<?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>S0026-17422017000500036</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Células T reguladoras tímicas: su origen, función e importancia en la salud y la enfermedad]]></article-title>
<article-title xml:lang="en"><![CDATA[Thymic regulatory T cells: origins, role and their importance in illnes and health]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez Sánchez]]></surname>
<given-names><![CDATA[Francisco Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Lemus]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fortoul van der Goes]]></surname>
<given-names><![CDATA[Teresa I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tenorio Zumárraga]]></surname>
<given-names><![CDATA[Eda Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Bioquímica]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Biología Celular y Tisular]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2017</year>
</pub-date>
<volume>60</volume>
<numero>5</numero>
<fpage>36</fpage>
<lpage>44</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422017000500036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422017000500036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422017000500036&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las células T reguladoras (Treg) son mediadoras fundamentales de la respuesta inmune, cuentan con una serie de mecanismos supresores que les permite controlar tanto clonas autorreactivas como linfocitos T convencionales. Si bien esta población corresponde únicamente al 5-10% de las células CD4+, su ausencia se ha relacionado con el desarrollo de patologías autoinmunes, condiciones proinflamatorias e incluso con abortos. Las células Treg pueden originarse tanto en el timo como en la periferia, sin embargo, aquellas originadas en el timo se caracterizan por su fenotipo estable y por su capacidad para reconocer autoantígenos. El objetivo de esta revisión es ofrecer al lector una visión general de las características de las células Treg así como su importancia en el contexto de diversas patologías; nos enfocaremos especialmente en los mecanismos y moléculas involucradas en la ontogenia de las células Treg de origen tímico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Regulatory &#1058; cells (Tregs) are key mediators of the immune response; they have a collection of suppressive mechanisms that allow them to control both, self-reactive lymphocytes and conventional T cell clones. Although this population corresponds only to 5-10% of the CD4Tcells compartment, their absence has been related to the development of autoimmunity, the worsening of proinflammatory conditions and even abortions. Tregs can originate at the thymus or the periphery, however thymic Tregs are characterized by their stable phenotype and their capacity to recognize auto-antigens. In this review, we aim to provide a general understanding of the characteristics of Tregs and their importance within pathologies with a special focus on thymic Tregs; we offer herein a general picture of T cell ontogeny emphasizing the mechanisms and molecules involved in Treg generation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Autoinmunidad]]></kwd>
<kwd lng="es"><![CDATA[tolerancia]]></kwd>
<kwd lng="es"><![CDATA[timo]]></kwd>
<kwd lng="es"><![CDATA[linfocitos TCD4 &#1170;&#1086;&#1093;&#1088;&#1047;]]></kwd>
<kwd lng="en"><![CDATA[Autoimmunity]]></kwd>
<kwd lng="en"><![CDATA[tolerance]]></kwd>
<kwd lng="en"><![CDATA[thymus]]></kwd>
<kwd lng="en"><![CDATA[CD4 T lymphocytes &#1170;&#1086;&#1093;&#1088;&#1047;]]></kwd>
</kwd-group>
</article-meta>
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