<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422013000600003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores vasculares implicados en la preeclampsia]]></article-title>
<article-title xml:lang="en"><![CDATA[Vascular factors involved in pre-eclampsia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Itami-Sordo]]></surname>
<given-names><![CDATA[Ma. Eréndira]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Nieto]]></surname>
<given-names><![CDATA[René]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Haro]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto de Salud del Estado de México Hospital General de Zona José Vicente Villada Servicio de Ginecoobstetricia]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>18</fpage>
<lpage>24</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422013000600003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422013000600003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422013000600003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La preeclampsia es una enfermedad que únicamente se presenta en la mujer embarazada y que se caracteriza por hipertensión y proteinuria con o sin edema después de la semana 20 de embarazo. Aunque se han propuesto múltiples teorías para explicar su patogenia, recientemente éstas han confluido en una circulación placentaria deficiente que ocasiona hipoxia en el producto y disfunción endotelial sistémica en la madre al reducir los factores que promueven un adecuado funcionamiento endotelial. El receptor semejante a FMS 1 (sFlt-1) y la endoglina (sEng) solubles se han asociado a la disminución del factor de crecimiento vascular endotelial (VEGF) y el factor de crecimiento transformante (TGF) en el plasma materno, respectivamente; lo que contribuye a una irrigación deficiente del producto y a alteraciones maternas que conducen a hipertensión y proteinuria. Algunas sustancias como los anticuerpos contra angiotensina II pueden provocar la liberación de tales factores antiangiogénicos. La determinación del sFlt-1 y sEng en el plasma de mujeres embarazadas podrían llegar a utilizarse para predecir qué mujeres padecerán preeclampsia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Preeclampsia is a disease that only affects pregnant women and is characterized by hypertension and proteinuria with or without edema after 20 weeks' gestation. Although many hypotheses have been postulated to explain its pathogenicity, some of them have recently concurred that the cause may be an altered placental circulation which causes hypoxia to the fetus and systemic endothelium dysfunction to the mother by reducing the factors promoting adequate endothelial functioning. Soluble FMS-like receptor 1 (sFlt-1) and en-doglin (sEng) have been associated to a decrease of Vascular endothelial growth factor (VEGF) and Transforming growth factor (TGF) in mother's plasma, respectively; thus contributing to a deficient persufion of the fetus and to maternal disturbances, leading to hypertension and proteinuria. Some substances like antibodies against angiotensin II may trigger the release of such angiogenic factors. The assessment of sFlt-1 and sEng in pregnant women plasma might be used to to detect those women who will develop preeclampsia.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Preclampsia]]></kwd>
<kwd lng="es"><![CDATA[mujer]]></kwd>
<kwd lng="es"><![CDATA[embarazo]]></kwd>
<kwd lng="en"><![CDATA[Preeclampsia]]></kwd>
<kwd lng="en"><![CDATA[woman]]></kwd>
<kwd lng="en"><![CDATA[pregnant]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Factores vasculares implicados en la preeclampsia</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Vascular factors involved in pre&#45;eclampsia</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Ma. Er&eacute;ndira Itami&#45;Sordo<sup>a,b</sup>, Ren&eacute; Jim&eacute;nez&#45;Nieto<sup>b</sup>, Roberto de Haro<sup>a</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup> <i>FES Iztacala. Universidad Nacional Aut&oacute;noma de M&eacute;xico. Tlalnepantla. Estado de M&eacute;xico.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Servicio de Ginecoobstetricia. Hospital General de Zona "Jos&eacute; Vicente Villada". Instituto de Salud del Estado de M&eacute;xico (ISEM). Cuautitl&aacute;n de Romero Rubio. Estado de M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2">Correo electr&oacute;nico: <a href="mailto:rodeharo@campus.iztacala.unam.mx">rodeharo@campus.iztacala.unam.mx</a></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: 23&#45;marzo&#45;2012.    <br> 	Aceptado: 23&#45;mayo&#45;2012.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La preeclampsia es una enfermedad que &uacute;nicamente se presenta en la mujer embarazada y que se caracteriza por hipertensi&oacute;n y proteinuria con o sin edema despu&eacute;s de la semana 20 de embarazo. Aunque se han propuesto m&uacute;ltiples teor&iacute;as para explicar su patogenia, recientemente &eacute;stas han confluido en una circulaci&oacute;n placentaria deficiente que ocasiona hipoxia en el producto y disfunci&oacute;n endotelial sist&eacute;mica en la madre al reducir los factores que promueven un adecuado funcionamiento endotelial. El receptor semejante a FMS 1 (sFlt&#45;1) y la endoglina (sEng) solubles se han asociado a la disminuci&oacute;n del factor de crecimiento vascular endotelial (VEGF) y el factor de crecimiento transformante (TGF) en el plasma materno, respectivamente; lo que contribuye a una irrigaci&oacute;n deficiente del producto y a alteraciones maternas que conducen a hipertensi&oacute;n y proteinuria. Algunas sustancias como los anticuerpos contra angiotensina II pueden provocar la liberaci&oacute;n de tales factores antiangiog&eacute;nicos. La determinaci&oacute;n del sFlt&#45;1 y sEng en el plasma de mujeres embarazadas podr&iacute;an llegar a utilizarse para predecir qu&eacute; mujeres padecer&aacute;n preeclampsia.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Preclampsia, mujer, embarazo.</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>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Preeclampsia is a disease that only affects pregnant women and is characterized by hypertension and proteinuria with or without edema after 20 weeks' gestation. Although many hypotheses have been postulated to explain its pathogenicity, some of them have recently concurred that the cause may be an altered placental circulation which causes hypoxia to the fetus and systemic endothelium dysfunction to the mother by reducing the factors promoting adequate endothelial functioning. Soluble FMS&#45;like receptor 1 (sFlt&#45;1) and en&#45;doglin (sEng) have been associated to a decrease of Vascular endothelial growth factor (VEGF) and Transforming growth factor (TGF) in mother's plasma, respectively; thus contributing to a deficient persufion of the fetus and to maternal disturbances, leading to hypertension and proteinuria. Some substances like antibodies against angiotensin II may trigger the release of such angiogenic factors. The assessment of sFlt&#45;1 and sEng in pregnant women plasma might be used to to detect those women who will develop preeclampsia.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Preeclampsia, woman, pregnant.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/facmed/v56n2/a3i1.jpg"></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">La preeclampsia es una enfermedad que puede afectar a mujeres despu&eacute;s de la semana 20 de embarazo, que se caracteriza por presi&oacute;n arterial sist&oacute;lica igual o superior a 140 o diast&oacute;lica igual o mayor de 90 mmHg y por proteinuria (presencia de prote&iacute;nas en orina superior a 300 mg/24 horas o 30mg/dl en cualquier muestra), con o sin edema. La preeclampsia con &eacute;stas caracter&iacute;sticas se conoce como leve y puede avanzar a grave, y se distingue de la anterior por una presi&oacute;n arterial mayor o igual a 160 o diast&oacute;lica igual o mayor a 110 mmHg<sup>1&#45;3</sup>. Con una incidencia que var&iacute;a entre 3 y 10%, dependiendo de la raza y condici&oacute;n socioecon&oacute;mica, entre otros factores, la preeclampsia es una de las principales causas de morbimortalidad materna y fetal en el mundo<sup>3,4</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Conocida desde hace d&eacute;cadas como la enfermedad de las teor&iacute;as, actualmente se reconoce que la preeclampsia es un trastorno multifactorial que provoca disfunci&oacute;n endotelial, lo que conduce a alteraciones vasculares sist&eacute;micas en la madre, que se manifiestan con hipertensi&oacute;n y proteinuria<sup>2,5,6</sup>. La preeclampsia grave com&uacute;nmente se acompa&ntilde;a de otros s&iacute;ntomas y puede progresar a eclampsia, que se caracteriza por convulsiones y alteraciones m&aacute;s avanzadas en otros &oacute;rganos como el cerebro, h&iacute;gado y ri&ntilde;ones<sup>2,6</sup>. Las pacientes con preeclampsia grave o con eclampsia pueden desarrollar el s&iacute;ndrome con hem&oacute;lisis, elevaci&oacute;n de enzimas hep&aacute;ticas y descenso de las plaquetas (HELLP, por sus siglas en ingl&eacute;s), que suele complicar la ya delicada condici&oacute;n de salud de las pacientes ecl&aacute;mpticas<sup>7,8</sup>. En el s&iacute;ndrome HELLP la elevaci&oacute;n en la enzima lactato deshidrogenasa (LDH) indica hem&oacute;lisis, mientras que el aumento en las enzimas alanina transaminasa (ALT) y aspartato transaminasa (AST) reflejan el da&ntilde;o que experimentan los hepatocitos, a su vez que la disminuci&oacute;n de plaquetas por debajo de 100,000/ mm<sup>3</sup> indica su destrucci&oacute;n<sup>7,8</sup>. Este s&iacute;ndrome, reconocido como un trastorno multisist&eacute;mico, se caracteriza por alta mortalidad materna y perinatal, y requiere de la intervenci&oacute;n del servicio de cuidados intensivos, por lo que su diagn&oacute;stico y tratamiento oportunos est&aacute;n relacionados con un mejor pron&oacute;stico. Recientemente se han realizado importantes descubrimientos en los factores vasculares implicados en la preeclampsia y trastornos derivados, por lo que en el presente art&iacute;culo se analizan algunos factores vasculares que participan en la fisiopatolog&iacute;a de dicha enfermedad.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>VASCULARIZACI&Oacute;N EN LA PLACENTACI&Oacute;N NORMAL</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Durante el embarazo normal, posterior a la implantaci&oacute;n del embri&oacute;n en el fondo uterino, ocurre una serie de eventos en el endometrio decidualizado que llevan al remodelamiento de la circulaci&oacute;n materna y a la formaci&oacute;n de nuevos vasos sangu&iacute;neos a partir de vasos preexistentes, proceso conocido como angiog&eacute;nesis, a fin de proveer al producto de un suministro adecuado de nutrientes y otras sustancias fundamentales. Durante la placentaci&oacute;n normal tambi&eacute;n ocurre la vasculog&eacute;nesis o formaci&oacute;n de vasos sangu&iacute;neos a partir de islotes sangu&iacute;neos y la pseudovasculog&eacute;nesis, que es la transformaci&oacute;n de c&eacute;lulas del trofoblasto en c&eacute;lulas endoteliales a nivel placentario, proceso que contribuye grandemente al remodelamiento de la circulaci&oacute;n materna<sup>9,10</sup>. Estos procesos est&aacute;n altamente regulados por una serie de factores de crecimiento, entre los que se encuentran el factor de crecimiento vascular endotelial (VEGF) y el factor de crecimiento plaquetario (PlGF), as&iacute; como tambi&eacute;n por citocinas que provienen de c&eacute;lulas del trofoblasto, c&eacute;lulas asesinas naturales y c&eacute;lulas dendr&iacute;ticas, entre otras<sup>11,12</sup>. De entre &eacute;stas c&eacute;lulas, destaca la participaci&oacute;n de c&eacute;lulas del trofoblasto, que participan activamente en el establecimiento de la circulaci&oacute;n placentaria a fin de garantizar una buena perfusi&oacute;n sangu&iacute;nea al producto<sup>13</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">De hecho, recientemente se demostr&oacute; que la disminuci&oacute;n del remodelamiento vascular inducido por el trofoblasto mediante la inhibici&oacute;n de la metaloproteinasa de matriz en ratas condujo a una menor perfusi&oacute;n vascular de la placenta<sup>14</sup>. Actualmente se cree que la isquemia de las arterias espirales del endometrio y la alteraci&oacute;n de la angiog&eacute;nesis durante el segundo trimestre del embarazo conducen a un remodelamiento deficiente de la circulaci&oacute;n uterina materna, lo que conduce al desarrollo de la preeclampsia en la mujer<sup>15&#45;17</sup>. Los factores de crecimiento y dem&aacute;s sustancias se analizan a continuaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/facmed/v56n2/a3i2.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>PROSTACICLINA Y TROMBOXANO A2</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La prostaciclina, tambi&eacute;n llamada prostaglandina I<sub>2</sub>, y el tromboxano A<sub>2</sub> son sustancias vasoactivas conocidas como eicosanoides o prostanoides, que se sintetizan a partir del &aacute;cido araquid&oacute;nico y otros &aacute;cidos grasos poliinsaturados<sup>18</sup>. Con una actividad vasorelajadora y de antiagregante plaquetario, el aumento en prostaciclina durante el embarazo se relaciona con el aumento en el flujo sangu&iacute;neo al &uacute;tero. Por otra parte, el tromboxano A<sub>2</sub> presenta una actividad contraria a la de la prostaciclina, es decir, es vasoconstrictora y agregante plaquetario, por lo que aumenta la actividad uterina y disminuye el flujo sangu&iacute;neo al &uacute;tero<sup>19</sup>. Es importante considerar que el &uacute;tero de mujeres adultas no embarazadas recibe aproximadamente el 5% del gasto cardiaco, mientras que en la mujer embarazada &eacute;ste aumenta progresivamente hasta ser alrededor del 20% al t&eacute;rmino del embarazo. Desde hace varias d&eacute;cadas se ha reconocido que en las mujeres preecl&aacute;mpticas hay un desbalance entre las concentraciones plasm&aacute;ticas de prostaciclina y tromboxano A<sub>2</sub>, inclinado al aumento de tromboxano, lo que propicia estenosis vascular en la placenta, condici&oacute;n no deseable en el segundo y tercer trimestres del embarazo para el desarrollo adecuado del feto, que puede conducir a problemas de hipertensi&oacute;n en la madre e incluso a preeclampsia, adem&aacute;s de aumento en la formaci&oacute;n de trombos, que puede llevar a problemas de circulaci&oacute;n e incluso embolismo pulmonar<sup>19,20</sup>. El desbalance a favor del tromboxano A2 sobre la prostaciclina no es exclusiva de la preeclampsia, sino que se presenta tambi&eacute;n en otras enfermedades como vasoespasmo cerebral e infarto al miocardio, entre otras<sup>21</sup>. Por su capacidad para inhibir la s&iacute;ntesis de eicosanoides, se ha estudiado la posibilidad de que el &aacute;cido acetilsalic&iacute;lico pueda utilizarse para prevenir la preeclampsia, y se ha encontrado que s&iacute; tiene efecto en prevenirla<sup>22</sup>, sobre todo en casos de preeclampsia grave<sup>23</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>OXIDO N&Iacute;TRICO</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El &oacute;xido n&iacute;trico (NO) es una sustancia que se produce en m&uacute;ltiples c&eacute;lulas. Se reconocen 3 enzimas, llamadas &oacute;xido n&iacute;trico sintasas, que lo sintetizan a partir del amino&aacute;cido L&#45;arginina. El NO cumple funciones de neurotransmisor, de sustancia t&oacute;xica en los macr&oacute;fagos utilizada para destruir microbios y como relajante del m&uacute;sculo liso<sup>24</sup>. El NO se produce en el endotelio a fin de relajar el m&uacute;sculo vascular subyacente y con ello contribuir a la relajaci&oacute;n de los vasos sangu&iacute;neos<sup>25</sup>. Esta es la sustancia que previamente se le llam&oacute; factor relajante derivada del endotelio<sup>24,25</sup>. En 1994 Seligman et al. demostraron que las mujeres preecl&aacute;mticas presentan menor concentraci&oacute;n de nitritos y nitratos en el suero sangu&iacute;neo; puesto que los nitritos y nitratos son productos de degradaci&oacute;n del NO, los autores concluyeron que las mujeres preecl&aacute;mpticas producen menos NO que las que cursan con embarazo normal<sup>26</sup>. Debido a que el NO es tambi&eacute;n un antiagregante plaquetario e impide la adhesi&oacute;n de las plaquetas al endotelio vascular, la menor producci&oacute;n de NO en las mujeres preecl&aacute;mpticas explicar&iacute;a porque estas pacientes tienden m&aacute;s hacia la hipercoagulaci&oacute;n que aqu&eacute;llas que no cursan con preeclampsia. La menor disponibilidad de NO en mujeres preecl&aacute;mpticas puede deberse no solamente a una menor producci&oacute;n, sino a su neutralizaci&oacute;n por las especies de ox&iacute;geno reactivas producidas por el endotelio disfuncional, como el ani&oacute;n radical super&oacute;xido (O<sub>2</sub>&#8226;<sup>&#45;</sup>), con el que reacciona para formar peroxinitrito, una sustancia que no presenta efecto similar al del NO, sino que, por el contrario, promueve el da&ntilde;o peroxidativo de las c&eacute;lulas endoteliales, da&ntilde;o que puede determinarse indirectamente por la concentraci&oacute;n aumentada de lipoper&oacute;xidos en la sangre materna<sup>27</sup>. Se sabe que la hipoxia placentaria induce la generaci&oacute;n de mayor concentraci&oacute;n de especies de ox&iacute;geno reactivas, lo que conduce a una disminuci&oacute;n en la disponibilidad de NO que agrava la situaci&oacute;n de hipoxia fetal y dificulta la relajaci&oacute;n del endotelio de la madre a nivel sist&eacute;mico<sup>27,28</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s, se sabe que, entre otros factores, la dimetilarginina asim&eacute;trica, un inhibidor natural de la &oacute;xido n&iacute;trico sintasa<sup>29</sup>, se presenta en mayor concentraci&oacute;n plasm&aacute;tica en mujeres embarazadas que cursan con preeclampsia<sup>30</sup>, lo que se relaciona con una menor producci&oacute;n de NO<sup>31</sup>. Por otra parte, el NO es capaz de regular la s&iacute;ntesis de eicosanoides, aumentar la s&iacute;ntesis del tromboxano A2<sup>32</sup> y disminuir la s&iacute;ntesis de prostaglandinas<sup>33</sup>, lo que podr&iacute;a explicar por qu&eacute; en pacientes preecl&aacute;mpticas la relaci&oacute;n tromboxano prostaglandinas est&aacute; alterada a favor del tromboxano A<sub>2</sub>.</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>ENDOTELINA</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Conocida por su alto efecto vasoconstrictor, la endotelina, un p&eacute;ptido producido por las c&eacute;lulas endoteliales<sup>34</sup>, aumenta en la mujer preecl&aacute;mptica en comparaci&oacute;n con mujeres con embarazo normal<sup>35</sup>, por lo que se puede afirmar que en la mujer preecl&aacute;mptica hay un aumento en la liberaci&oacute;n de sustancias vasoconstrictoras como endotelina y tromboxano A<sub>2</sub>, as&iacute; como una disminuci&oacute;n en la producci&oacute;n de sustancias vasorelajadoras como el NO, prostaciclina y el factor hiperpolarizante derivado del endotelio (EDHF)<sup>36</sup>, una sustancia de la que a&uacute;n no se conoce bien su naturaleza qu&iacute;mica<sup>37</sup>, aunque sus efectos est&aacute;n bien caracterizados. Este desbalance conduce a un aumento en la tensi&oacute;n arterial materna, contribuyendo a la sintomatolog&iacute;a de la preeclampsia<sup>36</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ANGIOTENSINA II</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El sistema renina angiotensina aldosterona participa en la regulaci&oacute;n de la presi&oacute;n sangu&iacute;nea al promover la vasoconstricci&oacute;n por la angiotensina II, y la reabsorci&oacute;n de sodio a nivel de los t&uacute;bulos contorneados distales de los ri&ntilde;ones por la aldosterona<sup>38</sup>. En mujeres preecl&aacute;mpticas se ha encontrado una mayor sensibilidad a angiotensina II en los vasos sangu&iacute;neos e incluso la presencia de autoanticuerpos contra el receptor de angiotensina II que estimulan la secreci&oacute;n de aldosterona<sup>39</sup>. La producci&oacute;n de anticuerpos antiangiotensina II indican la participaci&oacute;n de factores inmunol&oacute;gicos intr&iacute;nsecos que pueden terminar en preeclampsia, con el subsecuente da&ntilde;o materno y fetal. Los mecanismos que alteran la tolerancia inmunol&oacute;gica hacia los receptores de angiotensina II parecen ser diferentes de las condiciones inmunol&oacute;gicas por las que el organismo femenino genera anticuerpos hacia los espermatozoides de su pareja, lo que seguramente promover&aacute; una mayor investigaci&oacute;n de los mecanismos inmunol&oacute;gicos implicados en la preeclampsia.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/facmed/v56n2/a3i3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ENDOTELIOSIS GLOMERULAR</b></font></p>  	    <p align="justify"><font face="verdana" size="2">A nivel renal el da&ntilde;o caracter&iacute;stico de la preeclampsia es la endoteliosis glomerular, que es una variante espec&iacute;fica de microangiopat&iacute;a tromb&oacute;tica que se caracteriza por inflamaci&oacute;n endotelial, reducci&oacute;n de fenestraciones y obstrucci&oacute;n del lumen capilar de los glom&eacute;rulos<sup>40</sup>. Este da&ntilde;o es reversible al ser expulsada la placenta, aunque en ocasiones puede haber secuelas despu&eacute;s de experimentar preeclampsia, que pude manifestarse como proteinuria y que en ocasiones evoluciona a insuficiencia renal terminal<sup>41</sup>. A este respecto, cabe mencionar que las pacientes preecl&aacute;mpticas tambi&eacute;n tienen una mayor probabilidad de desarrollar enfermedades cardiovasculares posteriores a la enfermedad que las no preecl&aacute;mpticas<sup>42</sup>, e incluso presentan una mayor incidencia de hipotiroidismo<sup>43</sup>.</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>FACTORES DE CRECIMIENTO Y SUS RECEPTORES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El factor de crecimiento vascular endotelial (VEGF), el factor de crecimiento plaquetario (PlGF) y el factor de crecimiento transformante (TGF) est&aacute;n entre las sustancias que act&uacute;an sobre las c&eacute;lulas endoteliales mediante receptores de membrana espec&iacute;ficos a fin de funcionar eficientemente y regular la fisiolog&iacute;a vascular<sup>44&#45;46</sup>. Los receptores del VEGF son el receptor tirosina cinasa semejante a FMS&#45;1 (Flt&#45;1) y el KDR/Flk&#45;1 que tambi&eacute;n fijan al PlGF, de hecho, el PlGF se reconoce como una de las cinco variedades del VEGF (VEGF&#45;1, VEGF&#45;2, VEGF&#45;3, VEGF&#45;4 y PlGF),<sup>44</sup> mientras que el receptor para el TGF es la endoglina (Eng)<sup>47</sup>. Muchos estudios han demostrado la importancia de estos factores de crecimiento en la vasculog&eacute;nesis y angiog&eacute;nesis, y han encontrado que cuando apagan los genes para sus receptores en roedores, los embriones mueren a media gestaci&oacute;n por los problemas que surgen en la formaci&oacute;n de nuevos vasos sangu&iacute;neos<sup>48,49</sup>. A nivel placentario varias c&eacute;lulas participan en la secreci&oacute;n de &eacute;stos factores de crecimiento, esenciales en el proceso de placentaci&oacute;n<sup>12</sup>.</font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/facmed/v56n2/a3i4.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Durante la primera d&eacute;cada de &eacute;ste siglo se demostr&oacute; que en mujeres preecl&aacute;mpticas, la isquemia a nivel placentario ocasiona el desprendimiento tanto del Flt&#45;1 como de la endoglina (Eng) de las membranas endoteliales, llam&aacute;ndolos entonces sFlt&#45;1 y sEng, respectivamente. El sFlt&#45;1 y la sEng fijan los factores VEGF, PlGF y TGF en el plasma sangu&iacute;neo, por lo que estos no pueden llegar a interaccionar con sus respectivos receptores en la membrana de las c&eacute;lulas endoteliales, lo que ocasiona la subsecuente disfunci&oacute;n endotelial que en la madre se manifiesta por hipertensi&oacute;n y proteinuria<sup>50&#45;54</sup>. De hecho, la administraci&oacute;n de anticuerpos anti VEGF ocasionan la aparici&oacute;n de proteinuria<sup>55</sup>. Son variados los factores que participan en la liberaci&oacute;n de sFlt&#45;1 y sEng, entre ellos destacan los anticuerpos contra el receptor de la angiotensina II<sup>56</sup>. Recientemente se han desarrollado sustancias llamadas se&ntilde;uelos <i>(decoys)</i> que no son anticuerpos y que tienen la propiedad de fijar sustancias en el plasma sangu&iacute;neo. De estas, el aflibercept, se&ntilde;uelo del VEGF, fija al VEGF antes de que alcance a su receptor en las c&eacute;lulas endoteliales<sup>57</sup>. El aflibercept se ha utilizado exitosamente en el tratamiento de varios tipos de c&aacute;ncer para evitar la angiog&eacute;nesis y as&iacute; frenar la met&aacute;stasis. Como era de esperarse, los efectos adversos del aflibercept son hipertensi&oacute;n y proteinuria<sup>57</sup>, puesto que impide la fijaci&oacute;n del VEGF a su receptor.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>MARCADORES BIOL&Oacute;GICOS DE PREECLAMPSIA</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Porque la preeclampsia es una enfermedad que puede poner en peligro tanto la vida de la madre como del producto, muchos esfuerzos se han llevado a cabo a fin de desarrollar una t&eacute;cnica que permita predecir quien desarrollar&aacute; dicha enfermedad antes de que exista cualquier evidencia cl&iacute;nica. En este sentido, los 2 marcadores m&aacute;s prometedores son sFlt&#45;1 y la sEng, puesto que ambos aumentan semanas antes de que la mujer presente preeclampsia<sup>58,59</sup>. Es probable que m&uacute;ltiples hospitales logren cuantificar dichas sustancias a fin de detectar a las pacientes en riesgo potencial de desarrollar preeclampsia. Al hacerlo as&iacute;, debe tenerse presente que la sEng aumenta tambi&eacute;n en mujeres mult&iacute;paras en comparaci&oacute;n con las que cursan con un embarazo normal<sup>58</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">El aumento en la liberaci&oacute;n de sustancias vasoconstrictoras como la endotelina y tromboxano A<sub>2</sub>, as&iacute; como la disminuci&oacute;n en la producci&oacute;n de sustancias vasorelajadoras como &oacute;xido n&iacute;trico (NO) y prostaciclina (PGI<sub>2</sub>) y una mayor sensibilidad a angiotensina II, sustancia que se reconoce por su actividad vasoconstrictora, as&iacute; como tambi&eacute;n de un aumento en la concentraci&oacute;n s&eacute;rica del sFmlt&#45;1 y de la sEng, que son los receptores de los factores VEGF y TGF, respectivamente, con la consecuente disminuci&oacute;n de &eacute;stos, conduce a los signos y s&iacute;ntomas de la preeclampsia. Aunque se han propuesto varias sustancias como marcadores biol&oacute;gicos de preeclampsia, no han alcanzado el nivel de confiabilidad para incorporarlos como pruebas de detecci&oacute;n masiva, aunque el sFlt&#45;1 y la sEng podr&iacute;an llegar a utilizarse para dicho fin.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS BIBLIOGR&Aacute;FICAS</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Roberts JM, Cooper DW. Pathogenesis and genetics of pre&#45;eclampsia. 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<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Roberts]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Cooper]]></surname>
<given-names><![CDATA[DW]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Pathogenesis and genetics of pre-eclampsia]]></article-title>
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