<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762007000100009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Compuestos disruptores endocrinos y su participación en la programación del eje reproductivo]]></article-title>
<article-title xml:lang="en"><![CDATA[Endocrine disruptor compounds and their role on the developmental programming of the reproductive axis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zambrano]]></surname>
<given-names><![CDATA[Elena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Biología de la Reproducción ]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<volume>59</volume>
<numero>1</numero>
<fpage>73</fpage>
<lpage>81</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762007000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762007000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762007000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Different perturbations during fetal and post natal development unleash endocrine adaptations that permanently alter metabolism, increasing the susceptibility to develop later disease, process known as "developmental programming"'. Endocrine disruptor compounds (EDC) are widely spread on the environment and display estrogenic, anti-estrogenic or anti-androgenic activity; they are lypophilyc and stored for long periods on the adipose tissue. Maternal exposure to EDC during pregnancy and lactation produces the exposure of the fetus and neonate through placenta and breast milk. Epidemiological and experimental studies have demonstrated reproductive alterations as a consequence of intrauterine and/or neonatal exposure to EDC. Diethystilbestrol (DES) is the best documented compound, this synthetic estrogen was administered to pregnant women at the BO and 60 to prevent miscarriage. It was implicated in urogenital abnormalities in children exposed in utero and withdrawn from the market. The "DES daughters" are women with high incidence of vaginal hypoplasia, spontaneous abortion, premature delivery, uterine malformation, menstrual abnormalities and low fertility. The "DES sons" show testicular dysgenesis syndrome, which is characterized by hypospadias, cryptorchidism and low semen quality. This entity is also associated to the fetal exposure to anti-androgens as flutamide. The effects on the reproductive axis depend on the stage of development and the window of exposure, as well as the dose and the compound. The wide distribution of EDC into the environment affects both human health and ecosystems in general, the study of their mechanisms of action is extremely important currently.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Diversas perturbaciones durante el desarrollo fetal y posnatal desencadenan adaptaciones endocrinas que modifican permanentemente el metabolismo, incrementando la susceptibilidad para el desarrollo de enfermedades, proceso conocido como "programación durante el desarrollo". Los compuestos disruptores endocrinos (CDE) se encuentran en el medio ambiente y presentan actividad estrogénica, antiestrogénica o antiandrogénica; son altamente lipofílicos y se almacenan por periodos prolongados en el tejido adiposo. La exposición materna a CDE durante el embarazo y la lactancia permite su paso al producto a través de la placenta y la leche materna. Estudios epidemiológicos y experimentales han demostrado alteraciones en el eje reproductivo como consecuencia de la exposición intrauterina y/o neonatal a CDE. El compuesto mejor documentado es el dietilestilbestrol (DES), este estrógeno sintético fue administrado a mujeres embarazadas durante los 50s y 60s y retirado del mercado por su implicación en anormalidades urogenitales de los bebés expuestos in útero. Las denominadas "hijas del DES" son mujeres con alta incidencia de hipoplasia vaginal, malformaciones uterinas, irregularidades menstruales, baja fertilidad y alta prevalencia de aborto espontáneo y parto prematuro. Por su parte, "los hijos del DES" presentan una entidad clínica conocida como síndrome de disgenesia testicular caracterizado por hipospadias, criptorquidia y baja calidad del semen. Este síndrome también se asocia a la exposición fetal a compuestos antiandrogénicos como la ñutamida. Los efectos en el eje reproductivo dependen del estadio de desarrollo y del tiempo de exposición, así como de la dosis y el compuesto del que se trate. La extensa presencia de CDE en el ambiente afecta la salud humana e impacta al ecosistema en general por lo cual es de suma importancia el estudio de los mecanismos involucrados en su acción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Endocrine disruptor compounds]]></kwd>
<kwd lng="en"><![CDATA[Reproductive axis]]></kwd>
<kwd lng="en"><![CDATA[Developmental programming]]></kwd>
<kwd lng="es"><![CDATA[Compuestos disruptores endocrinos]]></kwd>
<kwd lng="es"><![CDATA[Eje reproductivo]]></kwd>
<kwd lng="es"><![CDATA[Programación durante el desarrollo]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Rinc&oacute;n del residente</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Compuestos disruptores endocrinos y su participaci&oacute;n en la programaci&oacute;n del eje reproductivo</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Endocrine disruptor compounds and their role on the developmental programming of the reproductive axis</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Carolina Guzm&aacute;n,* Elena Zambrano*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Biolog&iacute;a de la Reproducci&oacute;n, Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.</i></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>Reimpresos:</b><i>    <br>   </i><i>Dra. Carolina Guzm&aacute;n&#150;Arriaga<b>    <br>   </b>Departamento de Biolog&iacute;a de la Reproducci&oacute;n    <br>   Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n    <br>   Vasco de Quiroga No. 15, Tlalpan    <br>   14000, M&eacute;xico, D.F.    <br>   Tel: (52) 55 5487&#150;0900 Ext. 2417 Fax: (52) 55 5655&#150;9859</i>    <br> Correo electr&oacute;nico: <a href="mailto:carova@prodigy.net.mx">carova@prodigy.net.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Recibido el 5 de julio de 2006.     ]]></body>
<body><![CDATA[<br> Aceptado el 12 de diciembre de 2006.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>ABSTRACT</i></b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Different perturbations during fetal and post natal development unleash endocrine adaptations that permanently alter metabolism, increasing the susceptibility to develop later disease, process known as "developmental programming"</i>'. <i>Endocrine disruptor compounds (EDC) are widely spread on the environment and display estrogenic, anti&#150;estrogenic or anti&#150;androgenic activity; they are lypophilyc and stored for long periods on the adipose tissue. Maternal exposure to EDC during pregnancy and lactation produces the exposure of the fetus and neonate through placenta and breast milk. Epidemiological and experimental studies have demonstrated reproductive alterations as a consequence of intrauterine and/or neonatal exposure to EDC. Diethystilbestrol (DES) is the best documented compound, this synthetic estrogen was administered to pregnant women at the BO and 60 to prevent miscarriage. It was implicated in urogenital abnormalities in children exposed in utero and withdrawn from the market. The "DES daughters" are women with high incidence of vaginal hypoplasia, spontaneous abortion, premature delivery, uterine malformation, menstrual abnormalities and low fertility. The "DES sons" show testicular dysgenesis syndrome, which is characterized by hypospadias, cryptorchidism and low semen quality. This entity is also associated to the fetal exposure to anti&#150;androgens as flutamide. The effects on the reproductive axis depend on the stage of development and the window of exposure, as well as the dose and the compound. The wide distribution of EDC into the environment affects both human health and ecosystems in general, the study of their mechanisms of action is extremely important currently.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key words. </i></b><i>Endocrine disruptor compounds. Reproductive axis. Developmental programming.</i></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">Diversas perturbaciones durante el desarrollo fetal y posnatal desencadenan adaptaciones endocrinas que modifican permanentemente el metabolismo, incrementando la susceptibilidad para el desarrollo de enfermedades, proceso conocido como "programaci&oacute;n durante el desarrollo". Los compuestos disruptores endocrinos (CDE) se encuentran en el medio ambiente y presentan actividad estrog&eacute;nica, antiestrog&eacute;nica o antiandrog&eacute;nica; son altamente lipof&iacute;licos y se almacenan por periodos prolongados en el tejido adiposo. La exposici&oacute;n materna a CDE durante el embarazo y la lactancia permite su paso al producto a trav&eacute;s de la placenta y la leche materna. Estudios epidemiol&oacute;gicos y experimentales han demostrado alteraciones en el eje reproductivo como consecuencia de la exposici&oacute;n intrauterina y/o neonatal a CDE. El compuesto mejor documentado es el dietilestilbestrol (DES), este estr&oacute;geno sint&eacute;tico fue administrado a mujeres embarazadas durante los 50s y 60s y retirado del mercado por su implicaci&oacute;n en anormalidades urogenitales de los beb&eacute;s expuestos <i>in &uacute;tero. </i>Las denominadas "hijas del DES" son mujeres con alta incidencia de hipoplasia vaginal, malformaciones uterinas, irregularidades menstruales, baja fertilidad y alta prevalencia de aborto espont&aacute;neo y parto prematuro. Por su parte, "los hijos del DES" presentan una entidad cl&iacute;nica conocida como s&iacute;ndrome de disgenesia testicular caracterizado por hipospadias, criptorquidia y baja calidad del semen. Este s&iacute;ndrome tambi&eacute;n se asocia a la exposici&oacute;n fetal a compuestos antiandrog&eacute;nicos como la &ntilde;utamida. Los efectos en el eje reproductivo dependen del estadio de desarrollo y del tiempo de exposici&oacute;n, as&iacute; como de la dosis y el compuesto del que se trate. La extensa presencia de CDE en el ambiente afecta la salud humana e impacta al ecosistema en general por lo cual es de suma importancia el estudio de los mecanismos involucrados en su acci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave. </b>Compuestos disruptores endocrinos. Eje reproductivo. Programaci&oacute;n durante el desarrollo.</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>INTRODUCCI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">El t&eacute;rmino "programaci&oacute;n durante el desarrollo" define al proceso mediante el cual condiciones adversas durante las etapas tempranas de la vida, ya sea fetal o posnatal, incrementan la susceptibilidad a padecer enfermedades en la edad adulta. Estudios epidemiol&oacute;gicos retrospectivos en diversas poblaciones humanas relacionan el bajo peso al nacimiento con hipertensi&oacute;n,<sup>1</sup> enfermedades coronarias,<sup>2</sup> diabetes tipo 2, resistencia a la insulina, intolerancia a la glucosa,<sup>3</sup> y obesidad,<sup>4</sup> entre otras. Con base en este tipo de investigaciones se propone que las principales enfermedades del adulto se originan en los estadios m&aacute;s tempranos de la vida.<sup>5</sup> El crecimiento y desarrollo fetal e infantil constituyen los periodos de mayor plasticidad celular y dependen en gran medida, adem&aacute;s del componente gen&eacute;tico, del ambiente intrauterino y posnatal en que se desenvuelve el individuo. En consecuencia, las etapas fetal y neonatal son las de mayor riesgo en la programaci&oacute;n de la salud y la enfermedad.<sup>3,</sup><sup>6</sup> La exposici&oacute;n materna a diferentes perturbaciones durante el embarazo y la lactancia, tiene consecuencias adversas en el fenotipo de su descendencia.</font></p>     <p align="justify"><font face="verdana" size="2">El eje reproductivo es susceptible de programaci&oacute;n por distintas influencias ambientales, como la nutrici&oacute;n materna durante el embarazo y la lactancia.<sup>7,</sup><sup>8</sup> En a&ntilde;os recientes se ha observado la creciente prevalencia de infertilidad o subfertilidad masculina asociada con baja calidad del semen y alta incidencia de c&aacute;ncer testicular.<sup>9</sup> Mientras que en la mujer se han identificado baja fertilidad, anormalidades menstruales y tumores urogenitales.<sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">Estas alteraciones cl&iacute;nicas han sido asociadas con la exposici&oacute;n prenatal, y en general durante periodos cr&iacute;ticos del desarrollo, a diferentes contaminantes de origen industrial denominados en conjunto compuestos disruptores endocrinos (CDE). Los CDE se definen como sustancias ex&oacute;genas que pueden actuar como agonistas o antagonistas hormonales alterando la s&iacute;ntesis, almacenamiento y metabolismo hormonal,<sup>11</sup> y que tienen la capacidad de actuar en organismos intactos, as&iacute; como en su descendencia.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2">Estas alteraciones, programadas por la exposici&oacute;n fetal y neonatal a compuestos qu&iacute;micos presentes en el medio ambiente, afectan la fisiolog&iacute;a normal del eje reproductivo, originando cambios a diferentes niveles del eje hipot&aacute;lamo&#150;hip&oacute;fisis&#150;g&oacute;nada.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>COMPUESTOS DISRUPTORES ENDOCRINOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Los CDE pueden ser tanto de origen natural (ejemplo: los fitoestr&oacute;genos contenidos en la soya) como de origen industrial (ejemplo: los residuos producidos en la fabricaci&oacute;n de pinturas y pl&aacute;sticos), o bien otros compuestos sint&eacute;ticos empleados por el hombre con diversos fines (ejemplo: plaguicidas como el DDT). Estos compuestos pueden tener actividad estrog&eacute;nica, antiestrog&eacute;nica, antiandrog&eacute;nica, o pueden interactuar con otros ejes neuroendocrinos como el eje tiroideo, as&iacute; como con el sistema inmune, e incluso pueden tener m&aacute;s de un tipo de actividad.<sup>13</sup> En general, estos compuestos son altamente lipof&iacute;licos, lo que permite su almacenamiento por periodos prolongados en el tejido adiposo.<sup>11</sup> La existencia de ventanas cr&iacute;ticas durante el desarrollo y maduraci&oacute;n del eje reproductivo produce variaciones en los efectos del CDE, por lo cual el periodo de exposici&oacute;n, as&iacute; como la dosis juegan un papel crucial en la programaci&oacute;n de alteraciones fenot&iacute;picas. En el embarazo, el feto puede ser expuesto a diferentes CDE por v&iacute;a transplacentaria; y durante la lactancia, a trav&eacute;s de la leche, debido a la movilizaci&oacute;n de las reservas lip&iacute;dicas maternas, necesaria para satisfacer la demanda energ&eacute;tica del reci&eacute;n nacido lactante<sup>14</sup> (<a href="/img/revistas/ric/v59n1/a9f1.jpg" target="_blank">Figura 1</a>).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>COMPUESTOS ESTROG&Eacute;NICOS</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Existe una gran cantidad de CDE con actividad estrog&eacute;nica, que incluye contaminantes de origen industrial (ejemplos: octilfenol y bisfenol A) y fitoestr&oacute;genos (ejemplos: geniste&iacute;na y daidze&iacute;na); sin embargo, el CDE m&aacute;s ampliamente documentado es el xenoestr&oacute;geno dietilestilbestrol (DES). Este compuesto es un estr&oacute;geno sint&eacute;tico, cuyo mecanismo de acci&oacute;n, al igual que el del 17&beta;&#150;estradiol, es activar los receptores de estr&oacute;genos alfa<sup>15</sup> y beta.<sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">Este CDE fue ampliamente utilizado durante las d&eacute;cadas de los 50s y 60s para prevenir abortos espont&aacute;neos y otras complicaciones del embarazo. En los 70s el DES fue retirado del mercado por su implicaci&oacute;n en la creciente incidencia de anormalidades urogenitales en las ni&ntilde;as y ni&ntilde;os expuestos <i>in &uacute;tero.</i><sup>11</sup> Las denominadas "hijas del DES" son mujeres con alta tasa de displasia cervical,<sup>18</sup> hipoplasia vaginal, adenoma vaginal de c&eacute;lulas claras y malformaciones uterinas,<sup>17,</sup><sup>19</sup> irregularidades menstruales, disminuci&oacute;n de fertilidad,<sup>17</sup> as&iacute; como embarazo ect&oacute;pico, aborto espont&aacute;neo y parto prematuro.<sup>20 </sup>Mientras que los "hijos del DES" presentan quistes epididimales, hipospadias, criptorquidia y baja calidad del semen.<sup>9</sup>'<sup>17</sup> La exposici&oacute;n fetal en los periodos susceptibles del desarrollo, es la responsable de los efectos adversos del DES. Durante la vida intrauterina, en particular en el periodo correspondiente a la diferenciaci&oacute;n de tejidos reproductivos, el DES interact&uacute;a con los receptores a estr&oacute;genos, alterando la diferenciaci&oacute;n tisular, lo cual da como resultado malformaciones en genitales internos.<sup>21 </sup>Uno de los mecanismos propuestos para explicar la programaci&oacute;n durante el desarrollo es la adquisici&oacute;n de improntas gen&oacute;micas.<sup>6</sup> En el caso particular del DES en el periodo fetal, se ha descrito la expresi&oacute;n anormal del gen estr&oacute;geno dependiente de la lactoferrina, lo cual podr&iacute;a estar implicado en otras alteraciones reproductivas, particularmente uterinas.<sup>22</sup> La administraci&oacute;n de DES durante el desarrollo temprano muestra efectos similares en diversas especies animales como la oveja<sup>11</sup> y el rat&oacute;n<sup>23</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>). En animales de laboratorio, ha sido posible el estudio de los efectos de DES incluso a nivel hipotal&aacute;mico e hipofisario. En ratas hembras se ha observado la masculinizaci&oacute;n hipotal&aacute;mica,<sup>24</sup> as&iacute; como el incremento en las concentraciones circulantes de FSH y LH.<sup>25</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existe controversia con respecto a los efectos transgeneracionales de la exposici&oacute;n a DES en la vida intrauterina. Un ejemplo que apoya esta hip&oacute;tesis es el caso reportado recientemente de una mujer que desarroll&oacute; carcinoma ov&aacute;rico y cuya abuela consumi&oacute; DES durante el embarazo,<sup>18</sup> en contraste algunos autores reportan ausencia de efectos de DES en las nietas.<sup>26</sup> Con respecto a los varones, se ha observado mayor riesgo de hipospadias cuando la madre fue expuesta a DES <i>in &uacute;tero.</i><sup>21</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las isoflavonas contenidas en la soya: geniste&iacute;na y daidze&iacute;na tambi&eacute;n presentan actividad estrog&eacute;nica. A pesar de que se conocen sus efectos protectores contra el c&aacute;ncer de seno y pr&oacute;stata en humanos y roedores,<sup>28,</sup><sup>29</sup> hay estudios controvertidos sobre la acci&oacute;n de estos fitoestr&oacute;genos durante el periodo neonatal sobre el eje reproductivo, ya que por un lado su administraci&oacute;n durante toda la lactancia en ratas incrementa el peso uterino, adelanta la pubertad y produce estro persistente,<sup>30</sup> mientras que otros autores reportan que la exposici&oacute;n a geniste&iacute;na al final de la lactancia no produce alteraciones en el desarrollo sexual.<sup>29</sup> El eje reproductivo es altamente sensible a las acciones hormonales en el periodo neonatal. Considerando que los fitoestr&oacute;genos activan los receptores de estr&oacute;genos,<sup>31</sup> es importante hacer un manejo adecuado de las f&oacute;rmulas l&aacute;cteas para reci&eacute;n nacidos que contengan soya.</font></p>     <p align="justify"><font face="verdana" size="2">Diferentes CDE de origen industrial como el octilfenol (compuesto relacionado con los detergentes, pl&aacute;sticos y pinturas) y el bisfenol A (predominante en los pl&aacute;sticos) han demostrado efectos estrog&eacute;nicos en animales de laboratorio,<sup>32,33</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>) y sugieren la existencia de ventanas de susceptibilidad durante el desarrollo temprano dependientes del sexo.</font></p>     <p align="justify"><font face="verdana" size="2">En animales de laboratorio, la administraci&oacute;n prenatal de CDE estrog&eacute;nicos diferentes a DES, como la geniste&iacute;na y el octilfenol, tambi&eacute;n se asocia con masculinizaci&oacute;n hipotal&aacute;mica<sup>30,</sup><sup>34</sup> y alteraciones en la secreci&oacute;n de FSH.<sup>35,</sup><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>COMPUESTOS ANTIESTROGENICOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Los compuestos derivados de dioxinas y compuestos similares a dioxinas como los bifenilos policlorados (PBC) se liberan al ambiente por plantas de incineraci&oacute;n. Son utilizados en pesticidas, solventes, pl&aacute;sticos, adem&aacute;s de ser los m&aacute;s estudiados por su actividad antiestrog&eacute;nica.<sup>37</sup> Los PCB se han identificado en animales y humanos, en muestras de sangre, tejido adiposo, placenta, cerebro y en la leche materna.<sup>38</sup> Las dioxinas y PCB funcionan como agonistas del receptor a arilcarbonos, este &uacute;ltimo interact&uacute;a con diversos receptores, como los receptores a estr&oacute;genos, y modifica su funci&oacute;n normal,<sup>39</sup> tambi&eacute;n est&aacute;n implicados en alteraciones del eje tiroideo.<sup>40</sup></font></p>     <p align="justify"><font face="verdana" size="2">El contacto con dioxinas previo a la pubertad aparentemente no tiene impacto en la edad de la menarca; sin embargo, a pesar de no ser significativo, las ni&ntilde;as expuestas a este compuesto antes de los ocho a&ntilde;os tienden a mostrar retraso en el inicio de la pubertad.<sup>41,</sup><sup>42</sup> La exposici&oacute;n temprana a este tipo de compuestos se relaciona con el alargamiento de los ciclos menstruales.<sup>43</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Tambi&eacute;n existen evidencias de la acci&oacute;n de los CDE antiestrog&eacute;nicos en el desarrollo de c&aacute;ncer de mama sensible a estr&oacute;genos. Las mujeres de Seveso, Italia (poblaci&oacute;n altamente expuesta a dioxinas por un accidente industrial en 1976), parecen tener menor incidencia de este tipo de c&aacute;ncer cuando el contacto con el CDE fue durante la infancia,<sup>44</sup> mientras que si el contacto fue durante la vida adulta la probabilidad de desarrollar diferentes tipos de c&aacute;ncer se incrementa.<sup>44,</sup><sup>45</sup></font></p>     <p align="justify"><font face="verdana" size="2">En roedores hembras expuestas a dioxinas durante la gestaci&oacute;n se han observado efectos antiestrog&eacute;nicos transgeneracionales<sup>46</sup> <a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">(Cuadro 1)</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>COMPUESTOS ANTIANDROG&Eacute;NICOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Los andr&oacute;genos desempe&ntilde;an un papel crucial en el desarrollo temprano de los machos, de ellos depende la masculiniz aci&oacute;n de los &oacute;rganos reproductivos y del cerebro. La exposici&oacute;n fetal a compuestos con actividad antagonista al receptor de andr&oacute;genos, o inhibidora de la s&iacute;ntesis de los mismos, es asociada con malformaciones urogenitales.<sup>9</sup> En el humano estas malformaciones, as&iacute; como la baja en la fertilidad masculina, forman parte del denominado s&iacute;ndrome de disgenesia testicular (SDT). De acuerdo con su grado de severidad, el cuadro cl&iacute;nico incluye uno o m&aacute;s de los siguientes s&iacute;ntomas: c&aacute;ncer testicular, hipospadias, criptorquidia y baja calidad del semen.<sup>9 </sup>En muchos casos la incidencia de SDT se asocia con la regi&oacute;n geogr&aacute;fica. En zonas conocidas por la presencia de contaminantes como el DDT y otros CDE, se ha observado alta incidencia de malformaciones urogenitales as&iacute; como baja proporci&oacute;n de machos respecto a hembras en la fauna silvestre.<sup>47</sup> La lista de CDE con actividad antiandrog&eacute;nica incluye pesticidas como el vinclozolin, y el DDE (metabolito bio&#150;acumulable y poco biodegradable del DDT). Tambi&eacute;n se encuentran compuestos de origen industrial como los ftalatos, dioxinas y PCB, as&iacute; como otros de uso farmacol&oacute;gico como la flutamida. Los ni&ntilde;os expuestos a DDE intrauterina o durante la lactancia presentan hipospadias, criptorquia y politelia.<sup>48</sup></font></p>     <p align="justify"><font face="verdana" size="2">En especies de roedores se ha documentado un cuadro similar al SDT por exposici&oacute;n prenatal a flutamida o ftalatos<sup>47,49</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>). Los hallazgos en estas especies incluyen ciertos mecanismos involucrados en la baja calidad del semen como el alto &iacute;ndice de apoptosis en los estadios andr&oacute;geno&#150;dependientes del desarrollo esperm&aacute;tico.<sup>50</sup> Adem&aacute;s se ha observado demasculinizaci&oacute;n hipotal&aacute;mica y conductual por la exposici&oacute;n fetal a dioxinas y PCB.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">En el caso de los antiandr&oacute;genos tambi&eacute;n se ha observado el paso transgeneracional de los efectos a nivel de c&eacute;lulas germinales. Para el caso particular del vinclozolin los ratones machos expuestos <i>in &uacute;tero </i>al CDE heredan las alteraciones en la l&iacute;nea germinal hasta por cuatro generaciones. Tales anomal&iacute;as incluyen baja cuenta esperm&aacute;tica debida a la alta incidencia de apoptosis aunada a la baja motilidad esperm&aacute;tica.<sup>12,</sup><sup>51</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los derivados de ftalatos son ampliamente utilizados en la fabricaci&oacute;n de pl&aacute;sticos, cosm&eacute;ticos y pol&iacute;meros como el PVC; est&aacute;n presentes en una gran variedad de materiales con que tenemos contacto cotidiano. En general, los derivados de ftalato no son compuestos con actividad antiandrog&eacute;nica, sino que est&aacute;n asociados con la inhibici&oacute;n de la bios&iacute;ntesis de andr&oacute;genos<sup>52</sup> con lo que conducen a malformaciones urogenitales similares a las ocasionadas por compuesto antagonistas del receptor de andr&oacute;genos.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la rata, la exposici&oacute;n fetal a ftalatos produce disminuci&oacute;n en la expresi&oacute;n testicular de enzimas esteroidog&eacute;nicas que se traduce en menor s&iacute;ntesis de testosterona<sup>52</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>). En roedores machos expuestos a dioxinas durante la gestaci&oacute;n se han observado efectos antiandrog&eacute;nicos que incluyen demasculinizaci&oacute;n morfol&oacute;gica y conductual<sup>47</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>).</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>COMPUESTOS QUE AFECTAN INDIRECTAMENTE AL EJE REPRODUCTIVO</b></font></p>     <p align="justify"><font face="verdana" size="2">La funci&oacute;n del eje reproductivo depende en gran medida de la correcta funci&oacute;n de otros ejes neuroendocrinos como el tiroideo,<sup>53</sup> por lo que la exposici&oacute;n a CDE que afectan este eje tiene severas repercusiones en la funci&oacute;n reproductiva. La exposici&oacute;n humana a PCB durante el embarazo disminuye las concentraciones circulantes de T3 en la madre,<sup>54</sup> lo cual puede da&ntilde;ar al feto, en particular femenino. Un ejemplo del da&ntilde;o provocado por la exposici&oacute;n fetal a este tipo de compuestos es el incremento de las concentraciones de T3, T4 libre y TBG con disminuci&oacute;n en TSH que se observa en muestras de sangre de beb&eacute;s femeninos y que sugiere menor sensibilidad hipotal&aacute;mica&#150;hipofisaria a T4 libre en las neonatas.<sup>40 </sup>Otros compuestos que alteran este eje son las sales percl&oacute;ricas empleadas en el tratamiento de la tiro&#150;toxicosis. El perclorato es un inhibidor competitivo en la captaci&oacute;n del yodo por las c&eacute;lulas foliculares de la tiroides y aumenta el metabolismo de las hormonas tiroideas.<sup>55</sup> En la hembra, las hormonas tiroideas son indispensables para el desarrollo y crecimiento folicular. En el estadio preantral, los fol&iacute;culos ov&aacute;ricos presentan numerosos sitios de uni&oacute;n para hormonas tiroideas,<sup>53</sup> por lo que en la rata hembra la administraci&oacute;n de CDE que afectan al eje tiroideo, tambi&eacute;n producen alteraciones reproductivas<sup>56,57</sup> (<a href="/img/revistas/ric/v59n1/a9c1.jpg" target="_blank">Cuadro 1</a>).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>PERSPECTIVAS Y CONCLUSIONES</b></font></p>     <p align="justify"><font face="verdana" size="2">En t&eacute;rminos de salud p&uacute;blica, es de gran relevancia el estudio de la programaci&oacute;n durante el desarrollo, ya que se ha demostrado el origen de enfermedades metab&oacute;licas como la diabetes tipo 2, la obesidad y la hipertensi&oacute;n. Las adaptaciones que sufre un individuo en los estadios m&aacute;s tempranos de su vida, y en respuesta al ambiente intrauterino y posnatal, modifican su organismo a nivel metab&oacute;lico para asegurar su supervivencia a corto plazo; sin embargo, estas mismas adaptaciones, aunque necesarias, pudieran no ser tan ben&eacute;ficas a largo plazo, y poner en riesgo la salud en la etapa adulta. La extensa presencia de CDE en el ambiente e incluso su acumulaci&oacute;n en diversas especies animales, algunas de consumo humano, impacta tanto a la salud como a los ecosistemas. En animales de vida silvestre se han observado alteraciones en la proporci&oacute;n machos:hembras como en el caso espec&iacute;fico de Florida, EU, donde la contaminaci&oacute;n con DDT no s&oacute;lo ha ocasionado graves alteraciones ambientales sino que en algunas especies como el lagarto se ha encontrado un alto grado de demasculinizaci&oacute;n.<sup>58</sup> Otra especie afectada en esta regi&oacute;n es la pantera, en que la exposici&oacute;n prenatal a CDE ha generado la feminizaci&oacute;n de los machos haci&eacute;ndolos menos aptos para la reproducci&oacute;n<sup>59</sup>. En las zonas geogr&aacute;ficas altamente contaminadas se han observado m&aacute;s casos como los anteriores en diversas especies de mam&iacute;feros, reptiles y peces; en tales &aacute;reas como es el caso de Rusia el consumo humano de carnes y pescados contaminados incrementa la exposici&oacute;n a CDE<sup>60</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">El estudio de la programaci&oacute;n del eje reproductivo por exposici&oacute;n temprana a CDE es de gran importancia. Su implicaci&oacute;n en la salud reproductiva de la descendencia incluye alteraciones en el desarrollo sexual, infertilidad y padecimientos como los observados en las "hijas del DES" y el SDT. A&uacute;n m&aacute;s, la posible adquisici&oacute;n de improntas gen&oacute;micas en respuesta al ambiente intrauterino y posnatal adverso, principalmente las generadas en la l&iacute;nea germinal, asegura el paso transgeneracional de tales padecimientos.<sup>51</sup> La exposici&oacute;n ocupacional de los padres es otro posible origen de alteraciones reproductivas y endocrinas que podr&iacute;an ser heredadas a los hijos por mecanismos no gen&oacute;micos (<a href="/img/revistas/ric/v59n1/a9f1.jpg" target="_blank">Figura 1</a>).</font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, muchos de estos compuestos pudieran tener m&aacute;s de un tipo de actividad endocrina, actuando como agonistas de un receptor y como antagonistas de otro, dependiendo del tejido, la concentraci&oacute;n e incluso el estadio de desarrollo. En esta revisi&oacute;n se rese&ntilde;an los efectos m&aacute;s importantes de la exposici&oacute;n durante el desarrollo temprano, pero hay que tomar en consideraci&oacute;n la diversidad de efectos que pudieran presentar compuestos como los PCB e incluso que en general, tanto humanos como animales de vida silvestre est&aacute;n expuestos simult&aacute;neamente a m&aacute;s de un compuesto presente en el ambiente.</font></p>     <p align="justify"><font face="verdana" size="2">La mayor parte de los efectos de los CDE han sido detectados mediante estudios epidemiol&oacute;gicos y cl&iacute;nicos; sin embargo, la experimentaci&oacute;n con animales nos permite, de una manera controlada, determinar los mecanismos celulares y moleculares implicados en la respuesta fisiol&oacute;gica observada. La integraci&oacute;n de los conocimientos generados por estos tres tipos de estudios debe ser una de las prioridades de los planes de salud as&iacute; como de la investigaci&oacute;n biom&eacute;dica. La identificaci&oacute;n de estos mecanismos ser&iacute;a la clave en la prevenci&oacute;n de enfermedades, no s&oacute;lo reproductivas, sino tambi&eacute;n metab&oacute;licas y permitir&iacute;a la intervenci&oacute;n m&eacute;dica en los estadios de vida m&aacute;s tempranos del desarrollo.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Carolina Guzm&aacute;n es estudiante del Programa de Doctorado en Ciencias Biom&eacute;dicas, Facultad de Medicina, Universidad Nacional Aut&oacute;noma de M&eacute;xico y fue apoyada por Conacyt (169728) y DGEP, UNAM.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Godfrey KM, Barker DJ, Peace J, Cloke J, Osmond C. 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