<?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>1690-3110</journal-id>
<journal-title><![CDATA[Revista Venezolana de Endocrinología y Metabolismo]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Venez. Endocrinol. Metab.]]></abbrev-journal-title>
<issn>1690-3110</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Venezolana de Endocrinología y Metabolismo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1690-31102008000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Grelina en regulación del apetito y papel en obesidad y trastornos alimentarios: Abordajes terapéuticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tucci]]></surname>
<given-names><![CDATA[Sonia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Liverpool School of Psycology ]]></institution>
<addr-line><![CDATA[Liverpool ]]></addr-line>
<country>England</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<volume>6</volume>
<numero>2</numero>
<fpage>15</fpage>
<lpage>23</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S1690-31102008000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S1690-31102008000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S1690-31102008000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La grelina es una hormona peptídica secretada principalmente por el estómago. Fue descrita inicialmente como un factor estimulador de la secreción de hormona de crecimiento. Sin embargo pronto se descubrió que también juega un papel importante en la regulación del comportamiento alimentario tanto en animales como en humanos; la grelina estimula el apetito y por lo tanto está implicada en el control del balance energético y peso corporal. La regulación anormal de los niveles de grelina conduce tanto a sobre peso como a bajo peso. Adicionalmente, parece ser que la eficacia de las diferentes estrategias utilizadas en el control del peso corporal depende en parte en su capacidad de modificar los niveles plasmáticos de grelina. Mientras que los efectos de la grelina han sido relativamente bien documentados, los mecanismos responsables de sus efectos están siendo continuamente investigados y actualizados. Como consecuencia de esto, actualmente se están comenzando a desarrollar una serie de aplicaciones clínicas para los agonistas y antagonistas grelinérgicos El propósito de esta revisión es proveer información actualizada sobre el mecanismo de acción y papel de la grelina en regulación de la ingesta alimentaria y el balance energético. También se discutirá brevemente el papel de dicha hormona como blanco potencial de drogas para el tratamiento de la obesidad y caquexia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Ghrelin is a peptide hormone secreted by the stomach. It was initially described as a stimulant of growth hormone secretion. Soon, however, it was discovered to play an important role in feeding behaviour in animals and in appetite regulation in man: ghrelin stimulates appetite, and as such is an orexigenic peptide implicated in energy balance mechanisms and weight gain. Abnormal ghrelin activity leads to over- or underweight. Additionally, the efficacy of different treatment strategies against obesity seems to be related to modifications in plasma ghrelin levels. Whereas the effects of ghrelin in the regulation of appetite, food intake and energy homeostasis have been fairly well documented, the pathways responsible for the effects of ghrelin are now increasingly being understood. As a consequence, clinical applications of ghrelin are now being developed. The purpose of this review is to provide updated information on the role of ghrelin in food intake and energy homeostasis, and on its mechanism of action. Moreover, the potential of ghrelin as a target for drugs to treat cachexia and obesity will be discussed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Homeóstasis energética]]></kwd>
<kwd lng="es"><![CDATA[metabolismo]]></kwd>
<kwd lng="es"><![CDATA[peso]]></kwd>
<kwd lng="es"><![CDATA[grasa corporal]]></kwd>
<kwd lng="es"><![CDATA[hipotálamo]]></kwd>
<kwd lng="es"><![CDATA[bulimia]]></kwd>
<kwd lng="en"><![CDATA[Energy homeostasis]]></kwd>
<kwd lng="en"><![CDATA[metabolism]]></kwd>
<kwd lng="en"><![CDATA[appetite]]></kwd>
<kwd lng="en"><![CDATA[weight]]></kwd>
<kwd lng="en"><![CDATA[body fat]]></kwd>
<kwd lng="en"><![CDATA[hypothalamus]]></kwd>
<kwd lng="en"><![CDATA[bulimia anorexia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   				    <p style="line-height: 100%" align="center"><b> 				<span style="color: #231f20">                 <font face="Verdana" size="3">Grelina en regulación del apetito y papel en  				obesidad y trastornos alimentarios: Abordajes terapéuticos</font></span></b></p> 				    <p style="line-height: 100%" align="center"><b> 				<font size="2" face="Verdana"> 				<span style="color: #231f20" lang="EN-GB">                 Sonia Tucci</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20" lang="EN-GB">                 School of Psychology, University of Liverpool,  				Eleanor Rathbone Building, Bedford Street South, Liverpool L69  				7ZA, England</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"><b> 				<span style="color: #231f20">                 Dirigir correspondencia a:</span></b> 				<span style="color: #231f20">  Dra. Sonia Tucci. <a href="mailto:sonia.tucci@liv.ac.uk">  				sonia.tucci@liv.ac.uk</a></span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Resumen</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La grelina es una hormona peptídica secretada  				principalmente por el estómago. Fue descrita inicialmente como  				un factor estimulador de la secreción de hormona de crecimiento.  				Sin embargo pronto se descubrió que también juega un papel  				importante en la regulación del comportamiento alimentario tanto  				en animales como en humanos; la grelina estimula el apetito y  				por lo tanto está implicada en el control del balance energético  				y peso corporal. La regulación anormal de los niveles de grelina  				conduce tanto a sobre peso como a bajo peso. Adicionalmente,  				parece ser que la eficacia de las diferentes estrategias  				utilizadas en el control del peso corporal depende en parte en  				su capacidad de modificar los niveles plasmáticos de grelina.  				Mientras que los efectos de la grelina han sido relativamente  				bien documentados, los mecanismos responsables de sus efectos  				están siendo continuamente investigados y actualizados. Como  				consecuencia de esto, actualmente se están comenzando a  				desarrollar una serie de aplicaciones clínicas para los  				agonistas y antagonistas grelinérgicos El propósito de esta  				revisión es proveer información actualizada sobre el mecanismo  				de acción y papel de la grelina en regulación de la ingesta  				alimentaria y el balance energético. También se discutirá  				brevemente el papel de dicha hormona como blanco potencial de  				drogas para el tratamiento de la obesidad y caquexia.</span></font></p> 				    <p style="line-height: 100%" align="justify">                 <font size="2" face="Verdana"> 				<b><span style="color: #231f20">Palabras claves:</span></b><span style="color: #231f20">  				Homeóstasis energética, metabolismo, peso, grasa corporal,  				hipotálamo, bulimia.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"> 				<span style="color: #231f20; text-transform: uppercase" lang="EN-GB">                 Abstract</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20" lang="EN-GB">                 Ghrelin is a peptide hormone secreted by the  				stomach. It was initially described as a stimulant of growth  				hormone secretion. Soon, however, it was discovered to play an  				important role in feeding behaviour in animals and in appetite  				regulation in man: ghrelin stimulates appetite, and as such is  				an orexigenic peptide implicated in energy balance mechanisms  				and weight gain. Abnormal ghrelin activity leads to over- or  				underweight. Additionally, the efficacy of different treatment  				strategies against obesity seems to be related to modifications  				in plasma ghrelin levels. Whereas the effects of ghrelin in the  				regulation of appetite, food intake and energy homeostasis have  				been fairly well documented, the pathways responsible for the  				effects of ghrelin are now increasingly being understood. As a  				consequence, clinical applications of ghrelin are now being  				developed. The purpose of this review is to provide updated  				information on the role of ghrelin in food intake and energy  				homeostasis, and on its mechanism of action. Moreover, the  				potential of ghrelin as a target for drugs to treat cachexia and  				obesity will be discussed.</span></font></p> 				    ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="justify">                 <font size="2" face="Verdana"> 				<b> 				<span style="color: #231f20" lang="EN-GB">                 Key words:</span></b><span style="color: #231f20" lang="EN-GB">  				Energy homeostasis, metabolism, appetite, weight, body fat,  				hypothalamus, bulimia anorexia.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"><b> 				<span style="color: #231f20">                 Artículo recibido en:</span></b> 				<span style="color: #231f20">  Enero 2008. <b> Aceptado para  				publicación en:</b> Mayo 2008.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Regulación fisiológica del apetito</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La obesidad es una enfermedad de origen  				multifactorial que acarrea numerosas complicaciones. Puede  				definirse como un exceso de grasa corporal que por lo general, y  				no siempre, va acompañado por un incremento del peso corporal.  				Un individuo es catalogado como obeso cuando su índice de masa  				corporal (IMC) es igual o mayor de 30 <sup>[1]</sup>. La  				obesidad es un factor de riesgo conocido para enfermedades  				crónicas que limitan y acortan la vida como: diabetes,  				cardiopatías, hipertensión arterial, accidentes  				cerebrovasculares y algunas formas de cáncer entre otras <sup> 				[2-4]</sup>. Debido al aumento en la mortalidad y morbilidad a  				que la obesidad acarrea y que dicho problema está adquiriendo  				las características de una auténtica epidemia, grandes esfuerzos  				se están dedicado al entendimiento de los mecanismos  				responsables del control del apetito y balance energético.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 El control del peso y de la composición corporal  				dependen del balance entre la energía ingerida, y la energía  				gastada por el organismo. Este balance energético está regulado  				por mecanismos que actúan a corto plazo, por ejemplo, el ciclo  				ingesta-saciedad que ocurre diariamente, y también por  				mecanismos que controlan el peso corporal a largo plazo  				permitiendo un mantenimiento relativamente estable del peso  				corporal a pesar de fluctuaciones diarias en la dieta y gasto  				energético. El comportamiento alimentario a corto plazo está  				controlado por una serie de señales hormonales, psicológicas y  				neurales que se originan en el tracto gastrointestinal. El  				control del mantenimiento relativamente estable del peso  				corporal a largo plazo se encuentra a cargo de factores  				hormonales como la insulina y la leptina, que aunados a niveles  				plasmáticos de nutrientes circulantes indican al sistema  				nervioso central (SNC) el estado de los depósitos de energía (en  				forma de grasa). Todas estas señales convergen en el SNC donde  				finalmente se define el comportamiento alimentario. Inicialmente  				se pensó que el sistema fisiológico de regulación del apetito en  				el SNC se encontraba exclusivamente en el hipotálamo ya que  				lesiones en las diversas áreas de esta estructura afectaban el  				comportamiento alimentario y la regulación del peso corporal.  				Por ejemplo, las lesiones bilaterales del hipotálamo  				ventromedial producían hiperfagia y obesidad, mientras que las  				lesiones del hipotálamo lateral se traducían en afagia y pérdida  				de peso <sup>[5-7]</sup>. Sin embargo, recientes investigaciones  				han demostrado que existen otras áreas en el cerebro implicadas  				en la regulación del apetito, y que en dicha regulación ciertos  				neurotransmisores como los neuropéptidos juegan un papel  				fundamental. Aunados a estos mecanismos de regulación central  				existen otras sustancias que se originan en la periferia, la  				mayoría constituidas por péptidos (insulina, péptido similar al  				glucagón GLP-1, leptina) así como la glucosa y otras sustancias  				producidas por el metabolismo, que también ejercen una  				influencia poderosa en la regulación del apetito y peso corporal  				tanto a corto como a largo plazo. El control a corto plazo de la  				ingesta involucra no solo al SNC sino también a otros órganos  				como las glándulas suprarrenales, el páncreas y el tracto  				digestivo. El tejido adiposo juega un importante papel en la  				regulación a largo plazo del peso corporal, esto mediante la  				producción de varios mediadores endocrinos y paracrinos como la  				leptina, adiponectina, resistina y factor de necrosis tumoral  				alfa<sup>[8]</sup>. En vista de que un déficit energético  				compromete al final la sobrevida del organismo, no es  				sorprendente que las vías más predominantes sean aquellas  				destinadas a aumentar la ingesta y a disminuir el gasto  				energético.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Como se dijo anteriormente, existen numerosas  				sustancias, producidas fuera del SNC que intervienen en la  				regulación del apetito. La mayoría son péptidos, de los cuales  				los más estudiados son el péptido intestinal Y (PYY), GLP-1, la  				insulina, la colecistoquinina, la leptina y la grelina. Todos  				estos factores, a excepción de la grelina, inhiben el apetito.  				Dichos factores periféricos actúan sobre los neuropéptidos del  				sistema nervioso central, ya sea directamente, o a través de la  				estimulación del nervio vago. La presente revisión se enfocara  				en el papel de la grelina en la regulación del apetito y peso  				corporal. La grelina es una hormona peptídica de 28 aminoácidos.  				Es uno de los ligandos endógenos (además del factor liberador de  				la hormona de crecimiento (GHRH) y somatostatina para el  				receptor de secretagogos de la hormona del crecimiento (GHS-R).  				El descubrimiento de dicha hormona fue el resultado de la  				llamada “farmacología reversa” la cual empezó con el desarrollo  				de los secretagogos artificiales de la GHRH, siguió con la  				clonación del receptor y finalmente con la identificación del  				ligando natural <sup>[9]</sup>. Tanto en ratas como en humanos,  				la grelina, al unirse a su receptor en las células somatotropas,  				induce, de una manera específica, dosis dependiente y con mayor  				potencia que el GHRH, la liberación de la hormona de crecimiento 				<sup>[10]</sup>. La grelina posee una característica única que  				la diferencia de otros péptidos y parece ser crucial para su  				actividad biológica, la cual es la presencia de un grupo  				octanoil unido a la serina en posición 3. Este resto altamente  				hidrofóbico le confiere a la grelina la capacidad de atravesar  				la barrera hematoencefálica y unirse al subtipo 1a del GHS-R. La  				variante no acilada de grelina, que posee mayores  				concentraciones plasmáticas se une al subtipo 1b del GHS-R, el  				significado fisiológico de esta interacción no está aun  				totalmente clarificado <sup>[11]</sup>. La grelina es producida  				predominantemente por el estómago; pero también otros tejidos la  				producen, como la hipófisis (concretamente las células  				somatotropas, lactotropas y tirotropas <sup>[12]</sup>), varios  				núcleos del hipotálamo, <sup>[9, 13]</sup> placenta <sup>[14]</sup>  				y corazón <sup>[15]</sup>. Además de estos tejidos, el hígado,  				el páncreas endocrino, las gónadas, los pulmones y los  				linfocitos también expresan pequeñas cantidades de grelina <sup> 				[16]</sup>. Esta variada distribución sugiere que la grelina  				posee un amplio espectro de actividades biológicas. Dentro de  				los efectos biológicos de dicha hormona se encuentran la  				regulación de la motilidad y secreción acídica gástrica,  				secreción pancreática, metabolismo lipídico y de la glucosa,  				proliferación celular y también posee una acción  				antiinflamatoria y cardiovascular. De manera muy importante, la  				grelina aumenta el apetito y la ingesta alimentaria, aumenta los  				depósitos grasos y finalmente, el peso corporal. Como se  				describirá a continuación, la grelina juega un papel importante  				en el control tanto a corto como a largo plazo.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Mecanismos fisiológicos involucrados en los  				efectos de la grelina</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La grelina aumenta el apetito mediante su acción  				en varios núcleos hipotalámicos como el núcleo arcuato, núcleo  				paraventricular e hipotálamo lateral. El núcleo arcuato del  				hipotálamo contiene dos poblaciones neuronales involucradas en  				el control de la ingesta alimentaria. El primer grupo contiene  				neuronas que expresan neuropéptido Y (NPY) y la proteína  				asociada a agouti (AGRP), los cuales estimulan el apetito. El  				segundo grupo contiene neuronas que expresan pro-opiomelanocortina  				(POMC), el precursor de la hormona estimulante de alfa  				melanocitos (á-MSH), y el transcrito regulado por  				cocaína-anfetamina (CART), los cuales inhiben el apetito <sup> 				[17]</sup>. El núcleo paraventricular del hipotálamo y el  				hipotálamo lateral contienen neuronas que producen neuropéptidos  				orexigénicos <sup>[18]</sup>. La expresión de grelina se ha  				identificado en neuronas del núcleo arcuato y también en un  				grupo neuronal previamente no caracterizado adyacente al tercer  				ventrículo entre los núcleos dorsal, ventral, paraventricular, y  				arcuato. Estas neuronas envían eferentes a neuronas productoras  				de NPY, AGRP, POMC y orexinas <sup>[13]</sup>. La grelina parece  				estimular el apetito y la ingesta alimentaria mediante acciones  				tanto en las vías orexigénicas como anorexigénicas del  				hipotálamo.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Vía orexigénica central</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La grelina ejerce un efecto excitatorio sobre  				neuronas productoras de NPY/AGRP <sup>[13]</sup>. En ratas, la  				administración intracerebroventricular de grelina induce una  				súper expresión de los ARNm de NPY and AGRP <sup>[19]</sup>. La  				inhibición de NPY y AGRP endógenos mediante anticuerpos anti-NPY  				y anti- AGRP , y por antagonistas de los receptores Y1 y Y5  				bloquea el efecto de estimulador del apetito de la grelina <sup> 				[20]</sup>. Aun mas, en ratones con represión deliberada de los  				genes que codifican para NPY o AGRP, el efecto estimulador de la  				grelina se atenúa considerablemente <sup>[21]</sup> y la  				ablación de la neuronas NPY/AGRP suprime completamente las  				respuestas alimentarias a la grelina <sup>[22]</sup>. En humanos  				la grelina aumenta los niveles circulantes de NPY <sup>[23]</sup>.  				Todos estos datos indican que la grelina activa las neuronas  				hipotalámicas productoras de NPY/AGRP induciendo la producción  				de dichos péptidos y consecuentemente aumentando la ingesta  				alimentaria.</span></font></p> 				    ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La administración intracerebroventricular de  				grelina también activa el núcleo paraventricular y el hipotálamo  				lateral incluyendo las neuronas productoras de orexinas <sup> 				[24]</sup>. Se ha demostrado que in-vitro la grelina activa a  				las neuronas que expresan orexinas (neuropéptidos hipotalámicos  				orexigénicos) <sup>[25]</sup>. La estimulación del apetito  				inducida por grelina no es evidente en ratones con represión  				deliberada de los genes para orexina y en ratones  				preadministrados con anticuerpos antiorexinas <sup>[26]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La administración sistémica de grelina induce  				aumentos de noradrenalina en el núcleo arcuato y la destrucción  				de neuronas que expresan dopamina [beta]-hidroxilasa elimina el  				efecto estimulante del apetito de la grelina, lo cual sugiere  				que la grelina estimula la ingesta alimentaria por lo menos en  				parte a través del sistema noradrenérgico <sup>[27]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Via anorexigénica central</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Parece ser que la grelina ejerce un efecto  				inhibidor sobre las neuronas productoras de POMC, previniendo  				así la liberación del péptido anorexigenico á-MSH <sup>[28]</sup>.  				CART inhibe la ingesta y es expresado tanto por aferentes  				vagales como por neuronas hipotalámicas. En ratas, la  				administración de grelina disminuye la expresión de CART en  				neuronas aferentes vagales <sup>[29]</sup> mientras que el  				bloqueo periférico de la grelina mediante anticuerpos  				específicos anti-grelina aumenta la expresión de CART en el  				núcleo paraventricular del hipotálamo <sup>[30]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Vía vagal</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La grelina también parece estimular el apetito a  				través de acciones en el nervio vago. En humanos y ratas, la  				presencia del receptor para grelina en neuronas aferentes al  				ganglio nodoso sugiere que el nervio vago pueda transmitir la  				señal de grelina del estómago al SNC <sup>[31, 32]</sup>. En  				ratas, la vagotomía o la aplicación de una neurotoxina aferente  				suprime la inducción de la ingesta producida por grelina <sup> 				[33]</sup>. Igualmente, los pacientes con vagotomía son  				resistentes a los efectos estimuladores del apetito de la  				grelina <sup>[34]</sup>. Así, a través de la estimulación de  				GHSR en aferentes vagales, la señal grelinérgica puede alcanzar  				el núcleo del tracto solitario, el cual a su vez se comunica con  				el hipotálamo para incitar la ingesta.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Homeostasis energética</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Además del papel de regulación de la ingesta a  				corto plazo, la grelina también parece jugar un papel en la  				regulación del peso corporal a largo plazo. Los niveles  				plasmáticos de grelina están inversamente correlacionados con el  				IMC. Dichos niveles están aumentados en la anorexia nerviosa y  				caquexia y están disminuidos en individuos obesos. El nivel  				plasmático de grelina fluctúa de una manera compensatoria según  				las variaciones en el peso corporal <sup>[35]</sup>. Así, los  				niveles bajan cuando el peso corporal aumenta como consecuencia  				de un aumento en la ingesta<sup>[36]</sup>, embarazo<sup>[37]</sup>,  				tratamiento con olanzapina<sup>[38]</sup> o dietas con elevado  				contenido de grasas<sup>[39]</sup>. Por el contrario, la pérdida  				de peso induce un incremento en los niveles plasmáticos de  				grelina, como por ejemplo, en la pérdida de peso por restricción  				alimentaria,<sup>[40] </sup>y ejercicio crónico a largo plazo  				(no durante el ejercicio agudo)<sup>[41], </sup>caquexia  				inducida por anorexia <sup>[35],</sup> insuficiencia cardiaca  				congestiva severa<sup>[42], </sup>cáncer de mama, colon y pulmón<sup>[43,  				44]. </sup>Sin embargo, la información sobre los niveles de  				grelina después de la pérdida de peso inducida por los bypases  				gastricos es controversial ya que algunos estudios reportan  				disminución <sup>[45, 46] </sup><a href="http://gateway.tx.ovid.com/gw2/ovidweb">http://gateway.tx.ovid.com/gw2/ovidweb</a>.,  				ningún cambio<sup>[47, 48]</sup> o un aumento<sup>[49, 50]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"><i> 				<span style="color: #231f20">                 In vivo</span></i><span style="color: #231f20">, la administración crónica de grelina  				induce aumento del tejido adiposo <sup>[51]</sup>. La grelina  				aumenta el peso corporal no sólo como consecuencia de un aumento  				de la ingesta, sino también por una reducción en el consumo de  				energía, disminución de la utilización de las grasas y aumento  				en la utilización de carbohidratos <sup>[52]</sup>. De hecho, la  				grelina parece tener un efecto sobre el metabolismo de los  				adipocitos. <i> In vitro</i>, la grelina estimula la diferenciación de  				los preadipocitos,<sup>[53] </sup>inhibe la apotosis de los  				adipocitos,<sup>[54] </sup>y bloquea la lipólisis <sup>[55]</sup>.  				La infusión crónica de grelina inhibe la oxidación lipídica y  				aumenta la lipogénesis y captura de triglicéridos en adipocitos  				blancos<sup>[56]. </sup>La grelina también mejora la retención  				de tejido magro<sup>[57]. </sup>En individuos ancianos y después  				de la pérdida de peso inducida por dieta los niveles de grelina  				aumentan con una reducción de la masa magra, especialmente  				musculo esquelético pero sin cambios en el tejido graso<sup>[40,  				58]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Las observaciones en ratones con represión  				deliberada de los genes para grelina sugieren un papel  				fisiológico para dicha hormona en la homeostasis energética. En  				relación al tamaño, tasa de crecimiento, ingesta, composición  				corporal, reproducción, comportamiento y patología tisular, el  				fenotipo de estos ratones es similar al de ratones normales<sup>[59]</sup>.  				Sin embargo, los ratones jóvenes con represión deliberada de los  				genes para grelina son resistentes al aumento de peso causado  				por una dieta alta en grasa. Estos ratones presentan menos  				adiposidad, un mayor consumo de energía y actividad locomotora.  				Esto sugiere que la grelina juega un papel incitando el  				almacenamiento de grasa y disminuyendo el gasto energetico<sup>[60]</sup>.</span></font></p> 				    ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En pacientes con sindrome de Prader-Willi (SPW),  				un trastorno genético caracterizado por retardo mental e  				hiperfagia que conlleva a obesidad severa, los niveles  				plasmáticos de grelina están más elevados que en sujetos sanos y  				no disminuyen después de la ingesta<sup>[61]</sup>. Otros  				estudios muestran que en estos pacientes los niveles de grelina  				decrecen post prandialmente, pero en un grado menor que en  				sujetos obesos y delgados<sup>[62, 63]</sup>. Esta supresión de  				grelina atenuada puede deberse a una supresión del incremento  				post prandial de PYY, un péptido anorexigénico que disminuye los  				niveles post prandiales de grelina. Los bajos niveles de PYY  				podrían explicar en parte los altos niveles de grelina  				observados en pacientes con SPW<sup>[62]</sup>. Es interesante  				hacer notar que los niños menores de 5 años con SPW presentan  				niveles normales de grelina. A esta edad, dichos niños aun no  				han desarrollado hiperfagia y obesidad lo cual sugiere que los  				niveles de grelina aumentan al comenzar la obesidad.<sup>[64]</sup>  				Esto podría indicar que la grelina puede ser responsable, al  				menos en parte del apetito insaciable y la consecuente obesidad  				de estos pacientes.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Obesidad</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20">                 Estudios en animales</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En ratas, la administración de grelina por vía  				intracerebroventricular, intravenosa o subcutánea estimula la  				ingesta alimentaria, disminuye el gasto energético e induce  				aumento de peso<sup>[20]</sup>. En ratones db/db, que es un  				modelo de obesidad caracterizada por mutaciones en el gen del  				receptor de la leptina, la expresión de ARNm de grelina en el  				fundus gástrico, está disminuida comparada con la de ratones  				control<sup>[65]</sup>. Estas alteraciones en la expresión de  				grelina podrían representar un mecanismo de adaptación  				fisiológica al balance energético positivo que se produce en la  				obesidad.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20">                 Estudios en humanos</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En humanos la administración intravenosa de  				grelina aumenta el apetito y estimula la ingesta alimentaria<sup>[66]</sup>.  				La grelina es la única hormona circulante conocida que promueve  				la ingesta después de su administración sistémica. Los niveles  				de grelina aumentan con el ayuno y decaen abruptamente 30  				minutos después de comer, lo que sugiere que dicha hormona pueda  				actuar como una señal para el inicio de la ingesta <sup>[67]</sup>;  				dicha disminución es independiente del valor calórico del  				alimento ingerido. Es sujetos en ayunas los niveles de grelina  				muestran un ritmo circadiano similar al de personas que toman  				tres comidas diarias<sup>[68, 69]</sup>. En sujetos obesos los  				niveles de grelina están disminuidos<sup>[70]</sup>. El 6,3% de  				pacientes obesos posee una mutación en el gen de la grelina lo  				que sugiere que mutaciones en dicho gen podrían jugar un papel  				importante en la etiopatología de ciertos tipos de obesidad<sup>[71]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Estudios que han cuantificado los niveles de  				grelina en pacientes obesos sometidos a bypass gástrico,  				muestran resultados controversiales; algunos observan  				disminución<sup>[45]</sup> mientras que otros no observan  				cambios o incremento<sup>[72]</sup>. En el futuro, más estudios  				son necesarios para dilucidar el efecto de la cirugía  				gastrointestinal sobre los niveles circulantes de grelina y  				clarificar el mecanismo de regulación de la secreción diurna de  				grelina en pacientes tratados con bypass gástrico.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20">                 Anorexia y caquexia</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En estados de malnutrición como la anorexia y  				caquexia, los niveles plasmáticos de grelina se encuentran muy  				elevados y en el caso de la anorexia nerviosa se ha comprobado  				que la recuperación de peso normaliza los niveles plasmáticos de  				grelina hasta valores idénticos a los obtenidos en sujetos  				normales<sup>[73]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En ayuno, los niveles plasmáticos de grelina  				están significativamente más elevados en pacientes con anorexia  				nerviosa que en controles; en ambos grupos, dichos niveles  				muestran una correlación negativa con el porcentaje de grasa  				corporal. Las mujeres con anorexia nerviosa no presentan una  				caída aguda de los niveles de grelina plasmática después de la  				ingesta. Esta respuesta anómala pudiese ser parte de un proceso  				adaptativo a la restricción de alimentos continuada, que tiene  				como finalidad restaurar la conducta alimentaria normal. La  				caquexia es un estado catabólico caracterizado por pérdida de  				peso y de masa muscular, ocurre frecuentemente en pacientes con  				determinadas patologías como el cáncer o la enfermedad cardíaca  				crónica. En pacientes con caquexia, los niveles de grelina  				plasmática están muy elevados<sup>[42, 43]</sup>. Esto podría  				sugerir que teniendo en cuenta el hecho de que la grelina actúa  				induciendo un balance energético positivo, el incremento de los  				niveles plasmático de grelina que se produce en pacientes con  				caquexia podría representar un mecanismo compensatorio del  				desequilibrio catabólicoanabólico típico de esta alteración.</span></font></p> 				    ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20">                 Bulimia</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 La bulimia nerviosa se caracteriza por episodios  				de ingesta incontrolada seguidos normalmente de métodos  				inapropiados de control de peso como inducción del vómito, uso  				de laxantes, enemas, o medicamentos que producen un incremento  				en la producción de orina, así como ayuno prolongado o ejercicio  				excesivo con la finalidad de controlar el peso. Los pacientes  				con bulimia nerviosa acompañada de episodios de vómitos,  				presentan unos niveles plasmáticos de grelina mucho mayores que  				en los pacientes con bulimia nerviosa sin vómitos. Se ha  				postulado que la hiperactividad aferente vagal podría ser un  				factor importante, relacionado con la patofisiología de la  				bulimia nerviosa<sup>[74]</sup>. Se ha visto que existe un  				mecanismo de regulación entre los péptidos intestinales y el  				sistema vago, en este contexto, la grelina pudiese actuar como  				un sistema de retroalimentación por la vía vagal<sup>[75]</sup>.  				Podría ocurrir que en la hiperactividad vagal aferente típica de  				pacientes con bulimia nerviosa estuviese incrementado el nivel  				de grelina circulante<sup>[76]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Aplicaciones clínicas potenciales</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 En vista de que la grelina estimula la ingesta  				alimentaria, los agonistas y antagonistas grelinérgicos tienen  				utilización principalmente en el tratamiento de la caquexia y  				obesidad respectivamente. Aunque los pacientes con caquexia  				tienen niveles plasmáticos de grelina aumentados, en modelos  				animales de caquexia y en pacientes con insuficiencia cardiaca  				congestiva y enfermedad pulmonar obstructiva crónica la  				administración de grelina aumenta la ingesta de alimentos y la  				ganancia de peso<sup>[57, 77]</sup>. Sin embargo, en pacientes  				con caquexia asociada a anorexia el efecto de la grelina es  				controversial<sup>[78]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Por el contrario, la administración del  				antagonista del receptor de grelina, el péptido liberador de la  				hormona de crecimiento 6 [D-Lys-3] disminuye la ingesta de  				alimentos en ratones normales y obesos y reduce la ganancia de  				peso<sup>[79, 80]</sup>. Otros estudio han demostrado que los  				oligonucleótidos antisentido polietilenglicol modificados  				(llamados Spiegelmers) que se unen específicamente a la forma  				acilada de la grelina también disminuyen la ingesta y el peso  				corporal en ratones con obesidad inducida por dieta<sup>[80-82]</sup>.  				La neutralización de la grelina circulante por los Spiegelmers  				pudiese ser útil en el tratamiento de enfermedades asociadas con  				altos niveles circulantes de grelina como el SPW. Una tercera  				opción para el tratamiento de la obesidad sería una vacuna  				antigrelina. Los inmunoconjugados de grelina inducen la  				producción de anticuerpos específicos contra la forma acilada de  				grelina. En ratas con una fuerte respuesta inmunitaria en contra  				de la grelina, la ganancia de peso se ve reducida con una  				respuesta preferencial por el tejido graso comparado con el  				tejido magro, esto logrado en parte al disminuir la eficiencia  				de los alimentos (ganancia de peso por kilocaloría de alimento)<sup>[83]</sup>.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Debido a que el receptor para grelina presenta  				una alta actividad constitutiva, los agonistas inversos del  				receptor, al disminuir dicha actividad podrían ser útiles en el  				tratamiento de la obesidad<sup>[84]</sup>. Durante el ayuno  				prolongado, la expresión del receptor aumenta en el hipotálamo  				lo que lleva a un aumento de la actividad originada por el  				receptor, aumento del apetito y disminución del gasto  				energético. La disminución de la actividad constitutiva del  				GHS-R por un agonista inverso podría aumentar la sensibilidad a  				hormonas anorexigénicas como la leptina o PYY, y prevenir el  				consumo de alimentos entre comidas<sup>[85]</sup>. Sin embargo,  				el uso de agonistas inversos en el tratamiento de la obesidad  				necesita ser investigado más a fondo.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"><span style="color: #231f20; text-transform: uppercase">                 Conclusiones</span></font></b></p> 				    <p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20">                 Actualmente, la importancia de la grelina en la  				regulación del apetito y peso corporal es el foco de una intensa  				investigación. El efecto de la grelina en el apetito es mediado  				en el hipotálamo a través de la inducción de la liberación de  				NPY, AGRP y orexina, la inhibición de la liberación de á-MSH y  				CART, y a través de la activación de GHS-R en aferentes vagales  				en el estómago. El efecto de la grelina en el peso corporal es  				mediado por la estimulación de la ingesta así como por la  				reducción del consumo energético y promoción de la adiposidad.  				Los agonistas grelinérgicos parecen ser útiles en el tratamiento  				de la caquexia inducida por cáncer, insuficiencia cardiaca  				congestiva y enfermedad pulmonar obstructiva crónica. Los  				antagonistas de los receptores grelinérgicos, Spiegelmers y  				vacunas antigrelina reducen la ganancia de peso y podrían ser  				útiles en el tratamiento de la obesidad particularmente en el  				SPW. Sin embargo, en este momento, la gran mayoría de estas  				aplicaciones clínicas de la grelina requieren más investigación.</span></font></p> 				    <p style="line-height: 100%" align="justify"> 				<b> 				<font size="2" face="Verdana"> 				<span style="color: #231f20; text-transform: uppercase" lang="EN-GB">                 Referencias bibliográficas</span></font></b></p> 				    <!-- ref --><p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20" lang="EN-GB">                 1. World Health Organization, Preventing and  				Managing the Global Epidemic of Obesity. Report of the World  				Health Organization Consultation of Obesity. 1997: Geneva.</span></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3063490&pid=S1690-3110200800020000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> 				    <!-- ref --><p style="line-height: 100%" align="justify"> 				<font size="2" face="Verdana"> 				<span style="color: #231f20" lang="EN-GB">                 2. Deedwania PC. Metabolic syndrome and vascular  				disease: is nature or nurture leading the new epidemic of  				cardiovascular disease?. 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