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<front>
<journal-meta>
<journal-id>1561-2953</journal-id>
<journal-title><![CDATA[Revista Cubana de Endocrinología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Endocrinol]]></abbrev-journal-title>
<issn>1561-2953</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1561-29532016000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El órgano adiposo, un arcoiris de regulación metabólica y endocrina]]></article-title>
<article-title xml:lang="en"><![CDATA[Adipose organ, a metabolic and endocrine regulating rainbow]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Julio César]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[César Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz]]></surname>
<given-names><![CDATA[Laura Victoria]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Rivera]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Tecnológica de Pereira Facultad Ciencias de la Salud Grupo de Fisiología Celular y Aplicada]]></institution>
<addr-line><![CDATA[Risaralda ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>27</volume>
<numero>1</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1561-29532016000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1561-29532016000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1561-29532016000100010&amp;lng=en&amp;nrm=iso"></self-uri><kwd-group>
<kwd lng="es"><![CDATA[órgano adiposo]]></kwd>
<kwd lng="es"><![CDATA[adipositos]]></kwd>
<kwd lng="es"><![CDATA[adipocinas]]></kwd>
<kwd lng="en"><![CDATA[adipose organ]]></kwd>
<kwd lng="en"><![CDATA[adipocytes]]></kwd>
<kwd lng="en"><![CDATA[adipokines]]></kwd>
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</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><b>Rev Cubana Endocrinol. 2016;27(1)</b></font></p>     <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>REVISI&#211;N    BIBLIOGR&#193;FICA </b></font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="4">El    &#243;rgano adiposo, un arcoiris de regulaci&#243;n metab&#243;lica y endocrina</font></b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">Adipose    organ, a metabolic and endocrine regulating rainbow </font></b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Julio C&#233;sar    S&#225;nchez, C&#233;sar Ram&#243;n Romero, Laura Victoria Mu&#241;oz, Ricardo    Alonso Rivera</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Grupo de Fisiolog&#237;a    Celular y Aplicada. Facultad Ciencias de la Salud. Universidad Tecnol&#243;gica    de Pereira. Risaralda, Colombia.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>RESUMEN</b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Introducci&#243;n:</b>    el adipocito es una c&#233;lula multifuncional e interviene en la homeostasis    sist&#233;mica a trav&#233;s de la producci&#243;n de adipocinas. Con la presente    revisi&#243;n se pretende revisar el estado actual del conocimiento respecto    al tejido adiposo, y proponer la consolidaci&#243;n del concepto de &#243;rgano    adiposo.     <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Desarrollo:    </b> el tejido adiposo est&#225; constituido por diferentes tipos de adipocitos,    no solamente el blanco y pardo, sino tambi&#233;n el beige, el rosa y la c&#233;lula    estrellada hep&#225;tica; todos ellos, adem&#225;s, se integran funcionalmente    con c&#233;lulas no grasas. Este hecho permite la evoluci&#243;n hacia el concepto    de &#243;rgano adiposo, con funciones metab&#243;licas, endocrinas y regulatorias,    tanto a nivel sist&#233;mico como local en algunos &#243;rganos, como es el    caso del adipocito rosa en la gl&#225;ndula mamaria lactante, y de la c&#233;lula    estrellada en el h&#237;gado. Estas funciones se ejercen a trav&#233;s de la    producci&#243;n de una gran diversidad de adipocinas, con efectos autocrinos    y paracrinos complejos. La transdiferenciaci&#243;n entre diferentes tipos de    adipocitos permite entender la importancia de la integraci&#243;n de las funciones    en el &#243;rgano adiposo. La alteraci&#243;n de la homeostasis de estas c&#233;lulas    y el desequilibrio en la producci&#243;n de adipocinas que ocurre como resultado    de la obesidad, genera una debacle metab&#243;lica que conduce al s&#237;ndrome    metab&#243;lico.     <br>   <b>Conclusiones: </b> el concepto de &#243;rgano adiposo permite comprender    integralmente la funci&#243;n de los adipocitos en el contexto de la regulaci&#243;n    sist&#233;mica. La investigaci&#243;n sobre los diferentes tipos de adipocitos    &#8212;y sobre el funcionamiento del &#243;rgano adiposo en conjunto&#8212;    conducir&#225; a un mejor entendimiento de estos procesos, tanto a nivel fisiol&#243;gico,    como patol&#243;gico. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Palabras clave:</b>    &#243;rgano adiposo; adipositos; adipocinas. </font></p> <hr>     <p><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>     <p><b><font size="2" face="Verdana">Introduction:</font></b><font size="2" face="Verdana">    adipocyte is a multifunctional cell that intervenes in the systemic homeostasis    through the production of adipokines. The present review intended to revise    the present situation of the knowledge on the adipose tissue and to make proposals    for the consolidation of the concept of adipose organ.    <br>   <b>Development:</b> the adipose tissue is made up of different types of adipocytes,    not only the white and the brown but also the beige, the pink and the hepatic    stellate cell. All of them are functionally integrated with non-fatty cells.    This fact allows the evolution into the concept of adipose organ, with metabolic,    endocrine and regulatory functions both at the systemic and local levels in    some organs, as it happens in the rose adipocyte in the lactating mammary gland    and in the hepatic stellate cells. These functions are performed through the    production of a wide diversity of adipokines, with complex autocrine and paracrine    effects. The transdifferentiation of several types of adipocytes allows understanding    the importance of integrating these functions into the adipose organ. The alteration    of homeostasis in these cells and the imbalanced production of adipokines that    takes place as a result of obesity, generate metabolic chaos leading to metabolic    syndrome.    ]]></body>
<body><![CDATA[<br>   <b>Conclusions:</b> the concept of the adipose organ allows understanding in    a comprehensive way the function of adipocytes in the systemic regulation. This    research on the different types of adipocytes - and on the functioning of the    adipose organ as a whole - will lead to a better understanding of these processes    at both the physiological and pathological level.</font></p>     <p><font size="2" face="Verdana"><b>Keywords:</b> adipose organ; adipocytes; adipokines.</font>    <br> </p> <hr>     <p>&nbsp; </p>     <p>&nbsp; </p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">INTRODUCCI&#211;N    </font></b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hasta los a&#241;os    80s el tejido adiposo (TA) era considerado tan solo un reservorio de energ&#237;a,    pero esta perspectiva ha venido cambiando, en la medida en que la evidencia    ha demostrado el importante papel que estas c&#233;lulas cumplen en el metabolismo    general y en la regulaci&#243;n de la funci&#243;n de diversos ejes endocrinos.<sup>1</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Posterior a la    identificaci&#243;n de la leptina, el adipocito es reconocido como una c&#233;lula    multifuncional,<sup>1</sup> productora de sustancias bioactivas denominadas    adipocinas. Las adipocinas intervienen en las funciones de otros &#243;rganos    y tejidos, regulan la secreci&#243;n de hormonas y participan en procesos tan    complejos como la regulaci&#243;n t&#233;rmica, la homeostasis de carbohidratos    y l&#237;pidos y, por ende, la regulaci&#243;n metab&#243;lica general.<sup>2</sup>    Su relevancia es a&#250;n mayor si se considera que estas c&#233;lulas son protagonistas    en el complejo proceso de la obesidad y el s&#237;ndrome metab&#243;lico (SM).<sup>3</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La presente revisi&#243;n    tiene como objetivo presentar una visi&#243;n actualizada de la fisiolog&#237;a    de los adipocitos y del concepto de &#243;rgano adiposo, dada la significancia    de este tejido en el proceso fisiopatol&#243;gico de diversas enfermedades de    alto impacto. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La b&#250;squeda    de la informaci&#243;n se realiz&#243; mediante consulta de recursos bibliogr&#225;ficos,    como las bases de datos <i>ScienceDirect, Scielo, Medline </i>y <i>Pubmed</i>,    utilizando diferentes combinaciones de los descriptores siguientes en ingl&#233;s:    <i> adiposetissue, adipocytes, brownadipocytes, whiteadipocytes, beige adipocytes,    pinkadipocytes, stellatecells, itocells, adipokines, leptin, resistin, adiponectin.    </i> Se revisaron todos los art&#237;culos que pudieron ser recuperados completos,    publicados entre 1980 y 2015, y se seleccionaron aquellos considerados relevantes.    </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">DESARROLLO</font></b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El TA tiene origen    y desarrollo mesod&#233;rmico.<sup>4</sup> Existen dos: blanco (TAB) o pardo    (TAP), de acuerdo con el tipo de adipocito predominante; el tercer tipo, son    los beige (ABg) o <i>brite</i> (t&#233;rmino que mezcla las palabras inglesas    <i>brown</i> y <i>white</i>, dado que se consideran c&#233;lulas que comparten    ciertas caracter&#237;sticas con ambos), encontrados en el TAB en cantidades    menores. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los adipocitos    rosa (AR) y las c&#233;lulas estrelladas hep&#225;ticas (CEH), son tipos especiales    que hacen parte de un tejido, en el cual no predominan como tipo celular (gl&#225;ndula    mamaria e h&#237;gado respectivamente) (<a href="#fig">Fig.</a>). </font></p>     <p align="center"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><a name="fig"></a>    <img src="/img/revistas/end/v27n1/f0110116.jpg" width="581" height="536"> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Adem&#225;s de    los adipocitos, tambi&#233;n se encuentran coexistiendo con ellos sus c&#233;lulas    precursoras, los preadipocitos, en distintos grados de diferenciaci&#243;n.    Adicionalmente, tanto en TAB como en TAP, se encuentran en cantidades importantes    diferentes tipos de c&#233;lulas no grasas, tales como, c&#233;lulas sangu&#237;neas,    c&#233;lulas endoteliales, pericitos, fibroblastos, macr&#243;fagos y otras    c&#233;lulas del sistema inmune, integradas funcionalmente con los adipositos.<sup>5</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En humanos, el    TAB se encuentra distribuido a nivel visceral en diferentes dep&#243;sitos grasos    (mediast&#237;nico, omental, mesent&#233;rico, perigonadal, perirrenal y retroperitoneal),    y a nivel subcut&#225;neo en forma generalizada. El TAP, en cambio, se encuentra    en regiones anat&#243;micas particulares (peritiroidea, interescapular, supraclavicular    y alrededor de algunos &#243;rganos, como los ri&#241;ones y las gl&#225;ndulas    suprarenales). Existen diferencias funcionales notables entre los diferentes    tipos de adipocitos, aunque el origen celular pueda ser compartido o exista    interconversi&#243;n entre algunos de los subtipos (<a href="#fig">Fig.</a>).    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>    <br>   Adipocito blanco (AB)</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El AB maduro se    caracteriza por tener forma esf&#233;rica, di&#225;metros muy variables, y una    &#250;nica y voluminosa vacuola grasa que constituye m&#225;s del 90 % de su    volumen total (uniloculares).<sup>3</sup> Su origen es mesod&#233;rmico. Posee    una gran plasticidad estructural, pues el volumen de su vacuola grasa puede    incrementarse o disminuir, dependiendo del estado funcional.<sup>6</sup> Es    el principal efector de los procesos de lipog&#233;nesis y lip&#243;lisis, regulados    por diversos agentes hormonales y bajo la influencia de otros &#243;rganos y    sistemas.<sup>7</sup> </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El AB es tambi&#233;n    es el m&#225;s importante productor de leptina, hormona reguladora de la producci&#243;n    de otras adipocinas en forma autocrina. A trav&#233;s de la leptina los ABs    intervienen en la regulaci&#243;n de todos los ejes hormonales del organismo    y en una multiplicidad de funciones, que van desde la regulaci&#243;n del apetito,    hasta la regulaci&#243;n de la respuesta inmune. En la obesidad hay una sobreproducci&#243;n    de esta hormona por parte de un TAB hipertr&#243;fico, que ocasiona la debacle    metab&#243;lica caracter&#237;stica de esta enfermedad, y que lleva al SM, un    grave problema de salud p&#250;blica.<sup>8,9</sup> La leptina producida por    los ABs estimula la s&#237;ntesis de resistina, cuya principal fuente son los    macr&#243;fagos del TAB,<sup>10</sup> e inhibe la de adiponectina en forma autocrina,    y as&#237; empeora el desequilibrio metab&#243;lico en el SM. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Adem&#225;s, la    proliferaci&#243;n de ABs se relaciona con la disminuci&#243;n de APs,<sup>11</sup>    fuente de adiponectina. La leptina promueve la producci&#243;n de otros factores    proinflamatorios, tales como, la misma resistina, el factor de necrosis tumoral    alfa (FNT&#945;) y la interleucina 6 (IL-6),<sup>12</sup> factores inductores    del estado de inflamaci&#243;n cr&#243;nica sist&#233;mica que se encuentra    en la obesidad. Los ABs tambi&#233;n son productores de varias mol&#233;culas    relacionadas con la cascada del complemento, como la <i>acylationstimulatingprote&#237;na</i>    (ASP), incrementada en sujetos obesos, y promotora del almacenamiento de triglic&#233;ridos    por medio de la estimulaci&#243;n del transporte de glucosa, la inhibici&#243;n    de la lip&#243;lisis y el aumento de la reesterificaci&#243;n de &#225;cidos    grasos.<sup>13</sup> La adipsina, tambi&#233;n conocida como factor D, otra    prote&#237;na relacionada con el complemento, tambi&#233;n es producida por    los ABs; en humanos aumenta su expresi&#243;n en la obesidad, mientras que en    el ayuno, la caquexia y la lipodistrofia, disminuyen sus concentraciones.<sup>14</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La visfatina,    otra de las adipocinas producidas por los ABs, se incrementa en pacientes con    SM,<sup>15</sup> y ha sido postulada como un marcador de aterog&#233;nesis;<sup>16</sup>    sin embargo, en pacientes con obesidad de larga data e hiperleptinemia, sus    niveles se encuentran disminuidos.<sup>17</sup> Esta adipocina puede tener efectos    hipoglucemiantes ejercidos por medio del mismo receptor de la insulina, pero    uni&#233;ndose a este en un sitio diferente;<sup>18</sup> tambi&#233;n posee    efectos vasodilatadores mediados por la v&#237;a del &#243;xido n&#237;trico,<sup>19</sup>    genera agregaci&#243;n leucocitaria, y tiene efectos angiog&#233;nicos y proinflamatorios    directos, y por ende, puede generar disfunci&#243;n endotelial.<sup>20 </sup>Los    ABs periviscerales producen tambi&#233;n la omentina, la cual incrementa la    sensibilidad a la insulina,<sup>21</sup> inhibe la producci&#243;n de FNT&#945;    y posee efectos antiinflamatorios y cardioprotectores;<sup>22</sup> su producci&#243;n    se disminuye en pacientes con SM y diabetes mellitus tipo 2 (DM 2).<sup>23,24</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>    <br>   Adipocito pardo (AP)</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En contraste con    el AB, el AP posee varias vacuolas peque&#241;as de l&#237;pidos (multilocular),    y tiene cantidades mayores de mitocondrias y de gr&#225;nulos de gluc&#243;geno.<sup>25</sup>    Se caracterizan tambi&#233;n por expresar las prote&#237;nas <i>uncoupledprotein    1 </i>(UCP-1), no expresadas por los AB.<sup>26</sup> En humanos estas c&#233;lulas    son m&#225;s abundantes en fetos y reci&#233;n nacidos, y su cantidad disminuye    gradualmente hacia la adultez, dependiendo de la exposici&#243;n al fr&#237;o    y el ejercicio.<sup>27</sup> Su principal funci&#243;n es la termog&#233;nesis,    proceso de elevada eficiencia pues genera unos 300 vatios por kilogramo (w/kg),    en contraste con otros tejidos que producen tan solo 1 w/kg.<sup>28</sup> Su    origen es tambi&#233;n mesod&#233;rmico, pero independiente del AB,<sup>29</sup>    pues se origina en c&#233;lulas <i>Myogenic Factor 5+ </i>(Myf5+).<sup>30 </sup>Hasta    hace poco tiempo se asum&#237;a que la presencia de AP solo era significativa    en fetos y reci&#233;n nacidos, pero diversos estudios han demostrado su presencia    en adultos;<sup>31</sup> sin embargo, su papel en la homeostasis t&#233;rmica    tiende a disminuir a medida que aumenta la edad y el &#237;ndice de masa corporal    (IMC), o se desarrollan enfermedades como DM o SM.<sup>32 </sup>El papel de    este tejido como regulador de la termog&#233;nesis se debe a la presencia de    gran cantidad de mitocondrias y en su membrana interna, de las prote&#237;nas    UCP-1,<sup>33</sup> transportadores que permiten la translocaci&#243;n de protones    hacia la matriz mitocondrial, aumentando la actividad de la cadena respiratoria,    y por ende, la producci&#243;n de energ&#237;a, parte de la cual es disipada    en forma de calor.<sup>34 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Otras prote&#237;nas    producidas por el AP, tambi&#233;n involucradas en el proceso de termog&#233;nesis,    son la deiodinasa tipo II (D2) de la tetrayodotironina (T<sub>4</sub>), reguladora    de la tasa metab&#243;lica basal e inducible por la exposici&#243;n al fr&#237;o,<sup>35</sup>    y la prote&#237;na 1&#945; activadora del receptor activado por el proliferador    de peroxisomas (PGC1-&#945;), cuya s&#237;ntesis tambi&#233;n es inducida por    bajas temperaturas, y es fundamental para promover la expresi&#243;n dereceptores    activados por proliferadores de peroxisomas &#947; y&#945; (PPAR&#947; y &#945;),<sup>36</sup>    y el dominio que contiene la prote&#237;na 16(PRDM16), prote&#237;na que promueve    la diferenciaci&#243;n hacia APs.<sup>30,37</sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El AP produce    adiponectina, hormona que aumenta la sensibilidad a la insulina en m&#250;sculos,    h&#237;gado y otros &#243;rganos, adem&#225;s de favorecer la oxidaci&#243;n    de &#225;cidos grasos.<sup>38</sup> No obstante, la adiponectina puede reducir    la producci&#243;n de UCP-1 en APs, y disminuir as&#237; su potencial termog&#233;nico.<sup>39</sup>    Los APs tambi&#233;n producen factor de crecimiento fibrobl&#225;stico (FGF,    <i>fibroblastgrowth factor</i>), particularmente los subtipos 16, 19 y 21.<sup>40    </sup>El FGF19 es un activador de la tasa metab&#243;lica y sensibilizador para    la insulina. En ratones transg&#233;nicos, FGF19+ se favorece el crecimiento    de TAP;<sup>41</sup> el FGF16 es promotor mitog&#233;nico del TAP en las primeras    etapas embrionarias,<sup>42</sup> y el FGF21 activa varios genes relacionados    con la termog&#233;nesis en roedores, que se asocian con activaci&#243;n de    los receptores &#946; adren&#233;rgicos y el incremento en la producci&#243;n    de UCP-1 en el mismo tejido a trav&#233;s de un efecto autocrino.<sup>43,44</sup>    El FGF21, por su parte, activa la termog&#233;nesis y la lip&#243;lisis directamente,    y aumenta la producci&#243;n de adiponectina en APs humanos.<sup>45</sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>    <br>   Adipocito beige (ABg)</b> </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Este tipo de adipocito    se desarrolla en lo que com&#250;nmente se conoce como el proceso de &#8220;pardeamiento&#8221;    (<i>browning</i>) o reclutamiento de APs en el TAB, a partir de ABs(transdiferenciaci&#243;n),    por exposici&#243;n a temperaturas bajas, o estimulaci&#243;n de receptores    &#946;<sub>3</sub> adren&#233;rgicos.<sup>46</sup> Los ABgs tambi&#233;n presentan    vacuolas lip&#237;dicas m&#250;ltiples, pero en menor cantidad que los APs (pauciloculares);    estas c&#233;lulas tambi&#233;n son capaces de expresar UCP-1.<sup>47</sup>    Se desarrollan en el TAB, principalmente en la regi&#243;n inguinal.<sup>26</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los ABgs son tambi&#233;n    de origen mesod&#233;rmico, y presentan caracter&#237;sticas comunes con los    APs. No obstante, se ha demostrado que poseen or&#237;genes distintos, ya que    los ABgs son derivados de c&#233;lulas <i>Myogenic Factor 5- </i>(Myf-5-) y    comparten un ancestro com&#250;n con los ABs;<sup>48</sup> no obstante, representan    un linaje diferente a estos.<sup>49</sup> El t&#233;rmino &#8220;<i>brite</i>&#8221;    ha sido acu&#241;ado para denominar estos adipocitos que parecen proceder de    los ABs, pero que adquieren caracter&#237;sticas similares a los APs.<sup>47</sup>    La inducci&#243;n de esta transdiferenciaci&#243;n representa una estrategia    terap&#233;utica potencial para el tratamiento de la obesidad,<sup>50</sup>    dado que los ABg o &#8220;<i>brite</i>&#8221; son tambi&#233;n termog&#233;nicos    y productores de adiponectina.<sup>51</sup> Adicionalmente los ABgs producen    FGF21,<sup>52</sup> factor optimizador del consumo de ox&#237;geno y favorecedor    de la termog&#233;nesis. La leptina del AB, hallada tambi&#233;n en cantidades    menores en los ABgs, inhibe la transdiferenciaci&#243;n del AB al ABg. Los ABgs    tambi&#233;n son productores de quimerina, la cual tambi&#233;n es inducida    por el fr&#237;o en ratones y favorece la termog&#233;nesis.<sup>53 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>    <br>   Adipocito rosa (AR)</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El AR es una c&#233;lula    secretora de leche, y fue denominado de esta forma en referencia a su existencia    exclusiva en gl&#225;ndulas mamarias lactantes de los mam&#237;feros hembras,    y a la coloraci&#243;n rosada de estos &#243;rganos con tinciones comunes.<sup>54</sup>    Cumplen con la definici&#243;n de adipocitos porque pueden almacenar grandes    cantidades de grasa, son productores de adipocinas y est&#225;n sometidos a    regulaci&#243;n funcional por estas. Existe evidencia que sugiere que se originan    por transdiferenciaci&#243;n de los ABs.<sup>55</sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En condiciones    fisiol&#243;gicas basales, el TAB ocupa 90 % del volumen de las mamas; durante    el embarazo y la lactancia, los cambios hormonales promueven la expresi&#243;n    de PPAR&#947;,<sup>56</sup> e inducen un incremento del par&#233;nquima glandular,    incluyendo a los AR, en reemplazo del TAB. Los AR son considerados un reservorio    graso que sirve de sustrato a la producci&#243;n de leche;<sup>54,57 </sup>y    al terminar la lactancia, se reinicia el proceso de formaci&#243;n de nuevo    TAB y la gl&#225;ndula mamaria vuelve a su estado basal.<sup>55</sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los AR son productores    de leptina,<sup>58</sup> hormona promotora de la proliferaci&#243;n del epitelio    mamario, y preventiva de la obesidad en las cr&#237;as.<sup>59</sup> Tambi&#233;n    expresan la prote&#237;na S100b, que promueve la maduraci&#243;n del sistema    nervioso central del neonato, es vasodilatadora y tiene efectos proinflamatorios.<sup>60</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La perilipina    B, una fosfoprote&#237;na que regula la lip&#243;lisis en las vacuolas grasas,    se expresa abundantemente en los AR.<sup>61</sup> En pacientes con obesidad    act&#250;a impidiendo la lip&#243;lisis inducida por TNF&#945;, y sus niveles    bajos se relacionan con la presencia de otras prote&#237;nas como la lipoprote&#237;n    lipasa;<sup>62</sup> adicionalmente se transmite de la madre al neonato, por    la leche materna, para cumplir la misma funci&#243;n, por lo que adquiere un    papel importante en la hidr&#243;lisis de los l&#237;pidos l&#225;cteos.<sup>63</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>    <br>   C&#233;lula estrellada hep&#225;tica (CEH-&#191;adipocito azul?)</b> </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La CEH, tambi&#233;n    conocida como c&#233;lula de Ito, lipocito hep&#225;tico o c&#233;lula perisinusoidal,    tiene un origen embriol&#243;gico controversial, pero es m&#225;s probable que    su origen sea mesod&#233;rmico.<sup>64</sup> Uno de los aspectos m&#225;s relevantes    de las CEH es su capacidad para expresar un fenotipo dual. El primer fenotipo    es el quiescente, estado fisiol&#243;gico de estas c&#233;lulas, en el que poseen    m&#250;ltiples ves&#237;culas (multilocular) llenas de vitamina A y organelas    peque&#241;as; constituyen entre 5 y 8 % de todas las c&#233;lulas hep&#225;ticas.    Se encuentran localizados en el espacio de Disse, subyacentes a las c&#233;lulas    endoteliales; poseen un citoplasma alargado y prolongaciones que interact&#250;an    con endotelio, c&#233;lulas nerviosas, y hepatocitos. Estas c&#233;lulas tambi&#233;n    liberan mediadores extracelulares, y poseen funciones bien definidas en la regulaci&#243;n    de la homeostasis de la matriz extracelular.<sup>65 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El segundo fenotipo    es el llamado de activaci&#243;n, y se constituye en una c&#233;lula altamente    fibrog&#233;nica, como consecuencia de una estimulaci&#243;n paracrina a partir    de c&#233;lulas de Kupffer, hepatocitos y plaquetas, por una alteraci&#243;n    metab&#243;lica o inflamatoria.<sup>66</sup> Inicialmente su citoarquitectura    se transforma, pierde las ves&#237;culas grasas y se incrementa la producci&#243;n    de desmina, prote&#237;na &#225;cida fibrilar glial y algunas adipocinas; a    medida que la lesi&#243;n avanza hacia la cronicidad, su estructura se transforma    a miofibrilar, con una alta producci&#243;n de factor de crecimiento transformante    &#946; (TGF&#946;), FNT&#945; e IL-1&#945;, y adquisici&#243;n de capacidad    contr&#225;ctil y actividad proinflamatoria.<sup>65 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Todo lo anterior    finalmente genera una alteraci&#243;n estructural y funcional del h&#237;gado,    que desemboca en fibrosis hep&#225;tica, fen&#243;meno que es com&#250;n a una    serie de procesos inflamatorios secundarios a consumo de alcohol, obesidad extrema    o infecciones hep&#225;ticas. En el desarrollo de este proceso se da la intervenci&#243;n    de diferentes adipocinas, que establecen una comunicaci&#243;n cruzada entre    los hepatocitos, las CEHs y los macr&#243;fagos, alterando la homeostasis de    l&#237;pidos y generando resistencia a la insulina, as&#237; como una respuesta    inmunol&#243;gica aberrante, y finalmente fibrog&#233;nesis.<sup>67</sup> Este    fen&#243;meno est&#225; com&#250;nmente asociado a la obesidad y la hiperleptinemia,    pues la leptina se encarga de promover la activaci&#243;n de la CEH, al inhibir    la acci&#243;n protectora para el desarrollo de fibrosis de la prote&#237;na    ligadora de elementos reguladores de esterol 1c (SREBP-1c). En roedores, la    catenina &#946;, reguladora de la diferenciaci&#243;n de los adipocitos, inhibe    la s&#237;ntesis de leptina en CEHs y potencia la acci&#243;n protectora de    SREBP-1c.<sup>68</sup> Adicionalmente, la leptina producida por la CEH activada    altera la regulaci&#243;n de los niveles de glucosa del hepatocito.<sup>69</sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Otra adipocina    con efectos desde y hacia este tejido es la resistina, cuyos niveles s&#233;ricos    se encuentran elevados en la fase temprana de la esteatosis hep&#225;tica no    alcoh&#243;lica (EHNA), inicialmente en la CEH y luego a nivel sist&#233;mico.    Sus niveles de expresi&#243;n se correlacionan con el grado de esteatosis e    inflamaci&#243;n hep&#225;ticas.<sup>70</sup> Posee acci&#243;n proinflamatoria    a nivel hep&#225;tico, al estimular directamente la activaci&#243;n del factor    nuclear kappa &#946; y las IL-1 y 5,<sup>71</sup> y adem&#225;s una acci&#243;n    profibr&#243;tica, pues favorece la activaci&#243;n de la CEH.<sup>72 </sup>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La adiponectina    tambi&#233;n es expresada por las CEH en estado quiescente.<sup>73</sup> Esta    adipocina posee actividades antifibr&#243;ticas, pues disminuye los niveles    de marcadores como la &#945; actina de m&#250;sculo liso (&#945;-SMA), el factor    de crecimiento transformante 1&#946; (TGF-&#946;1) y el inhibidor tisular de    metaloproteinasa 1 (TIMP1), todos ellos marcadores de la fibrog&#233;nesis hep&#225;tica;<sup>74</sup>    la adiponectina tambi&#233;n inhibe la migraci&#243;n de las CEH, propiedad    que est&#225; en relaci&#243;n con su actividad fibrog&#233;nica,<sup>75</sup>    y antagoniza los efectos profibr&#243;ticos de la leptina en el h&#237;gado,    originados en la CEH.<sup>76 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La quemerina,    otra adipocina que se incrementa en pacientes obesos, es tambi&#233;n expresada    por las CEH, pero en mucha menor cantidad que en los hepatocitos.<sup>77 </sup>EL    FNT&#945;, en s&#237; mismo, tambi&#233;n ha sido implicado en el desarrollo    de EHNA. En modelos murinos el incremento de la producci&#243;n de esta citosina,    por parte de la CEH, promueve la fibrosis hep&#225;tica, al incrementar los    niveles de expresi&#243;n de col&#225;geno &#945;1, &#945;-SMA y TGF-&#946;1.<sup>78</sup>    Adicionalmente, hay evidencia del incremento de la producci&#243;n de visfatina    en la CEH activada, efecto estimulante de la expresi&#243;n de &#945;-SMA y    factor de crecimiento de tejido conectivo, as&#237; como de la producci&#243;n    de col&#225;geno tipos 1 y 3.<sup>79 </sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las respuestas    de las CEHs a diferentes adipocinas, y su potencial actividad proinflamatoria    y reguladora del metabolismo, permiten integrarlas al &#243;rgano adiposo como    un componente adicional, regulador de la funci&#243;n hep&#225;tica, que responde    ante est&#237;mulos sist&#233;micos. De acuerdo con la tendencia a denominar    los adipocitos con un color relacionado con su funci&#243;n y/o estructura,    a la CEH se le podr&#237;a asignar el azul, dada la coloraci&#243;n de la autofluorescencia,    emitida por las gotas lip&#237;dicas cuando estas c&#233;lulas son estimuladas    a 328 nm.<sup>64</sup> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> En la obesidad,    un estado que cursa con hiperleptinemia, hiperresistinemia y adiponectinemia,    se puede producir esteatosis, y posteriormente fibrosis hep&#225;tica, como    consecuencia de la regulaci&#243;n alterada ejercida por estas adipocina sobre    las CEHs, no solo por los efectos de las hormonas producidas desde los ABs o    APs, sino tambi&#233;n por las producidas localmente. </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">CONCLUSIONES</font></b>    </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El concepto de    TA ha ido evolucionando hacia el de &#243;rgano adiposo, en la medida en que    se han identificado diferentes tipos de adipocitos que se regulan mutuamente,    y que, en algunos casos, pueden transdiferenciarse entre s&#237;, dependiendo    de diversos factores. Estas c&#233;lulas, adem&#225;s, intervienen en la homeostasis    metab&#243;lica sist&#233;mica y, en algunos tejidos, como la gl&#225;ndula    mamaria y el h&#237;gado, logran un grado de especializaci&#243;n particular    para la regulaci&#243;n de funciones espec&#237;ficas. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Esta concepci&#243;n    de &#243;rgano adiposo permite entender la importancia de los adipocitos en    un contexto integral, y puede ayudar a comprender mejor los procesos fisiopatol&#243;gicos    en los cuales estas c&#233;lulas son protagonistas, en particular, la obesidad    y el SM. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La investigaci&#243;n    en torno a la fisiolog&#237;a de los diferentes tipos de adipocitos, las adipocinas    y los procesos regulatorios que permiten una funci&#243;n integrada de los diferentes    componentes del &#243;rgano adiposo, permite una mejor comprensi&#243;n de estos    procesos fisiol&#243;gicos y patol&#243;gicos, y abre mucho m&#225;s el panorama    alrededor de estas c&#233;lulas. </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">REFERENCIAS    BIBLIOGR&#193;FICAS</font></b> </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><a>1. 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Eur J Endocrinol. 2014;170(5):R159-71.     </font></p>     <p>&nbsp;</p>     <p>&nbsp; </p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Recibido: 12 de    mayo de 2015. <br/>   Aprobado: 10 de noviembre de 2015. </font></p>     <p>&nbsp;</p>     <p>&nbsp; </p>     ]]></body>
<body><![CDATA[ ]]></body>
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