<?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>1405-888X</journal-id>
<journal-title><![CDATA[TIP. Revista especializada en ciencias químico-biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[TIP]]></abbrev-journal-title>
<issn>1405-888X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-888X2016000200109</article-id>
<article-id pub-id-type="doi">10.1016/j.recqb.2016.06.004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Papel del factor de bloqueo inducido por progesterona (PIBF) en embarazo y cáncer]]></article-title>
<article-title xml:lang="en"><![CDATA[Role of progesterone-induced blocking factor (PIBF) in pregnancy and cancer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Rodríguez]]></surname>
<given-names><![CDATA[Araceli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Arroyo]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Química ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>19</volume>
<numero>2</numero>
<fpage>109</fpage>
<lpage>115</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-888X2016000200109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-888X2016000200109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-888X2016000200109&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El factor de bloqueo inducido por progesterona (PIBF) es una proteína inmunomoduladora por medio de la cual la progesterona ejerce varios de sus efectos inmunológicos en diferentes células de alta proliferación, que incluyen desde células embrionarias hasta células tumorales. El PIBF ocasiona un incremento en la síntesis de anticuerpos asimétricos y de citocinas tipo Th2 como las interleucinas (IL) 4, 6 y 10, así como una disminución en la actividad citotóxica de las células NK y en la producción de citocinas tipo Th1, como el factor de necrosis tumoral alfa (TNF&#945;) e IL-12. Lo anterior provoca una reducción en la relación Th1/Th2 que es característica del embarazo sano, lo que tiene como consecuencia un aumento en la inmunidad humoral y una disminución en la inmunidad celular. Estos mecanismos inmunomoduladores tienen como resultado una evasión del sistema inmune de la madre por parte del feto para que el embarazo llegue a término. De manera interesante, diversos estudios sugieren que estos mismos mecanismos son utilizados por las células cancerosas para facilitar la progresión de tumores que presentan sobre-expresión del PIBF.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The progesterone-induced blocking factor (PIBF) is a protein that mediates the immunomodulatory effects of progesterone in cells with high proliferation rate, including embryonic and tumor cells. PIBF increases the synthesis of asymmetric antibodies and Th2 cytokines such as interleukins (IL) 4, 6 and 10, but decreases NK cells cytotoxic activity and Th1 cytokines such as tumor necrosis factor alpha (TNF&#945;) and IL-12. The former causes a reduction in the rate Th1/Th2 that is distinctive of a healthy pregnancy, which it provokes an increment in humoral immunity as well as a decrease in cellular immunity. These immunomodulatory mechanisms enable the fetus to evade the mother immune system allowing pregnancy proceeds to term. Interestingly, several studies suggest that these same mechanisms are used by cancer cells to facilitate progression of tumors that exhibit overexpression of PIBF.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer]]></kwd>
<kwd lng="es"><![CDATA[embarazo]]></kwd>
<kwd lng="es"><![CDATA[linfocitos]]></kwd>
<kwd lng="es"><![CDATA[PIBF]]></kwd>
<kwd lng="es"><![CDATA[progesterona]]></kwd>
<kwd lng="en"><![CDATA[cancer]]></kwd>
<kwd lng="en"><![CDATA[pregnancy]]></kwd>
<kwd lng="en"><![CDATA[lymphocytes]]></kwd>
<kwd lng="en"><![CDATA[PIBF]]></kwd>
<kwd lng="en"><![CDATA[progesterone]]></kwd>
</kwd-group>
</article-meta>
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