<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932011000400007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Linfoma cutáneo de células T Revisión del tema con énfasis en la inmunopatogénesis]]></article-title>
<article-title xml:lang="en"><![CDATA[Cutaneous T-cell lymphoma: Review with emphasis on immunophatogenesis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque Giraldo]]></surname>
<given-names><![CDATA[Victoria Eugenia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez Lopera]]></surname>
<given-names><![CDATA[Margarita María]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Grupo de Investigación Dermatológica]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>24</volume>
<numero>4</numero>
<fpage>402</fpage>
<lpage>414</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932011000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932011000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932011000400007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Bajo el término linfoma cutáneo de células T (LCCT) se agrupa una serie de enfermedades que tienen en común la presencia de un clon maligno de células T y la afectación de la piel. La micosis fungoide (MF) es la forma más común de LCCT, seguida por el síndrome de Sèzary (SS). La causa definitiva de la MF es desconocida. El inmunofenotipo de la mayoría de los casos de MF es de células T de memoria CD3+CD4+CD45RO+CLA+CD8-. Los linfocitos T CD4+ malignos migran hasta la epidermis y se localizan alrededor de las células de Langerhans (LC). En el SS las células pierden el epidermotropismo e infiltran extensamente la dermis, la sangre y otros tejidos; estas células presentan un inmunofenotipo predominante de células T neoplásicas CD3+CD4+CD8-CD7-CD26- CD158k+CD94-. El perfil Th2 y la supresión de respuestas Th1 son dos factores críticos en la progresión de la enfermedad. Se han evaluado muy poco las alteraciones en la regulación inmune en el LCCT. Un mejor entendimiento de la función de las células T y de la inmunobiología de los LCCT permitiría mejorar el pronóstico, el tratamiento y el seguimiento de los pacientes con estas neoplasias.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The term cutaneous T-cell lymphoma (CTCL) refers to several diseases that have in common the presence of a malignant T-cell clone with involvement of the skin. Mycosis fungoides (MF) is the most common form of CTCL, followed by the Sèzary syndrome (SS). The cause of mycosis fungoides is unknown. Immunophenotype of most cases of MF is made up by memory T cells CD3+CD4+CD45RO+CLA+CD8-. Malignant T CD4+ lymphocytes migrate to the epidermis and localize around Langerhans cells. In SS, cells loose their epidermotropism and extensively infiltrate the dermis, blood and other tissues. These cells present a predominant immunophenotype of neoplasic T cells CD3+CD4+CD8-CD7-CD26-CD158k+CD94-. The Th2 profile and the supression of Th1 responses are two critical factors in the progression of the disease. Alterations in the immune regulation in CTCL have not been thoroughly evaluated. A better understanding of T-cell function and of the immunobiology of CTCL would allow to improve the prognosis, therapy and follow-up of patients with these neoplasias.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Células T reguladoras]]></kwd>
<kwd lng="es"><![CDATA[Linfoma de células T]]></kwd>
<kwd lng="es"><![CDATA[Micosis Fungoide]]></kwd>
<kwd lng="es"><![CDATA[Síndrome de Sèzary]]></kwd>
<kwd lng="en"><![CDATA[Mycosis Fungoides]]></kwd>
<kwd lng="en"><![CDATA[Regulatory T-Cells]]></kwd>
<kwd lng="en"><![CDATA[Sèzary Syndrome]]></kwd>
<kwd lng="en"><![CDATA[T-Cell Lymphoma]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b> Linfoma cut&aacute;neo de c&eacute;lulas T   Revisi&oacute;n del tema con &eacute;nfasis en la inmunopatog&eacute;nesis</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Cutaneous T-cell lymphoma: Review with emphasis on immunophatogenesis</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">   <b>Victoria Eugenia Duque Giraldo<sup>1</sup>; Margarita Mar&iacute;a Vel&aacute;squez Lopera<sup>2</sup></b> </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1 Mag&iacute;ster en Ciencias B&aacute;sicas Biom&eacute;dicas-Inmunolog&iacute;a, Universidad de Antioquia, Medell&iacute;n, Colombia.</font> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="mailto:vickyduque@gmail.com">vickyduque@gmail.com</a></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 2 Dermat&oacute;loga, Doctora en Ciencias B&aacute;sicas Biom&eacute;dicas-Inmunolog&iacute;a. Profesora y Jefa de la Secci&oacute;n de Dermatolog&iacute;a, Grupo de Investigaci&oacute;n Dermatol&oacute;gica GRID, Facultad de   Medicina, Universidad de Antioquia, Medell&iacute;n, Colombia. </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Recibido: agosto 20 de 2010    <br>   Aceptado: julio 18 de 2011</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Bajo el t&eacute;rmino linfoma cut&aacute;neo de c&eacute;lulas T &#40;LCCT&#41; se agrupa una serie de enfermedades que   tienen en com&uacute;n la presencia de un clon maligno de c&eacute;lulas T y la afectaci&oacute;n de la piel. La micosis   fungoide &#40;MF&#41; es la forma m&aacute;s com&uacute;n de LCCT, seguida por el s&iacute;ndrome de S&egrave;zary &#40;SS&#41;. La causa   definitiva de la MF es desconocida. El inmunofenotipo de la mayor&iacute;a de los casos de MF es de   c&eacute;lulas T de memoria CD3<sup>&#43;</sup>CD4<sup>&#43;</sup>CD45RO<sup>&#43;</sup>CLA<sup>&#43;</sup>CD8<sup>-</sup>. Los linfocitos T CD4<sup>&#43;</sup> malignos migran hasta   la epidermis y se localizan alrededor de las c&eacute;lulas de Langerhans &#40;LC&#41;. En el SS las c&eacute;lulas pierden   el epidermotropismo e infiltran extensamente la dermis, la sangre y otros tejidos; estas c&eacute;lulas   presentan un inmunofenotipo predominante de c&eacute;lulas T neopl&aacute;sicas CD3<sup>&#43;</sup>CD4<sup>&#43;</sup>CD8<sup>-</sup>CD7<sup>-</sup>CD26<sup>-</sup> CD158k<sup>&#43;</sup>CD94<sup>-</sup>. El perfil Th2 y la supresi&oacute;n de respuestas Th1 son dos factores cr&iacute;ticos en la progresi&oacute;n   de la enfermedad. Se han evaluado muy poco las alteraciones en la regulaci&oacute;n inmune en el LCCT.   Un mejor entendimiento de la funci&oacute;n de las c&eacute;lulas T y de la inmunobiolog&iacute;a de los LCCT permitir&iacute;a   mejorar el pron&oacute;stico, el tratamiento y el seguimiento de los pacientes con estas neoplasias.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>PALABRAS CLAVE</b>   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>C&eacute;lulas T reguladoras, Linfoma de c&eacute;lulas T, Micosis Fungoide, S&iacute;ndrome de S&egrave;zary</i></font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">The term cutaneous T-cell lymphoma &#40;CTCL&#41; refers to several diseases that have in common   the presence of a malignant T-cell clone with involvement of the skin. Mycosis fungoides   &#40;MF&#41; is the most common form of CTCL, followed by the S&egrave;zary syndrome &#40;SS&#41;. The cause   of mycosis fungoides is unknown. Immunophenotype of most cases of MF is made up by   memory T cells CD3<sup>&#43;</sup>CD4<sup>&#43;</sup>CD45RO<sup>&#43;</sup>CLA<sup>&#43;</sup>CD8<sup>-</sup>. Malignant T CD4<sup>&#43;</sup> lymphocytes migrate to the   epidermis and localize around Langerhans cells. In SS, cells loose their epidermotropism and   extensively infiltrate the dermis, blood and other tissues. These cells present a predominant   immunophenotype of neoplasic T cells CD3<sup>&#43;</sup>CD4<sup>&#43;</sup>CD8<sup>-</sup>CD7<sup>-</sup>CD26<sup>-</sup>CD158k<sup>&#43;</sup>CD94<sup>-</sup>. The Th2 profile and the supression of Th1 responses are   two critical factors in the progression of the disease.   Alterations in the immune regulation in CTCL have not   been thoroughly evaluated. A better understanding of   T-cell function and of the immunobiology of CTCL   would allow to improve the prognosis, therapy and   follow-up of patients with these neoplasias.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>KEY WORDS</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Mycosis Fungoides, Regulatory T-Cells, S&egrave;zary Syndrome,</i> T-Cell Lymphoma</font></p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"> <b>INTRODUCCI&Oacute;N</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se ha utilizado el t&eacute;rmino <i>linfoma cut&aacute;neo de c&eacute;lulas   T </i>&#40;LCCT&#41; para agrupar una serie de enfermedades que   tienen en com&uacute;n la presencia de un clon maligno   de c&eacute;lulas T en piel, las cuales var&iacute;an en cuanto a su   histolog&iacute;a, inmunofenotipo y pron&oacute;stico. La micosis   fungoide &#40;MF&#41; es la forma m&aacute;s com&uacute;n y m&aacute;s estudiada   de LCCT, seguida por el s&iacute;ndrome de S&egrave;zary &#40;SS&#41;. Entre   otras formas menos frecuentes de LCCT se pueden   citar: el linfoma/leucemia de c&eacute;lulas T del adulto,   los trastornos linfoproliferativos CD30<sup>&#43;</sup> y el linfoma   extranodal de c&eacute;lulas NK/T &#40;<a href="#t1">tabla 1</a>&#41; &#40;1&#41;. Esta revisi&oacute;n se   centra en la inmunopatog&eacute;nesis de la MF y el SS.</font></p>     <p align="center"><a name="t1"></a><img src="img/revistas/iat/v24n4/v24n4a7t1.jpg"></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La MF representa el 1&#37; de todos los linfomas no   Hodgkin extraganglionares y m&aacute;s del 50&#37; de todos   los LCCT; afecta principalmente a adultos mayores   de 50 a&ntilde;os, con predominio en hombres &#40;relaci&oacute;n   hombre/mujer: 2/1&#41;, aunque tambi&eacute;n se han descrito   casos en ni&ntilde;os y adolescentes, posiblemente por el   mejoramiento en las t&eacute;cnicas diagn&oacute;sticas empleadas   &#40;2&#41;. La enfermedad tiene un curso cl&iacute;nico con progresi&oacute;n lenta que puede durar a&ntilde;os e incluso d&eacute;cadas antes del diagn&oacute;stico. Cl&aacute;sicamente la MF comienza   con el estadio de parches, caracterizado por presentar una o varias zonas de eczema y descamaci&oacute;n fina,   localizadas en &aacute;reas no expuestas a la luz, que pueden ser recurrentes y desaparecer espont&aacute;neamente sin dejar cicatriz; cl&iacute;nicamente se puede confundir con   las lesiones producidas por otras enfermedades como el vitiligo, lo cual dificulta su diagn&oacute;stico &#40;<a href="img/revistas/iat/v24n4/v24n4a7f1.jpg" target="_blank">figuras 1A   y 1B</a>&#41;. Luego de un per&iacute;odo de varios meses o a&ntilde;os la MF evoluciona al estadio de placas, que son bien   definidas, induradas, de color viol&aacute;ceo e intensamente   pruriginosas &#40;<a href="img/revistas/iat/v24n4/v24n4a7f1.jpg" target="_blank">figura 1C</a>&#41;. En el estadio tumoral aparecen en toda la superficie corporal n&oacute;dulos rojos y viol&aacute;ceos, de superficie lisa, con mayor frecuencia en la cara y los pliegues inguinal, antecubital, axilar e inframamario.   Los tumores aparecen sobre placas antiguas de MF o en zonas de piel no afectadas previamente por la enfermedad. Su crecimiento es progresivo y pueden ulcerarse r&aacute;pidamente &#40;<a href="img/revistas/iat/v24n4/v24n4a7f1.jpg" target="_blank">figura 1D</a>&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El estadio de eritrodermia &#40;s&iacute;ndrome de S&egrave;zary, variante leuc&eacute;mica del LCCT&#41; puede aparecer en la evoluci&oacute;n de una MF o de <i>novo</i> en el 5&#37; de los casos. Las c&eacute;lulas pierden el epidermotropismo e infiltran extensamente la dermis. La afectaci&oacute;n hematol&oacute;gica se caracteriza por la presencia de m&aacute;s del 5&#37; &#40;1.000 c&eacute;lulas/&#181;L&#41; de mononucleares at&iacute;picos &#40;c&eacute;lulas de S&egrave;zary&#41; en la circulaci&oacute;n. La afectaci&oacute;n de la piel es amplia, con prurito intenso y descamaci&oacute;n generalizada; en los estadios   avanzados de la enfermedad, las c&eacute;lulas, adem&aacute;s de   infiltrar la piel, invaden los ganglios, el bazo, el h&iacute;gado   y la m&eacute;dula &oacute;sea. Las c&eacute;lulas de S&egrave;zary son de origen extramedular, de gran tama&ntilde;o, con escaso citoplasma y n&uacute;cleo grande cerebriforme &#40;1&#41;. La gravedad de la MF se clasifica en cuatro estadios &#40;I-IV&#41; de acuerdo con su extensi&oacute;n en la piel, ganglios, sangre y v&iacute;sceras: estadio leve &#40;IA-IIA&#41; y estadio grave &#40;IIB-IVB&#41; &#40;3,4&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Factores involucrados en el desarrollo de MF/SS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> An&aacute;lisis por reacci&oacute;n en cadena de polimerasa   &#40;PCR&#41; de los rearreglos del gen de las cadenas Vb del   receptor del linfocito T &#40;TCR, por la sigla en ingl&eacute;s de <i>T cell receptor</i>&#41; han permitido la detecci&oacute;n de c&eacute;lulas   malignas en muestras de sangre perif&eacute;rica de pacientes en los estadios tempranos de la enfermedad con bajo   n&uacute;mero de parches o placas en la piel, lo cual sugiere que las c&eacute;lulas del clon maligno recirculan y pueden afectar sitios distantes, por lo que la enfermedad, aun   en sus etapas iniciales, no se considera localizada a un solo segmento cut&aacute;neo &#40;5&#41;. Hasta el momento no ha sido   posible determinar si la transformaci&oacute;n maligna de los   linfocitos ocurre en la sangre perif&eacute;rica o directamente en el tejido; se sabe que en la sangre perif&eacute;rica el clon de linfocitos T de memoria CD4<sup>&#43;</sup>CD45RO<sup>&#43;</sup> expresa en su superficie mol&eacute;culas de adherencia como el ant&iacute;geno leucocitario cut&aacute;neo &#40;CLA, por la sigla en ingl&eacute;s de <i>cutaneous lymphocyte antigen</i>&#41; y CCR4 &#40;por   la sigla en ingl&eacute;s de <i>C-C chemokyne receptor type 4</i>&#41;,   que interaccionan con la E-selectina y con el ligando   17 de quimiocinas &#40;CCL17, por la sigla en ingl&eacute;s de <i>chemokyne &#91;C-C motif&#93; ligand 17&#41;</i> en las v&eacute;nulas   poscapilares de la dermis, respectivamente. La uni&oacute;n de estas mol&eacute;culas permite la entrada de linfocitos T   a la dermis y la epidermis, en donde interaccionan   con las c&eacute;lulas de Langerhans &#40;LC, por la sigla en   ingl&eacute;s de <i>Langerhans cells</i>&#41; que proveen los est&iacute;mulos   necesarios para inducir la expansi&oacute;n clonal de los   linfocitos malignos &#40;6,7&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> A&uacute;n se desconoce el agente etiol&oacute;gico de la MF   pero se han propuesto los siguientes: la persistencia   antig&eacute;nica, las infecciones virales, la exposici&oacute;n   ocupacional a carcin&oacute;genos como pesticidas, los   productos empleados en las industrias del papel y el   vidrio, el licor y el cigarrillo y alteraciones gen&eacute;ticas.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La proliferaci&oacute;n de las c&eacute;lulas malignas alrededor de   las c&eacute;lulas de Langerhans epid&eacute;rmicas, que conforma   los microabscesos de Pautrier, sugiere que la   generaci&oacute;n del tumor podr&iacute;a deberse a la presentaci&oacute;n   antig&eacute;nica constante de ant&iacute;genos espec&iacute;ficos a&uacute;n no   identificados &#40;5,7&#41;. Se ha debatido ampliamente el   papel del <i>virus linfotr&oacute;pico humano tipo 1</i> &#40;HTLV-1&#41;   en el desarrollo y progresi&oacute;n del LCCT. Algunas de las   evidencias m&aacute;s importantes de asociaci&oacute;n entre MF   y HTLV-1 han sido la presencia de ADN de HTLV-1 en   c&eacute;lulas mononucleares de sangre perif&eacute;rica &#40;CMSP&#41; y   en lesiones de piel de algunos pacientes con MF en   Dinamarca &#40;8-10&#41;. Por el contrario, estudios llevados   a cabo en muestras de suero y biopsias de piel de   pacientes en diferentes pa&iacute;ses como Dinamarca,   Polonia e Ir&aacute;n no encontraron asociaci&oacute;n entre   LCCT y esta infecci&oacute;n viral &#40;11-13&#41;. De acuerdo con   estas evidencias, no es posible concluir si hay o no   relaci&oacute;n entre las infecciones por HTLV-1 y el LCCT.   Puede ser que el papel etiol&oacute;gico del HTLV-1 var&iacute;e en   las diferentes poblaciones estudiadas.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se ha asociado la infecci&oacute;n por citomegalovirus   &#40;CMV&#41; con el LCCT. La infecci&oacute;n activa por CMV tiene   efectos directos sobre la expansi&oacute;n y activaci&oacute;n de   las poblaciones de c&eacute;lulas CD8<sup>&#43;</sup> y NK lo que puede   contribuir al desarrollo de la enfermedad tumoral. El   CMV inhibe la expresi&oacute;n de las mol&eacute;culas del complejo   mayor de histocompatibilidad clase I &#40;MHC-I&#41; en   las c&eacute;lulas infectadas y disminuye la producci&oacute;n de   IFN-&gamma; por los macr&oacute;fagos. Herne y colaboradores &#40;14&#41;   hallaron que el 97&#37; de los 116 individuos con LCCT   participantes en su estudio ten&iacute;an t&iacute;tulos m&aacute;s altos de   IgG para CMV que los controles sanos. Estos hallazgos   les permitieron concluir que la infecci&oacute;n latente por   CMV podr&iacute;a tener un papel en la patog&eacute;nesis del LCCT   probablemente por mecanismos de presentaci&oacute;n   antig&eacute;nica cr&oacute;nica que induce la proliferaci&oacute;n de las   c&eacute;lulas T y hace disminuir la apoptosis de las c&eacute;lulas T   del clon maligno &#40;15&#41;   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Poco se sabe del papel de la infecci&oacute;n por el virus de   Epstein-Barr &#40;EBV&#41; en el desarrollo de la MF. Sin embargo,   se propone que dicha infecci&oacute;n podr&iacute;a contribuir a la   patog&eacute;nesis de la enfermedad por la generaci&oacute;n de un   ambiente inmunosupresor que permitir&iacute;a a las c&eacute;lulas   tumorales escapar de la respuesta inmunol&oacute;gica &#40;16-19&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se ha relacionado a algunas alteraciones gen&eacute;ticas   como deleciones &#40;1p, 17p, 10q&#41;, adiciones &#40;4q, 18y   17q&#41; y translocaciones, adem&aacute;s de inestabilidad en   microsat&eacute;lites, con el desarrollo y la progresi&oacute;n de la   enfermedad &#40;20,21&#41;. Estos fen&oacute;menos contribuyen a la   presencia de mutaciones en distintos genes: supresores   de tumores, reguladores del ciclo celular, implicados   en la expansi&oacute;n clonal y en la evasi&oacute;n de la respuesta   inmune como p53, p15, p16, Jun B, y PTEN &#40;por la sigla   en ingl&eacute;s de <i>phosphatase and tensin homologue</i>&#41;. Las   alteraciones en estos genes aparecen tard&iacute;amente en   el curso del LCCT lo cual sugiere que se presentan a   consecuencia de los cambios inmunol&oacute;gicos y no   como causa del linfoma &#40;1,22&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se cree que el desarrollo de la enfermedad podr&iacute;a tener   una base gen&eacute;tica: en 1933 Cameron y colaboradores   &#40;23&#41; reportaron el caso de una mujer de 45 a&ntilde;os y   su hija de 28 a&ntilde;os con MF eritrod&eacute;rmica. Hodak y   colaboradores reportaron la asociaci&oacute;n de la presencia   de HLA DRB1&#42;11 y DQB&#42;03 con el desarrollo de MF en   seis familias en Israel, lo que confirma el posible papel   del HLA en la susceptibilidad a la enfermedad &#40;24&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Inmunopatog&eacute;nesis de la MF/SS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Histol&oacute;gicamente, las lesiones de MF se caracterizan   por la infiltraci&oacute;n de numerosos linfocitos T tanto en la   dermis como en la epidermis &#40;<a href="img/revistas/iat/v24n4/v24n4a7f2.jpg" target="_blank">figura 2A</a>&#41;, con especial   tropismo por los fol&iacute;culos y las gl&aacute;ndulas sudor&iacute;paras,   o linfocitos solitarios alineados en la membrana   basal &#40;uno a cinco linfocitos por campo, 20X&#41; &#40;25&#41;, y   por la aparici&oacute;n de los microabscesos de Pautrier   caracterizados por linfocitos T CD4<sup>&#43;</sup> alrededor de una   c&eacute;lula de Langerhans &#40;<a href="img/revistas/iat/v24n4/v24n4a7f2.jpg" target="_blank">figura 2B</a>&#41; &#40;26&#41;. El inmunofenotipo   de la mayor&iacute;a de las MF corresponde a c&eacute;lulas T de   memoria CD3<sup>&#43;</sup>CD4<sup>&#43;</sup>CD45RO<sup>&#43;</sup>CLA<sup>&#43;</sup>CD25<sup>&#43;</sup>CD8<sup>-</sup>, que   pierden la expresi&oacute;n de ant&iacute;genos como CD2, CD3, CD5 y CD7 y expresan prote&iacute;nas citot&oacute;xicas como TIA-1 y granzima B &#40;27&#41;. Por su parte, las c&eacute;lulas de S&egrave;zary presentan un inmunofenotipo variable &#40;expresi&oacute;n diferencial de los marcadores de superficie&#41;, lo que dificulta su identificaci&oacute;n, CD3<sup>-</sup>CD4<sup>&#43;</sup>CD8<sup>-</sup>CD7<sup>-</sup>CD26<sup>-</sup> CD158k<sup>&#43;</sup>CD94<sup>-</sup>; la expresi&oacute;n diferencial de estos   marcadores les confiere la capacidad de evadir la   respuesta antitumoral &#40;5,28&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Entre los mecanismos que controlan la migraci&oacute;n y el posicionamiento de las c&eacute;lulas T en la piel est&aacute;n las   quimiocinas producidas por los queratinocitos, tales como CCL7, CCL27 y CCL4, y la expresi&oacute;n de receptores para las mismas como CCR4, CXCR4, CCR10 y el ant&iacute;geno leucocitario cut&aacute;neo &#40;CLA&#41; &#40;6,7,29&#41;. Adem&aacute;s, las quimiocinas tienen la capacidad de incrementar la afinidad y avidez de uni&oacute;n entre las integrinas de los linfocitos &#40;b1 y b2&#41; y sus receptores endoteliales como la mol&eacute;cula 1 de adherencia intercelular &#40;ICAM-1, por la sigla en ingl&eacute;s de <i>intercellular adhesion molecule-1</i>&#41; permitiendo su activaci&oacute;n y dando lugar a la formaci&oacute;n   de los microabcesos de Pautrier, marca histol&oacute;gica de la enfermedad &#40;7&#41;. Estudios comparativos de la expresi&oacute;n de receptores de quimiocinas en cada estadio de la MF encontraron que los niveles de expresi&oacute;n de CCR4 y CXCR3 se encontraban disminuidos en el estadio tumoral y que los de CCR7, receptor asociado con el tr&aacute;fico de linfocitos a los ganglios linf&aacute;ticos,   se encontraban aumentados &#40;7,27,30&#41;. La expresi&oacute;n diferencial de estos receptores de superficie se considera de gran importancia en la diseminaci&oacute;n   de la enfermedad y en la capacidad de invasi&oacute;n de   diferentes &oacute;rganos y tejidos por el clon maligno.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Algunas evidencias apuntan a que las interacciones   entre el clon maligno y las c&eacute;lulas presentadoras de ant&iacute;geno &#40;APC, por la sigla en ingl&eacute;s de <i>antigenpresenting     cells</i>&#41; pueden variar en diferentes estadios de la enfermedad y en los distintos modelos estudiados.   Berger y colaboradores &#40;31&#41; en estudios <i>in vitro</i> reportan que el clon maligno podr&iacute;a contribuir al mantenimiento   y la supervivencia de las c&eacute;lulas dendr&iacute;ticas inmaduras por mecanismos que incluyen la coestimulaci&oacute;n   mediante CD40/CD40L. A diferencia de esto, en estadios avanzados de la enfermedad, las c&eacute;lulas T disminuyen la   expresi&oacute;n de CD40L lo que contribuye a las deficiencias en la presentaci&oacute;n antig&eacute;nica y a la inmunosupresi&oacute;n asociada a la MF/SS &#40;31,32&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A&uacute;n no est&aacute; dilucidado el efecto de las citocinas producidas en el microambiente tumoral sobre la progresi&oacute;n de la enfermedad. Se sabe que en los estadios iniciales de la MF es muy baja la proporci&oacute;n de c&eacute;lulas tumorales que producen citocinas como IL-4 e IL-5 en el infiltrado cut&aacute;neo, mientras que es muy alto el porcentaje de c&eacute;lulas T CD8<sup>&#43;</sup> productoras de citocinas como IFN-&gamma;   e IL-2, lo que induce una respuesta principalmente Th1. A medida que avanza la enfermedad, se evidencia   un aumento en la producci&oacute;n de citocinas Th2 como IL-4, IL-5 y de citocinas inmunorreguladoras como IL-10   producidas por las c&eacute;lulas T malignas que suprimen las   respuestas Th1 y representan un mecanismo de evasi&oacute;n   de la respuesta antitumoral &#40;33&#41;. En este mismo sentido,   el incremento en el mARN de IL-10 y la disminuci&oacute;n del   mARN de IFN-&gamma; se han asociado con el aumento en la   densidad del clon maligno en la piel a medida que la   enfermedad progresa de lesiones tipo parche o placa a   tumor &#40;<a href="img/revistas/iat/v24n4/v24n4a7f3.jpg" target="_blank">figura 3</a>&#41; &#40;30,34-37&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Vowels y colaboradores &#40;35&#41; demostraron que biopsias   de piel obtenidas de pacientes con SS presentaban   niveles altos de mARN para IL-4 e IL-5 producidas   por el clon maligno, cuando se las comparaba con   muestras de piel obtenidas de zonas no afectadas y   de controles sanos. De igual forma, estos autores   demostraron que c&eacute;lulas mononucleares de sangre   perif&eacute;rica de pacientes con SS produc&iacute;an m&aacute;s IL-4 y   menos IL-2 e IFN-&gamma;, que controles sanos &#40;<a href="img/revistas/iat/v24n4/v24n4a7f3.jpg" target="_blank">figura 3</a>&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Wysocka y colaboradores &#40;38&#41; observaron una   disminuci&oacute;n progresiva, a medida que aumentaba   el recuento de c&eacute;lulas malignas circulantes, en la   producci&oacute;n de citocinas como IL-2, IL-4, IL-12, IL-13,   IL-15, IL-18 e IFN-&gamma; en c&eacute;lulas mononucleares de sangre   perif&eacute;rica de pacientes con SS. Tal disminuci&oacute;n estaba   relacionada con la merma de c&eacute;lulas dendr&iacute;ticas   mieloides y plasmocitoides en estos pacientes. En   biopsias de piel de pacientes con LCCT se ha visto   sobrexpresi&oacute;n de IL-15, citocina relacionada con la   inhibici&oacute;n de la apoptosis de c&eacute;lulas T despu&eacute;s de   exposici&oacute;n al ant&iacute;geno y de promover la expansi&oacute;n   y persistencia de las c&eacute;lulas T CD4 &#40;<a href="img/revistas/iat/v24n4/v24n4a7f3.jpg" target="_blank">figura 3</a>&#41; &#40;27,39&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Posible papel de las c&eacute;lulas T reguladores y Th17   en el desarrollo y progresi&oacute;n del LCCT</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El conocimiento de las subpoblaciones de c&eacute;lulas   reguladoras ha definido una nueva etapa en el   desarrollo investigativo sobre la generaci&oacute;n y el control   de la respuesta inmune. Hasta el momento se han   caracterizado dos poblaciones de c&eacute;lulas T reguladoras   CD4<sup>&#43;</sup> &#40;Treg&#41;; una es la de c&eacute;lulas reguladoras naturales   o t&iacute;micas CD4<sup>&#43;</sup>CD25<sup>high</sup>FOXP3<sup>&#43;</sup>CTLA-4<sup>high</sup>CD127<sup>-/</sup>   <sup>low</sup>GITR<sup>&#43;</sup>, cuya funci&oacute;n es determinada en el timo, y   otra es la de c&eacute;lulas Treg adaptativas o inducidas, que   adquieren su funci&oacute;n reguladora en la periferia &#40;40&#41;. En   las Treg adaptativas se incluyen las Tr1 &#40;CD4<sup>&#43;</sup>IL-10<sup>&#43;</sup>&#41;,   las Th3 &#40;CD4<sup>&#43;</sup>TGF-b<sup>&#43;</sup>&#41; y las de fenotipo similar a las   naturales CD4<sup>&#43;</sup>CD25<sup>high</sup>FOXP3<sup>&#43;</sup>; estas se diferencian   en la periferia a partir de c&eacute;lulas T CD4<sup>&#43;</sup>CD25- por   mecanismos que incluyen la presentaci&oacute;n antig&eacute;nica   en presencia de IL-10 y TGF-b producidos por las DC   o por otras c&eacute;lulas reguladoras &#40;40&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Algunos autores han propuesto que el LCCT podr&iacute;a   ser una neoplasia de c&eacute;lulas T reguladoras. Berger   y colaboradores &#40;41&#41; demostraron que cuando se   cultivaban c&eacute;lulas malignas CD4<sup>&#43;</sup> con DC que hab&iacute;an   sido pulsadas con c&eacute;lulas tumorales apopt&oacute;ticas,   adquir&iacute;an el fenotipo y la funci&oacute;n de c&eacute;lulas T   reguladoras, caracterizados por la alta expresi&oacute;n   de mol&eacute;culas como CD25, CTLA-4 y FOXP3, y por la   producci&oacute;n de citocinas inmunorreguladoras como   IL-10 y TGF-b. Otra evidencia en este sentido es la   presencia de concentraciones m&aacute;s altas de IL-10 en la   sangre perif&eacute;rica de pacientes con LCCT, lo que sugiere   que esta citocina podr&iacute;a favorecer la generaci&oacute;n de   c&eacute;lulas Treg adaptativas. A su vez, las c&eacute;lulas reguladoras   adaptativas Tr1, productoras de cantidades altas de   IL-10, podr&iacute;an favorecer mecanismos de escape de la   respuesta antitumoral &#40;42&#41;. Sin embargo, se requiere   mayor evidencia experimental a este respecto.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En general, se ha evaluado poco la regulaci&oacute;n inmune   en el LCCT. Entre las evidencias reportadas, Tiemessen   y colaboradores &#40;43&#41; sugirieron que la disfunci&oacute;n   observada en las Treg de algunos pacientes con LCCT   podr&iacute;a estar correlacionada con la progresi&oacute;n del   tumor; estos resultados se obtuvieron en un grupo de   diez pacientes con SS, en los que se observ&oacute; que el   porcentaje de c&eacute;lulas T CD4<sup>&#43;</sup>CD25<sup>&#43;</sup> era similar entre   pacientes y controles sanos; sin embargo, en su estudio   observaron que cuatro de los pacientes ten&iacute;an disminuida   la expresi&oacute;n de FOXP3 y la funci&oacute;n reguladora. Otros   autores han planteado que las c&eacute;lulas Treg naturales y   adaptativas podr&iacute;an impedir la generaci&oacute;n y activaci&oacute;n   de c&eacute;lulas antitumorales en el LCCT e incrementar las   alteraciones en las poblaciones de c&eacute;lulas CD8<sup>&#43;</sup> &#40;44&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En un estudio realizado por Klemke y colaboradores   &#40;45&#41; se encontr&oacute; que las c&eacute;lulas malignas no   presentaban un fenotipo regulador, por lo que   concluyeron que las c&eacute;lulas Treg no son las   responsables del desarrollo de la enfermedad. En   este mismo estudio informaron la disminuci&oacute;n de   la poblaci&oacute;n de c&eacute;lulas Treg en pacientes con SS y   concluyeron que posiblemente estas c&eacute;lulas tengan   un papel importante en la gravedad de este s&iacute;ndrome   comparado con otros tipos de LCCT. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s, estudios de inmunohistoqu&iacute;mica en biopsias   de pacientes con LCCT han permitido evidenciar   la presencia de c&eacute;lulas FOXP3<sup>&#43;</sup> infiltrantes en la   dermis y la epidermis. Sin embargo, no se ha podido   demostrar que sean las c&eacute;lulas del clon maligno las   que est&aacute;n expresando dicho factor; posiblemente   el microambiente tumoral permita la inducci&oacute;n   del fenotipo regulador, exacerbando el fenotipo de   inmunosupresi&oacute;n observado en los pacientes y la   evasi&oacute;n de la respuesta antitumoral &#40;45,46&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recientemente se identific&oacute; tanto en ratones como   en humanos un nuevo fenotipo de c&eacute;lulas CD4<sup>&#43;</sup>, las   Th17. Estas c&eacute;lulas se caracterizan por la producci&oacute;n   de citocinas como IL17A, IL17F, IL-21, IL-22, IL-26   y CCL20 &#40;en humanos&#41;. Existen evidencias tanto   en ratones como en humanos indicadoras de que   las c&eacute;lulas Th17 est&aacute;n involucradas en procesos   inflamatorios y en el desarrollo de autoinmunidad,   pero a&uacute;n se desconoce su papel exacto en la   inmunidad tumoral &#40;47,48&#41;. La IL-17 es una citocina   proinflamatoria que se encuentra asociada con el   est&iacute;mulo de la producci&oacute;n de otras citocinas como   IL-6, IL-1 &beta;, TNF-&alpha; e IFN-&gamma;; tambi&eacute;n con el incremento   en la expresi&oacute;n de CD40, citocinas quimiot&aacute;cticas   como IL-8, factores de crecimiento hematopoy&eacute;tico   como los factores estimulantes de colonias de   granulocitos &#40;G-GSF&#41; y de granulocitos-macr&oacute;fagos   &#40;GM-CSF&#41;, los cuales promueven el crecimiento y la   maduraci&oacute;n de las c&eacute;lulas mieloides reclutadas a los   sitios de inflamaci&oacute;n. Adem&aacute;s de lo anterior, IL-17 es   un puente entre la inmunidad innata y la adaptativa   al inducir la expresi&oacute;n de mol&eacute;culas como ICAM-1   incrementando la activaci&oacute;n de las c&eacute;lulas T &#40;49&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En a&ntilde;os recientes se ha tratado de dilucidar la posible   relaci&oacute;n entre las c&eacute;lulas Treg y Th17. En humanos   existen reportes en los que se muestra que las c&eacute;lulas   Treg no son capaces de suprimir la proliferaci&oacute;n de   las c&eacute;lulas Th17 &#40;50-51&#41;. De hecho, se ha demostrado   que las Treg tienen la capacidad de inducir la   diferenciaci&oacute;n de c&eacute;lulas CD4<sup>&#43;</sup> de memoria a c&eacute;lulas   Th17 &#40;50&#41;, inclusive algunas c&eacute;lulas Treg son capaces   de producir grandes cantidades de IL-17 y de expresar   simult&aacute;neamente los factores de transcripci&oacute;n   FOXP3 y RORC, que se consideran los espec&iacute;ficos   de las c&eacute;lulas Treg y Th17, respectivamente &#40;52,53&#41;.   Mangan y colaboradores &#40;54&#41; demostraron que la   adici&oacute;n de TGF-b a c&eacute;lulas T CD4<sup>&#43;</sup> v&iacute;rgenes induce   la diferenciaci&oacute;n a Th17, efecto que aumenta con la   adici&oacute;n de anticuerpos neutralizantes anti-IFN-g y anti-   IL-4. En otros experimentos, estos autores demostraron   que la adici&oacute;n de IL-6 a los cultivos induce la merma   de la expresi&oacute;n de FOXP3, mientras que el bloqueo de   IL-6 estimula la generaci&oacute;n de c&eacute;lulas T reguladoras. La   interrelaci&oacute;n entre las c&eacute;lulas Treg y Th17 se considera   importante para el mantenimiento del balance entre   una respuesta inmune eficiente y el da&ntilde;o patol&oacute;gico.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Estudios cl&iacute;nicos y experimentos en modelos animales   han sugerido el papel de las c&eacute;lulas Th17 y las citocinas   asociadas con la respuesta Th17 en el desarrollo de   tumores como melanomas &#40;55&#41;, c&aacute;ncer de ovario &#40;56&#41;,   c&aacute;ncer de mama &#40;57&#41;, c&aacute;ncer de pulm&oacute;n &#40;58&#41;, entre   otros, pero hasta el momento no est&aacute; claro si estas   c&eacute;lulas est&aacute;n implicadas en el progreso o inhibici&oacute;n   del tumor.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se plantea la posibilidad que entre las alteraciones   en la regulaci&oacute;n inmune en LCCT participen las   c&eacute;lulas Th17, especialmente en los casos asociados   a infecciones virales con HTLV-1, citomegalovirus y   virus de Epstein-Barr. La persistencia de las respuestas   Th17 podr&iacute;a estar favorecida por la disminuci&oacute;n   de las citocinas Th1, especialmente el IFN-&beta;, y por   el aumento de la IL-10 observado en los pacientes   con LCCT, y por la posible generaci&oacute;n de c&eacute;lulas   reguladoras adaptativas tanto Tr1 como Th3, estas   &uacute;ltimas productoras de TGF-&beta;, citocina directamente   relacionada con la inducci&oacute;n del linaje Th17 &#40;49,59&#41;.   La expresi&oacute;n de mARN para IL-17 y la producci&oacute;n de   IL-17 fueron informadas en l&iacute;neas celulares derivadas   de pacientes con MF y SS &#40;60&#41;. Tambi&eacute;n se ha   informado un aumento en la producci&oacute;n de IL-17 en   c&eacute;lulas mononucleares de sangre perif&eacute;rica aisladas   de pacientes con MF en estadio leve y la producci&oacute;n   de esta citocina disminuye a medida que avanza la   enfermedad &#40;37&#41;. El papel de las c&eacute;lulas Th17 en LCCT   a&uacute;n no est&aacute; completamente entendido.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Resistencia a la apoptosis como mecanismo de   evasi&oacute;n de la respuesta inmunol&oacute;gica</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Luego de una respuesta efectora se elimina la   mayor&iacute;a de las c&eacute;lulas T activadas para prevenir   su acumulaci&oacute;n excesiva y el da&ntilde;o tisular por un   mecanismo denominado <i>muerte inducida por     activaci&oacute;n</i> &#40;AICD, por la sigla en ingl&eacute;s de <i>activationinduced       cell death</i>&#41;. Despu&eacute;s de la activaci&oacute;n de las   c&eacute;lulas T y del control del ant&iacute;geno que desencaden&oacute; la respuesta inmune, se activa la v&iacute;a apical de muerte   celular por la uni&oacute;n del ligando Fas &#40;FasL, CD95L&#41; con   su receptor de superficie &#40;CD95&#41; &#40;61&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Algunas evidencias sugieren que la acumulaci&oacute;n   de las c&eacute;lulas tumorales se debe a su resistencia   a la apoptosis y no solamente al aumento de la   proliferaci&oacute;n. Las c&eacute;lulas del clon maligno regulan   negativamente la expresi&oacute;n de receptores de muerte   como Fas y el TNF-R1 &#40;61&#41;. Klemke y colaboradores   &#40;62&#41; encontraron que las c&eacute;lulas de los pacientes con   LCCT eran resistentes a la AICD; mostraron que estas   c&eacute;lulas ten&iacute;an niveles elevados de cFLIP &#40;prote&iacute;na   inhibidora de CD95&#41; y que adem&aacute;s eran incapaces de   regular positivamente la expresi&oacute;n de CD95L despu&eacute;s   de la activaci&oacute;n. Observaron adem&aacute;s que las c&eacute;lulas   de estos pacientes presentaban niveles reducidos   de se&ntilde;alizaci&oacute;n a trav&eacute;s del TCR, lo que les permite   escapar de los mecanismos de muerte por activaci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>Alteraciones inmunol&oacute;gicas en la MF y su papel en   la progresi&oacute;n de la enfermedad</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Entre las alteraciones inmunol&oacute;gicas descritas en   MF/SS est&aacute;n la disminuci&oacute;n de las c&eacute;lulas Th1 y de la   actividad de las c&eacute;lulas NK, la eosinofilia, el aumento de   IgE e IgA, la alteraci&oacute;n de la respuesta de los linfocitos   a mit&oacute;genos, el cambio en la expresi&oacute;n de receptores   de superficie y diferencias en el perfil de citocinas &#40;63&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En la progresi&oacute;n de la MF se observa disminuci&oacute;n en las   c&eacute;lulas CD8<sup>&#43;</sup> y NK, que conduce a alteraciones en la defensa   contra microorganismos, permitiendo la reactivaci&oacute;n   de infecciones como el herpes z&oacute;ster, la aparici&oacute;n de   melanoma maligno, c&aacute;ncer de piel no melanoma y otras   neoplasias como c&aacute;ncer de colon y mama &#40;64&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En el SS se ha evidenciado la disminuci&oacute;n de las DC lo   cual puede contribuir a trastornos en la producci&oacute;n   de citocinas y disminuci&oacute;n en el desarrollo de   la inmunidad celular. En los pacientes con MF/SS   disminuye el porcentaje de c&eacute;lulas dendr&iacute;ticas   plasmocitoides CD123<sup>&#43;</sup> CD11c<sup>-/low</sup>, y en estas c&eacute;lulas   disminuye la producci&oacute;n de IFN-&alpha; e IL-12 &#40;63&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Alteraciones en la respuesta inmunol&oacute;gica   inducidas por el clon maligno: evidencias basadas   en los efectos del tratamiento</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el manejo de la MF/SS se emplean tratamientos   que act&uacute;an directamente en la piel y/o terapias   sist&eacute;micas. La selecci&oacute;n de la terapia depende   del estadio de gravedad del tumor. Muchas de las   alteraciones inmunol&oacute;gicas descritas en MF/SS las   genera el clon maligno, puesto que tras su eliminaci&oacute;n   con el tratamiento revierten muchos de los defectos   inmunes. Luego del tratamiento pueden restaurarse   la producci&oacute;n de citocinas Th1, la activaci&oacute;n exitosa   de c&eacute;lulas efectoras contra las c&eacute;lulas tumorales y la   funci&oacute;n de las APC. Muchos de los medicamentos   utilizados tienen la capacidad de inducir apoptosis de   las c&eacute;lulas tumorales y, adem&aacute;s, inhiben la producci&oacute;n   de IL-4 y su efecto supresor. La estrategia central para   la eliminaci&oacute;n de las c&eacute;lulas malignas es el uso de   agentes que puedan inducir apoptosis potenciando   la capacidad de las APC para procesar las c&eacute;lulas   apopt&oacute;ticas e inducir una respuesta citot&oacute;xica.   Estudios realizados por Berger y colaboradores &#40;31&#41;   demuestran que DC de pacientes con MF pulsadas   con c&eacute;lulas apopt&oacute;ticas del mismo paciente tienen la   capacidad de potenciar la presentaci&oacute;n antig&eacute;nica y   por ende la respuesta inmunol&oacute;gica; este fen&oacute;meno,   observado <i>in vitro</i>, podr&iacute;a ser semejante a lo que   ocurre en los pacientes luego de recibir la fotof&eacute;resis.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Entre los tratamientos de primera l&iacute;nea para la MF en el   estadio de parches o placas limitadas &#40;menos del 10&#37; de   la superficie corporal&#41; est&aacute;n los corticosteroides t&oacute;picos   y la fotoquimioterapia PUVA &#40;psoral&eacute;n m&aacute;s fototerapia   con luz ultravioleta A&#41;, los cuales inducen apoptosis   de las c&eacute;lulas malignas, disminuyen el n&uacute;mero de   LC lo que interrumpe la presentaci&oacute;n antig&eacute;nica   persistente a las c&eacute;lulas malignas. En los tratamientos   para MF en estadios avanzados, la administraci&oacute;n de   IFN-&alpha; potencia la actividad citot&oacute;xica de los CD8<sup>&#43;</sup> y   las c&eacute;lulas NK, suprime la producci&oacute;n de citocinas tipo   Th2 y aumenta la expresi&oacute;n de Fas incrementando el   porcentaje de apoptosis de las c&eacute;lulas malignas &#40;27&#41;. En   los pacientes que presentan afectaci&oacute;n hematol&oacute;gica   &#40;SS&#41;, la utilizaci&oacute;n de fotof&eacute;resis extracorp&oacute;rea &#40;ECP,   por la sigla en ingl&eacute;s de <i>extracorporeal photopheresis</i>&#41;,   induce apoptosis de las c&eacute;lulas malignas en la sangre   perif&eacute;rica y promueve la generaci&oacute;n de DC a partir de   monocitos de sangre perif&eacute;rica, que captan los ant&iacute;genos   derivados de las c&eacute;lulas malignas apopt&oacute;ticas para   presentarlos a los linfocitos T CD8<sup>&#43;</sup> por mecanismos de   presentaci&oacute;n cruzada. Los linfocitos T CD8<sup>&#43;</sup> generan   respuestas antitumorales eficientes que contribuyen al   control de la enfermedad &#40;27&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Como se mencion&oacute; anteriormente, poco se sabe del   papel que juegan las c&eacute;lulas Treg en el desarrollo del   LCCT; existen pocas evidencias de terapias utilizadas   para aumentarlas en n&uacute;mero, o para suprimir su acci&oacute;n   reguladora. Sin embargo, se ha propuesto utilizar   anticuerpos bloqueantes anti-CTLA-4, anti-IL-10 y anti-   TGF-&beta; en la terapia del LCCT, porque se ha visto que   tienen la capacidad de revertir los efectos inhibidores   observados en el sistema inmune &#40;63&#41;. El desarrollo   de terapias que permitan mejorar el pron&oacute;stico de la   enfermedad incluso en los estadios tempranos ser&iacute;a   de gran importancia para lograr una mayor tasa de   supervivencia de los pacientes con LCCT.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSIONES</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El LCCT es una enfermedad cr&oacute;nica y progresiva   caracterizada por la presencia de un clon maligno   de c&eacute;lulas T en la piel. Durante la progresi&oacute;n de la   enfermedad se observa un perfil de citocinas tipo Th2   y una disminuci&oacute;n en la respuesta Th1, lo que se asocia   a un estado de inmunosupresi&oacute;n que predispone a la   aparici&oacute;n de segundas neoplasias y enfermedades   infecciosas. De tal forma que la regulaci&oacute;n de las   citocinas Th1 y Th2 parece ser un factor cr&iacute;tico en la   progresi&oacute;n de la enfermedad &#40;37&#41;. Lo anterior podr&iacute;a   tener aplicaciones terap&eacute;uticas importantes como la   terapia de reemplazo de citocinas Th1 con prote&iacute;nas   recombinantes.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las evidencias de la presencia de c&eacute;lulas CD4<sup>&#43;</sup>CD25<sup>high</sup> en los linfomas cut&aacute;neos sugieren que el LCCT podr&iacute;a   ser una neoplasia de c&eacute;lulas T reguladoras, o estar   muy relacionado con alteraciones en la regulaci&oacute;n   inmune &#40;40&#41;. Estudios encaminados a la comprensi&oacute;n   de la inmunobiolog&iacute;a de las c&eacute;lulas Treg y Th17 en   pacientes con LCCT podr&iacute;an contribuir al dise&ntilde;o de   nuevas estrategias terap&eacute;uticas y de herramientas para   evaluar el pron&oacute;stico y hacer seguimiento cl&iacute;nico. Los   avances en las t&eacute;cnicas diagn&oacute;sticas permitir&aacute;n en un   futuro el tratamiento temprano de los LCCT. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>REFERENCIAS BIBLIOGR&Aacute;FICAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1. Hwang ST, Janik JE, Jaffe ES, Wilson WH. Mycosis   fungoides and Sezary syndrome. Lancet. 2008 Mar   15;371&#40;9616&#41;:945-57.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000077&pid=S0121-0793201100040000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 2. Onsun N, Kural Y, Su O, Demirkesen C, Buyukbabani   N. 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