<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952012000400005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Células troncales mesenquimales: biología, caracterización y futuras aplicaciones en salud y producción de especies pecuarias. Parte I]]></article-title>
<article-title xml:lang="en"><![CDATA[Mesenchymal stem cells: biology, characterization and future applications to animal health and livestock production. Part I]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Serrano]]></surname>
<given-names><![CDATA[Rosa M.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Espinosa]]></surname>
<given-names><![CDATA[Jesús J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Shimada]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Antaramian]]></surname>
<given-names><![CDATA[Anaid]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piña]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[Ofelia]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Unidad Cuautitlán]]></institution>
<addr-line><![CDATA[Querétaro estado de Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Neurobiología ]]></institution>
<addr-line><![CDATA[Querétaro estado de Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>46</volume>
<numero>4</numero>
<fpage>371</fpage>
<lpage>382</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952012000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952012000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952012000400005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las células troncales mesenquimales poseen características que las convierten en un modelo único para la investigación en el área biomédica. Su empleo como herramienta biotecnológica permite soluciones innovadoras a problemas de salud en humanos y animales. Estas células se caracterizan por una alta capacidad proliferativa siendo viables por periodos prolongados y por su multipotencialidad al diferenciarse a diversos linajes celulares, radicando en ello su valor para la ingeniería y reparación de tejidos, tratamiento de enfermedades y manipulación de la diferenciación celular, e incluso la producción animal. El presente ensayo abarca aspectos básicos de su biología y caracterización en las especies domésticas, enfatizando la necesidad de homogenizar los criterios que permitirían caracterizar estas células en las especies pecuarias y sus posibles aplicaciones en salud y producción pecuaria.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Mesenchymal stem cells have characteristics that make them a unique model for research in the biomedical area. Its use as a biotechnological tool allows for innovative solutions for health problems in humans and animals. These cells are characterized by a high proliferative capacity of being viable for long periods and for their multipotent capacity to differentiate into a wide variety of cell lineages, having in it their value for tissue engineering and repair, treatment of diseases and manipulation of cell differentiation and even animal production. This paper covers basic aspects of their biology and characterization in domestic species emphasizing the need to homogenize the criteria that would allow to characterize these cells in the livestock species and their possible applications in health and livestock production.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[células troncales mesenquimales]]></kwd>
<kwd lng="es"><![CDATA[médula ósea]]></kwd>
<kwd lng="es"><![CDATA[caracterización]]></kwd>
<kwd lng="es"><![CDATA[diferenciación celular]]></kwd>
<kwd lng="es"><![CDATA[reparación de tejido]]></kwd>
<kwd lng="es"><![CDATA[multipotencialidad]]></kwd>
<kwd lng="en"><![CDATA[mesenchymal stem cells]]></kwd>
<kwd lng="en"><![CDATA[bone marrow]]></kwd>
<kwd lng="en"><![CDATA[characterization]]></kwd>
<kwd lng="en"><![CDATA[cell differentiation]]></kwd>
<kwd lng="en"><![CDATA[tissue repair]]></kwd>
<kwd lng="en"><![CDATA[multipotentiality]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Ciencia animal</font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="center"><font face="verdana" size="4"><b>C&eacute;lulas troncales mesenquimales: biolog&iacute;a, caracterizaci&oacute;n y futuras aplicaciones en salud y producci&oacute;n de especies pecuarias. Parte I</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Mesenchymal stem cells: biology, characterization and future applications to animal health and livestock production. Part I</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Rosa M. P&eacute;rez&#45;Serrano<sup>1</sup>, Jes&uacute;s J. Ram&iacute;rez&#45;Espinosa<sup>1</sup>, Armando Shimada<sup>2</sup>, Anaid Antaramian<sup>3</sup>, Enrique Pi&ntilde;a<sup>4</sup>, Ofelia Mora<sup>2*</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Programa de Posgrado en Ciencias de la Producci&oacute;n y de la Salud Animal, Universidad Nacional Aut&oacute;noma de M&eacute;xico (UNAM). M&eacute;xico.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Laboratorio de Rumiolog&iacute;a y Metabolismo Nutricional (RuMeN). Facultad de Estudios Superiores&#45;Cuautitl&aacute;n, UNAM. Blvd. Juriquilla 3001, Quer&eacute;taro, estado de Quer&eacute;taro. 76230, M&eacute;xico.</i> (<a href="mailto:ofemora66@unam.mx">ofemora66@unam.mx</a>). <sup>*</sup> Autor responsable.</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>3</sup> Instituto de Neurobiolog&iacute;a, UNAM. Blvd. Juriquilla 3001, Quer&eacute;taro, estado de Quer&eacute;taro. 76230, M&eacute;xico.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Facultad de Medicina, UNAM. Circuito Interior, Ciudad Universitaria, Av. Universidad 3000, D. F. 0451, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: septiembre, 2011.    <br> 	Aprobado: mayo, 2012.</font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas troncales mesenquimales poseen caracter&iacute;sticas que las convierten en un modelo &uacute;nico para la investigaci&oacute;n en el &aacute;rea biom&eacute;dica. Su empleo como herramienta biotecnol&oacute;gica permite soluciones innovadoras a problemas de salud en humanos y animales. Estas c&eacute;lulas se caracterizan por una alta capacidad proliferativa siendo viables por periodos prolongados y por su multipotencialidad al diferenciarse a diversos linajes celulares, radicando en ello su valor para la ingenier&iacute;a y reparaci&oacute;n de tejidos, tratamiento de enfermedades y manipulaci&oacute;n de la diferenciaci&oacute;n celular, e incluso la producci&oacute;n animal. El presente ensayo abarca aspectos b&aacute;sicos de su biolog&iacute;a y caracterizaci&oacute;n en las especies dom&eacute;sticas, enfatizando la necesidad de homogenizar los criterios que permitir&iacute;an caracterizar estas c&eacute;lulas en las especies pecuarias y sus posibles aplicaciones en salud y producci&oacute;n pecuaria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave</b>: c&eacute;lulas troncales mesenquimales, m&eacute;dula &oacute;sea, caracterizaci&oacute;n, diferenciaci&oacute;n celular, reparaci&oacute;n de tejido, multipotencialidad.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Mesenchymal stem cells have characteristics that make them a unique model for research in the biomedical area. Its use as a biotechnological tool allows for innovative solutions for health problems in humans and animals. These cells are characterized by a high proliferative capacity of being viable for long periods and for their multipotent capacity to differentiate into a wide variety of cell lineages, having in it their value for tissue engineering and repair, treatment of diseases and manipulation of cell differentiation and even animal production. This paper covers basic aspects of their biology and characterization in domestic species emphasizing the need to homogenize the criteria that would allow to characterize these cells in the livestock species and their possible applications in health and livestock production.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words</b>: mesenchymal stem cells, bone marrow, characterization, cell differentiation, tissue repair, multipotentiality.</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Apartir del a&ntilde;o 2000 el estudio de las c&eacute;lulas troncales tom&oacute; auge debido a sus diferentes aplicaciones biol&oacute;gicas, convirti&eacute;ndose en un modelo para estudiar la biolog&iacute;a molecular, celular y los procesos de organog&eacute;nesis. El mejor conocimiento de sus caracter&iacute;sticas favorecer&aacute; la manipulaci&oacute;n de la diferenciaci&oacute;n celular con el objetivo de resolver diversas problem&aacute;ticas en m&uacute;ltiples a&eacute;reas, y aqu&iacute; se enfatiza la cl&iacute;nica veterinaria y la zootecnia.</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Biolog&iacute;a</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas troncales (CT) presentan la capacidad de pluripotencialidad o multipotencialidad al diferenciarse a linajes celulares diversos y proliferar en forma indiferenciada (Bianchi de Di Risio, 2004; Lindner <i>et al</i>., 2010); por su origen las CT se clasifican en embrionarias (CTE) y som&aacute;ticas (CTS). Las CTE derivan de la masa celular interna del blastocisto, y a partir de ellas se originan las capas germinales en el embri&oacute;n, por lo que se consideran c&eacute;lulas pluripotenciales capaces de diferenciarse hacia cualquier linaje celular en el organismo (Jiang <i>et al</i>., 2002). Las CTS son c&eacute;lulas multipotenciales (con capacidad de diferenciaci&oacute;n limitada a algunos linajes celulares) provenientes de diversos tejidos y que, por su capacidad de autorrenovaci&oacute;n, pueden ser cultivadas por largos periodos (Kuroda <i>et al</i>., 2010).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Las CTS se han aislado de rat&oacute;n, rata, perro, mono, cerdo, oveja, cabra, conejo, gato, pollo (Khatri <i>et al</i>., 2009) y humano (Liechty <i>et al</i>., 2000) y de diferentes tejidos: m&eacute;dula &oacute;sea (MO), tejido adiposo (Fraser <i>et al</i>., 2008), cord&oacute;n umbilical (Mendes <i>et al</i>., 2005), m&uacute;sculo (Jiang <i>et al</i>., 2002), placenta, sangre perif&eacute;rica (He <i>et al</i>., 2007), m&uacute;sculo esquel&eacute;tico, dermis, membrana sinovial, tejido pulmonar (Ar&eacute;valo <i>et al</i>., 2007), h&iacute;gado fetal (Sarugaser <i>et al</i>., 2009) ri&ntilde;&oacute;n y p&aacute;ncreas (da Silva <i>et al</i>., 2006), siendo los tres primeros tejidos los sitios de aislamiento m&aacute;s frecuentes. La utilizaci&oacute;n de CTS de tejidos espec&iacute;ficos en aplicaciones como la terapia celular tiene como restricciones el &eacute;xito del aislamiento, la invasividad de la t&eacute;cnica y la cantidad y plasticidad de las c&eacute;lulas aisladas. La plasticidad de las CTS <i>in vivo</i> de los animales adultos se encuentra limitada, orient&aacute;ndose la capacidad de diferenciaci&oacute;n hacia los linajes celulares de los tejidos donde residen. Se ha mostrado que, <i>in vitro</i>, las c&eacute;lulas comprometidas pueden ser reprogramadas y diferenciarse a m&aacute;s de un tipo celular (H&aring;kelien <i>et al</i>., 2002). La m&eacute;dula &oacute;sea es donde presentan menor compromiso, conservando la plasticidad que las caracteriza.</font></p>  	    <p align="justify"><font face="verdana" size="2">La metodolog&iacute;a para obtener CTS desde la MO, estandarizada en la d&eacute;cada de 1990, consiste en la aspiraci&oacute;n de la MO de la cresta il&iacute;aca o la ep&iacute;fisis femoral y la selecci&oacute;n de c&eacute;lulas mediante gradientes de densidad. La MO es un tejido sinusoidal localizado en la cavidad medular de los huesos largos, estern&oacute;n, huesos de la cadera y v&eacute;rtebras esponjosas; est&aacute; compuesta por c&eacute;lulas endoteliales, reticulares, adipocitos, macr&oacute;fagos, fibroblastos, c&eacute;lulas precursoras osteog&eacute;nicas y c&eacute;lulas troncales som&aacute;ticas (Majumdar <i>et al</i>., 1998). La funci&oacute;n principal de la MO es proveer y movilizar CTS para reparar el tejido da&ntilde;ado en el organismo, por lo cual es el sitio con mayores reservas (Neuss <i>et al</i>., 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTS de MO se clasifican en dos grupos: c&eacute;lulas hematopoy&eacute;ticas (CH) y CT mesenquimales (CTM). Las CH presentan multipotencialidad hacia eritrocitos, macr&oacute;fagos, neutr&oacute;filos, bas&oacute;filos, linfocitos y megacariocitos (Bianchi de Di Risio, 2004; Hombach&#45;Klonisch <i>et al</i>., 2008), constituyen s&oacute;lo una peque&ntilde;a porci&oacute;n de las c&eacute;lulas nucleadas aisladas, aproximadamente una c&eacute;lula por cada 10<sup>4</sup> a 10<sup>8</sup> c&eacute;lulas, y pueden aislarse de MO, sangre perif&eacute;rica y sangre del cord&oacute;n umbilical (Hombach&#45;Klonisch <i>et al</i>., 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTM presentan multipotencialidad hacia tejidos conjuntivos como hueso (Dong <i>et al</i>., 2009), cart&iacute;lago (Vidal <i>et al</i>., 2006), adiposo, muscular (Zeng <i>et al</i>., 2006) y neuronal, entre otros; son altamente proliferativas lo que permite mantener cultivos celulares durante largos periodos. Los cultivos <i>in vitro</i> constan de una poblaci&oacute;n heterog&eacute;nea (Bianco <i>et al</i>., 2001) y morfol&oacute;gicamente presentan forma espigada (denominada fibroblastoide), con un n&uacute;cleo grande, alargado y c&eacute;ntrico con dos o tres nucl&eacute;olos (Flores&#45;Figueroa <i>et al</i>., 2006). En la <a href="/img/revistas/agro/v46n4/a5f1.jpg" target="_blank">Figura 1</a> se muestran las morfologias de las CTS de cuatro especies pecuarias obtenidas a partir de m&eacute;dula &oacute;sea y dermis, mostrando diferencias en el tama&ntilde;o, forma y organizaci&oacute;n en el cultivo <i>in vitro</i>; sin embargo, conservan las caracteristicas morfol&oacute;gicas antes descritas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las funciones end&oacute;genas de las CTM en la reparaci&oacute;n de tejido son poco claras. Sin embargo, se ha determinado que aumentan la proliferaci&oacute;n y controlan la vasculog&eacute;n&eacute;sis mediante la secreci&oacute;n de citocinas y factores de crecimiento (interleucina 6 (IL&#45;6), IL&#45;11, factor inhibidor de leucemia y factor de estimulaci&oacute;n de colonias de macr&oacute;fagos y granulocitos) que permiten la regeneraci&oacute;n del tejido da&ntilde;ado (Tuan <i>et al</i>., 2003).</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Caracterizaci&oacute;n</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Dominici <i>et al</i>. (2006), a nombre de la Sociedad Internacional de Terapia Celular (ISCT), se&ntilde;alan cinco criterios b&aacute;sicos para identificar una poblaci&oacute;n celular como CTM.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Capacidad de adherencia al pl&aacute;stico</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTM presentan la habilidad de adherencia al pl&aacute;stico (Ar&eacute;valo <i>et al</i>., 2007; Bianco <i>et al</i>., 2001) lo cual permite seleccionarlas de la poblaci&oacute;n heterog&eacute;nea de la que son aisladas (incluyendo las CH y c&eacute;lulas reticulares) y que carecen de esta capacidad (Chamberlain <i>et al</i>., 2007).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Capacidad proliferativa</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTM pueden cultivarse <i>in vitro</i> por periodos prolongados en estado indiferenciado y alcanzan un periodo de vida de entre 15 y 50 duplicaciones celulares (Grove <i>et al</i>., 2004), por lo cual s&oacute;lo pueden mantenerse durante un n&uacute;mero limitado de subcultivos. Despu&eacute;s ocurre una reducci&oacute;n progresiva de la proliferaci&oacute;n, por lo que se les denomina L&iacute;neas Celulares Finitas (Freshney, 2006). Esta reducci&oacute;n en las CTM es m&aacute;s temprana en contraste a las CTE donde la capacidad proliferativa est&aacute; altamente conservada debido a un mecanismo de transcripci&oacute;n inversa end&oacute;gena que les permite conservar sus tel&oacute;meros (Colleoni <i>et al.,</i> 2005). Sin embargo, debido a que no existen l&iacute;neas celulares de CTE de especies pecuarias y las CTM poseen caracter&iacute;sticas similares, son un modelo &uacute;til de estudio para la investigaci&oacute;n y desarrollo de tecnolog&iacute;as en el mejoramiento gen&eacute;tico, clonaci&oacute;n y reproducci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTM <i>in vitro</i> presentan un ciclo celular de tres periodos durante el cultivo: 1) Periodo de Retraso, dura 12 a 24 h, las c&eacute;lulas reconstituyen el citoesqueleto y secretan prote&iacute;nas de matriz extracelular para adherirse al pl&aacute;stico; 2) Fase Exponencial donde la poblaci&oacute;n celular se duplica, ocurriendo varias veces durante el cultivo; 3) Fase Estacionaria, momento id&oacute;neo para la inducci&oacute;n de la diferenciaci&oacute;n celular al reducir su crecimiento.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para determinar la capacidad de proliferaci&oacute;n durante el cultivo se eval&uacute;an tres caracter&iacute;sticas: 1) n&uacute;mero de duplicaciones celulares que es la cantidad de duplicaciones que ocurren en las c&eacute;lulas cultivadas en un tiempo determinado (Vidal <i>et al.,</i> 2006) y en experimentos con CTM de bovinos y porcinos hubo 40 a 50 duplicaciones acumuladas despu&eacute;s de 10 a 15 subcultivos (Colleoni <i>et al.,</i> 2005); 2) tiempo de duplicaci&oacute;n celular que es el tiempo necesario para la duplicaci&oacute;n de una c&eacute;lula y en CTM de equino es 4.9&plusmn;1.6 d para c&eacute;lulas del primer subcultivo (Vidal <i>et al.,</i> 2006); 3) una curva de crecimiento celular acumulativa que muestra el comportamiento de las c&eacute;lulas a lo largo del cultivo respecto a su capacidad de proliferaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">En muestras de c&eacute;lulas aisladas de MO, la evaluaci&oacute;n de estas tres caracter&iacute;sticas permite determinar la capacidad de autorrenovaci&oacute;n, caracter&iacute;stica indispensable para ser consideradas como CTM. En varias investigaciones se reporta tiempos de duplicaci&oacute;n celular para las CTM de algunas especies dom&eacute;sticas; sin embargo, no existen criterios uniformes sobre las caracter&iacute;sticas de proliferaci&oacute;n siendo necesaria la investigaci&oacute;n y la estandarizaci&oacute;n de dichos criterios.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Detecci&oacute;n de prote&iacute;nas de superficie</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Para identificar los marcadores de superficie de las CTM se usan t&eacute;cnicas basadas en el uso de anticuerpos espec&iacute;ficos como citometr&iacute;a de flujo, inmunocitoqu&iacute;mica (ICQ), western blot e inmunomicroscop&iacute;a electr&oacute;nica. La mayor limitante de esas t&eacute;cnicas es la falta de una mol&eacute;cula espec&iacute;fica conocida que permita la identificaci&oacute;n correcta y es necesario usar una serie de anticuerpos contra ant&iacute;genos expresados de manera preferencial (aunque no exclusiva) en las CTM. Es importante tipificar la poblaci&oacute;n aislada, para lo cual la ISCT public&oacute; en el 2006 un listado que incluye anticuerpos para identificar las CTM y las CH (<a href="/img/revistas/agro/v46n4/a5c1.jpg" target="_blank">Cuadro 1</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">Ese listado no identifica exclusivamente a las CTM, pero tomando en cuenta el origen y tipo de tejido aislado, se puede deducir su presencia (Dominici <i>et al</i>., 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los anticuerpos probados para determinar la identidad de las CTM de varias especies son usados como modelos de estudio para problem&aacute;ticas cl&iacute;nicas del ser humano (<a href="/img/revistas/agro/v46n4/a5c2.jpg" target="_blank">Cuadro 2</a>). Las investigaciones en medicina veterinaria y zootecnia son reducidas y no se han determinado los anticuerpos espec&iacute;ficos de las CTM para cada especie, por lo cual se usan anticuerpos dise&ntilde;ados para los modelos animales estudiados m&aacute;s frecuentemente (rata, rat&oacute;n y humano). Lo anterior genera un &aacute;rea de oportunidad en la ciencia veterinaria para determinar los ant&iacute;genos expresados en las especies dom&eacute;sticas y despu&eacute;s dise&ntilde;ar los anticuerpos espec&iacute;ficos, para facilitar la identificaci&oacute;n de las CTM. Esto resolver&iacute;a la controversia generada en investigaciones donde la falta de reactividad a los anticuerpos por las CTM puede deberse a que carecen de la expresi&oacute;n de tales marcadores o el anticuerpo usado no lo reconoce. Rozemuller <i>et al</i>. (2010) en un panel de 43 anticuerpos determinaron que reaccionan positivamente en varias especies, y reportaron los anticuerpos CD271, W8B2, W4A5, CD56, W3C4 (CD349), W5C4 y 58B1 con reacci&oacute;n positiva en mono, cabra, borrego, cerdo y perro.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Expresi&oacute;n de factores de transcripci&oacute;n</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En las c&eacute;lulas de mam&iacute;fero la multipotencialidad est&aacute; bajo control de los factores de transcripci&oacute;n Oct4, Nanog, Sox2 y FoxD3; su expresi&oacute;n se modifica cuando la c&eacute;lula se compromete a un linaje celular espec&iacute;fico iniciando la expresi&oacute;n de otros genes. La expresi&oacute;n de estos genes en las CTM es controversial porque son marcadores particulares de CTE.</font></p>  	    <p align="justify"><font face="verdana" size="2">Sin embargo, el factor de transcripci&oacute;n vinculante 4 (Oct 4) est&aacute; presente en las CTE y en las CTM. En c&eacute;lulas tumorales se ha determinado la expresi&oacute;n de Oct4 y Nanog lo que confirma su alta capacidad proliferativa y viabilidad durante periodos prolongados (Jeter <i>et al</i>., 2009; Kong <i>et al</i>., 2010). Adem&aacute;s se ha determinado la expresi&oacute;n de estos genes en diferentes especies (<a href="#c3">Cuadro 3</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="c3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/agro/v46n4/a5c3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">A excepci&oacute;n de las investigaciones realizadas en CT de cerdos, aves y equinos (Violini <i>et al</i>., 2009), en las dem&aacute;s especies dom&eacute;sticas la determinaci&oacute;n de estos factores de transcripci&oacute;n se ha limitado a CTE. La identificaci&oacute;n de la expresi&oacute;n de dichos factores en las CTS en las especies dom&eacute;sticas brindar&iacute;a mayor informaci&oacute;n sobre las capacidades de autorrenovaci&oacute;n y diferenciaci&oacute;n de estas c&eacute;lulas, as&iacute; como los patrones de expresi&oacute;n que determinan tales capacidades. Adem&aacute;s, el uso de los factores de transcripci&oacute;n para la generaci&oacute;n de c&eacute;lulas pluripotenciales, inducidas mediante tecnolog&iacute;as de ADN recombinante, permitir&aacute; la generaci&oacute;n de l&iacute;neas celulares de CTS con una mayor capacidad de proliferaci&oacute;n y diferenciaci&oacute;n. Las l&iacute;neas generadas de esta forma tendr&iacute;an aplicaciones en el estudio de los mecanismos implicados en la regulaci&oacute;n del metabolismo, ingenier&iacute;a de tejidos y diferenciaci&oacute;n celular.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Multipotencialidad</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las CTM poseen la capacidad de diferenciarse a diversos tejidos, consider&aacute;ndose b&aacute;sica la capacidad adipog&eacute;nica, osteog&eacute;nica y condrog&eacute;nica; pero no est&aacute; limitada a estos linajes. Diversas investigaciones han logrado la diferenciaci&oacute;n a cardiomiocitos (Akavia <i>et al</i>., 2008), miocitos esquel&eacute;ticos <i>(Dezawa et al.,</i> 2005; Akavia <i>et al.,</i> 2008) y lisos (Narita <i>et al.,</i> 2008), c&eacute;lulas endoteliales, hepatocitos (Zeng <i>et al.,</i> 2006), c&eacute;lulas <i>&#946;</i> pancre&aacute;ticas (Liu <i>et al.,</i> 2010), c&eacute;lulas gliales y neuronas (Shiota <i>et al.,</i> 2007; Bi <i>et al.,</i> 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2">Para inducir la diferenciaci&oacute;n es necesario imitar el microambiente de los tejidos <i>in vivo</i> usando medios de cultivo con nutrientes, hormonas, citocinas, factores de crecimiento (incluidos en sueros animales o adicionados) y algunos compuestos sint&eacute;ticos.</font></p>  	    <p align="justify"><font face="verdana" size="2">En la diferenciaci&oacute;n de CTM a osteocitos al medio de cultivo se agregan suero fetal bovino, dexametasona, <i>&#946;</i>&#45;glicerofosfato y &aacute;cido asc&oacute;rbico; la diferenciaci&oacute;n a condrocitos se induce con los factores de crecimiento transformante <i>&#946;1</i> y 3 (TGF&#45;<i>&#946;</i>1, TGF&#45;<i>&#946;</i>3), prote&iacute;na morfogen&eacute;tica 4 (BMP4), insulina, transferrina y selenito de sodio (ITS); y la diferenciaci&oacute;n adipog&eacute;nica utiliza dexametasona, indometacina, insulina e isobutil&#45;metil xantina (IBMX) (Pittenger <i>et al.,</i> 1999).</font></p>  	    <p align="justify"><font face="verdana" size="2">La evaluaci&oacute;n de la capacidad de diferenciaci&oacute;n de las CTM se lleva a cabo con t&eacute;cnicas de laboratorio e incluyen el uso de tinciones espec&iacute;ficas para microscop&iacute;a de campo claro (MCC), pruebas de actividad enzim&aacute;tica, t&eacute;cnicas inmunoqu&iacute;micas &#91;Western blot (WB), inmunocitoqu&iacute;mica (ICQ)&#93; e inmunomicroscop&iacute;a electr&oacute;nica (MET, I&#45;MET) y biolog&iacute;a molecular &#91;RT&#45;PCR, PCR en tiempo real o cuantitativo (qPCR) y microarreglos de ADN&#93; (<a href="/img/revistas/agro/v46n4/a5c4.jpg" target="_blank">Cuadro 4</a>).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La multipotencialidad convierte a las CTM en modelos de investigaci&oacute;n para la terapia celular, ingenier&iacute;a de tejidos, inmunomodulaci&oacute;n, estudios de metabolismo y diferenciaci&oacute;n celular, as&iacute; como de sustancias que los modifiquen. En el &aacute;rea cl&iacute;nica se les puede utilizar en aplicaciones como enfermedades cr&oacute;nicas degenerativas (displasia de cadera y codo en perro), lesiones articulares (tendinitis y bursitis en caballos); mientras que en la zootecnia el aprovechamiento de la multipotencialidad de las CTM para evaluar f&aacute;rmacos que modifiquen los procesos de diferenciaci&oacute;n celular y metab&oacute;licos permitir&aacute; obtener sustancias que modifiquen las caracter&iacute;sticas de la carne.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La validaci&oacute;n de los resultados obtenidos en experimentos con c&eacute;lulas troncales mesenquimales es necesaria y es importante usar diferentes m&eacute;todos para su caracterizaci&oacute;n. Dentro de esta caracterizaci&oacute;n, la capacidad de adherencia al pl&aacute;stico, la capacidad proliferativa y multipotencialidad est&aacute;n bien definidas para las c&eacute;lulas troncales mesenquimales, mientras que la expresi&oacute;n de marcadores de superficies y factores de transcripci&oacute;n es controversial, porque no se conoce un marcador espec&iacute;fico y a dichos genes se consideran como marcadores de c&eacute;lulas troncales embrionarias.</font></p>  	    <p align="justify"><font face="verdana" size="2">Sin embargo, las propiedades de las c&eacute;lulas troncales mesenquimales las hacen un modelo id&oacute;neo para la investigaci&oacute;n en zootecnia donde se pueden usar en estudios sobre calidad de carne y comportamiento productivo, as&iacute; como en el &aacute;rea cl&iacute;nica para la regeneraci&oacute;n e ingenier&iacute;a de tejidos. Los puntos anteriores ser&aacute;n abarcados en la segunda parte del presente ensayo.</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>  	    <p align="justify"><font face="verdana" size="2">Este estudio fue financiado por el Proyecto PAPIIT IN200910 (UNAM, M&eacute;xico). Este trabajo es parte de la tesis doctoral (UNAM) de los dos primeros autores, quienes contribuyeron de igual forma a su realizaci&oacute;n. Ambos agradecen al CONACYT la beca otorgada en la Facultad de Estudios Superiores&#45;Cuautitl&aacute;n, UNAM, M&eacute;xico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    ]]></body>
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