<?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>0120-0011</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med.]]></abbrev-journal-title>
<issn>0120-0011</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-00112015000200012</article-id>
<article-id pub-id-type="doi">10.15446/revfacmed.v63n2.46195</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Vaciamiento gástrico y diabetes mellitus tipo 2]]></article-title>
<article-title xml:lang="en"><![CDATA[Gastric emptying and Type 2 diabetes mellitus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintero-Cadavid]]></surname>
<given-names><![CDATA[Camilo Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Otero-Regino]]></surname>
<given-names><![CDATA[William]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco-Vega]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bogotá D. C]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bogotá D. C]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Clínica Fundadores  ]]></institution>
<addr-line><![CDATA[Bogotá D. C]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<volume>63</volume>
<numero>2</numero>
<fpage>271</fpage>
<lpage>278</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-00112015000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-00112015000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-00112015000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El adecuado control de la diabetes mellitus tiene una gran importancia desde muchos puntos de vista. En los últimos años, se ha destacado el impacto que tienen los niveles de la glucemia postprandial sobre el manejo y las complicaciones de esta enfermedad. Controlar la hiperglucemia postprandial y, por lo tanto, su participación en el deterioro clínico de los pacientes con diabetes puede conseguirse retardando el vaciamiento gástrico y estimulando el efecto incretina, los cuales se pueden promover utilizando los análogos del péptido similar al glucagón tipo 1 (GLP-1). En este artículo se revisa el concepto del efecto incretina y la utilidad de los análogos GLP-1 en el control de la glicemia en los pacientes con diabetes mellitus tipo 2.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Proper control of diabetes mellitus is very important from many points of view. In recent years, the impact of postprandial blood glucose levels on the treatment and complications of this disease has been highlighted. Controlling postprandial hyperglycemia-and, therefore, its participation in the clinical deterioration of patients with diabetes-can be achieved by delaying gastric emptying and stimulating the incretin effect, which can be promoted using the analogues of glucagon-like peptide-1 (GLP-1). In this article, the concept of the incretin effect and usefulness of GLP-1 analogues for glycemic control in patients with type 2 diabetes mellitus is reviewed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diabetes mellitus Tipo 2]]></kwd>
<kwd lng="es"><![CDATA[Péptido 1 similar al glucagón]]></kwd>
<kwd lng="es"><![CDATA[Vaciamiento gástrico]]></kwd>
<kwd lng="es"><![CDATA[Incretinas]]></kwd>
<kwd lng="en"><![CDATA[Diabetes mellitus]]></kwd>
<kwd lng="en"><![CDATA[Type 2]]></kwd>
<kwd lng="en"><![CDATA[Glucagon-like peptide 1]]></kwd>
<kwd lng="en"><![CDATA[Gastric emptying]]></kwd>
<kwd lng="en"><![CDATA[Incretins]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p>DOI: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.46195" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.46195</a></p>     <p>INVESTIGACI&Oacute;N ORIGINAL</p>     <p align="center"><font size="4"><b>Vaciamiento g&aacute;strico y diabetes <I>mellitus</I> tipo 2</b></font></p>     <p align="center"><font size="3"><b><I>Gastric emptying and Type 2 diabetes mellitus</I></b></font></p>     <p align="center">Camilo Andr&eacute;s Quintero-Cadavid<Sup>1</Sup>, William Otero-Regino<Sup>2,3</Sup>, Roberto Franco-Vega<Sup>1</Sup></p>     <p><Sup>1</Sup> Unidad de Endocrinolog&iacute;a, Facultad de Medicina, Universidad Nacional de Colombia. Bogot&aacute; D. C., Colombia.    <br> <Sup>2</Sup> Unidad de Gastroenterolog&iacute;a, Facultad de Medicina, Universidad Nacional de Colombia. Bogot&aacute; D. C., Colombia.    <br> <Sup>3</Sup> Cl&iacute;nica Fundadores. Bogot&aacute; D. C., Colombia.</p>     <p>Correspondencia: Camilo Andr&eacute;s Quintero-Cadavid. Carrera 30 No. 45-03 Bloque 471. Bogot&aacute;, D. C., Colombia. Tel&eacute;fono: +57 1 3165000. Extensi&oacute;n: 15011. Facultad de Medicina, Universidad Nacional de Colombia. Bogot&aacute; D. C., Colombia. Correo electr&oacute;nico: <a href="mailto:caaquinteroca@unal.edu.co">caaquinteroca@unal.edu.co</a>.</p>     ]]></body>
<body><![CDATA[<p align="center">Recibido: 15/10/2014 Aceptado:16/02/2015</p> <hr>     <p><b>Resumen</b></p>      <p>El adecuado control de la diabetes mellitus tiene una gran importancia desde muchos puntos de vista. En los &uacute;ltimos a&ntilde;os, se ha destacado el impacto que tienen los niveles de la glucemia postprandial sobre el manejo y las complicaciones de esta enfermedad. Controlar la hiperglucemia postprandial y, por lo tanto, su participaci&oacute;n en el deterioro cl&iacute;nico de los pacientes con diabetes puede conseguirse retardando el vaciamiento g&aacute;strico y estimulando el efecto incretina, los cuales se pueden promover utilizando los an&aacute;logos del p&eacute;ptido similar al glucag&oacute;n tipo 1 (GLP-1). En este art&iacute;culo se revisa el concepto del efecto incretina y la utilidad de los an&aacute;logos GLP-1 en el control de la glicemia en los pacientes con diabetes mellitus tipo 2.</p>     <p><B>Palabras clave: </B>Diabetes <I>mellitus </I>Tipo 2; P&eacute;ptido 1 similar al glucag&oacute;n; Vaciamiento g&aacute;strico; Incretinas (DeCS).</p> <hr>     <p><B>Quintero-Cadavid CA, Otero-Regino W, Franco-Vega R.</B> Vaciamiento g&aacute;strico y diabetes <I>mellitus</I> tipo 2. Rev. Fac. Med. 2015;63(2):271-8. doi: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.46195" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.46195</a>.</p> <hr>     <p><b>Summary</b></p>      <p>Proper control of diabetes <I>mellitus</I> is very important from many points of view. In recent years, the impact of postprandial blood glucose levels on the treatment and complications of this disease has been highlighted. Controlling postprandial hyperglycemia&mdash;and, therefore, its participation in the clinical deterioration of patients with diabetes&mdash;can be achieved by delaying gastric emptying and stimulating the incretin effect, which can be promoted using the analogues of glucagon-like peptide-1 (GLP-1). In this article, the concept of the incretin effect and usefulness of GLP-1 analogues for glycemic control in patients with type 2 diabetes <I>mellitus</I> is reviewed.</p>     <p><B>Keywords: </B>Diabetes <I>mellitus</I>, Type 2; Glucagon-like peptide 1; Gastric emptying; Incretins (MeSH).</p> <hr>     <p><B>Quintero-Cadavid CA, Otero-Regino W, Franco-Vega R.</B> &#91;Gastric emptying and Type 2 diabetes <I>mellitus</I>&#93;. Rev. Fac. Med. 2015;63(2):271-8. Spanish. doi: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.46195" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.46195</a>.</p> <hr>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>      ]]></body>
<body><![CDATA[<p>La diabetes <I>mellitus</I> (DM) tiene un gran impacto en la poblaci&oacute;n mundial y nacional. El 8,3 % de la poblaci&oacute;n mundial (382 millones) padece esta entidad y para el a&ntilde;o 2035 se estima que afectar&aacute; al 10 % (592 millones) (1). En Colombia, alrededor de 2,13 millones de personas entre 20 y 79 a&ntilde;os tienen DM, representando el 7,12 % de la poblaci&oacute;n en ese rango de edades (1) y la prevalencia general de diabetes tipo 2 (DM2) es de 7,4 % en hombres y 8,7 % en mujeres (2). En 2013 la DM estuvo asociada a 5,1 millones de defunciones a nivel mundial, en personas de ese mismo rango etario, siendo las enfermedades cardiovasculares la principal causa de las mismas. En su etiolog&iacute;a participan simult&aacute;neamente varios factores: gen&eacute;ticos, estilos de vida (dieta, estr&eacute;s, inactividad f&iacute;sica), as&iacute; como tambi&eacute;n algunos determinantes metab&oacute;licos como resistencia a la insulina y alteraci&oacute;n de la tolerancia a la glucosa oral, etc. (3). De diversas maneras y especialmente por el da&ntilde;o macro y microvascular, la DM produce complicaciones serias que deterioran la calidad de vida y aumentan la mortalidad (3). No obstante, a pesar de la disponibilidad de distintos tratamientos, con frecuencia no se logra un adecuado control de la glucemia (4). El tratamiento de esta importante enfermedad se ha dirigido a aumentar la disponibilidad de la insulina, bien sea: administr&aacute;ndola ex&oacute;genamente o por medio de medicamentos que estimulan su secreci&oacute;n, mejorando la sensibilidad de sus receptores, retardando la liberaci&oacute;n y la absorci&oacute;n de carbohidratos en el tracto gastrointestinal o aprovechando el efecto incretina utilizando an&aacute;logos al p&eacute;ptido similar al glucag&oacute;n tipo 1 (GLP-1) (4-6). Dado el creciente entusiasmo y la demostraci&oacute;n de la eficacia de estas nuevas sustancias, se decidi&oacute; realizar la presente revisi&oacute;n.</p>     <p><B>Hemoglobina glicosilada y glucemia postprandial</b></p>      <p>El control de la hiperglucemia y de la hemoglobina glicosilada (HbA1c) es la piedra angular en el manejo de la diabetes (7). Se considera actualmente que el valor normal de la HbA1c es menor a 5,7 % (4). Los niveles de HbA<Sub>1c</Sub> son un reflejo de la integral de la glucosa durante las 24 horas en las &uacute;ltimas 8 a 12 semanas de la medici&oacute;n. Sin embargo, en la &uacute;ltima d&eacute;cada, diversos estudios han demostrado que la glucemia postprandial participa en la aparici&oacute;n de las diferentes complicaciones y al respecto se ha encontrado lo siguiente: </p> <ol>     <p>1. En los pacientes con HbA<Sub>1c</Sub> &lt;7,3 %, la glucemia postprandial contribuye hasta en un 70 % a este valor y por lo tanto, para un estricto control, es muy importante el control de la glicemia postprandial (8).</p>     <p>2. Los elevados niveles de glucemia postprandial se asocian a mayores complicaciones cardiovasculares (9,10), debido al estr&eacute;s oxidativo &mdash;especialmente en la c&eacute;lula endotelial&mdash; y, aunque existe controversia (11), en general se admite que adem&aacute;s de la glucemia en ayunas, la normalizaci&oacute;n de la glicemia postprandial puede ser un blanco terap&eacute;utico (11,12) .</p>    </ol>     <p><B>Carbohidratos, incretinas y vaciamiento g&aacute;strico</b></p>      <p>Desde 1932, se ha demostrado que la ingesti&oacute;n de carbohidratos estimula en el tracto intestinal la producci&oacute;n de sustancias que aumentan la secreci&oacute;n de insulina en el p&aacute;ncreas (6). Por esta propiedad, esas sustancias se denominaron <I>incretinas</I> (del ingl&eacute;s <I>intestinal secretion of insulin</I>). A&ntilde;os despu&eacute;s se describi&oacute; "formalmente" el <I>efecto incretina</I>, denominaci&oacute;n propuesta por Creutzfeldt en 1979 (13). Dicho efecto se define como el aumento de la secreci&oacute;n de insulina por sustancias de origen intestinal que son producidas en respuesta a ciertos nutrientes (especialmente la glucosa y los l&iacute;pidos y en menor medida prote&iacute;nas) (6), por las c&eacute;lulas enteroendocrinas (5,13).</p>     <p>En virtud de este mecanismo, la administraci&oacute;n de una cantidad fija de glucosa produce una secreci&oacute;n de insulina que es 26 % mayor si se suministra por v&iacute;a oral que si se hace por v&iacute;a intravenosa (14). El 90 % de este efecto incretina se debe al GLP-1 y al p&eacute;ptido insulino-tr&oacute;pico dependiente de glucosa, conocido inicialmente como polip&eacute;ptido inhibitorio g&aacute;strico (GIP) (5,15,16). El primero es producido principalmente por las c&eacute;lulas L, que se encuentran distribuidas a lo largo de casi todo el tracto gastrointestinal, especialmente en el &iacute;leon y el colon (5); su administraci&oacute;n a pacientes con DM2 eleva la secreci&oacute;n de insulina dependiente de glucosa (15,16). La vida media de este GLP-1 es de 2-5 minutos debido, fundamentalmente, a su metabolismo por la enzima dipeptidil peptidasa tipo IV (DPP-IV).</p>     <p>Ahora bien, el GIP es secretado por las c&eacute;lulas K, que se encuentran en mayor cantidad en el tracto gastrointestinal superior (5). A diferencia de GLP-1, en pacientes diab&eacute;ticos, la administraci&oacute;n ex&oacute;gena de GIP no produce un aumento significativo de la secreci&oacute;n de insulina (15). Los receptores para el GLP-1 (GLP-1R) se encuentran distribuidos en muchos &oacute;rganos tales como el sistema nervioso central, el tracto gastrointestinal, el sistema cardiovascular y las c&eacute;lulas &beta; de los islotes pancre&aacute;ticos, entre otros (5). El GLP-1R estimula la producci&oacute;n de AMP c&iacute;clico que, por diversas v&iacute;as de se&ntilde;alizaci&oacute;n, produce aumento de calcio intracelular y, adem&aacute;s, inhibe los canales de potasio K&nu;, impidiendo la repolarizaci&oacute;n de la c&eacute;lula (5). Estos cambios amplifican la secreci&oacute;n de insulina inducida por glucosa y de igual manera la activaci&oacute;n de GLP-1R aumenta la transcripci&oacute;n del gen de la insulina, la s&iacute;ntesis de insulina e inhibe la secreci&oacute;n de glucag&oacute;n (17).</p>     ]]></body>
<body><![CDATA[<p>Este &uacute;ltimo mecanismo ha demostrado ser tan importante como el efecto sobre la secreci&oacute;n de insulina para disminuir la glucemia (18). En personas no diab&eacute;ticas, el 50-70 % de la secreci&oacute;n de insulina es consecuencia del efecto incretina, mientras en DM2 es s&oacute;lo responsable del 10 al 40 % (19), por lo cual se considera que en la fisiopatolog&iacute;a de la DM2 pueden estar involucrados trastornos en la din&aacute;mica de las incretinas y adem&aacute;s hay disminuci&oacute;n de los niveles de GLP-1 (20,21). Entre los mecanismos considerados claves para el efecto antidiab&eacute;tico de estas sustancias, se encuentran los siguientes: </p><ol>     <p>1. En modelos animales se ha encontrado que GLP-1 disminuye el apetito y aumenta la saciedad y, de la misma manera, se han encontrado receptores GLP-1 en las zonas del sistema nervioso central que se sabe controlan la saciedad/hambre (5,17) </p>     <p>2. Aumento de la masa de las c&eacute;lulas &beta;, por inducir la proliferaci&oacute;n e inhibir la apoptosis de las mismas simult&aacute;neamente (5,17,22). Asimismo, se ha demostrado una disminuci&oacute;n del estr&eacute;s del ret&iacute;culo endopl&aacute;smico de estas c&eacute;lulas (5), y en general aumento de c&eacute;lulas pancre&aacute;ticas endocrinas y exocrinas en cad&aacute;veres de pacientes diab&eacute;ticos tratados con terapia incret&iacute;nica frente a diab&eacute;ticos no tratados con estos medicamentos (23).</p>     <p>3. Disminuci&oacute;n del vaciamiento g&aacute;strico (VG) (20). Tanto en diab&eacute;ticos como en no diab&eacute;ticos, el VG es responsable de aproximadamente el 35 % de la variabilidad de la glucemia (24,25) y probablemente por este mecanismo se explican las principales acciones antidiab&eacute;ticas de las incretinas, que incluso pueden tener una importancia mayor que el efecto insulino-tr&oacute;pico de las mismas (26).</p>    </ol>      <p>Los niveles de glucemia postprandial son influidos por diversos factores tales como los niveles de glucosa previos, la composici&oacute;n de los alimentos, la velocidad con que &eacute;stos son digeridos e impulsados al intestino, la absorci&oacute;n intestinal y la respuesta insul&iacute;nica, adem&aacute;s del metabolismo perif&eacute;rico que se haga de los carbohidratos. Pero de estos determinantes, los m&aacute;s importantes son el VG y el efecto incretina (26).</p>      <p>El VG es un proceso complejo en el cual hay una integraci&oacute;n coordinada de varios eventos fisiol&oacute;gicos que incluyen la actividad motora del est&oacute;mago proximal, del antro, del p&iacute;loro y del duodeno (27). Los pasos m&aacute;s importantes involucrados se inician con una <I>relajaci&oacute;n "receptiva"</I> del fundus para acomodar los alimentos ingeridos, seguida de una <I>relajaci&oacute;n adaptativa</I> m&aacute;s prolongada. Simult&aacute;neamente el est&oacute;mago distal presenta contracciones circulares las cuales desplazan los alimentos hac&iacute;a el p&iacute;loro. Esas ondas se originan en el marcapasos g&aacute;strico, localizado en las c&eacute;lulas intersticiales de Cajal en el est&oacute;mago proximal, que producen tres ciclos por minuto (28). Los s&oacute;lidos inicialmente son almacenados en el est&oacute;mago proximal y progresivamente triturados hasta el punto que las part&iacute;culas tengan un tama&ntilde;o de 1 mm. Estas contin&uacute;an mezcl&aacute;ndose con el jugo g&aacute;strico formando el quimo, que entonces es vaciado hacia el duodeno a una "velocidad" de 1 a 4 Kcal/min (29). Esta tasa de vaciamiento es controlada por retroalimentaci&oacute;n negativa, la cual est&aacute; mediada por hormonas intestinales tales como la colecistoquinina, el p&eacute;ptido YY y el GLP-1(5)(<a href="#f1">Figura 1</a>)..</p>     <p align="center"><a name="f1"></a><img src="img/revistas/rfmun/v63n2/v63n2a12f1.jpg"></p>     <p>El est&oacute;mago tritura los alimentos que son liberados cuando su tama&ntilde;o alcanza 1mm a una velocidad (ver comentario de arriba) de 1-4Kcal/min. Ahora bien, el intestino libera GLP-1, el cual disminuye el apetito, aumenta la secreci&oacute;n de insulina y disminuye la producci&oacute;n de glucag&oacute;n, que da lugar a una disminuci&oacute;n de la glucemia postprandial (GPP) y de la hemoglobina glicosilada (HbA<Sub>1c</Sub>). El GLP-1 adicionalmente disminuye el vaciamiento g&aacute;strico.</p>     <p>El vaciamiento del contenido g&aacute;strico hacia el intestino produce una elevaci&oacute;n de la glucemia y simult&aacute;neamente estimula la secreci&oacute;n de incretinas. Correlativo a lo anterior, la acci&oacute;n incret&iacute;nica y la elevaci&oacute;n de la glucemia act&uacute;an inhibiendo el VG y, de esta manera, se logra un equilibrio homeost&aacute;tico (26). Cuando el GLP-1 es administrado ex&oacute;genamente por v&iacute;a venosa produce una marcada reducci&oacute;n de la motilidad g&aacute;strica tanto en sujetos sanos como en los que tienen DM2 (30,31), mientras que el GIP produce incluso un peque&ntilde;o aumento del vaciamiento (32). Cuando hay hiperglucemia, se atrasa el VG y los agentes proquin&eacute;ticos &mdash;como la eritromicina&mdash; no producen aumento significativo del &eacute;ste (33). Por el contrario, la hipoglucemia aumenta el vaciamiento, incluso a pesar de estar utilizando agonistas GLP-1 u otros agentes con acciones similares (34).</p>     ]]></body>
<body><![CDATA[<p>La magnitud del retraso del VG que ocurre con GLP-1 depende del estado basal (34); es decir, que si ya existe un vaciamiento lento, los cambios son m&iacute;nimos, pero hace falta que nuevos estudios cuantifiquen estas diferencias en pacientes con gastroparesia. La capacidad de GLP-1 para disminuir la glucemia postprandial es proporcional a la disminuci&oacute;n del vaciamiento (35,36). La regulaci&oacute;n del VG y, en consecuencia, de la glucemia postprandial repercute de modo importante en el control metab&oacute;lico. El alcance del problema es grande, ya que se ha visto que entre un 30 y 50 % de pacientes con DM (DM1 y DM2) de larga evoluci&oacute;n presentan retraso del VG (26) y, por tener poca sintomatolog&iacute;a (37), la mayor parte de estos pasan desapercibidos. El control y seguimiento de la DM se hace m&aacute;s dif&iacute;cil cuando hay alteraciones del VG.</p>     <p>Cuando el tr&aacute;nsito g&aacute;strico se atrasa en diab&eacute;ticos que no utilizan insulina, se aprecia una disminuci&oacute;n de las excursiones gluc&eacute;micas postprandiales, y lo contrario ocurre cuando aumenta el vaciamiento (38). Es preciso tener presente que en diab&eacute;ticos con gastroparesia, disminuyen los requerimientos de insulina y, por ello, es preciso ajustar las dosis de los medicamentos para el control de la glucemia (34). Teniendo en cuenta el efecto incretina del GLP-1, los agonistas sint&eacute;ticos de este han emergido como una importante opci&oacute;n terap&eacute;utica en los pacientes con DM. Adem&aacute;s de su efecto sobre la secreci&oacute;n de insulina y la disminuci&oacute;n del VG, estas sustancias tienen efectos en varios &oacute;rganos y sistemas que tienen receptores para el mismo (5). Entre &eacute;stos, los m&aacute;s importantes son los siguientes: </p>     <p><B>Cardioprotecci&oacute;n.</B> Hay evidencia experimental <I>in vitro</I> y en animales, de que los agonistas del GLP-1R ejercen acciones cardioprotectoras directas sobre los cardiomiocitos y los vasos sangu&iacute;neos, disminuyen la presi&oacute;n arterial en DM2, poseen efectos renales natriur&eacute;ticos y, en estudios precl&iacute;nicos, han demostrado reducir la disfunci&oacute;n cardiovascular y la inflamaci&oacute;n (39).</p>     <p><B>Neuroprotecci&oacute;n.</B> El GLP-1 interviene en la generaci&oacute;n de neuronas y c&eacute;lulas gliales, aumenta la plasticidad neuronal y mejora la actividad del sistema dopamin&eacute;rgico (40); pero al igual que con los efectos cardiovasculares, hacen falta estudios que demuestren en humanos los efectos observados en los modelos precl&iacute;nicos.</p>     <p><B>Natriuresis.</B> Se han encontrado GLP-1R en el ri&ntilde;&oacute;n localizado en los t&uacute;bulos proximales y en el endotelio glomerular, y se ha demostrado que la administraci&oacute;n de GLP-1 produce aumento de la natriuresis y disminuci&oacute;n de la presi&oacute;n arterial. Al parecer hay un mecanismo indirecto adicional consistente en el est&iacute;mulo de secreci&oacute;n de p&eacute;ptido natriur&eacute;tico auricular (41).</p>     <p><B>Mineralizaci&oacute;n &oacute;sea.</B> Estudios en roedores han evidenciado que GLP-1 favorece la mineralizaci&oacute;n del hueso. Se postulan efectos directos sobre los osteoblastos y se conocen mecanismos directos sobre las c&eacute;lulas C tiroideas (est&iacute;mulo de secreci&oacute;n de calcitonina y por ende antagonismo de la resorci&oacute;n &oacute;sea) (42).</p>     <p><B>Tejido adiposo.</B> En la grasa blanca, se han encontrado GLP-1R que median acciones lipol&iacute;ticas y antiinflamatorias lo mismo que en grasa abdominal de sujetos obesos (reducci&oacute;n de macr&oacute;fagos M1 "proinflamatorios" y de citoquinas) (43).</p>     <p>Farmacol&oacute;gicamente, el efecto de GLP-1 se puede lograr bien sea utilizando agonistas que tengan una vida media m&aacute;s larga y que eviten ser metabolizados por la enzima DPP-IV o bien inhibiendo esta &uacute;ltima para que la producci&oacute;n end&oacute;gena y natural de GLP-1 ejerza su actividad m&aacute;s tiempo al evitar que sea r&aacute;pidamente metabolizado (44). Ambas estrategias impactan positivamente el control metab&oacute;lico de los pacientes diab&eacute;ticos, pero s&oacute;lo los agonistas directos de GLP-1 tienen efectos significativos sobre el VG y sobre reducci&oacute;n de peso.</p>     <p>Las diferencias entre los agonistas de GLP-1 y los inhibidores de DPP-IV radican en el comportamiento de GLP-1 que, en el caso de los inhibidores de la enzima, corresponde simplemente al del p&eacute;ptido end&oacute;geno. Con el uso de agonistas, hay un aumento de los niveles de GLP-1, mientras que con los inhibidores de DPP-IV s&oacute;lo se logra disminuir el catabolismo de la incretina end&oacute;gena (45). Los agonistas directos son m&aacute;s resistentes a la acci&oacute;n enzim&aacute;tica y poseen una afinidad mayor por el receptor. Estas diferencias hacen que los agonistas de GLP-1 reduzcan el VG y logren, en la mayor&iacute;a de los casos, reducci&oacute;n de peso; mientras los inhibidores de DPP-IV s&oacute;lo tienen un efecto neutro sobre &eacute;ste (45) y no modifican el VG (31). Existen varios an&aacute;logos de GLP1, y los que en la actualidad se encuentran disponibles para uso en la cl&iacute;nica son: el exenatide, lixisenatide, exenatide de liberaci&oacute;n prolongada y el liraglutide (46-49). <a href="#t1">Tabla 1</a>.</p>     <p align="center"><a name="t1"></a><img src="img/revistas/rfmun/v63n2/v63n2a12t1.jpg"></p>     ]]></body>
<body><![CDATA[<p>No hay estudios que permitan definir, con un soporte claro en la evidencia, las indicaciones precisas sobre el momento en el cual deben incorporarse estos medicamentos en el manejo de la diabetes. Sin embargo, por su mecanismo de acci&oacute;n y por los estudios con los que contamos actualmente, las recomendaciones de las asociaciones internacionales, sugieren su uso como coadyuvante farmacol&oacute;gico en el manejo de los pacientes con DM2, indicando que pueden adicionarse como parte del grupo de medicamentos de segunda o tercera l&iacute;nea, en pacientes en quienes no se haya logrado un control gluc&eacute;mico &oacute;ptimo y que tienen beneficios adicionales en pacientes con &iacute;ndice de masa corporal elevado (4,50,51). Se se&ntilde;ala adem&aacute;s la ventaja de ser uno de los medicamentos que no inducen hipoglucemia (52). Basados en los estudios realizados hasta ahora y a las recomendaciones de las asociaciones antes mencionadas, los agonistas del receptor GLP-1 pueden combinarse en la pr&aacute;ctica cl&iacute;nica actual con insulinas, metformina, sulfonilureas y tiazolidinedionas.</p>     <p>Lixisenatide es el an&aacute;logo que tiene mayor afinidad por el receptor de GLP-1 (53). En el grupo de los agonistas de corta acci&oacute;n, exenatide tiene una afinidad al receptor similar al GLP-1 end&oacute;geno, mientras lixisenatide es 4 veces m&aacute;s af&iacute;n (53). El efecto sobre el VG de los an&aacute;logos de acci&oacute;n larga se aminora con rapidez probablemente por la taquifilaxia secundaria a una estimulaci&oacute;n permanente del receptor (54). Esta &uacute;ltima e importante diferencia es seguramente la responsable de que los an&aacute;logos de acci&oacute;n corta tengan un mayor impacto sobre la glucemia postprandial (GPP), y de ah&iacute; que se les denomine an&aacute;logos prandiales; mientras que los de acci&oacute;n larga no impactan esta variable y se conocen como an&aacute;logos no prandiales (55).</p>     <p>Los dos an&aacute;logos de acci&oacute;n corta han demostrado mejor&iacute;a de los niveles de glucemia postprandial, con cifras que var&iacute;an de acuerdo al dise&ntilde;o de los estudios y del manejo previo con el que ven&iacute;a el paciente. La reducci&oacute;n con exenatide oscila entre el 30,6 mg/dL y el 118,8 mg/dL y lixisenatide entre el 99 mg/dL y el 111,6 mg/dL (55). El estudio GetGoal-X (56), orientado a demostrar no inferioridad de lixisenatide con respecto a exenatide, evidenci&oacute; que ten&iacute;an una eficacia similar en reducci&oacute;n de HbA<Sub>1c</Sub> como desenlace primario y con un perfil bastante similar en cuanto a disminuci&oacute;n de peso, glucemia basal y efectos secundarios.</p>     <p>Varios estudios han comparado an&aacute;logos de acci&oacute;n corta con los de larga acci&oacute;n con las siguientes diferencias principales:</p>     <p><B>Exenatide &ndash; Liraglutide</B>: Se document&oacute; mayor disminuci&oacute;n de la GPP con exenatide (57). Liraglutide fue superior en la intensidad de la reducci&oacute;n de la HbA<Sub>1c</Sub> (1,12 % contra 0,79 %) (57).</p>     <p><B>Exenatide &ndash; Exenatide LP</B>: Exenatide de corta acci&oacute;n tuvo un descenso m&aacute;s marcado sobre la GPP. A las 30 semanas de terapia, la glucemia 2 horas postprandial fue de 28,8 mg/dL menor con exenatide de corta acci&oacute;n (58). Sin embargo, se obtuvieron niveles m&aacute;s bajos de HbA<Sub>1c</Sub> con exenatide de aplicaci&oacute;n semanal (reducci&oacute;n de 1,9 % contra 1,5 %) (58).</p>     <p><B>Lixisenatide &ndash; Liraglutide</B>. A los 28 d&iacute;as de tratamiento, la glucemia 2 horas postprandial en el grupo de lixisenatide fue 154 mg/dL menor (226,8 mg/dL contra 72 mg/dL) (59). Por el contrario, liraglutide mostr&oacute; superioridad en los par&aacute;metros de glucemia basal de ayuno, HbA<Sub>1c</Sub> y peso (reducciones con diferencias de 18 mg/dL, 0,2 % y 0,8 Kg respectivamente) (59).</p>     <p>Finalmente, con respecto a las diferencias entre los an&aacute;logos de larga acci&oacute;n entre s&iacute;, el estudio DURATION-6 muestra que liraglutide tiene una reducci&oacute;n mayor sobre los niveles de HbA<Sub>1c</Sub> (1,48 % contra 1,28 %), mientras que hubo m&aacute;s p&eacute;rdida de peso con exenatide LP (3,57 kg frente a 2,68 kg) (60).</p>     <p><B>Efectos secundarios de los agonistas GLP-1</b></p>      <p>Los efectos adversos m&aacute;s frecuentes son n&aacute;useas, v&oacute;mito y diarrea, los cuales se han encontrado entre 10-40 % de los pacientes (61). Las n&aacute;useas y el v&oacute;mito usualmente desaparecen una a tres semanas despu&eacute;s de iniciar la medicaci&oacute;n (57,62). En diversos estudios se han descrito otros efectos m&aacute;s serios, pero existe controversia con relaci&oacute;n a los mismos (58,59), ya que no hay evidencia de que haya una asociaci&oacute;n de causalidad entre estos medicamentos y las complicaciones reportadas en los estudios precl&iacute;nicos (63-65). Los principales efectos adversos en disputa asociados a su uso son los siguientes:</p>      ]]></body>
<body><![CDATA[<p><B>Pancreatitis</B>: Cl&aacute;sicamente esta patolog&iacute;a se presenta con mayor frecuencia en pacientes diab&eacute;ticos con respecto a los no diab&eacute;ticos. En los estudios retrospectivos no se ha encontrado asociaci&oacute;n estad&iacute;stica entre esta entidad y el uso de terapia proincret&iacute;nica (66), aunque hay cr&iacute;ticas sobre la metodolog&iacute;a utilizada en algunas de esas investigaciones (64). No obstante, en los ensayos cl&iacute;nicos s&iacute; se han reportado m&aacute;s casos de pancreatitis en el grupo de tratamiento con agonistas GLP-1 que en el grupo placebo (67,68).</p>     <p><B>C&aacute;ncer de p&aacute;ncreas</B>: Hasta el momento se ha encontrado igualmente una asociaci&oacute;n, sin comprobar causalidad, pero s&oacute;lo se dispone de estudios observacionales (65).</p>     <p><B>C&aacute;ncer de tiroides</B>: En estudios con modelos animales se ha encontrado que la activaci&oacute;n del receptor GLP-1 puede desencadenar hiperplasia de las c&eacute;lulas C de la tiroides y desarrollo de carcinoma medular, pero no hay a&uacute;n resultados de los estudios en desarrollo que permitan establecer conclusiones de lo que ocurre en humanos a largo plazo (66). Igualmente se ha encontrado expresi&oacute;n de receptores GLP-1 en c&eacute;lulas de carcinoma papilar de tiroides, aunque se desconoce la significancia cl&iacute;nica de este hallazgo (64).</p>     <p>Como recomendaciones pr&aacute;cticas con respecto a estos posibles riesgos, se desaconseja el uso de estos medicamentos en pacientes con diagn&oacute;stico previo de c&aacute;ncer medular de tiroides o neoplasia endocrina m&uacute;ltiple tipo 2 y c&aacute;ncer de p&aacute;ncreas. Deben usarse con precauci&oacute;n en pacientes con factores de riesgo para desarrollar pancreatitis (litiasis biliar, ingesta pesada de alcohol e hipertrigliceridemia). Igualmente, es importante explicar al paciente los s&iacute;ntomas de pancreatitis para que busque valoraci&oacute;n m&eacute;dica (69).</p>     <p><B><font size="3">Conclusiones</font></b></p>     <p>DM2 es una enfermedad de alta prevalencia que se encuentra en aumento a nivel mundial y tiene importantes complicaciones con aumento de la morbimortalidad en los pacientes. Su adecuado manejo influye enormemente en la calidad de vida y en la disminuci&oacute;n de la mortalidad. El conocimiento sobre la influencia del VG en los niveles de glucemia, mediados fundamentalmente por el efecto incretina de GLP-1, se ha traducido en la s&iacute;ntesis de an&aacute;logos de &eacute;ste como una nueva estrategia terap&eacute;utica con resultados favorables en el manejo de la DM2. Hasta el momento los resultados son muy alentadores y la inspiraci&oacute;n para su utilizaci&oacute;n es el renovado inter&eacute;s del efecto incretina y la disminuci&oacute;n del VG como un mecanismo adicional para disminuir la disponibilidad de glucosa en el tracto gastrointestinal para su absorci&oacute;n. Se esperan estudios a largo plazo para determinar el impacto de estos nuevos medicamentos en el control de esta importante patolog&iacute;a, as&iacute; como tambi&eacute;n la incidencia real de efectos adversos.</p>     <p><B>Conflicto de intereses</b></p>     <p>Ninguno declarado por los autores.</p>     <p><B>Financiaci&oacute;n </b></p>     <p>Ninguna declarada por los autores.</p>     ]]></body>
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