adipocitaria y adipotoxicidad como detonantes de la insensibilidad o resistencia a la insulina, la inflamaci&oacute;n, la disfunci&oacute;n endotelial y la apoptosis de la c&eacute;lula beta pancre&aacute;tica.</font></p>     <p align="justify"><font face="verdana" size="2"> 3.&nbsp; El nexo etiopatog&eacute;nico entre la RI y la disfunci&oacute;n endotelial como trastorno premonitorio de aterotrombosis.</font></p>     <p align="justify"><font face="verdana" size="2"> Esta cadena de eventos perfila una nueva etio, anatomo y fisiopatolog&iacute;a para la cardiolog&iacute;a, mismas que los cardi&oacute;logos hemos de dominar: desde&ntilde;arla, como en su tiempo sucedi&oacute; con los factores de riesgo cl&aacute;sicos quiz&aacute; no sea el mejor camino para la salud de nuestro pa&iacute;s.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Fisiolog&iacute;a del apetito y la saciedad</b></font></p>     <p align="justify"><font face="verdana" size="2"> Dado que nuestro organismo es una maquinaria de combusti&oacute;n interna y requiere el consumo de alimentos como fuente de energ&iacute;a para compensar su entrop&iacute;a &#150;tendencia al desorden interno&#150;la sensaci&oacute;n de apetito es vital para inducir la ingesta de aqu&eacute;llos en forma de carbohidratos, grasas y prote&iacute;nas.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Los dos primeros son las principales fuentes de energ&iacute;a ya que a trav&eacute;s de la gluc&oacute;lisis y la betaoxidaci&oacute;n son trasformados en acetylCoA. Esta &uacute;ltima es incorporada al ciclo del &aacute;cido tricarbox&iacute;lico y posteriormente al proceso de la fosforilaci&oacute;n oxidativa para la generaci&oacute;n de fosfatos de alta energ&iacute;a o ATP, mol&eacute;cula que es la "moneda" energ&eacute;tica de nuestro organismo.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La sensaci&oacute;n opuesta al apetito es la saciedad y ella, es inducida una vez que los requerimientos energ&eacute;ticos del organismo han sido satisfechos. De otra forma, la sensaci&oacute;n de apetito ser&iacute;a perenne.</font></p>     <p align="justify"><font face="verdana" size="2"> El balance entre los estados de apetito y saciedad, est&aacute; regulado por el hipot&aacute;lamo y su ruptura puede inducir estados de obesidad o de caquexia. El hipot&aacute;lamo ventromedial recibe por v&iacute;a endocrina &#150;asa aferente&#150;, la informaci&oacute;n perif&eacute;rica sobre el balance energ&eacute;tico. Dicha informaci&oacute;n es procesada en los n&uacute;cleos hipotal&aacute;micos, periventricular y lateral y emite por v&iacute;a paracrina &#150;asa intra&#150;hipotal&aacute;mica&#150;, informaci&oacute;n a otras zonas del hipot&aacute;lamo, al sistema l&iacute;mbico y/o al sistema nervioso perif&eacute;rico con el fin de equilibrar el estado energ&eacute;tico de nuestro organismo &#150;asa eferente&#150;.<sup>10,11</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Asa aferente orexig&eacute;nica. Un balance energ&eacute;tico negativo por ayuno, induce la s&iacute;ntesis y secreci&oacute;n de ghrelina por las c&eacute;lulas "A like" del est&oacute;mago. Esta hormona alcanza su acm&eacute; al inicio de la ingesta alimenticia y declina en el transcurso de la misma.<sup>12</sup> Por v&iacute;a endocrina estimula a los receptores de hormona de crecimiento en el n&uacute;cleo ventromedial y con ello la s&iacute;ntesis y secreci&oacute;n de Neuro&#150;Peptide&#150;Y o NPY y A&#150;Gouty&#150;Related&#150;Peptide o AGRP, ambas mol&eacute;culas por v&iacute;a paracrina estimulan a los receptores de melanocortina 3 y 4 del n&uacute;cleo paraventricular y con ello la sensaci&oacute;n de apetito. A partir de la estimulaci&oacute;n del n&uacute;cleo paraventricular y a trav&eacute;s del n&uacute;cleo motor&#150;dorsal se activa el parasimp&aacute;tico y con ello fen&oacute;menos perif&eacute;ricos de dep&oacute;sito de energ&iacute;a y reducci&oacute;n del gasto energ&eacute;tico en reposo, equilibrando as&iacute; el balance energ&eacute;tico negativo que dispar&oacute; dicha v&iacute;a <i><a href="#f1">(Fig. 1)</a>.</i></font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> <i>V&iacute;a </i>aferente anorexig&eacute;nica. Un balance energ&eacute;tico positivo por la ingesta aguda y/o cr&oacute;nica de alimentos, induce la s&iacute;ntesis y secreci&oacute;n de insulina y leptina.</font></p>     <p align="justify"><font face="verdana" size="2"> La leptina es una hormona sintetizada y secretada por el adipocito.<sup>13</sup> Su s&iacute;ntesis y secreci&oacute;n son estimuladas principalmente por la insulina. Alcanza su pico m&aacute;ximo cuando el dep&oacute;sito adipocitario de triglic&eacute;ridos es suficiente y declina con el ayuno prolongado. Por v&iacute;a endocrina cruza la barrera hemato&#150;encef&aacute;lica, estimula a los receptores "Cytokine&#150;Kinase&#150;2" o CK2 en el n&uacute;cleo ventromedial y con ello la s&iacute;ntesis y secreci&oacute;n de "Melanocite&#150;Stimulating&#150;Hormone" o MSH y "Cocaine&#150;Amphetamin&#150;Regulated&#150;Transcript" o CART, estas mol&eacute;culas por v&iacute;a paracrina estimulan a los receptores de melanocortina 3 y 4 del n&uacute;cleo lateral y as&iacute; la sensaci&oacute;n anorex&iacute;gena de saciedad. En conjunto al efecto anterior, estimula en el sistema l&iacute;mbico la recaptura de dopamina, bloqueando la sensaci&oacute;n hed&oacute;nica del comer<sup>14&#150;</sup><sup>16</sup> y a trav&eacute;s del n&uacute;cleo cer&uacute;leo se activa el simp&aacute;tico y con ello fen&oacute;menos perif&eacute;ricos de incremento del gasto energ&eacute;tico en reposo, equilibrando el balance energ&eacute;tico positivo en el mediano y largo plazo<sup>17&#150;19</sup> <i><a href="#f1">(Fig. 1)</a>.</i></font></p>     <p align="justify"><font face="verdana" size="2"> La insulina es una hormona sintetizada y secretada por la c&eacute;lula pancre&aacute;tica beta. Su s&iacute;ntesis y secreci&oacute;n son estimuladas por las incretinas (hormonas gastrointestinales) "Glucosa&#150;Dependent&#150;Insulino&#150;thropic&#150;Polypeptide" o GDIP, "Gastric&#150;Inhibitory&#150;Polypeptide" o GIP y "Glucagon&#150;Like&#150;Polypeptide&#150;1" o GLP1,<sup>20</sup><sup>,21</sup> alcanza su nivel m&aacute;ximo con la ingesta de disac&aacute;ridos, especialmente sucrosa, y declina con el ayuno, a&uacute;n siendo breve. Por v&iacute;a endocrina, al igual que la leptina, cruza la barrera hematoencef&aacute;lica, estimula a los receptores espec&iacute;ficos de insulina en el n&uacute;cleo ventromedial y con ello la s&iacute;ntesis y secreci&oacute;n de MSH y CART, la activaci&oacute;n de receptores melanocortina 3 y 4 del n&uacute;cleo lateral y la saciedad. En forma tambi&eacute;n similar a la leptina, bloquea la sensaci&oacute;n hed&oacute;nica del comer e incrementa, v&iacute;a simp&aacute;tica el gasto energ&eacute;tico en reposo, equilibrando el balance energ&eacute;tico positivo en el corto plazo<sup>22&#150;25 </sup><a href="#f1"><i>(Fig. 1)</i></a><i>.</i></font></p>     <p align="justify"><font face="verdana" size="2"> La acci&oacute;n de la insulina y la leptina se complementan, la primera equilibra el balance energ&eacute;tico positivo en el corto plazo y estimula la s&iacute;ntesis y producci&oacute;n de la segunda para mantener dicho equilibrio en el mediano y largo plazo.</font></p>     <p align="justify"><font face="verdana" size="2"> Es importante destacar que si bien la ingesta alimenticia es estimulada predominantemente por un balance energ&eacute;tico negativo, ella tambi&eacute;n puede ser estimulada por la activaci&oacute;n del sistema l&iacute;mbico. Una sensaci&oacute;n gratificante, hed&oacute;nica o placentera de un alimento paladeable, activa una respuesta orexig&eacute;nica, independiente a la despertada por el balance energ&eacute;tico negativo.</font></p>     <p align="justify"><font face="verdana" size="2"> Est&iacute;mulos como el fr&iacute;o, el estr&eacute;s y el ayuno forzado implican un balance energ&eacute;tico negativo por aumento del gasto o por deficiencia del aporte de energ&iacute;a. Para mantener el balance energ&eacute;tico, el organismo consume los dep&oacute;sitos de energ&iacute;a acumulados en forma de gluc&oacute;geno y/o triglic&eacute;ridos. Este proceso es mediado por la activaci&oacute;n eferente del sistema simp&aacute;tico a partir del n&uacute;cleo cer&uacute;leo. As&iacute;, se estimula la glucogen&oacute;lisis y la lip&oacute;lisis por los siguientes mecanismos: S&iacute;ntesis y secreci&oacute;n de glucag&oacute;n, TSH y hormonas tiroideas, incremento del flujo sangu&iacute;neo muscular esquel&eacute;tico y activaci&oacute;n de los receptores beta&#150;3 adipocitarios.<sup>26</sup></font></p>     <p align="justify"><font face="verdana" size="2"> En contraparte, la ingesta de sustratos energ&eacute;ticos como la glucosa y las grasas, determinan un balance energ&eacute;tico positivo por exceso del aporte de energ&iacute;a. Para mantener neutral el balance energ&eacute;tico, el organismo en una primera fase activa al asa aferente anorexig&eacute;nica y a la eferente simp&aacute;tica leptino&#150;insulino dependiente (perif&eacute;rica&#150;neural). Sin embargo, si el balance energ&eacute;tico positivo se torna cr&oacute;nico y/o excesivo y los niveles de glucosa y &aacute;cidos grasos libres plasm&aacute;ticos no pueden mantenerse en l&iacute;mites fisiol&oacute;gicos a trav&eacute;s de una reducci&oacute;n en la ingesta y/o el incremento del gasto energ&eacute;tico, el sistema parasimp&aacute;tico a trav&eacute;s del n&uacute;cleo motor dorsal estimular&aacute; la s&iacute;ntesis de insulina, hormona que en su asa eferente (neural&#150;perif&eacute;rica), inducir&aacute; hasta cierto l&iacute;mite, la captaci&oacute;n de glucosa y AGL en el hepatocito y en el adipocito respectivamente por medio de la activaci&oacute;n de la glucogenog&eacute;nesis y la lipog&eacute;nesis con la inhibici&oacute;n de la gluconeog&eacute;nesis y la lip&oacute;lisis.<sup>27</sup></font></p>     <p align="justify"><font face="verdana" size="2"> En conclusi&oacute;n, nuestro balance energ&eacute;tico se mantiene en un fino equilibrio gracias a la neurorregulaci&oacute;n sobre los mecanismos de apetito saciedad, placer&#150;ausencia de placer por paladear y ahorro&#150;gasto de energ&iacute;a. Cuando este equilibrio se distorsiona aparecen dos trastornos polares, la obesidad y la caquexia, sobre el primero y su asociaci&oacute;n con la comida r&aacute;pida se ocupa el siguiente apartado.</font></p>     <p align="justify"><font face="verdana" size="2"> Comida r&aacute;pida como causa principal de obesidad visceral</font></p>     <p align="justify"><font face="verdana" size="2"> El consumo de comida r&aacute;pida es obesog&eacute;nica por las siguientes caracter&iacute;sticas:<sup>10</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> 1.&nbsp; Alta densidad energ&eacute;tica.</font></p>     <p align="justify"><font face="verdana" size="2"> 2.&nbsp; Alto contenido de grasa.</font></p>     <p align="justify"><font face="verdana" size="2"> 3.&nbsp; Alto &iacute;ndice&#150;carga gluc&eacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2"> 4.&nbsp; Efecto fructuosa.</font></p>     <p align="justify"><font face="verdana" size="2"> 5.&nbsp; Bajo contenido de fibra.</font></p>     <p align="justify"><font face="verdana" size="2"> 6.&nbsp; Bajo contenido de calcio.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Alta densidad energ&eacute;tica. </b>El contenido de energ&iacute;a por gramo de alimento, define a la densidad energ&eacute;tica. El alto contenido de carbohidratos y grasas y el bajo de fibra, determinan que la comida r&aacute;pida sea energ&eacute;ticamente densa. Una dieta tradicional nativa tiene una densidad energ&eacute;tica de 450 kJ por 100 g, mientras que su equivalente en gramos de comida r&aacute;pida aporta en promedio 1,100 kJ.<sup>28</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Dado que el consumo alimenticio humano se rige en forma consciente m&aacute;s por el volumen y peso de un alimento que por su contenido energ&eacute;tico, el consumo cr&oacute;nico de alimentos de alta densidad energ&eacute;tica ocasiona un balance energ&eacute;tico positivo que generalmente no es compensado ni al corto ni al largo plazo.<sup>29,30</sup> Este fen&oacute;meno sucede por dos mecanismos. El primero, porque generalmente no llevamos a la conciencia el contenido energ&eacute;tico de los alimentos y el segundo y m&aacute;s importante es, que la comida r&aacute;pida, tiene la capacidad de estimular el apetito y la ingesta, v&iacute;a el sistema l&iacute;mbico, independientemente del alto valor energ&eacute;tico del alimento.<sup>31</sup></font></p>     <p align="justify"><font face="verdana" size="2"> <b>Alto contenido de grasa. </b>La ingesta de grasa por su alto valor energ&eacute;tico es un predictor independiente de obesidad y la comida r&aacute;pida aporta un alto contenido de grasa saturada. La ingesta de grasa potencia el efecto insulinotr&oacute;pico de la ingesta de carbohidratos. Este hecho genera hiperinsulinemia compensadora con lipog&eacute;nesis en el corto plazo e hiperinsulinemia no compensadora por resistencia a la insulina y lip&oacute;lisis en el largo plazo.<sup>32&#150;34</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> Los AGL no saturados (&aacute;cido linoleico y eicosapentanoico), son est&iacute;mulos potentes para la secreci&oacute;n y sensibilizaci&oacute;n de y a la insulina,<sup>35&#150;37 </sup>sin embargo los AGL saturados (laurato y palmitato), si bien inducen s&iacute;ntesis y secreci&oacute;n insul&iacute;nica, tambi&eacute;n provocan resistencia celular a la hormona por interferir con la acci&oacute;n de su principal enzima orquestadora intracelular, la PI3K o "Phosphatidil&#150;Inositol&#150;3&#150;Kinase".<sup>38,39</sup> Este fen&oacute;meno no s&oacute;lo provoca RI en las c&eacute;lulas del eje metab&oacute;lico y en las c&eacute;lulas endoteliales, tambi&eacute;n provoca inhibici&oacute;n del efecto aferente (perif&eacute;rico&#150;neural) de la insulina y la leptina sobre el n&uacute;cleo ventromedial y por ende bloquea sus se&ntilde;ales anorexig&eacute;nicas, antihed&oacute;nicas e incrementadoras del gasto energ&eacute;tico de reposo.<sup>40,41</sup></font></p>     <p align="justify"><font face="verdana" size="2"> <b>Alto &iacute;ndice y carga gluc&eacute;mica. </b>La comida r&aacute;pida se caracteriza por una alta proporci&oacute;n de alimentos con un elevado &iacute;ndice gluc&eacute;mico y por ende altas cargas gluc&eacute;micas.<sup>42</sup> El &iacute;ndice gluc&eacute;mico es inversamente proporcional al tama&ntilde;o del sac&aacute;rido y al contenido de fibra y se define como el &aacute;rea bajo la curva de glucemia en una prueba de tolerancia oral con una carga de un alimento dado, comparada con la de una carga equivalente en gramos de glucosa.<sup>43,44</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Como ya se anot&oacute;, la carga gluc&eacute;mica de un alimento es el principal determinante de la s&iacute;ntesis y secreci&oacute;n de insulina &#150;demanda insul&iacute;nica&#150; y con ello de la glucogenog&eacute;nesis y la lipog&eacute;nesis. En situaciones de s&iacute;ntesis, secreci&oacute;n y sensibilidad a la insulina normales, la ingesta de un alimento con alta carga gluc&eacute;mica induce una fase hipergluc&eacute;mica r&aacute;pidamente compensada, seguida de una fase de hipoglucemia relativa inductora de apetito y de reingesta. Lo anterior favorece un ciclo intermitente con intervalos de 4 a 6 horas de glucogenog&eacute;nesis y lipog&eacute;nesis. En paralelo se ha demostrado que los alimentos con alta carga gluc&eacute;mica se asocian a un apetito incrementado, una saciedad disminuida, un incremento en el consumo alimentario voluntario "hed&oacute;nico" y una reducci&oacute;n en el gasto energ&eacute;tico de reposo.<sup>45,46</sup> A largo plazo, las altas cargas gluc&eacute;micas son diabetog&eacute;nicas por mecanismos de glucotoxicidad, lipotoxicidad y sobredemanda insul&iacute;nica con falla 2<sup>a</sup> de la c&eacute;lula beta.<sup>47,48</sup></font></p>     <p align="justify"><font face="verdana" size="2"> <b>Efecto fructuosa. </b>El az&uacute;car de mesa es un disac&aacute;rido que contiene 50% de glucosa y 50% de fructuosa. Sin embargo, el edulcorante usado predominantemente en la preparaci&oacute;n de comida r&aacute;pida es el jarabe derivado de ma&iacute;z el cual tiene una mayor concentraci&oacute;n de fructuosa y es m&aacute;s econ&oacute;mico que el az&uacute;car normal. La fructuosa independientemente de su carga energ&eacute;tica, est&aacute; asociada a obesidad y diabetog&eacute;nesis por los siguientes mecanismos.<sup>49,50</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La absorci&oacute;n intestinal y la captaci&oacute;n celular de fructuosa est&aacute;n mediadas por los trasportadores de membrana tipo Glut&#150;5, los cuales tienen una alta densidad en el enterocito y en el hepatocito y baja en el miocito esquel&eacute;tico y en el adipocito. En el citoplasma del hepatocito, la fructuosa es convertida en fructuosa 1&#150;6 fosfato y a diferencia de la glucosa, se incorpora al ciclo de la gluc&oacute;lisis m&aacute;s all&aacute; del paso regulatorio inhibidor determinado por la fosfofructoquinasa. Normalmente el acumulo de productos finales de la gluc&oacute;lisis (NADPH, ATP y piruvato) regula a la baja la actividad de la fosfofructoquinasa y con ello se inhibe esta v&iacute;a generadora de piruvato. Este "switch" no es activado por la incorporaci&oacute;n de la fructuosa a la gluc&oacute;lisis y por ende existe un exceso de productos terminales e intermedios de la gluc&oacute;lisis. Al existir un exceso de piruvato, se generar&aacute; un incremento en la concentraci&oacute;n de acylCoA derivado de la gluc&oacute;lisis y se inhibe la incorporaci&oacute;n de AGL al proceso de la betaoxidaci&oacute;n. Este fen&oacute;meno de acumulo de AGL en conjunto con el incremento de glicerol (producto intermedio de la gluc&oacute;lisis) aumenta el sustrato para la s&iacute;ntesis de triglic&eacute;ridos y lipoprote&iacute;nas ricas en ellos o VLDL.<sup>51</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La fructuosa tiene una capacidad menor a la de la glucosa para inhibir la s&iacute;ntesis y secreci&oacute;n de ghrelina, as&iacute; como para estimular las de insulina y leptina por lo cual determina en gran parte la incapacidad de la comida r&aacute;pida de inhibir el apetito y activar la saciedad.<sup>52,53</sup></font></p>     <p align="justify"><font face="verdana" size="2"> <b>Bajo contenido de fibra. </b>La comida r&aacute;pida se caracteriza por un bajo contenido de fibra. El contenido de fibra en la alimentaci&oacute;n tiene una relaci&oacute;n inversa con la incidencia de obesidad, hiperinsulinemia, RI y DM2.<sup>54</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Dado que la fibra est&aacute; constituida por celulosa (polisac&aacute;rido de glucosa contenido en la estructura de plantas), la ingesta de un alto contenido de fibra determina: menor &iacute;ndice&#150;carga gluc&eacute;mica y menor densidad energ&eacute;tica; mayor sensaci&oacute;n de saciedad; mayor tiempo de vaciamiento g&aacute;strico y de absorci&oacute;n de glucosa. Por lo anterior, la demanda insul&iacute;nica tras la ingesta de fibra es un proceso m&aacute;s fisiol&oacute;gico, reduciendo con ello la hiperinsulinemia y sus consecuencias. La fibra tambi&eacute;n "arrastra" hacia el colon los AGL contenidos en los alimentos, all&iacute; los AGL son fermentados y convertidos en AGL de cadena corta, los cuales a diferencia de los de cadena larga, incrementan la sensibilidad a la insulina.<sup>55</sup></font></p>     <p align="justify"><font face="verdana" size="2"> <b>Bajo contenido l&aacute;cteo. </b>La comida r&aacute;pida es baja en calcio. La ingesta de productos l&aacute;cteos se ha asociado a una reducci&oacute;n en la incidencia de obesidad y de RI, muy probablemente por su alto contenido de calcio. Los mecanismos para explicar dicho fen&oacute;meno ben&eacute;fico son al menos los 3 siguientes:<sup>56&#150;58</sup> bajo &iacute;ndice&#150;carga gluc&eacute;mica; incremento en la excreci&oacute;n fecal de grasa y reducci&oacute;n de la lipog&eacute;nesis con incremento de la lip&oacute;lisis por reducir la concentraci&oacute;n de vitamina D&#150;3.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> <b>S&iacute;ndrome X o s&iacute;ndrome metab&oacute;lico     <br> "dos ventanas a la RI"</b></font></p>     <p align="justify"><font face="verdana" size="2"> La primera descripci&oacute;n de que la DM2 no s&oacute;lo era un estado de deficiencia insul&iacute;nica, sino tambi&eacute;n un estado de insensibilidad a la insulina fue hecha por Harold Himsworth en 1939.<sup>59&#150;62 </sup>Sin embargo, fue hasta los a&ntilde;os 70 con el advenimiento de las t&eacute;cnicas para cuantificar la captaci&oacute;n celular de glucosa mediada por insulina, cuando la hip&oacute;tesis planteada 30 a&ntilde;os antes por Himsworth empez&oacute; a tener eco.<sup>63&#150;66</sup> Dicha hip&oacute;tesis se confirm&oacute; en los 80, cuando se demostr&oacute; en estudios cl&iacute;nico&#150;epidemiol&oacute;gicos que la RI preced&iacute;a e incrementaba el riesgo de DM2.<sup>66,68</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Gerald Reaven fue el primer investigador en "ir m&aacute;s all&aacute;" en el estudio de la RI. Reaven demostr&oacute;, que un porcentaje de individuos con RI evolucionaba progresivamente hacia DM2 y en el resto, la hiperinsulinemia 2<sup>a</sup>, permit&iacute;a mantener los niveles de glucemia en l&iacute;mite normal, durante lapsos variables.<sup>69</sup> Sin embargo, lo que &eacute;l llam&oacute; la respuesta "filantr&oacute;pica" de la c&eacute;lula beta, es decir, la hipers&iacute;ntesis e hipersecreci&oacute;n de insulina con hiperinsulinemia 2<sup>a</sup>, tendr&iacute;a un costo traducido por el desarrollo de disglucemia, dislipidemia y desregulaci&oacute;n hemodin&aacute;mica. A este conjunto fi&#150;siopatol&oacute;gico de RI, hiperinsulinemia y sus subrogados hemodin&aacute;mico&#150;metab&oacute;licos, Reaven lo denomin&oacute; a finales de los 80, s&iacute;ndrome X.</font></p>     <p align="justify"><font face="verdana" size="2">  Este concepto ha trascendido por haber sido el origen de una noci&oacute;n integradora entre la RI y el riesgo cardiovascular, asociaci&oacute;n etiopatog&eacute;nica que fue y contin&uacute;a siendo corroborada<sup>70&#150;73</sup> <i><a href="#f2">(Fig. 2)</a>.</i></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> As&iacute;, con esta breve rese&ntilde;a del nacimiento del concepto de s&iacute;ndrome X, se denota como la RI fue una condici&oacute;n inicialmente ligada al riesgo diabetog&eacute;nico, para posteriormente constituirse como una alteraci&oacute;n tambi&eacute;n ligada con el riesgo aterotrombog&eacute;nico.</font></p>     <p align="justify"><font face="verdana" size="2"> Por otra parte, como ya fue referido en la introducci&oacute;n, el s&iacute;ndrome metab&oacute;lico fue concebido como un concepto diagn&oacute;stico cl&iacute;nico, dominado por la obesidad visceral como la causa m&aacute;s frecuente e importante en nuestro tiempo de RI y por ende con una asociaci&oacute;n causal con intolerancia a la glucosa, dislipidemia aterog&eacute;nica e hipertensi&oacute;n arterial y por lo tanto con un riesgo incrementado de DM2 y ECVA.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> Aqu&iacute; vale la pena reiterar que, el s&iacute;ndrome X y el s&iacute;ndrome metab&oacute;lico no son t&eacute;rminos equivalentes o intercambiables, el primero no incluye a la obesidad como criterio diagn&oacute;stico, s&oacute;lo lo contempla como una condici&oacute;n predisponente de RI. Si puntualizamos esta diferencia se entiende la inexistente discrepancia entre los conceptos s&iacute;ndrome X y s&iacute;ndrome metab&oacute;lico (ATP&#150;III) puesto que, la existencia de RI como alteraci&oacute;n fisiopatol&oacute;gica, no necesariamente es secundaria a obesidad visceral y por lo tanto podr&aacute; existir RI sin obesidad visceral y viceversa, obesidad visceral sin RI.<sup>74&#150;76</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Esto &uacute;ltimo es fundamental puesto que aquel individuo obeso sin RI no manifestar&aacute; un incremento en el riesgo de DM2 y/o ECVA por este mecanismo, explicando as&iacute; la tan controversial validez diagn&oacute;stica de la obesidad visceral como predictor "absoluto" de RI y de sus subrogados. A pesar de ello, el concepto central del SM es que la obesidad visceral debe considerarse como la "ventana cl&iacute;nica" m&aacute;s &uacute;til para sospechar la existencia de RI y obliga al cl&iacute;nico a la b&uacute;squeda de sus manifestaciones metab&oacute;licas y hemodin&aacute;micas, predisponentes para evolucionar hacia DM2 y/o ECVA.<sup>77,78</sup></font></p>     <p align="justify"><font face="verdana" size="2"> A la fecha queda claro que no se requiere la reuni&oacute;n de 3 de 5 criterios para sospechar un incremento en el riesgo cardiometab&oacute;lico. La sola presencia de 1 criterio diagn&oacute;stico aumenta el riesgo de DM2 y/o ECVA, siendo m&aacute;ximo con la conjunci&oacute;n de 5 criterios. As&iacute; mismo est&aacute; publicado que la existencia de intolerancia a la glucosa de ayuno o postprandial es una variable con polaridad hacia el desarrollo de DM2, en tanto que la hipertensi&oacute;n arterial y la hipertrigliceridemia&#150;hipoalfalipoproteinemia la tienen hacia la ECVA.<sup>79,80</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Luego entonces, el SM no es una condici&oacute;n diagn&oacute;stica de todo o nada, como todo fen&oacute;meno biol&oacute;gico es un continuo, en el cual independientemente de la clasificaci&oacute;n, impera el concepto de que la obesidad visceral es el principal promotor occidental de RI y de sus alteraciones sat&eacute;lites, mediadoras del incremento en el riesgo cardiometab&oacute;lico.<sup>81</sup> Lo anterior sin olvidar que la RI determina otras patolog&iacute;as no menos importantes, especialmente, s&iacute;ndrome de ovarios poliqu&iacute;sticos, hepatopat&iacute;a grasa no alcoh&oacute;lica, ciertos c&aacute;nceres, s&iacute;ndrome de apnea del sue&ntilde;o y otras condiciones m&oacute;rbidas.<sup>82&#150;84</sup></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Por qu&eacute; la obesidad visceral genera RI y es su etiolog&iacute;a m&aacute;s frecuente</b></font></p>     <p align="justify"><font face="verdana" size="2"> Como ya fue revisado, la ingesta de comida denominada r&aacute;pida en combinaci&oacute;n con el sedentarismo es la principal causa de obesidad visceral. La obesidad visceral a su vez es el reflejo de la hipertrofia e hiperplasia del tejido adiposo intraabdominal. Dichos cambios en el tejido adipocitario son una manifestaci&oacute;n amplificada de su papel funcional que es captar AGL, reconstituirlos en forma de triglic&eacute;ridos y en su caso hidrolizar &eacute;stos para la liberaci&oacute;n de AGL como fuente energ&eacute;tica.<sup>9</sup> Dicha transformaci&oacute;n celular tiene un l&iacute;mite y un costo funcional.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Tejido adiposo disfuncional <i><a href="#f3">(Fig. 3)</a></i></b></font></p>     <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> Los adipocitos hipertr&oacute;ficos&#150;hiperpl&aacute;sicos tienen una menor densidad de receptores para insulina y una mayor de receptores beta&#150;3 adren&eacute;rgicos. Este hecho condiciona una tasa de lip&oacute;lisis incrementada que facilita como se ver&aacute; adelante, la diap&eacute;desis de monocitos hacia el estroma adiposo visceral, iniciando un ciclo proinflamatorio entre los adipocitos y los monocitos, inicialmente con repercusi&oacute;n local y finalmente sist&eacute;mica.<sup>85&#150;87</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Los AGL generados por los adipocitos viscerales son ligandos que por v&iacute;a paracrina estimulan a los receptores TLR o "Tool&#150;Like&#150;Receptors" de los monocitos normalmente localizados en el estroma adiposo visceral. La estimulaci&oacute;n de dichos receptores activa a los sistemas de se&ntilde;alizaci&oacute;n intracelular ERK o "Extracellular&#150;signal&#150;Regulated&#150;Kinase" y JK o "Janus&#150;Kinase" del monocito y con ello la actividad de la prote&iacute;na reguladora de genes AP&#150;1 o "Activated&#150; Protein &#150;1", induciendo la promoci&oacute;n de transcripci&oacute;n y s&iacute;ntesis de TNF&#150;alfa o "Tumor&#150;Necrosis&#150;Factor&#150;alfa" e IL&#150;6 o "Interleukin&#150;6". El TNF&#150;alfa y la IL&#150;6, especialmente el primero, a su vez son ligandos que tambi&eacute;n por v&iacute;a paracrina estimulan los receptores para TNF&#150;1&#150;2, entonces ya expresados por el adipocito disfuncional. La estimulaci&oacute;n de dichos receptores activa los sistemas ERK, JK y p38K o "p&#150;38&#150;Kinase" del adipocito y con ello la actividad de la AP&#150;1 con promoci&oacute;n de transcripci&oacute;n y s&iacute;ntesis de MCP&#150;1 o "Monocyte&#150;Chemoatractant&#150;Protein&#150;1" e IL6 con incremento de la migraci&oacute;n de monocitos al estroma adiposo visceral. El TNF&#150;alfa incrementa a&uacute;n m&aacute;s la resistencia celular del adipocito a la insulina por 2 mecanismos. El primero es por transfosforilaci&oacute;n directa en serina de los IRS&#150;1&#150;2 o "Insulin&#150;Receptor&#150;Substrates" y el segundo por inducir la transcripci&oacute;n y s&iacute;ntesis de SOCS o "Supressor&#150;Of&#150;Citokin&#150;Signaling", mol&eacute;culas que transfosforilan tambi&eacute;n en serina a los IRS&#150;1&#150;2 e inducen su prote&oacute;lisis.<sup>88&#150;91</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Este proceso patol&oacute;gico de lesi&oacute;n funcional y anat&oacute;mica en el sistema de se&ntilde;alizaci&oacute;n intracelular insul&iacute;nica en el adipocito, potencia la lip&oacute;lisis al inhibirse la promoci&oacute;n de trascripci&oacute;n y s&iacute;ntesis de fosfodiesterasa&#150;IV (enzima inhibidora de la lipasa adipocitaria) y de adiponectina.<sup>92</sup><sup>&#150;100</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Adem&aacute;s de la s&iacute;ntesis incrementada de AGL, MCP&#150;1 e IL&#150;6 por el adipocito y de TNF&#150;alfa e IL&#150;6 por el monocito y la reducci&oacute;n en la s&iacute;ntesis de adiponectina por el primero, en el estroma adiposo visceral se ha documentado un incremento en la s&iacute;ntesis de otras mol&eacute;culas como Resistina (prote&iacute;na del grupo FIZ o "Finding&#150;Inflammatory&#150;Zone), Adipsina y ASP (prote&iacute;nas activadoras de complemento), angiotensin&oacute;geno (precursor de angiotensina I&#150;II) y PAI&#150;1 o "Plasminogen&#150;Activator&#150;Inhibitor&#150;1" (inhibidor de la fibrin&oacute;lisis end&oacute;gena).<sup>101</sup></font></p>     <p align="justify"><font face="verdana" size="2"> De esta forma se establece en el tejido adiposo visceral una nociva intercomunicaci&oacute;n o "cross&#150;talk" adipocito&#150;leucocito en la cual, los AGL favorecen la s&iacute;ntesis de TNF&#150;alfa por el monocito y dicha citoquina perpet&uacute;a el ciclo induciendo al adipocito para la s&iacute;ntesis de citoquinas leuco&#150;quimiot&aacute;cticas, retroalimentando la lip&oacute;lisis, inhibiendo la s&iacute;ntesis de adiponectina y estimulando la s&iacute;ntesis de otras mol&eacute;culas con potencial proinflamatorio, vasoconstrictor y protrombog&eacute;nico.<sup>102&#150;104</sup></font></p>     <p align="justify"><font face="verdana" size="2"> El proceso fisiopatol&oacute;gico analizado con anterioridad se engloba en el concepto de tejido adiposo disfuncional, mismo que se sinergiza con el de lipotoxicidad analizado en los p&aacute;rrafos siguientes.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Adipotoxicidad <i><a href="#f4">(Fig. 4)</a></i></b></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> A niveles plasm&aacute;ticos altos, los AGL circulantes, especialmente los saturados, tienen efectos citot&oacute;xicos directos conocidos como lipotoxicidad. La lipotoxicidad provoca lesi&oacute;n anatomo&#150;funcional, tanto en las c&eacute;lulas del eje metab&oacute;lico (adipocito&#150;hepatocito&#150;miocito esquel&eacute;tico), como en otras estirpes celulares (leucocitos, c&eacute;lulas endoteliales y c&eacute;lulas beta). Su efecto sinergiza a los ya referidos para las citoquinas como el TNF&#150;alfa, la IL&#150;6 y favorece la activaci&oacute;n de la NADPH&#150;oxidasa leucocitaria y la producci&oacute;n de RLO2 (radicales libres de 02).</font></p>     <p align="justify"><font face="verdana" size="2"> Los AGL producidos en exceso en el estroma visceral, alcanzan la circulaci&oacute;n sist&eacute;mica v&iacute;a la circulaci&oacute;n portal&#150;hep&aacute;tica. A nivel perif&eacute;rico, los AGL provocan un estado de Rl caracterizado por<sup>105</sup><sup>&#150;109</sup> <i><a href="#f5">(Fig. 5)</a>:</i></font></p>     <p align="center"><font face="verdana" size="2"><a name="f5"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f5.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> 1.&nbsp; Inhibici&oacute;n de los efectos metab&oacute;licos de la insulina. Desinhibici&oacute;n de la lip&oacute;lisis, desinhibici&oacute;n de la gluconeog&eacute;nesis e inhibici&oacute;n de la betaoxidaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"> 2.&nbsp; Activaci&oacute;n de monocitos circulantes. Producci&oacute;n y efecto sist&eacute;mico de TNF&#150;alfa, otras leucocitoquinas y RL02.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> 3.&nbsp; Afecci&oacute;n de la funci&oacute;n endotelial insulino&#150;dependiente.</font></p>     <p align="justify"><font face="verdana" size="2"> 4.&nbsp; Apoptosis de la c&eacute;lula beta pancre&aacute;tica.</font></p>     <p align="justify"><font face="verdana" size="2"> As&iacute;, la disfunci&oacute;n del tejido adiposo y la lipotoxicidad son los dos mecanismos que explican el estado proinflamatorio y de Rl que torna patog&eacute;nica a la obesidad visceral y ocasiona el da&ntilde;o anatomo&#150;funcional sobre las c&eacute;lulas beta pancre&aacute;tica y endotelial, sustratos del riesgo incrementado para DM2 y ECVA.</font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a16f6.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> El umbral para el da&ntilde;o &#150;predeterminado gen&eacute;ticamente&#150; de los receptores de insulina y/o sus sistemas de se&ntilde;alizaci&oacute;n intracelular, especialmente de los IRS&#150;1&#150;2 y las PKB, Akt&#150;1 y Akt&#150;2, es quiz&aacute; la variable que explique porqu&eacute;, a niveles similares de obesidad, diferentes poblaciones e individuos, tienen umbrales diferentes para el desarrollo de Rl y de sus subrogados.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Rl, disfunci&oacute;n endotelial y aterotrombosis</b></font></p>     <p align="justify"><font face="verdana" size="2"> El efecto de la Rl en la funci&oacute;n endotelial es el nexo que explica la asociaci&oacute;n entre obesidad visceral (SM) y ECVA aun en fases prediab&eacute;ticas. Las c&eacute;lulas endoteliales (CE) tienen normalmente receptores de insulina que activan al sistema de se&ntilde;alizaci&oacute;n intracelular referido previamente (IRS&#150;l&#150;2&#150;PIK3&#150;Akt&#150;l&#150;2). La Akt&#150;2 es la kinasa encargada de fosforilar a la eNOS "endothelial&#150;Nitric&#150;Oxide&#150;Syntase" e inducir la producci&oacute;n de ON, as&iacute; mismo es probable que induzca la activaci&oacute;n de la prote&iacute;na reguladora de genes KLF&#150;2 o "Kruppel&#150;Like&#150;Factor&#150;2", promotora de la transcripci&oacute;n y s&iacute;ntesis de eNOS y trombomodulina.<sup>110&#150;112</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La Akt&#150;2 tambi&eacute;n contrarresta el efecto activador de la kinasa Rac&#150;1 sobre la NADPH&#150;oxidasa endotelial inducida por los AGL y el TNF&#150;alfa y generadora de RLO2. Los RLO2 son 2os mensajeros para la desrepresi&oacute;n de la prote&iacute;na reguladora de genes NFkB. El NFkB es la principal prote&iacute;na reguladora de genes proinflamatorios en la CE y promueve la transcripci&oacute;n y s&iacute;ntesis de m&aacute;s de 150 genes, entre ellos los de Endotelina&#150;1 (E&#150;l), ICAM o "Inter&#150;Cellular&#150;Adhesion&#150;Molecule", VCAM o "Vasculo&#150;Cellular&#150;Adhesion&#150;Molecule", selectinas E, P y L, PAI&#150;1 y EDGF o "Endothelial&#150;Derivated&#150;Growth&#150;Factor", etc. El NFkB a su vez reprime la promoci&oacute;n del gen de la eNOS, entre otros, como el de la osteocalcina y las "Bone&#150;Morphogenetic&#150;Proteins" o BMP.<sup>113,114</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> As&iacute;, la insulina normalmente induce en la CE la expresi&oacute;n de su fenotipo fisiol&oacute;gico determinado principalmente por el ON y caracterizado por vasodilataci&oacute;n autorregulada, antiadhesi&oacute;n de leucocitos y plaquetas circulantes e inhibici&oacute;n de la migraci&oacute;n, hiperplasia y transformaci&oacute;n de c&eacute;lulas musculares lisas (CML) de la capa media arterial <i><a href="#f5">(Fig. 5)</a>.</i></font></p>     <p align="justify"><font face="verdana" size="2"> El innato estado de Rl en ciertas poblaciones e individuos, el cual por ser sist&eacute;mico involucra tambi&eacute;n a las CE, es sinergizado por la acci&oacute;n sobre los IRS&#150;1&#150;2 de los AGL, las citoquinas como el TNF&#150;alfa y los RLO2 y ocasiona un estado de disfunci&oacute;n endotelial, en el cual el fenotipo fisiol&oacute;gico de las CE se transforma en un fenotipo caracterizado por vasodilataci&oacute;n inapropiada, adhesi&oacute;n leucocitaria y plaquetaria con un estado fibrinol&iacute;tico disminuido y migraci&oacute;n, hiperplasia y transformaci&oacute;n de las CML de la capa media arterial.</font></p>     <p align="justify"><font face="verdana" size="2"> Dicho estado de disfunci&oacute;n de las CE no es una elucubraci&oacute;n te&oacute;rica, se ha documentado fehacientemente en el ser humano <i>in vivo </i>tanto en la circulaci&oacute;n arterial perif&eacute;rica como en la coronaria. En individuos con SM, RI y ausencia de enfermedad aterosclerosa cl&iacute;nica, incluso excluida por angiotomograf&iacute;a coronaria multicorte, se ha demostrado que existe disfunci&oacute;n endotelial traducida por una disminuci&oacute;n de la vasodilataci&oacute;n reactiva en la arteria humeral o ca&iacute;da del flujo mioc&aacute;rdico medido tanto por ecocardiograf&iacute;a perfusoria, como por tomograf&iacute;a de emisi&oacute;n de positrones mioc&aacute;rdica, despu&eacute;s de un reto con una dieta alta en carbohidratos simples y grasa o por la estimulaci&oacute;n con fr&iacute;o.<sup>115&#150;119</sup></font></p>     <p align="justify"><font face="verdana" size="2"> As&iacute; mismo se ha demostrado en la poblaci&oacute;n referida, una relaci&oacute;n inversamente proporcional entre la ca&iacute;da del flujo braquial y el incremento de PCR, IL&#150;6 y nitrotirosina (marcador de estr&eacute;s oxidativo), ello despu&eacute;s de la ingesta de una dieta de alta densidad energ&eacute;tica. Estas alteraciones en la funci&oacute;n endotelial y sus subrogados inflamatorios se corrigen en grado variable y significativo con la modificaci&oacute;n del tipo de dieta y/o con el empleo profil&aacute;ctico de inhibidores del receptor AT&#150;1 y/o estatinas, siendo sin&eacute;rgico el efecto ben&eacute;fico de ambos f&aacute;rmacos.<sup>116</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Este fen&oacute;meno de disfunci&oacute;n endotelial e inflamaci&oacute;n postprandial en individuos con SM, explica el mecanismo que hasta ahora s&oacute;lo implicaba a la hiperglucemia postprandial como un factor de riesgo aterotromb&oacute;tico, incluso m&aacute;s significativo que la hiperglucemia de ayuno.</font></p>     <p align="justify"><font face="verdana" size="2"> Si aceptamos que la disfunci&oacute;n endotelial diagnosticada en el territorio perif&eacute;rico o en el coronario, es un poderoso predictor de eventos cardiovasculares mayores con incremento del riesgo que oscila entre 2.5 y 5,<sup>118</sup> es l&oacute;gico postular que la RI causa incremento de la EC VA a trav&eacute;s de la disfunci&oacute;n endotelial y que &eacute;sta se disparar&aacute; con la presencia del resto de los factores de da&ntilde;o endotelial asociados a la RI, es decir, la hiperglucemia de ayuno y/o postprandial, la hipoalfalipoproteinemia con hipertrigliceridemia y la hipertensi&oacute;n arterial. Lo anterior independientemente del da&ntilde;o endotelial provocado por el incremento en la concentraci&oacute;n plasm&aacute;tica de colesterol&#150;LDL.</font></p>     <p align="justify"><font face="verdana" size="2"> Para que suceda lo anterior no es necesario que se manifieste con DM2 el estado de insuficiencia pancre&aacute;tica beta. El da&ntilde;o funcional y anat&oacute;mico del endotelio, incluyendo a sus c&eacute;lulas progenitoras, como se ha explicado, inicia precozmente y tiene las caracter&iacute;sticas necesarias para propiciar el desarrollo de aterotrombosis. Entendiendo a la aterotrombosis no &uacute;nicamente como una respuesta endotelial al da&ntilde;o arterial, sino tambi&eacute;n como una respuesta inapropiada del tejido endotelial progenitor al da&ntilde;o vascular.<sup>120</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Es por todo lo anterior que el concepto SM contin&uacute;a evolucionando y creando gran expectativa en cl&iacute;nicos y b&aacute;sicos e involucrado a los cardi&oacute;logos, hasta ahora s&oacute;lo espectadores finales de las cat&aacute;strofes de este proceso fisio&#150;anatomo&#150;patol&oacute;gico.<sup>121,122</sup></font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Conclusiones</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> En este an&aacute;lisis sobre la fisiopatolog&iacute;a de la RI y su nexo con la EC VA y la DM2 se han destacado los siguientes conceptos de importancia cl&iacute;nica.</font></p>     <p align="justify"><font face="verdana" size="2"> 1. La ingesta de una dieta con alta densidad energ&eacute;tica, alto contenido de grasa saturada, alto &iacute;ndice&#150;carga gluc&eacute;mica, alta en fructuosa y baja en fibra y en calcio, en conjunto con el sedentarismo, son la principal causa de obesidad central. Lo anterior no s&oacute;lo por un incremento del aporte de glucosa y grasa y una reducci&oacute;n en el gasto energ&eacute;tico, sino tambi&eacute;n por francos trastornos en las asas de regulaci&oacute;n aferente, intrahipotal&aacute;mica&#150;l&iacute;mbica y eferente que modulan el equilibrio apetito&#150;saciedad, con incremento del primero y reducci&oacute;n de la segunda.</font></p>     <p align="justify"><font face="verdana" size="2"> 2. La situaci&oacute;n previa ocasiona un cambio en el fenotipo del adipocito, especialmente el visceral. El adipocito hipertr&oacute;fico e hiperpl&aacute;sico (adipocito obeso) incrementa su tasa de lip&oacute;lisis y con ello la liberaci&oacute;n de AGL. Los AGL son ligandos de los receptores TLR de los leucocitos normalmente localizados en el estroma adiposo visceral. El leucocito estimulado por los AGL produce TNF&#150;alfa, esta citoquina activa a su vez a los receptores TNF&#150;1&#150;2 del adipocito obeso, el cual produce MCP&#150;1 con atracci&oacute;n de m&aacute;s leucocitos, incremento de su tasa de lip&oacute;lisis y reducci&oacute;n de su producci&oacute;n de adiponectina.</font></p>     <p align="justify"><font face="verdana" size="2"> 3. Este fen&oacute;meno de intercomunicaci&oacute;n proinflamatoria, adipocito&#150;leucocito en un inicio s&oacute;lo es paracrino, se potencia con la producci&oacute;n de otras mol&eacute;culas como resistina, adipsina, ASP, angiotensin&oacute;geno y PAI&#150;1 y v&iacute;a portal, invade la circulaci&oacute;n sist&eacute;mica con da&ntilde;o funcional y anat&oacute;mico a las c&eacute;lulas del eje metab&oacute;lico, las c&eacute;lulas endoteliales y la c&eacute;lula beta. As&iacute; la disfunci&oacute;n del tejido adiposo y la adipotoxicidad son los dos mecanismos etiopatog&eacute;nicos para la ECVA y la DM2 iniciada por la obesidad visceral.</font></p>     <p align="justify"><font face="verdana" size="2"> 4. La disfunci&oacute;n endotelial y un estado proinflamatorio y oxidativo subcl&iacute;nicos, han sido demostrados fehacientemente en los individuos con un fenotipo metab&oacute;lico sugestivo de RI. Dicha alteraci&oacute;n inicialmente funcional es el sustrato para que a la postre con la coexistencia de disglucemia, dislipidemia e hipertensi&oacute;n arterial, se evolucione hacia un proceso aterotromb&oacute;tico.</font></p>     <p align="justify"><font face="verdana" size="2"> 5. Finalmente, la forma en que se establezca el diagn&oacute;stico de SM ser&aacute; irrelevante as&iacute; como innecesaria su confrontaci&oacute;n con el concepto de s&iacute;ndrome X y mucho menos con las escalas establecidas para el c&aacute;lculo del riesgo de eventos cardiovasculares como la de Framingham.</font></p>     <p align="justify"><font face="verdana" size="2"> Lo anterior siempre y cuando razonemos:</font></p>     <p align="justify"><font face="verdana" size="2"> a) Que es innegable que nuestro medio ambiente obesog&eacute;nico no es sano.</font></p>     <p align="justify"><font face="verdana" size="2"> b) Que si bien la obesidad visceral es la causa m&aacute;s frecuente de RI en nuestro mundo occidental, no todo obeso, pero s&iacute; la mayor&iacute;a tiene RI y viceversa, que no es condici&oacute;n "sine qua non" ser obeso para tener RI.</font></p>     <p align="justify"><font face="verdana" size="2"> c) Que la adipotoxicidad y la disfunci&oacute;n adipocitaria proinflamatorias son procesos patol&oacute;gicos bien demostrados que retroalimentan a la RI y ocasionan disfunci&oacute;n endotelial y fallo celular beta y con ello un riesgo facilitado para el desarrollo de aterotrombosis, ECVA y DM2.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> d) Que la aplicaci&oacute;n de estos conceptos es especialmente &uacute;til en los individuos con un "tradicional" riesgo Framingham bajo e incluso mediano, en los cuales el calificativo bajo o mediano &#150;a&uacute;n con colesterol&#150;LDL "en meta"&#150;, en presencia de alg&uacute;n marcador de SM debe ponderarse con m&aacute;s acuciosidad, ya que la sola presencia de un solo criterio diagn&oacute;stico de SM, determina un incremento progresivo en el riesgo, el cual si bien puede tener una polaridad hacia la DM2 o hacia la ECVA, dicha polaridad finalmente ser&aacute; irrelevante si aceptamos:</font></p>     <p align="justify"><font face="verdana" size="2"> e) Que, ambas enfermedades, la DM2 y la ECVA, imponen un pron&oacute;stico vital igualmente reducido.</font></p>     <p align="justify"><font face="verdana" size="2"> As&iacute;, esta revisi&oacute;n demuestra que nuestra tendencia de buscar soluciones simples a problemas complejos no siempre es posible e incluso, puede llegar a confundirnos. Eso ha sucedido con el SM. 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