<?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>1794-2470</journal-id>
<journal-title><![CDATA[Nova]]></journal-title>
<abbrev-journal-title><![CDATA[Nova]]></abbrev-journal-title>
<issn>1794-2470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Colegio Mayor de Cundinamarca]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-24702014000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El receptor NKG2D en la frontera de la inmunovigilancia y la carcinogénesis]]></article-title>
<article-title xml:lang="en"><![CDATA[The NKG2D receptor in the border of immune surveillance and carcinogenesis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza Rincón]]></surname>
<given-names><![CDATA[Jorge Flavio]]></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 Zaragoza Unidad de Investigación Multidisciplinaria]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<volume>12</volume>
<numero>21</numero>
<fpage>37</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-24702014000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-24702014000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-24702014000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El sistema inmune es capaz de realizar la detección y eliminación de células transformadas por un mecanismo fisiológico conocido como inmunovigilancia. En este proceso participa el receptor activador NKG2D presente en linfocitos T y células NK, ambos de suma relevancia en la inmunovigilancia contra el cáncer. Al reconocer el receptor NKG2D a sus ligandos (NKG2DLs) en las células que experimentan neotransformación se desencadena la respuesta lítica específica de las células linfoides citotóxicas. Asimismo, se ha descrito en diversos tipos de cáncer formas solubles de NKG2DLs que se ha demostrado son utilizadas para la evasión tumoral al saturar los receptores NKG2D presentes en las células efectoras linfoides evitando de esta manera ser reconocidas y eliminadas y, con ello escapando de la inmunovigilancia. Aunque este fenómeno de evasión inmune, donde participan algunos NKG2DLs, ha sido ya descrito y corroborado clínicamente no se ha estudiado si el receptor NKG2D está presente en las células tumorales per se ya que también podría estar implicado en subvertir la inmunovigilancia. En este trabajo se analizan evidencias recientes de que la expresión del receptor NKG2D no es exclusiva de linfocitos T y NK ya es expresado por células epiteliales tumorales tanto in vitro como in vivo. Las consecuencias de esta anómala expresión en células no linfoides tiene amplias implicaciones en la carcinogénesis que serán revisadas. También se analizan estudios clínicos recientes donde se comprueba la participación del receptor NKG2D en diferentes patologías tumorales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The immune system is able to perform the detection and elimination of transformed cells by a mechanism known as physiological immune surveillance. This process involves the NKG2D receptor activator present in T lymphocytes and NK cells, both of paramount importance in the immune surveillance against cancer. To recognize the receptor NKG2D ligands (NKG2DLs) in cells that experience retransformation triggers the specific lithic response of the cytotoxic lymphoid cells. Also, soluble forms of NKG2DLs have been described in various types of cancer that have proven to be used for tumor evasion by saturating the NKG2D receptors present in the effector lymphoid cells thus avoiding their recognition and elimination, which makes them escape immune surveillance. Although this phenomenon of immune evasion, where some NKG2DLs participate, has already been described and corroborated, clinically, it has not been studied whether the receptor NKG2DL is present in the tumor cells per se because it could also be involved in reversing immune surveillance. This paper analyzes recent evidence that the expression of the NKG2D receptor is not lymphocyte T and NK exclusive it is already expressed by tumor epithelial cells in vitro and in vivo. Consequences of this anomalous expression in non-lymphoid cells have widespread implications in carcinogenesis, which will be revised. Recent clinical studies to prove the participation of NKG2D receptor in several tumor pathologies are analyzed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[carcinogénesis]]></kwd>
<kwd lng="es"><![CDATA[inmunovigilancia]]></kwd>
<kwd lng="es"><![CDATA[NKG2D]]></kwd>
<kwd lng="es"><![CDATA[NKG2DL]]></kwd>
<kwd lng="en"><![CDATA[carcinogenesis]]></kwd>
<kwd lng="en"><![CDATA[immune surveillance]]></kwd>
<kwd lng="en"><![CDATA[NKG2D]]></kwd>
<kwd lng="en"><![CDATA[NKG2DL]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="center"><font size="4"><b>El receptor NKG2D en la frontera de la inmunovigilancia y la carcinog&eacute;nesis</b></font></p>      <p align="center"><font size="3"><b>The  NKG2D receptor in the border of immune surveillance and  carcinogenesis</b></font></p>      <p align="center"><i>Jorge Flavio Mendoza Rinc&oacute;n</i><sup>1</sup> DSc </p>      <p><sup>1</sup> Unidad de Investigaci&oacute;n  Multidisciplinaria, Facultad de Estudios Superiores Zaragoza. Universidad  Nacional Aut&oacute;noma de M&eacute;xico. M&eacute;xico</p>      <p><b>Correo electr&oacute;nico: </b><a href="mailto:mendozajf@yahoo.com">mendozajf@yahoo.com</a> / <a href="mailto:jflavio.m@gmail.com">jflavio.m@gmail.com</a></p>      <p><b>Recibido: </b>11/02/2014  <b>Aceptado: </b>28/05/2014 </p><hr/>     <p><b>RESUMEN</b></p>      <p>El  sistema inmune es capaz de realizar la detecci&oacute;n y eliminaci&oacute;n de c&eacute;lulas  transformadas por un mecanismo fisiol&oacute;gico conocido como inmunovigilancia. En  este proceso participa el receptor activador NKG2D presente en linfocitos T y  c&eacute;lulas NK, ambos de suma relevancia en la inmunovigilancia contra el c&aacute;ncer.  Al reconocer el receptor NKG2D a sus ligandos (NKG2DLs) en las c&eacute;lulas que experimentan  neotransformaci&oacute;n se desencadena la respuesta l&iacute;tica espec&iacute;fica de las c&eacute;lulas  linfoides citot&oacute;xicas. Asimismo, se ha descrito en diversos tipos de c&aacute;ncer  formas solubles de NKG2DLs que se ha demostrado son utilizadas para la evasi&oacute;n  tumoral al saturar los receptores NKG2D presentes en las c&eacute;lulas efectoras  linfoides evitando de esta manera ser reconocidas y eliminadas y, con ello escapando  de la inmunovigilancia. Aunque este fen&oacute;meno de evasi&oacute;n inmune, donde  participan algunos NKG2DLs, ha sido ya descrito y corroborado cl&iacute;nicamente no  se ha estudiado si el receptor NKG2D est&aacute; presente en las c&eacute;lulas tumorales <i>per  se</i> ya que tambi&eacute;n podr&iacute;a estar implicado en subvertir la inmunovigilancia.  En este trabajo se analizan evidencias recientes de que la expresi&oacute;n del  receptor NKG2D no es exclusiva de linfocitos T y NK ya es expresado por c&eacute;lulas  epiteliales tumorales tanto <i>in</i> <i>vitro </i>como<i> in vivo</i>. Las  consecuencias de esta an&oacute;mala expresi&oacute;n en c&eacute;lulas no linfoides tiene amplias implicaciones en la carcinog&eacute;nesis que ser&aacute;n revisadas. Tambi&eacute;n se analizan  estudios cl&iacute;nicos recientes donde se comprueba la participaci&oacute;n del receptor  NKG2D en diferentes patolog&iacute;as tumorales.</p>      <p><b><i>Palabras clave</i></b>: carcinog&eacute;nesis, inmunovigilancia, NKG2D, NKG2DL.</p><hr/>     ]]></body>
<body><![CDATA[<p><b>ABSTRACT</b></p>      <p>The immune system is able to perform the detection  and elimination of transformed cells by a mechanism known as physiological  immune surveillance. This process involves the NKG2D receptor activator present  in T lymphocytes and NK cells, both of paramount importance in the immune  surveillance against cancer. To recognize the receptor NKG2D ligands (NKG2DLs)  in cells that experience retransformation triggers the specific lithic response  of the cytotoxic lymphoid cells. Also, soluble forms of NKG2DLs have been  described in various types of cancer that have proven to be used for tumor  evasion by saturating the NKG2D receptors present in the effector lymphoid  cells thus avoiding their recognition and elimination, which makes them escape  immune surveillance. Although this phenomenon of immune evasion, where some  NKG2DLs participate, has already been described and corroborated, clinically,  it has not been studied whether the receptor NKG2DL is present in the tumor  cells per se because it could also be involved in reversing immune surveillance.  This paper analyzes recent evidence that the expression of the NKG2D receptor  is not lymphocyte T and NK exclusive it is already expressed by tumor  epithelial cells in vitro and in vivo. Consequences of this anomalous  expression in non-lymphoid cells have widespread implications in carcinogenesis,  which will be revised. Recent clinical studies to prove the participation of  NKG2D receptor in several tumor pathologies are analyzed.</p>      <p><b><i>Key Words</i>: </b>carcinogenesis,  immune surveillance, NKG2D, NKG2DL.</p><hr/>     <p><b>INTRODUCCI&Oacute;N</b></p>      <p>La revisi&oacute;n del tema se organiza en tres apartados. En  el primero, se describe las funciones del receptor activador de linfocitos  citot&oacute;xicos NKG2D; en el segundo, se establece el papel del receptor NKG2D  contra tumores; en el tercero, se puntualiza la funci&oacute;n del receptor NKG2D como  oncoprote&iacute;na. Finalmente, y considerando la importancia del receptor NKG2D se  plantea la posibilidad de utilizar la presencia de NKG2D para diagn&oacute;stico,  progresi&oacute;n y terapia en diversas condiciones oncol&oacute;gicas.</p>      <p><b>El receptor activador de linfocitos citot&oacute;xicos NKG2D</b></p>      <p>El receptor activador de  c&eacute;lulas NK grupo 2, miembro D (NKG2D) pertenece a los receptores  transmembranales tipo 2 relacionados a las lectinas expresado como homod&iacute;mero  principalmente en c&eacute;lulas T citot&oacute;xicas del sistema innato (NK) (1,2) como  adaptativo (linfocitos CD8+) (3,4). Aunque tambi&eacute;n se ha demostrado su presencia  en linfocitos NKT (5,6), en linfocitos T con receptores Î³ &Oslash; (7,8) y en ciertas subpoblaciones de linfocitos CD4  (9,10) <a href="#t1">Tabla 1.</a></p>      <p align="center"><a name="t1"></a><img src="img/revistas/nova/v12n21/v12n21a03t01.jpg"></p>      <p>El receptor NKG2D reconoce a sus ligandos conocidos  gen&eacute;ricamente NKG2DLs algunos emparentados a mol&eacute;culas de clase I humanas entre  los que se encuentran MICA y MICB (11,12) as&iacute; como mol&eacute;culas relacionadas con  la prote&iacute;na viral UL16 denominadas ULBPs (13,14). Es importante mencionar que  los MICs y ULBPs son expresados b&aacute;sicamente en condiciones de estr&eacute;s  fisiol&oacute;gico, esto es en infecciones virales y transformaci&oacute;n maligna ya que en  condiciones normales su expresi&oacute;n es baja o nula (15,16). Por lo que respecta  al gen que codifica al receptor NKG2D se denomina KLRK1 (killer cell lectinlike  receptor subfamily member 1, por sus siglas en ingl&eacute;s) y se encuentra  localizado en el complejo de genes NK (NKC por sus siglas en ingl&eacute;s) en el  cromosoma 12 humano, <a href="#f1">Figura 1</a>. Tanto MICA, MICB como las ULBP son mol&eacute;culas  expresadas en condiciones de estr&eacute;s celular y se presentan en la membrana de  las c&eacute;lulas inmunocomprometidas que incluyen tumores de origen epitelial,  c&eacute;lulas leuc&eacute;micas (17), as&iacute; como en c&eacute;lulas infectadas por virus (18), por  estr&eacute;s nutricional (19), hipoxia (20) y da&ntilde;o al ADN (21), entre otras  condiciones.</p>      <p align="center"><a name="f1"></a><img src="img/revistas/nova/v12n21/v12n21a03f01.jpg"></p>      ]]></body>
<body><![CDATA[<p>De esta manera, los ligandos  NKG2DLs pueden ser reconocidos por el receptor activador NKG2D y con ello  desencadenar la actividad l&iacute;tica caracter&iacute;stica de las c&eacute;lulas citot&oacute;xicas T y  NK y la subsecuente eliminaci&oacute;n de las c&eacute;lulas bajo estr&eacute;s y tumorales (22).  Adicionalmente, la secreci&oacute;n de MICA, MICB y de ULBPs por varios tipos de  c&eacute;lulas cancerosas se ha sugerido como un mecanismo de escape inmune utilizado  por el tumor que provoca la saturaci&oacute;n de los receptores NKG2D en las c&eacute;lulas  citot&oacute;xicas imposibilitando ser reconocidas y eliminadas por ellas (23, 24). De  hecho, se ha detectado elevados niveles de MICA, MICB y algunas ULBPs en el  suero de pacientes con diversos tipos de c&aacute;ncer encontr&aacute;ndose una correlaci&oacute;n  directa entre el incremento de estas mol&eacute;culas y un mal pron&oacute;stico, <a href="#t2">Tabla 2</a>.</p>      <p align="center"><a name="t2"></a><img src="img/revistas/nova/v12n21/v12n21a03t02.jpg"></p>      <p><b>El receptor NKG2D y  su funci&oacute;n en la inmunovigilancia contra tumores</b></p>      <p>En la d&eacute;cada de  los 50's, Thomas y Burnet desarrollaron la teor&iacute;a de inmunovigilancia  antitumoral (25,26). Establecieron que el sistema inmune se encuentra en estado  de alerta antitumoral permanente con capacidad de destruir cuantas c&eacute;lulas  neopl&aacute;sicas surjan en el organismo (27). Los tumores por tanto ser&iacute;an resultado  de un fallo producido en este mecanismo de vigilancia. Aunque en un inicio  existi&oacute; controversia acerca de este proceso fisiol&oacute;gico de inmunovigilancia, la  posterior identificaci&oacute;n de ant&iacute;genos tumorales en diversos tipos de neoplasias  as&iacute; como el estudio en modelos animales y ulteriores pruebas cl&iacute;nicas demostraron  que el sistema inmune tiene la capacidad de eliminaci&oacute;n de c&aacute;nceres incipientes  (28,29). Aqu&iacute; es importante destacar que los linfocitos T son las c&eacute;lulas por  excelencia en este proceso de reconocimiento y eliminaci&oacute;n de ant&iacute;genos  tumorales.</p>      <p>Sin embargo, existe otro grupo de c&eacute;lulas linfoides  que no reconocen de manera espec&iacute;fica ant&iacute;genos tumorales pero que tienen la  capacidad por igual de identificar y eliminar c&eacute;lulas transformadas. Este grupo  de c&eacute;lulas linfoides es denominado c&eacute;lulas NK (Natural Killer, por sus siglas  en ingl&eacute;s) y su mecanismo se basa en reconocer diversas se&ntilde;ales celulares a  trav&eacute;s de un balance muy fino donde participan una mir&iacute;ada de receptores  inhibidores y activadores que traducen las se&ntilde;ales del microambiente (30,31).  Es a trav&eacute;s de &eacute;stos que las c&eacute;lulas NK pueden identificar a mol&eacute;culas  inducidas durante condiciones de estr&eacute;s celular o de transformaci&oacute;n tumoral  reconociendo a los ligandos MICA/MICB o ULBPs desencadenando sus funciones  citot&oacute;xicas caracter&iacute;sticas. De hecho, la ausencia del receptor NKG2D en  modelos murinos provoca un aumento de la masa tumoral e incremento de la  met&aacute;stasis en carcinomas y leucemias lo que pone en evidencia su importancia en  la inmunovigilancia tumoral (32,33).</p>      <p><b>El receptor NKG2D y su funci&oacute;n como oncoprote&iacute;na</b></p>      <p>Nuestro  grupo de trabajo ha demostrado en dos l&iacute;neas de c&aacute;ncer de c&eacute;rvix humano  denominadas CALO e INBL la expresi&oacute;n del receptor NKG2D lo que constituye el primer  reporte de su presencia en c&eacute;lulas epiteliales tumorales de este receptor  activador que se pensaba exclusivo de c&eacute;lulas linfoides (34). Este hecho, por  si mismo result&oacute; muy interesante de descifrar ya que aunque hab&iacute;a sido descrito  que diversos tipos de tumores expresaban y secretaban los ligandos para este  receptor (MICA/MICB/ULBPs) no se sab&iacute;a que c&eacute;lulas epiteliales pod&iacute;an expresar  de manera simult&aacute;nea el receptor NKG2D exclusivo de linfocitos T y NK. Dado  este fen&oacute;meno y de que se desconoc&iacute;a el efecto biol&oacute;gico de MICA/MICB en las  c&eacute;lulas tumorales mismas supusimos que podr&iacute;an estar relacionadas con su  proliferaci&oacute;n (34).</p>      <p>Efectivamente, se encontr&oacute; una estimulaci&oacute;n importante  de la proliferaci&oacute;n en las l&iacute;neas de c&aacute;ncer cervical y en varias l&iacute;neas de  leucemia humana. La presencia del  receptor NKG2D no es exclusiva de c&eacute;lulas linfoides sino adem&aacute;s est&aacute; presente  en c&eacute;lulas epiteliales tumorales, hecho que puede estar asociado a un aumento  en la tasa de proliferaci&oacute;n de estas c&eacute;lulas tumorales evitando por un lado ser  reconocidas y eliminadas por las c&eacute;lulas efectoras y, por el otro, utilizar  estos receptores activadores para incrementar la masa tumoral, la angiog&eacute;nesis,  extravasaci&oacute;n y su met&aacute;stasis evadiendo por un lado la inmunovigilancia y  utilizando estos elementos como un mecanismo de invasividad y met&aacute;stasis por el  otro (35,36). Asimismo, resultados recientes han permitido corroborar que este  fen&oacute;meno es m&aacute;s generalizado en c&eacute;lulas epiteliales tumorales ya que tambi&eacute;n  hemos detectado la expresi&oacute;n de NKG2D en l&iacute;neas de c&aacute;ncer de mama (resultados  no publicados).</p>      <p>En estudios cl&iacute;nicos recientes, diversos tipos de  tumores expresan de manera importante este receptor incluso se ha vinculado  esta presencia a mal pron&oacute;stico por un incremento de met&aacute;stasis en los  pacientes portadores debido a un aumento de la vascularizaci&oacute;n del tumor  (37,38). Tomando en consideraci&oacute;n lo anteriormente se&ntilde;alado, la expresi&oacute;n del  receptor NKG2D se est&aacute; considerado un blanco importante para inmunoterapia y  podr&iacute;a ser &uacute;til como biomarcador entre otros ya que su presencia est&aacute; asociado  a etapas iniciales de tumorog&eacute;nesis as&iacute; como un incremento de la invasividad y  met&aacute;stasis (39,40), <a href="#f2">Figura 2</a>.</p>      <p align="center"><a name="f2"></a><img src="img/revistas/nova/v12n21/v12n21a03f02.jpg"></p>      ]]></body>
<body><![CDATA[<p><b>PERSPECTIVAS Y CONCLUSIONES</b></p>      <p>La  inmunovigilancia es un mecanismo fisiol&oacute;gico cuya finalidad es proteger al  organismo de la carcinog&eacute;nesis y de varias situaciones externas e internas que  comprometen el status quo. Las c&eacute;lulas del sistema inmune innato y adaptativo  poseen receptores espec&iacute;ficos como NKG2D que reconocen, interpretan y traducen  eventos neopl&aacute;sicos emergentes y diversas infecciones con la finalidad de  eliminar estas amenazas. Sin embargo, las c&eacute;lulas tumorales han desarrollado  estrategias para subvertir este reconocimiento como es el caso del sistema  NKG2D/NKG2DL por el que se valen para utilizarlo a su favor.</p>      <p>La  demostraci&oacute;n del receptor NKG2D en c&eacute;lulas epiteliales tumorales, adem&aacute;s de  linfoides, y su consecuente vinculaci&oacute;n  en el aumento de la masa del tumor y met&aacute;stasis ha abierto la caja de pandora.  Adicionalmente, la identificaci&oacute;n cl&iacute;nica de este receptor activador en varios  tumores hace pensar de su vinculaci&oacute;n m&aacute;s directa en el fen&oacute;meno de  carcinog&eacute;nesis. En contrapartida, tambi&eacute;n abre la posibilidad de utilizar la  presencia de NKG2D para diagn&oacute;stico, progresi&oacute;n y terapia en diversas  condiciones oncol&oacute;gicas.</p>      <p><b>AGRADECIMIENTOS</b></p>      <p>Se agradece los recursos  financieros otorgados por el PAPIIT de la Universidad Nacional Aut&oacute;noma de  M&eacute;xico (Proyecto: IN217213). La participaci&oacute;n de Itzel Moreno Mart&iacute;nez e Iv&aacute;n  Zerme&ntilde;o Rangel en el dise&ntilde;o de las im&aacute;genes.</p>  <hr>     <p><b>REFERENCIAS</b></p>      <!-- ref --><p>1.  Yokoyama WM, Plougastel BF. Immune functions  encoded by the natural killer gene complex. Nat Rev Immunol. 2003; 3:304-316.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000039&pid=S1794-2470201400010000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>2. Yokoyama WM,  Seaman WE. The Ly-49 and NKRP1 gene families encoding lectin-like receptors on  natural killer cells: the NK gene complex. Annu Rev Immunol. 1993; 11:613-635.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000041&pid=S1794-2470201400010000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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