<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402006000800007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Filamina plaquetaria: Una proteína del citoesqueleto integradora de la función celular+]]></article-title>
<article-title xml:lang="en"><![CDATA[Platelet filamin: A cytoskeletal protein involved in cell signal integration and function]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jay]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología, Ignacio Chávez Departamento de Biomedicina Cardiovascular ]]></institution>
<addr-line><![CDATA[México, D.F. ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>76</volume>
<fpage>67</fpage>
<lpage>75</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402006000800007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402006000800007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402006000800007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La activación de receptores celulares por estímulos fisiológicos o exógenos produce cambios dramáticos en la forma y función celulares; tales cambios dependen principalmente de la reestructuración de la malla de actina. En plaquetas se ha obtenido mucha de la información sobre el citoesqueleto. Dentro de las proteínas entrecruzadoras de actina filamentosa (Actina-F) como la espectrina, la fimbrina o la alfa actinina, la Filamina A (FLNa) es la más eficiente en formar geles ortogonales tridimensionales de actina. Además, une al citoesqueleto periférico de actina con la membrana celular a través de su dominio C-terminal de unión a glicoproteínas de membrana. La filamina mantiene la citoarquitectura plaquetaria y es esencial para el movimiento y cambio de formas celulares que suceden durante la activación plaquetaria. Estudios previos han mostrado que una gran variedad de proteínas con distintas funciones tales como traducción de señales, regulación de la transcripción de genes y movilización de receptores se asocian a la filamina, sugiriendo que ésta puede actuar como andamiaje u organizador de proteínas. El propósito de esta comunicación es el de describir brevemente las características de las macromoléculas asociadas a la FLNa plaquetaria y discutir un posible papel de la asociación de éstas a la filamina.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Activation of cellular receptors by diverse stimuli induces dramatic changes in shape and function to respond to the new circumstances of the cell. This modified behavior depends on the reorganization of the peripheral actin meshwork. An outstanding example of these processes can be found in platelets, from which much of the information available on cytoskeletal function has been obtained. Among the many actin-crosslinking proteins like spectrin, fimbrin or alpha actinin, filamin a (FLNa) emerges as the one with the highest potential in initiating the polimerization of actin filaments (F-actin) during the formation of tridimensional actin gels. FLNa also links actin filaments to the cytosolic domain of many membrane glycoproteins in platelets through its C-terminal region. In addition to participating in cell shape changes, FLNa is a scaffoldding protein that recruits numerous proteins involved in a completely different set of functions, including signal transduction, gene transcription regulation, and receptor translocation; however, the physiological role of FLNa in these processes has remained elusive. The purpose of the present communication is to briefly describe the characteristics of the macromolecules able to interact with FLNa and to discuss a possible role of FLNa during the transduction of signals from those molecular elements in platelets.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Activación plaquetaria]]></kwd>
<kwd lng="es"><![CDATA[Citoesqueleto]]></kwd>
<kwd lng="es"><![CDATA[Filamina A]]></kwd>
<kwd lng="es"><![CDATA[Plaquetas]]></kwd>
<kwd lng="es"><![CDATA[Receptor de von Willebrand]]></kwd>
<kwd lng="es"><![CDATA[Integrina llb/llla]]></kwd>
<kwd lng="en"><![CDATA[llb/llla Integrin]]></kwd>
<kwd lng="en"><![CDATA[Cytoskeleton]]></kwd>
<kwd lng="en"><![CDATA[Filamin A]]></kwd>
<kwd lng="en"><![CDATA[Platelets]]></kwd>
<kwd lng="en"><![CDATA[Platelet activation]]></kwd>
<kwd lng="en"><![CDATA[von Willebrand receptor]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n b&aacute;sica</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><i><b>Filamina plaquetaria: Una prote&iacute;na del citoesqueleto integradora de la funci&oacute;n celular+</b></i></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="3"><b>Platelet filamin: A cytoskeletal protein involved in cell signal integration and function</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>Elizabeth Garc&iacute;a,* David Jay*</b></font></p>     <p align="center">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiolog&iacute;a, Ignacio Ch&aacute;vez.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>+ </sup>Este trabajo fue apoyado en parte por el donativo U40188&#150;Q del Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACYT) otorgado a David Jay.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia</b>:     <br>     <i> Ma. Elizabeth Garc&iacute;a.     <br>     Departamento de Biomedicina Cardiovascular,     <br>     Instituto Nacional de Cardiolog&iacute;a, Ignacio Ch&aacute;vez.     <br>     (INCICH Juan Badiano N&uacute;m. 1 Col. Seci&oacute;n XVI, Tlalpan 14080. M&eacute;xico, D.F.).    <br> Tel. 5573&#150;2911 Ext. 1237 Fax 5573&#150;0926.    <br>  </i><b>Correo electr&oacute;nico:</b> <a href="mailto:gape3y1@yahoo.com">gape3y1@yahoo.com</a></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font size="2" face="verdana"><b>Resumen</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La activaci&oacute;n de receptores celulares por est&iacute;mulos fisiol&oacute;gicos o ex&oacute;genos produce cambios dram&aacute;ticos en la forma y funci&oacute;n celulares; tales cambios dependen principalmente de la reestructuraci&oacute;n de la malla de actina. En plaquetas se ha obtenido mucha de la informaci&oacute;n sobre el citoesqueleto. Dentro de las prote&iacute;nas entrecruzadoras de actina filamentosa (Actina&#150;F) como la espectrina, la fimbrina o la alfa actinina, la Filamina A (FLNa) es la m&aacute;s eficiente en formar geles ortogonales tridimensionales de actina. Adem&aacute;s, une al citoesqueleto perif&eacute;rico de actina con la membrana celular a trav&eacute;s de su dominio C&#150;terminal de uni&oacute;n a glicoprote&iacute;nas de membrana. La filamina mantiene la citoarquitectura plaquetaria y es esencial para el movimiento y cambio de formas celulares que suceden durante la activaci&oacute;n plaquetaria. Estudios previos han mostrado que una gran variedad de prote&iacute;nas con distintas funciones tales como traducci&oacute;n de se&ntilde;ales, regulaci&oacute;n de la transcripci&oacute;n de genes y movilizaci&oacute;n de receptores se asocian a la filamina, sugiriendo que &eacute;sta puede actuar como andamiaje u organizador de prote&iacute;nas. El prop&oacute;sito de esta comunicaci&oacute;n es el de describir brevemente las caracter&iacute;sticas de las macromol&eacute;culas asociadas a la FLNa plaquetaria y discutir un posible papel de la asociaci&oacute;n de &eacute;stas a la filamina.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Activaci&oacute;n plaquetaria. Citoesqueleto. Filamina A. Plaquetas. Receptor de von Willebrand. Integrina llb/llla.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2">Activation of cellular receptors by diverse stimuli induces dramatic changes in shape and function to respond to the new circumstances of the cell. This modified behavior depends on the reorganization of the peripheral actin meshwork. An outstanding example of these processes can be found in platelets, from which much of the information available on cytoskeletal function has been obtained. Among the many actin&#150;crosslinking proteins like spectrin, fimbrin or alpha actinin, filamin a (FLNa) emerges as the one with the highest potential in initiating the polimerization of actin filaments (F&#150;actin) during the formation of tridimensional actin gels. FLNa also links actin filaments to the cytosolic domain of many membrane glycoproteins in platelets through its C&#150;terminal region. In addition to participating in cell shape changes, FLNa is a scaffoldding protein that recruits numerous proteins involved in a completely different set of functions, including signal transduction, gene transcription regulation, and receptor translocation; however, the physiological role of FLNa in these processes has remained elusive. The purpose of the present communication is to briefly describe the characteristics of the macromolecules able to interact with FLNa and to discuss a possible role of FLNa during the transduction of signals from those molecular elements in platelets.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>llb/llla Integrin. Cytoskeleton. Filamin A. Platelets. Platelet activation, von Willebrand receptor.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Las actividades del citoesqueleto dependen de tres tipos de filamentos, a saber: a) filamentos de actina (microfilamentos), formados por mon&oacute;meros de actina y prote&iacute;nas accesorias entrecruzadoras de actina, entre las que destaca la filamina, b) microt&uacute;bulos formados por tubulina y prote&iacute;nas accesorias a &eacute;sta, como la prote&iacute;na tau y c) filamentos intermedios que incluyen prote&iacute;nas como la vimentina o la laminina. Cada uno de estos sistemas regula actividades fundamentales para la c&eacute;lula.</font></p>     <p align="justify"><font face="verdana" size="2">La reorganizaci&oacute;n tridimensional del citoesqueleto de actina permite varias funciones celulares tales como: cambios de forma, movimiento celular, divisi&oacute;n celular, fagocitosis y otros procesos que involucran un cambio celular en respuesta a est&iacute;mulos externos. Los microfilamentos son pol&iacute;meros del mon&oacute;mero de actina, subunidad proteica de 43 KDa denominada actina globular o actina G. Los filamentos de actina crecen por la adici&oacute;n de actina G en sus extremos, formando la actina filamentosa o actina F. <i>In vitro, </i>la actina G unida a ATP polimeriza en presencia de K<sup>+</sup> y Mg<sup>2</sup>. La eventual hidr&oacute;lisis de ATP para generar ADP hace a los filamentos inestables y susceptibles de reorganizaci&oacute;n al generar de nueva cuenta los mon&oacute;meros originales.<sup>1</sup> La importancia de la funcionalidad de los microfilamentos reside en la variabilidad de prote&iacute;nas asociadas a ellos, <i><a href="/img/revistas/acm/v76s4/a7t1.jpg" target="_blank">(Tabla I)</a>.<sup>1,2</sup> </i>Dentro de las prote&iacute;nas asociadas a actina est&aacute; la filamina, filamina no muscular o FLNa (ABP, ABP&#150;280 KDa o "Actin&#150;Binding Protein") que es una fosfoprote&iacute;na homodim&eacute;rica, que entrecruza los filamentos de actina en una malla tridimensional citos&oacute;lica. La filamina es la prote&iacute;na m&aacute;s eficiente en iniciar la gelaci&oacute;n de la F&#150;actina, adem&aacute;s de que une al citoesqueleto perif&eacute;rico de actina con la membrana celular a trav&eacute;s de su dominio C&#150;terminal de uni&oacute;n a glicoprote&iacute;nas (GP), como el receptor del factor von Willebrand Gplb&#150;V&#150;IX o el receptor de fibrin&oacute;geno, GP Ilb/IIIa.<sup>3&#150;5</sup> En esta comunicaci&oacute;n se describe la funci&oacute;n de cada una de las prote&iacute;nas asociadas a los filamentos de actina a trav&eacute;s de la filamina. As&iacute; mismo, discutimos el posible papel de la filamina durante la se&ntilde;alizaci&oacute;n iniciada por las mol&eacute;culas accesorias a &eacute;sta.</font></p>     <p align="justify"><font face="verdana" size="2">La filamina tiene una amplia distribuci&oacute;n filogen&eacute;tica. La secuencia completa de nucle&oacute;tidos de filamina obtenida de una genoteca derivada de c&eacute;lulas endoteliales (cADN de ABP) predice que cada subunidad de 280 KDa est&aacute; constituida por 2,647 amino&aacute;cidos. Los dominios funcionales de cada subunidad incluyen una regi&oacute;n N&#150;terminal (estructura alfa h&eacute;lice), de uni&oacute;n a actina F, tambi&eacute;n conocida como ABD ("Actin&#150;Binding&#150;Domain") de homolog&iacute;a con calponinas y con prote&iacute;nas presentes en v&iacute;as de transducci&oacute;n de se&ntilde;ales como Vav y IQGAP. Estudios recientes sugieren que la uni&oacute;n de ABD a actina es regulada por Calcio/Calmodulina. Tambi&eacute;n tiene un dominio C&#150;terminal de autouni&oacute;n y de uni&oacute;n a glicoprote&iacute;nas de membrana.<sup>6</sup> El resto de la prote&iacute;na est&aacute; constituida por 24 repetidas de 96 amino&aacute;cidos cada una en estructura beta plegada antiparalela. La filamina tiene dos sitios suceptibles a prote&oacute;lisis por calpa&iacute;na entre las repetidas 23 y 24 y un fragmento adicional entre las repetidas 15 y 16, generando un fragmento N&#150;terminal de 180 KDa, y un fragmento C&#150;terminal de 100 KDa que por acci&oacute;n prolongada de la calpa&iacute;na puede originar un fragmento de 90 KDa y un p&eacute;ptido C&#150;terminal de 10 KDa<sup>3,6 </sup><i><a href="#f1">(Fig. 1)</a>.</i></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a7f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Cuando la secuencia completa de nucle&oacute;tidos de la filamina fue deducida, el an&aacute;lisis de la secuencia deducida de amino&aacute;cidos permiti&oacute; predecir la existencia de m&uacute;ltiples sitios potenciales de fosforilaci&oacute;n para diversas cinasas: tres sitos para prote&iacute;na cinasa dependiente de AMP c&iacute;clico (PKA), treinta y tres sitios para prote&iacute;na cinasa C (PKC), treinta sitios para case&iacute;na cinasa II (CCII), e inclusive unos sitios para tirosina cinasa (YC). De hecho existen m&aacute;s de 380 residuos de serina/treonina en la filamina.</font></p>     <p align="justify"><font face="verdana" size="2">Hay tres isoformas de filamina en mam&iacute;feros A, B y C. La filamina A se encuentra ampliamente distribuida en c&eacute;lulas no musculares, por ejemplo plaquetas y c&eacute;lulas endoteliales.<sup>7</sup> La filamina B se encuentra principalmente en c&eacute;lulas musculares y la filamina C, se encuentra en m&uacute;sculo esquel&eacute;tico y card&iacute;aco en la edad adulta.<sup>8</sup> La localization en el genoma de los tres genes de filamina es altamente conservada. Los tres isotipos de filamina muestran entre s&iacute; 60% &#150; 80% de homolog&iacute;a en las secuencias completas, con excepci&oacute;n de las dos regiones bisagra, susceptibles a corte por calpa&iacute;na, las cuales muestran grandes divergencias.<sup>4,6,7</sup></font></p>     <p align="justify"><font face="verdana" size="2">La estructura de los d&iacute;meros de filamina es similar a una inmunoglobulina, su estructura flexible puede inducir ramificaciones ortogonales de actina&#150;F de gran &aacute;ngulo. Los &aacute;ngulos formados entre los mon&oacute;meros de filamina son inversamente proporcionales a la concentraci&oacute;n de filamina en plaquetas.<sup>4</sup> La formaci&oacute;n de ases paralelos de filamentos de actina es promovida cuando la proporci&oacute;n molar de filamina a actina es 1:10&#150;50, mientras que una estequiometr&iacute;a de 1:150&#150;740 lleva a la formaci&oacute;n de redes ortogonales de actina. Existen varios tipos de entrecruzamiento de la actina causados por la filamina (tipos X, T o Y).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Papel del citoesqueleto de actina y de la filamina en la plaqueta</b></font></p>     <p align="justify"><font face="verdana" size="2">Las plaquetas son estructuras celulares anucleadas que se forman en la megacariocitopoyesis a nivel de la m&eacute;dula &oacute;sea, por fragmentaci&oacute;n de la membrana plasm&aacute;tica de los megacariocitos, para posteriormente distribuirse por el torrente sangu&iacute;neo. El citoesqueleto de la plaqueta consiste en una red de estructuras filamentosas que mantienen la forma discoide de la plaqueta en reposo.<sup>9,10</sup> Incluyen filamentos de actina,<sup>11,12</sup> el anillo marginal de microt&uacute;bulos,<sup>13</sup> mol&eacute;culas de miosina<sup>14</sup> as&iacute; como mol&eacute;culas de uni&oacute;n a actina como filamina, espectrina, vinculina, talina, tropomiosina entre otras, todos ellos formando el esqueleto membranal y citopl&aacute;smico plaquetario <i><a href="#f2">(Fig. 2)</a>. </i>Por otro lado, el citoesqueleto tiene el papel de dirigir y promover los r&aacute;pidos cambios de forma inducidos por la activaci&oacute;n plaquetaria.<sup>15</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a7f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Los procesos de adhesi&oacute;n y activaci&oacute;n plaquetaria cumplen un papel fisiol&oacute;gico esencial en la formaci&oacute;n del co&aacute;gulo ante un da&ntilde;o tisular. Tambi&eacute;n constituyen un elemento central durante eventos patol&oacute;gicos tromboemb&oacute;licos y todo esto se inicia despu&eacute;s de la uni&oacute;n de receptores de superficie espec&iacute;ficos hacia componentes tales como la col&aacute;gena, trombina, vWF y ADP.<sup>14</sup> Cuando las plaquetas se activan ocurre una r&aacute;pida polimerizaci&oacute;n de filamentos de actina que determina el cambio de forma discoide a la forma extendida que involucra la formaci&oacute;n de estructuras denominadas filopodia y lamelipodia. La secreci&oacute;n del contenido granular, as&iacute; como la expresi&oacute;n de substancias procoagulantes en la superficie plaquetaria que conducen a la agregaci&oacute;n para la formaci&oacute;n de un co&aacute;gulo son eventos paralelos y sin&eacute;rgicos.<sup>16&#150;20</sup> Los cambios inducidos por la activaci&oacute;n plaquetaria resultan de procesos como la fosforilaci&oacute;n/defosforilaci&oacute;n y ruptura proteol&iacute;tica por calpa&iacute;na de prote&iacute;nas del citoesqueleto. La reorganizaci&oacute;n espec&iacute;fica depende de la combinaci&oacute;n de se&ntilde;ales a las que la plaqueta est&aacute; expuesta. De esta manera los cambios antes mencionados van acompa&ntilde;ados de la activaci&oacute;n de diversas familias de prote&iacute;nas cinasas y la subsecuente fosforilaci&oacute;n de un gran n&uacute;mero de prote&iacute;nas. A este respecto estudios han mostrado que el citoesqueleto es un blanco principal de estas enzimas.<sup>21</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Regulaci&oacute;n de la filamina por fosforilaci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Como ya se mencion&oacute;, la FLNa es una fosfoprote&iacute;na. A este respecto, estudios previos mostraron que la FLNa, aislada de plaquetas humanas, es una mezcla de formas fosforiladas en distinto grado desde 18 hasta 40 moles de fosfato/mol de mon&oacute;mero de ABP.<sup>21,22</sup> De hecho, se ha demostrado que la fosforilaci&oacute;n/defosforilaci&oacute;n de la filamina es un evento importante, involucrado en la reorganizaci&oacute;n del citoesqueleto de actina durante la activaci&oacute;n plaquetaria.<sup>21</sup> Este proceso no s&oacute;lo modula la habilidad de la filamina de entrecruzar filamentos de actina sino que tambi&eacute;n, al ser fosforilada por la cinasa dependiente de AMPc (PKA) disminuye la susceptibilidad de &eacute;sta a la degradaci&oacute;n por calpa&iacute;na,<sup>22</sup> una ciste&iacute;n proteasa dependiente de calcio cuya actividad da cuenta de m&aacute;s del 95% de la actividad total proteol&iacute;tica de la plaqueta y cuya presencia tambi&eacute;n ha sido demostrada en una gran diversidad de tejidos, incluyendo el endotelio.<sup>23&#150;26</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Interacci&oacute;n de la filamina con otras prote&iacute;nas</b></font></p>     <p align="justify"><font face="verdana" size="2">En los &uacute;ltimos a&ntilde;os, se ha encontrado que una amplia variedad de prote&iacute;nas se une a la filamina (m&aacute;s de 20 hasta la fecha), incluyendo receptores transmembranales y mol&eacute;culas de se&ntilde;alizaci&oacute;n <i><a href="/img/revistas/acm/v76s4/a7f3.jpg" target="_blank">(Fig. 3)</a> </i>y la mayor&iacute;a de &eacute;stas interaccionan con el extremo C&#150;terminal de la filamina.<sup>27</sup></font></p>     <p align="justify"><font face="verdana" size="2">De esta manera, la filamina, al unir una gran variedad de mol&eacute;culas tendr&iacute;a un papel fundamental, no &uacute;nicamente como estructuradora del citoesqueleto, sino tambi&eacute;n como mol&eacute;cula mediadora de se&ntilde;ales a partir de los cambios o rearreglos generados en la malla de actina en respuesta a diversos est&iacute;mulos. En la <i><a href="/img/revistas/acm/v76s4/a7t2.jpg" target="_blank">Tabla II</a> </i>se muestran algunas de las principales mol&eacute;culas accesorias de la filamina y se resumen las principales caracter&iacute;sticas funcionales de ellas. En este punto, cabe mencionar que no se sabe hasta la fecha si los procesos de fosforilaci&oacute;n/defosforilaci&oacute;n reci&eacute;n mencionados de la FLNa y la subsecuente reorganizaci&oacute;n del citoesqueleto jueguen alg&uacute;n papel en la se&ntilde;alizaci&oacute;n derivada a partir de estas mol&eacute;culas accesorias. A continuaci&oacute;n describiremos brevemente algunas de las interacciones m&aacute;s importantes, que pueden jugar un papel principal en la funci&oacute;n plaquetaria, asimismo, expondremos un posible papel para la fosforilaci&oacute;n de la FLNa en este proceso.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recientemente se resolvi&oacute; la estructura cristalina del complejo FLNa&#150;integrinas &#946;.<sup>51</sup> Se determin&oacute; que la repetida 21 de la FLNa brindaba la interfase apropiada para unir a la prote&iacute;na con el dominio citopl&aacute;smico de la integrina.</font></p>     <p align="justify"><font face="verdana" size="2">Como se menciona m&aacute;s adelante, la determinaci&oacute;n de esta estructura brind&oacute; un marco conceptual para entender aspectos de la funci&oacute;n de las integrinas. En este momento cabe recordar, que la habilidad de los receptores de adhesi&oacute;n (integrinas) de transmitir se&ntilde;ales qu&iacute;micas y de fuerza mec&aacute;nica a trav&eacute;s de la membrana celular, depende, en &uacute;ltima instancia, de su interacci&oacute;n con el citoesqueleto subyacente. As&iacute;, previamente, se hab&iacute;a demostrado que el receptor GPIb&#150;V&#150;IX (receptor del factor vW) estaba vinculado a la malla perif&eacute;rica de actina a trav&eacute;s de su uni&oacute;n con la FLNa.<sup>52,53</sup> La interacci&oacute;n se da con el dominio citopl&aacute;smico de la glicoprote&iacute;na IB, en particular con la GP Iba. La glicoprote&iacute;na IB (GP Ib) es una glicoprote&iacute;na de la membrana plaquetaria compuesta de un heterod&iacute;mero, una cadena alfa y una cadena beta, unidas por puentes disulfuro. La Gplb funciona como receptor del factor von Willebrand (vWF) y es tambi&eacute;n el receptor de alta afinidad para trombina<sup>54</sup> <i><a href="#f4">(Fig. 4)</a>. </i>El complejo de receptores incluye la asociaci&oacute;n no covalente de las subunidades alfa y beta con las glicoprote&iacute;nas IX y V en plaquetas. La uni&oacute;n del complejo GP Ib&#150;IX&#150;V al vWF facilita la adhesi&oacute;n inicial plaquetaria al endotelio vascular despu&eacute;s del da&ntilde;o vascular, y tambi&eacute;n inicia eventos de se&ntilde;alizaci&oacute;n, activaci&oacute;n plaquetaria, trombosis y hemostasis. Varios polimorfismos y mutaciones se han descrito en el gen que codifica para la subunidad alfa de este receptor, algunos de ellos son la causa del s&iacute;ndrome de Bernard&#150;Soulier y plaquetas con el fenotipo patol&oacute;gico de von Willebrand.<sup>55</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a7f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Un dato fundamental que se encontr&oacute; con la resoluci&oacute;n del modelo at&oacute;mico de la interacci&oacute;n FLNa&#150;integrina fue que el sitio de uni&oacute;n de la FLNa a la integrina se traslapaba con el sitio de uni&oacute;n de la talina (otra prote&iacute;na entrecruzadora de actina) a la integrina. Es decir, la FLNa y la talina compet&iacute;an por su uni&oacute;n a la integrina. Datos previos hab&iacute;an demostrado que la talina era la principal prote&iacute;na encargada de iniciar la activaci&oacute;n de adentro hacia afuera ("inside&#150;out activation") del receptor Ilb/IIIa (&#945;IIb/&#946;3) del fibrin&oacute;geno a trav&eacute;s de su uni&oacute;n al dominio citopl&aacute;smico de la integrina &#946;3.<sup>56</sup> Como se recordar&aacute;, en plaquetas en reposo el receptor Ilb/IIIa es incapaz de unir fibrin&oacute;geno con afinidad elevada. Sin embargo, cuando las plaquetas son activadas por distintos agonistas como la trombina, el ADP, la epinefrina, el col&aacute;geno o endoper&oacute;xidos de prostaglandinas, la conformaci&oacute;n de la GPIIb/IIIa cambia observ&aacute;ndose una uni&oacute;n aumentada por el fibrin&oacute;geno.<sup>57</sup> A este fen&oacute;meno es al que se le llama activaci&oacute;n de adentro hacia afuera y depende de la preactivaci&oacute;n plaquetaria. Datos previos han mostrado que durante la activaci&oacute;n plaquetaria la FLNa es fragmentada por proteasa neutra dependiente de calcio (calpa&iacute;na)<sup>22,58,59</sup> y que los fragmentos producto de esta hidr&oacute;lisis pueden ser liberados de la membrana para participar en v&iacute;as de se&ntilde;alizaci&oacute;n corriente abajo.<sup>60</sup> Como se menciona enseguida, estos productos de degradaci&oacute;n pueden participar en eventos posteriores durante la agregaci&oacute;n plaquetaria y adem&aacute;s liberar&iacute;an a la integrina &#946; que ahora estar&iacute;a en posibilidad de ser activada por la talina; brindando una explicaci&oacute;n para el mecanismo molecular de activaci&oacute;n de adentro hacia fuera del receptor de fibrin&oacute;geno.</font></p>     <p align="justify"><font face="verdana" size="2">Como se mencion&oacute;, otro ejemplo en donde la FLNa puede jugar un papel principal en la v&iacute;a hemost&aacute;tica, mediada por su interacci&oacute;n con otras macromol&eacute;culas, es durante la agregaci&oacute;n plaquetaria, especialmente en la formaci&oacute;n de las protuberancias de la membrana plaquetaria (filopodia) que se observan durante la generaci&oacute;n y posterior retracci&oacute;n del co&aacute;gulo.<sup>15</sup> Estudios previos hab&iacute;an mostrado que la inhibici&oacute;n plaquetaria por agentes que elevan la concentraci&oacute;n de AMP c&iacute;clico (AMPc) tales como la prostaciclina proteg&iacute;an a la FLNa de la degradaci&oacute;n por calpa&iacute;na.<sup>22</sup> Esto permit&iacute;a mantener una red &iacute;ntegra de la malla perif&eacute;rica de actina evitando los cambios de forma y estructura propios de la activaci&oacute;n plaquetaria. Esta reducci&oacute;n de la susceptibilidad de la FLNa a calpa&iacute;na se daba como consecuencia de su fosforilaci&oacute;n por la Prote&iacute;na Cinasa dependiente de AMPc (PKA).</font></p>     <p align="justify"><font face="verdana" size="2">Estudios posteriores mostraron que la fosforilaci&oacute;n se efectuaba de manera espec&iacute;fica en la serina 2152 localizada en el extremo C&#150;terminal de la prote&iacute;na.<sup>58</sup> Contrario a estas observaciones, Vadlamudi et al encontraron subsecuentemente que la fosforilaci&oacute;n de este mismo residuo (Ser2152) por la Prote&iacute;na Cinasa 1 activada por p21 (Pak 1) iniciaba la reorganizaci&oacute;n de la red de actina, generando fen&oacute;menos din&aacute;micos en la membrana celular.<sup>61</sup> Ellos tambi&eacute;n encontraron una acci&oacute;n rec&iacute;proca entre Pak 1 y FLNa es decir, Pak 1 fosforilaba a la FLNa y la FLNa activaba a Pak 1. M&aacute;s recientemente, nosotros propusimos un modelo que pod&iacute;a resolver esta contradicci&oacute;n y que adem&aacute;s suger&iacute;a una funci&oacute;n nueva para la FLNa.<sup>60</sup> Como ya se ha mencionado, la activaci&oacute;n inicial de las plaquetas es capaz de inducir la hidr&oacute;lisis de la FLNa por calpa&iacute;na. La prote&oacute;lisis de la prote&iacute;na, a su vez, libera fragmentos de la FLNa desde sus sitios de anclaje en la membrana. Como se muestra en la <i><a href="/img/revistas/acm/v76s4/a7t2.jpg" target="_blank">Tabla II</a>, </i>la regi&oacute;n C&#150;terminal de la FLNa es capaz de unir prote&iacute;nas del grupo de las peque&ntilde;as GTPasas; en particular destaca la Cdc42.<sup>45</sup> En este caso la uni&oacute;n de la GTPasa con la FLNa es independiente de GTP y hasta la fecha no se ha encontrado ning&uacute;n efecto de Cdc42 sobre la FLNa. El modelo propuesto<sup>60</sup> asume que el fragmento de FLNa liberado de la membrana es capaz de transportar a la GTPasa hasta el dominio CRIB de Pakl, que es el sitio en donde Cdc42 se une a la cinasa cuando su actividad es estimulada por autofosforilaci&oacute;n.<sup>62</sup> Posteriormente, Pak 1 activado por el complejo FLNa fragmentada&#150;Cdc42 ser&iacute;a capaz de refosforilar a la FLNa que no fue digerida por la calpa&iacute;na durante la posterior formaci&oacute;n de filopodia durante la activaci&oacute;n plaquetaria.</font></p>     <p align="justify"><font face="verdana" size="2">En conclusi&oacute;n, podemos decir que a partir de su papel central como estructuradora de la malla de actina plaquetaria, la FLNa puede ejercer funciones fundamentales adicionales como integradora de v&iacute;as de se&ntilde;alizaci&oacute;n. Es capaz, de esta manera, de integrar se&ntilde;ales mec&aacute;nicas desde receptores de adhesi&oacute;n hacia el citoesqueleto como en el caso de la GP Ib&#150;IX&#150;V. Adem&aacute;s, posterior a la estimulaci&oacute;n por agonistas espec&iacute;ficos, genera productos de degradaci&oacute;n que por un lado permitir&iacute;an la activaci&oacute;n interna del receptor Ilb/IIIa de fibrin&oacute;geno y adem&aacute;s mediar&iacute;an eventos en rutas corriente abajo importantes para la generaci&oacute;n de fen&oacute;menos din&aacute;micos de la membrana fundamentales para la formaci&oacute;n y retracci&oacute;n del co&aacute;gulo. Queda como importante campo de investigaci&oacute;n resolver el papel que la FLNa pueda jugar en la se&ntilde;alizaci&oacute;n derivada de muchas de las otras macromol&eacute;culas accesorias a ella. As&iacute; como su participaci&oacute;n en otros sistemas celulares.<sup>63</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
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