<?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>S1690-31102017000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[POSIBLES RELACIONES ENTRE ENFERMEDAD DE ALZHEIMER, INSULINORRESISTENCIA Y DIABETES MELLITUS TIPO 2]]></article-title>
<article-title xml:lang="en"><![CDATA[POSSIBLE RELATIONSHIPS BETWEEN ALZHEIMER&rsquo;S DISEASE, INSULIN RESISTANCE AND TYPE 2 DIABETES MELLITUS ABSTRACT]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hómez]]></surname>
<given-names><![CDATA[Belinda]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>11</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S1690-31102017000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S1690-31102017000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S1690-31102017000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Enfermedad de Alzheimer (EA) es la causa más común de demencia. Existen múltiples factores de riesgo asociados con la enfermedad, entre ellos la diabetes mellitus tipo 2. En los últimos años un cuerpo creciente de evidencia involucra la insulinorresistencia como causa y consecuencia del desarrollo de lesiones cerebrales típicas de la EA. Actualmente el diagnóstico de EA se basa en criterios clínicos neuropsiquiátricos y confirmación histopatológica post morten; sin embargo, grandes avances en pruebas genéticas, marcadores bioquímicos y neuro-imágenes funcionales permitirán aumentar la precisión diagnóstica. La asociación de alteraciones en la vía de señalización de la insulina con la EA ha dado origen al interés de evaluar agentes originalmente desarrollados para el tratamiento de la diabetes tipo 2 como potenciales terapias. Sin duda aún se requieren numerosas investigaciones que permitan consolidar los hallazgos hasta ahora encontrados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Alzheimer&rsquo;s Disease (AD) is the most common cause of dementia. There are multiple risk factors associated with the disease, including type 2 diabetes mellitus. In recent years a growing body of evidence involves insulin resistance as cause and consequence of the development of brain lesions typical of AD. Currently the diagnosis of AD is based on clinical neuropsychiatric criteria and postmortem histopathological confirmation; however, major advances in genetic testing, biochemical markers and functional neuroimaging will increase diagnostic accuracy. The association of alterations in the signaling pathway of insulin with the AE has given rise to the interest of evaluating agents originally developed for the treatment of type 2 diabetes as potential therapies. Numerous investigations are undoubtedly still needed to consolidate the findings found so far.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedad de Alzheimer]]></kwd>
<kwd lng="es"><![CDATA[insulinorresistencia]]></kwd>
<kwd lng="es"><![CDATA[diabetes mellitus tipo 2.]]></kwd>
<kwd lng="en"><![CDATA[Alzheimer&rsquo;s disease]]></kwd>
<kwd lng="en"><![CDATA[insulin resistance]]></kwd>
<kwd lng="en"><![CDATA[type 2 diabetes mellitus.]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div style="text-align: justify; font-family: Verdana;">     <div style="text-align: center;"><span style="font-weight: bold;">Revisi&oacute;n</span><font size="-1"><br style="font-weight: bold;">    <br style="font-weight: bold;">    </font><font size="-1"><span style="font-weight: bold;">POSIBLES RELACIONES ENTRE ENFERMEDAD DE ALZHEIMER, INSULINORRESISTENCIA Y DIABETES MELLITUS TIPO 2</span><br style="font-weight: bold;">    <br style="font-weight: bold;">    </font><span style="font-weight: bold;">Belinda H&oacute;mez.</span><font size="-1"><br style="font-weight: bold;">    <br style="font-weight: bold;">    </font><font size="-1"><span style="font-weight: bold;">&nbsp;</span></font><font size="-1">Unidad de Endocrinolog&iacute;a, Centro M&eacute;dico Para&iacute;so, Maracaibo, Estado Zulia.</font>    <br>  </div>  <font size="-1">  <span style="font-weight: bold;">RESUMEN</span>    <br>        <br>    La Enfermedad de Alzheimer (EA) es la causa m&aacute;s com&uacute;n de demencia. Existen m&uacute;ltiples factores de riesgo asociados con la enfermedad, entre ellos la diabetes mellitus tipo 2. En los &uacute;ltimos a&ntilde;os un cuerpo creciente&nbsp;de evidencia involucra la insulinorresistencia como causa y consecuencia del desarrollo de lesiones cerebrales t&iacute;picas de la EA. Actualmente el diagn&oacute;stico de EA se basa en criterios cl&iacute;nicos neuropsiqui&aacute;tricos y confirmaci&oacute;n histopatol&oacute;gica post morten; sin embargo, grandes avances en pruebas gen&eacute;ticas, marcadores bioqu&iacute;micos y neuro-im&aacute;genes funcionales permitir&aacute;n aumentar la precisi&oacute;n diagn&oacute;stica. La asociaci&oacute;n de alteraciones en la v&iacute;a de se&ntilde;alizaci&oacute;n de la insulina con la EA ha dado origen al inter&eacute;s de evaluar agentes originalmente desarrollados para el tratamiento de la diabetes tipo 2 como potenciales terapias. Sin duda a&uacute;n se requieren numerosas investigaciones que permitan consolidar los hallazgos hasta ahora encontrados.    <br>        <br>    <span style="font-weight: bold;">Palabras clave:</span> Enfermedad de Alzheimer, insulinorresistencia, diabetes mellitus tipo 2.    <br>        <br>    &nbsp;    <br>    </font>     ]]></body>
<body><![CDATA[<div style="text-align: center;"><font style="font-weight: bold;" size="-1">POSSIBLE RELATIONSHIPS BETWEEN ALZHEIMER&rsquo;S DISEASE, INSULIN RESISTANCE AND TYPE 2 DIABETES MELLITUS ABSTRACT</font><font size="-1">    <br>    </font></div>    <font size="-1">    <br>    Alzheimer&rsquo;s Disease (AD) is the most common cause of dementia. There are multiple risk factors associated&nbsp; with the disease, including type 2 diabetes mellitus. In recent years a growing body of evidence involves insulin resistance as cause and consequence of the development of brain lesions typical of AD. Currently the diagnosis of AD is based on clinical neuropsychiatric criteria and postmortem histopathological confirmation; however, major advances in genetic testing, biochemical markers and functional neuroimaging will increase diagnostic accuracy. The association of alterations in the signaling pathway of insulin with the AE has given rise to the interest of evaluating agents originally developed for the treatment of type 2 diabetes as potential therapies. Numerous investigations are undoubtedly still needed to consolidate the findings found so far.    <br>        <br>    <span style="font-weight: bold;">Key word:</span> Alzheimer&rsquo;s disease, insulin resistance, type 2 diabetes mellitus.    <br>        <br>  <span style="font-weight: bold;">INTRODUCCI&Oacute;N</span>    <br>        <br>    La&nbsp; enfermedad&nbsp; de&nbsp; Alzheimer&nbsp; representa&nbsp; el 60-70% de todas las causas de demencia. Seg&uacute;n la Organizaci&oacute;n Mundial de la Salud (OMS)1, la demencia es un s&iacute;ndrome, generalmente cr&oacute;nico&nbsp; o progresivo, caracterizado&nbsp; por&nbsp; el&nbsp; deterioro&nbsp; de la&nbsp; funci&oacute;n&nbsp; cognitiva&nbsp; m&aacute;s&nbsp; all&aacute;&nbsp; de&nbsp; lo&nbsp; que podr&iacute;a&nbsp;considerarse una consecuencia del envejecimiento normal. Actualmente en el mundo 47,5 millones de personas padecen demencia y se estima que para el a&ntilde;o 2050 dicha cifra se triplicar&aacute;1.    <br>        ]]></body>
<body><![CDATA[<br>    Desde el punto de vista histopatol&oacute;gico lo que caracteriza a la EA es la presencia de placas neur&iacute;ticas, estas son estructuras redondeadas ubicadas entre las neuronas, constituidas principalmente por el amiloide beta (A&beta;) y los ovillos neuro-fibrilares que son lesiones intracelulares cuyo principal componente es la prote&iacute;na TAU hiper-fosforilada. Ambas lesiones se distribuyen en el par&eacute;nquima cerebral en densidad y patr&oacute;n que son caracter&iacute;sticos de la enfermedad2.    <br>        <br>    Existen numerosos factores de riesgo que predis- ponen al desarrollo de EA, unos mejor validados que otros, algunos modificables y otros no, entre los que se pueden mencionar: historia familiar de EA, presencia de Apo E4 y otros genes espec&iacute;ficos, envejecimiento, bajo nivel educativo, trauma craneal, h&aacute;bito tab&aacute;quico, alcoholismo, sobrepeso, inactividad f&iacute;sica, baja estimulaci&oacute;n mental y social, diabetes mellitus, hipertensi&oacute;n arterial, hiperlipidemia, enfermedad cardiovascular, depre- si&oacute;n y ansiedad3. No hay duda de que los m&aacute;s importantes son el envejecimiento y ser portador del alelo Apo E4. Seg&uacute;n el metan&aacute;lisis de Farrer y col4, individuos con este alelo homocigoto presentan un 91% de probabilidad de desarrollar EA, mientras que en los heterocigotos se expresa en un 47%; sin embargo, los individuos no portadores tambi&eacute;n la pueden desarrollar, de manera que la presencia del alelo Apo E4 no es indispensable ni suficiente para la expresi&oacute;n de la EA, lo que ha llevado a&nbsp;&nbsp;&nbsp; la b&uacute;squeda de otros agentes involucrados en su patogenia, entre ellos la insulinorresistencia (IR).    <br>        <br>    <span style="font-weight: bold;">INSULINA Y CEREBRO</span>    <br>        <br>    El cerebro es el principal consumidor de glucosa, requiriendo dos tercios del total de la glucosa circulante5; aunque hist&oacute;ricamente se consideraba al cerebro como un &oacute;rgano insulino independiente, en los &uacute;ltimos 20 a&ntilde;os, creciente evidencia cient&iacute;fica apoya el concepto de que la insulina lleva a cabo acciones importantes en el funcionamiento cerebral.&nbsp; La&nbsp; insulina&nbsp; producida&nbsp; en&nbsp; el&nbsp; p&aacute;ncreas atraviesa la barrera hemato-encef&aacute;lica&nbsp; a&nbsp; trav&eacute;s de un sistema de transporte&nbsp; saturable&nbsp; mediado por un receptor de insulina, aunque tambi&eacute;n existen reportes de producci&oacute;n de insulina en las c&eacute;lulas cerebrales6. Los receptores&nbsp; de&nbsp; insulina&nbsp; se encuentran ampliamente expresados en el cerebro pero con mayor densidad en la corteza cerebral, hipocampo, hipot&aacute;lamo y bulbo olfatorio7, y son diferentes en estructura y funci&oacute;n&nbsp;&nbsp;a los receptores de insulina en la periferia8. As&iacute; tenemos, que la insulina en el cerebro disminuye el apetito, mientras que en la periferia disminuye la glucosa y aumenta el apetito9. Tambi&eacute;n se ha demostrado expresi&oacute;n de glucotransportadores insulinodependientes en c&eacute;lulas cerebrales10. En el humano, la insulina cumple funciones cerebrales de aprendizaje y memoria, en especial memoria verbal11; estas funciones&nbsp; han&nbsp; sido&nbsp; soportadas&nbsp; por la evidencia que demuestra que la insulina modula la secreci&oacute;n de neurotransmisores como la acetilcolina12&nbsp; y favorece la plasticidad sin&aacute;ptica13.    <br>    &nbsp;    <br>    <span style="font-weight: bold;">INSULINORRESISTENCIA Y ENFER- MEDAD DE ALZHEIMER</span>    <br>        ]]></body>
<body><![CDATA[<br>    Normalmente la insulina inicia sus efectos celulares al unirse al receptor de insulina (RI) ubicado en la superficie celular, lo que desencadena la actividad de la tirosin kinasa que fosforila los miembros de una familia de 4 prote&iacute;nas, denominadas sustrato del receptor de insulina (SRI 1-SRI 4). Una vez fosforilado en el residuo tirosina (pTir) se acoplan RI-SRI desencadenando una cascada de reacciones que permiten la reprogramaci&oacute;n metab&oacute;lica y transcripcional de la c&eacute;lula14.    <br>        <br>    En los estados de estr&eacute;s metab&oacute;lico y proinflamatorio como la DM, el factor de necrosis tumoral alfa (FNT&alpha;), citoquina proinflamatoria, permite la activaci&oacute;n aberrante de la c-Jun-N terminal kinasa (JNK) quien fosforila el SRI 1 en el residuo serina (pSer), impidiendo el acoplamiento RI-SRI y de esta manera bloqueando la cascada de se&ntilde;alizaci&oacute;n de insulina, causando IR perif&eacute;rica14. A la EA se le ha denominado diabetes tipo 3 o forma cerebral de la diabetes, debido a la similitud que se ha encontrado entre los mecanismos de IR perif&eacute;rica que conllevan a DM tipo 2 (DM 2) y la alteraci&oacute;n de la se&ntilde;alizaci&oacute;n de la insulina cerebral observada en la EA15.    <br>        <br>  El estudio de Rotterdam16 fue el primero en sugerir que sujetos con DM 2 ten&iacute;an mayor riesgo de desarrollar EA; esta misma conclusi&oacute;n se obtuvo tanto en el estudio asi&aacute;tico de envejecimiento17, como en el metan&aacute;lisis de estudios epidemiol&oacute;gicos que evaluaron el riesgo de desarrollar EA en sujetos diab&eacute;ticos18. Numerosos son los potenciales mecanismos etiopatog&eacute;nicos involucrados en el desarrollo de demencia en la DM 2 adem&aacute;s de la IR, como son hiperglucemia cr&oacute;nica, estr&eacute;s oxidativo, ac&uacute;mulo de productos finales de la glicosilaci&oacute;n avanzada, aumento de citoquinas proinflamatorias y enfermedad microvascular cerebral19. La contribuci&oacute;n de esta &uacute;ltima en la progresi&oacute;n de la&nbsp; EA ha sido reconocida desde hace muchos a&ntilde;os en los estudios post morten, en los que m&uacute;ltiples lesiones isqu&eacute;micas se han observado en las placas neur&iacute;ticas t&iacute;picas de la EA20. Adicionalmente un cuerpo creciente de evidencia sugiere que la IR puede jugar un rol importante en el desarrollo&nbsp;&nbsp;de la EA independientemente de los niveles de glucemia en la sangre perif&eacute;rica, como ha sido reportado en algunos estudios longitudinales21,22. Recientemente, Talbot y col23 mostraron una disminuci&oacute;n de la se&ntilde;alizaci&oacute;n de insulina en&nbsp; cortes de hipocampo de pacientes fallecidos con EA,&nbsp; lo cual constituye la primera evidencia de IR en cerebro humano. En este estudio se muestra como luego de incubar los cortes de cerebro en diferentes concentraciones de insulina, por t&eacute;cnicas de inmunoprecipitaci&oacute;n, se observa una disminuci&oacute;n del efecto de la insulina sobre la fosforilaci&oacute;n en diferentes etapas de la v&iacute;a de se&ntilde;alizaci&oacute;n (IRS-1 pY, IRS-1 pS, PI3K p85&alpha; unida a IRS, Akt 1pS) en los sujetos con EA cuando se compara con sujetos sin la enfermedad.    <br>        <br>    As&iacute;, se ha propuesto a la IR como inductora de una serie de cambios en los mecanismos moleculares que dan origen a alteraciones en la s&iacute;ntesis y degradaci&oacute;n de A&beta;, hiperfosforilaci&oacute;n de la prote&iacute;na TAU, incremento del estr&eacute;s oxidativo y producci&oacute;n de neuroinflamaci&oacute;n, que en conjunto conducen a la neurodegeneraci&oacute;n y muerte celular observada en la EA24 (<a href="#Fig._1._">Figura 1</a>). Lo atractivo de esta hip&oacute;tesis metab&oacute;lica/IR cerebral es que puede explicar casi todas las&nbsp; alteraciones&nbsp; observadas en la EA, permitiendo que la responsabilidad del da&ntilde;o neuronal no repose exclusivamente sobre las placas neur&iacute;ticas de A&beta; y los ovillos de prote&iacute;na TAU hiperfosforilada como tradicionalmente se ha propuesto.    <br>        <br>    <span style="font-weight: bold;"><a name="Fig._1._"></a>Fig. 1</span>. Esquema modificado de Son S, Shin HJ and Mook-Jung I. Insulin Resistance and Alzheimer&rsquo;s Desease. In: Zimering Edited. Topics in the prevention, treatment and complications in type 2 diabetes24.    <br>       ]]></body>
<body><![CDATA[<br>   </font>     <div style="text-align: center;"><font size="-1"><img style="width: 777px; height: 394px;" alt="" src="/img/fbpe/rvdem/v15n1/art03fig1.jpg"></font>    
<br>   </div>   <font size="-1">     <br>    PPA: Precursor de la Proteina Amiloide. GSK 3&beta;: Kinasa de la Gluc&oacute;geno Sintetasa 3 beta. ROS: Especies Ox&iacute;geno Reactivas. RNS: Especies Nitr&oacute;geno Reactivo. &beta;A: Beta Amiloide.    <br>        <br>    IL 1&beta;: Interleuquina 1 beta. IL 6: Interleuquina 6. FNT &alpha;: Factor de Necrosis Tumoral alfa.    <br>        <br>    El rol de la IR como causa y consecuencia de las alteraciones observadas en la EA, ha adquirido gran inter&eacute;s en los &uacute;ltimos a&ntilde;os. Parece existir una relaci&oacute;n rec&iacute;proca entre ambas, ya que por una parte, el concepto de que la toxicidad de A&beta; causa IR est&aacute; soportado por el estudio de Bomfim y col25 quienes demostraron que tanto en cultivos de neuronas de hipocampo, como la administraci&oacute;n intraventricular en monos de olig&oacute;meros de A&beta; (O A&beta;), sinaptotoxina que se acumula en el cerebro de sujetos con EA desde etapas tempranas de la enfermedad, activan la v&iacute;a TNF&alpha;/JNK que inducen la fosforilaci&oacute;n SRI-pSer inhibiendo la v&iacute;a fisiol&oacute;gica SRI-pTir. Por otra parte, el argumento opuesto en el que la IR cerebral origina alteraciones en el procesamiento y degradaci&oacute;n de A&beta;, ha sido cient&iacute;ficamente soportada en el estudio de Ho y col26 en el que la alimentaci&oacute;n de ratones transg&eacute;nicos con modelo de EA, con una dieta alta&nbsp;&nbsp;&nbsp; en grasas inductora de IR mostr&oacute; un incremento en la cantidad de placas neur&iacute;ticas&nbsp; asociada&nbsp; a una disminuci&oacute;n de la actividad inhibitoria de la v&iacute;a fisiol&oacute;gica de la insulina sobre la gluc&oacute;geno sintetasa 3 kinasa alfa, que ha sido relacionada con la generaci&oacute;n de A&beta;27.    <br>    &nbsp;    <br>    <span style="font-weight: bold;">DIAGN&Oacute;STICO DE LA ENFERMEDAD DE ALZHEIMER</span>    ]]></body>
<body><![CDATA[<br>        <br>    El diagn&oacute;stico actual de la EA es eminentemente cl&iacute;nico y se hace con base en los criterios especificados en el Manual Diagn&oacute;stico y Estad&iacute;stico de los Trastornos&nbsp; Mentales&nbsp; (DSM-IV&nbsp; TR)&nbsp; de&nbsp; la Asociaci&oacute;n Psiqui&aacute;trica Americana28, y en la Clasificaci&oacute;n Internacional de Enfermedades (CIE-10) de la Organizaci&oacute;n Mundial de la Sa- lud29. El DSM-IV TR considera que se est&aacute; frente a una demencia cuando hay: 1) deterioro de la memoria a corto y largo plazo; 2) presencia&nbsp;&nbsp;&nbsp; de alg&uacute;n trastorno cognitivo (afasia, agnosia o alguna alteraci&oacute;n en la funci&oacute;n de ejecuci&oacute;n);&nbsp; y 3) deterioro de la actividad social y ocupacional subsecuente a los puntos 1 y 2, que no deben aparecer exclusivamente durante el curso de un estado confusional (delirium)28,29.    <br>        <br>    M&aacute;s recientemente se ha considerado la inclusi&oacute;n de estudios adicionales a los criterios cl&iacute;nicos,como evaluaci&oacute;n gen&eacute;tica, biomarcadores y neuro-im&aacute;genes, los cuales puedan proporcionar mayor precisi&oacute;n diagn&oacute;stica30, aunque el diagn&oacute;stico definitivo de la EA contin&uacute;a siendo el examen histopatol&oacute;gico post-morten. Los biomarcadores usualmente utilizados para diagn&oacute;stico de EA y para establecer la progresi&oacute;n de deterioro mental incipiente (DCI) a EA son los niveles en l&iacute;quido cefalorraqu&iacute;deo (LCR) de A&beta;-42, TAU total y fosfo-TAU31,32; su sensibilidad y especificidad diagn&oacute;stica en algunos estudios es del 85%31,33, sin embargo, no son pruebas estandarizadas y para otros autores no son suficientes. Dado el amplio espectro de anormalidades que preceden o acompa&ntilde;an la presentaci&oacute;n de la EA, se propone la inclusi&oacute;n de un panel de biomarcadores donde est&eacute;n representados la mayor parte de los factores de riesgo, no obstante, el mayor desaf&iacute;o es la se- lecci&oacute;n de cuales marcadores incluir de&nbsp;forma que costo/beneficio justifique su utilizaci&oacute;n34. Biomarcadores en sangre perif&eacute;rica albergan al- guna promesa como herramienta de pesquisa no invasiva35.    <br>        <br>    No hay duda del enorme progreso que se ha logrado en la detecci&oacute;n de neurodegeneraci&oacute;n&nbsp; con la aplicaci&oacute;n de herramientas no invasivas, especialmente con el uso de neuroim&aacute;genes funcionales, las cuales han mostrado patrones de actividad cerebral aberrantes en personas de alto riesgo de EA. Entre las neuroim&aacute;genes utilizadas est&aacute;n: Resonancia magn&eacute;tica convencional (RM), Resonancia magn&eacute;tica funcional (RMf), Resonancia magn&eacute;tica con tensor de difusi&oacute;n (RMTD), Tomograf&iacute;a computarizada con emisi&oacute;n de positrones simple (PET) y Tomograf&iacute;a con emisi&oacute;n&nbsp; de positrones con 18 fluorodeoxiglucosa (FDG- PET)36.    <br>        <br>    En poblaciones a riesgo de EA como portadores de Apo E4 se ha reportado reducido metabolismo de la glucosa y/o reducida conectividad en estado de reposo en la red en modo autom&aacute;tico (MA)&nbsp; del cerebro, antes de que el declive funcional sea evidente36. La red en MA, que incluye la corteza cingulada posterior y temporoparietal posterior asociadas a la regi&oacute;n cortical del cerebro, es m&aacute;s activa en estado de reposo y se desactiva&nbsp; durante    <br>        <br>    la funci&oacute;n cognitiva. Musen y col37 compararon&nbsp; el cerebro de sujetos con DM 2 con el de no diab&eacute;ticos utilizando RMf y encontraron que los sujetos diab&eacute;ticos ten&iacute;an una reducida conectividad en estado de reposo en la red MA comparada con los controles no diab&eacute;ticos, mientras que no se encontr&oacute; diferencia entre los grupos de estudio en lo relativo a estructura cerebral o desempe&ntilde;o cognitivo. Estos resultados son concordantes con los obtenidos en sujetos portadores de apo E4, donde las alteraciones observadas en las neuroim&aacute;genes funcionales preceden al deterioro cognitivo o estructural cerebral.    ]]></body>
<body><![CDATA[<br>        <br>    El estudio de Hoogenboom y col38 utilizando RMTD mostr&oacute; alteraci&oacute;n de la integridad de la materia blanca del haz cingulado y tendencia a diferencia en los fasc&iacute;culos uncinado y longitudinal superior en sujetos diab&eacute;ticos al compararlos con controles.    <br>    &nbsp;    <br>    <span style="font-weight: bold;">TRATAMIENTO</span>    <br>        <br>    <span style="font-weight: bold;">Cambios en el estilo de vida:</span>Ajustes en el estilo de vida ser&iacute;a la forma m&aacute;s l&oacute;gica y costo efectiva de reducir la morbi-mortalidad por EA. Recientemente se evalu&oacute; el efecto de una dieta alta en grasas y alto &iacute;ndice gluc&eacute;mico comparada con el de una dieta baja en grasas y bajo &iacute;ndice gluc&eacute;mico administrada durante 4 semanas a un grupo de 49 sujetos, un grupo de adultos saluda- bles y otros con DCI; se encontr&oacute; que la dieta baja en grasas mejor&oacute; la memoria visual en ambos grupos mientras que la dieta alta en grasas increment&oacute; A&beta; en LCR de sujetos saludables, lo que sugiere que la dieta puede ser un poderoso factor ambiental que modula el riesgo de EA39. Por otra parte, un peque&ntilde;o estudio evalu&oacute; el efecto del ejercicio aer&oacute;bico&nbsp;intenso&nbsp; comparado con actividades de estiramiento realizados por un grupo de 33 participantes que incluy&oacute; mujeres y hombres con DCI, se evidenci&oacute; que el ejercicio aer&oacute;bico intenso ten&iacute;a efecto favorable especialmente en mujeres, donde se observ&oacute; mejor&iacute;a en el funcionamiento cognitivo as&iacute; como disminuci&oacute;n en los niveles de A&beta; en LCR40.    <br>    <br style="font-weight: bold;">    <span style="font-weight: bold;">Farmacoterapia:</span> El reconocimiento de las importantes funciones de la insulina en el cerebro y de la asociaci&oacute;n de alteraciones en la v&iacute;a de se&ntilde;alizaci&oacute;n de la insulina con la EA, ha motivado el reciente inter&eacute;s de evaluar los agentes terap&eacute;uticos originalmente desarrollados para tratar DM 2 como potenciales terapias en el manejo de la EA. A continuaci&oacute;n se revisar&aacute; el estado actual de la investigaci&oacute;n de algunos de estos f&aacute;rmacos.    <br>        <br>    <span style="font-weight: bold;">Metformina:</span> Es poco lo que se conoce sobre el efecto de la metformina en SNC. En estudios experimentales en roedores, se observa que atraviesa la barrera hemato-encef&aacute;lica y activa la AMPK en los tejidos cerebrales41, y en cultivos de c&eacute;lulas neuronales aumenta la sensibilidad a la insulina&nbsp;y previene las alteraciones&nbsp; patol&oacute;gicas&nbsp; t&iacute;picas&nbsp; de la EA42, sin embargo, se ha reportado que la metformina aumenta la generaci&oacute;n de A&beta; en l&iacute;neas celulares neuronales43. Estudios epidemiol&oacute;gicos44 y caso-control45 han mostrado resultados contradictorios en sujetos diab&eacute;ticos con EA recibiendo metformina. Actualmente se encuentran en desarrollo estudios cl&iacute;nicos identificados con los n&uacute;meros NCT00620191 y NCT01965756 con la esperanza de aclarar si la metformina puede ser de utilidad en el manejo de la EA.    <br>        ]]></body>
<body><![CDATA[<br>    Agonistas de los receptores activados por proliferadores de peroxisomas (PPARs): Los resultados con rosiglitazona no han sido uniformes, pues en un peque&ntilde;o estudio cl&iacute;nico realizado en sujetos&nbsp; no diab&eacute;ticos con criterios diagn&oacute;sticos de EA se preserv&oacute; el desempe&ntilde;o en las pruebas de memoria y atenci&oacute;n en relaci&oacute;n al placebo46, sin embargo, un estudio posterior encontr&oacute; que esta mejor&iacute;a estaba asociada a la presencia del alelo ApoE447. Otro estudio m&aacute;s reciente, report&oacute; el efecto de la rosiglitazona como negativo respecto a las funciones cognitivas48.    <br>        <br>    An&aacute;logos del p&eacute;ptido similar al glucag&oacute;n tipo 1 (GLP-1): Estudios experimentales con an&aacute;logos de la GLP-1 han mostrado resultados favorables. Inicialmente con exenatide se observ&oacute; una disminuci&oacute;n del ac&uacute;mulo de A&beta; y de la toxicidad celular en modelos animales de EA49; posteriormente, en ratones transg&eacute;nicos con modelo de EA, liraglutide previno alteraciones de la memoria, p&eacute;rdida de las sinapsis y deterioro de la plasticidad sin&aacute;ptica; tambi&eacute;n redujo ac&uacute;mulo de A&beta; la placa neur&iacute;tica e&nbsp;&nbsp; increment&oacute; la neurog&eacute;nesis en el hipocampo50, sin embargo, estos efectos no han sido demostrados en humanos.    <br>        <br>    <span style="font-weight: bold;">Insulina:</span> Los primeros reportes de estudios favorables de la utilizaci&oacute;n de la insulina sobre la funci&oacute;n cognitiva fueron utilizando infusiones endovenosas51, sin embargo, esta v&iacute;a ten&iacute;a limitaciones por el riesgo de hipoglucemia y adicionalmente porque el paso de la insulina desde&nbsp; la periferia al SNC es limitado. Los trabajos m&aacute;s recientes con el uso de insulina intranasal para el tratamiento de la EA han mostrado seguridad con su uso y resultados prometedores, el m&aacute;s notable de ellos es el de Craft y col52 quienes evaluaron 104 pacientes con DCI o EA en los que se administr&oacute; insulina intranasal diaria durante 4 meses, y en comparaci&oacute;n con placebo, aquellos que recibieron insulina mostraron mejor&iacute;a significativa de la memoria. A un subgrupo de pacientes se les realiz&oacute; FDG PET con hallazgos que apoyaron los resultados cl&iacute;nicos, y tambi&eacute;n biomarcadores en LCR, los cuales no mostraron diferencias entre los grupos de estudio, pero el an&aacute;lisis exploratorio posterior mostr&oacute; cambios en algunos cocientes.    <br>        <br>    Debido a estos resultados alentadores de la insulina intranasal a corto plazo, el NIH (National Institutes Health) patrocina un estudio que&nbsp; se&nbsp; est&aacute; llevando a cabo en la actualidad identificado como: &ldquo;Study of Nasal Insulin in the Fight Against Forgetfulness&rdquo; (SNIFF) NCT01767909, donde&nbsp; se evaluar&aacute; la eficacia de la insulina intranasal administrada a largo plazo (12 meses).    <br>    &nbsp;    <br>    <span style="font-weight: bold;">CONCLUSIONES</span>    <br>        ]]></body>
<body><![CDATA[<br>    Varios mecanismos pueden&nbsp; estar&nbsp; involucrados&nbsp; en el acelerado declive cognitivo y desarrollo de EA en los sujetos con IR o DM2, sin embargo,&nbsp; en este escrito solo se revisaron las anormalidades metab&oacute;licas y especialmente la IR. Producto de alteraciones en la v&iacute;a de se&ntilde;alizaci&oacute;n de la insulina se ocasiona un d&eacute;ficit en la utilizaci&oacute;n de la glucosa y del metabolismo energ&eacute;tico cerebral, favoreciendo procesos inflamatorios y oxidativos que promueven el da&ntilde;o estructural y funcional del cerebro, que unido a la enfermedad microvascular coexistente, tambi&eacute;n favorecida por la IR, contribuyen a la expresi&oacute;n neuropatol&oacute;gica de la EA. Afortunadamente se han realizado grandes avances en el diagn&oacute;stico de la EA, en gran medida gracias al desarrollo de las neuroim&aacute;genes funcionales y de algunos biomarcadores de la enfermedad; apesar de ello, el diagn&oacute;stico&nbsp; de&nbsp; EA contin&uacute;a siendo un&nbsp; desaf&iacute;o,&nbsp; especialmente en manos de los no especialistas en el &aacute;rea o de instituciones que no tengan acceso a los m&eacute;todos diagn&oacute;sticos m&aacute;s recientemente incorporados, unido al requerimiento, dada la naturaleza pro- gresiva de la EA, de largos intervalos de tiempo necesarios para demostrar los s&iacute;ntomas y signos de la enfermedad.    <br>        <br>    La prevenci&oacute;n deber&iacute;a ser el manejo ideal de esta patolog&iacute;a, sin embargo, el hecho de que varias funciones celulares est&eacute;n comprometidas, hace pensar que esta orientaci&oacute;n ser&aacute; multimodal, prestando atenci&oacute;n a los factores de riesgo modificables. En relaci&oacute;n a la terapia farmacol&oacute;gica, hay en este momento varios f&aacute;rmacos en evaluaci&oacute;n, en especial los aprobados para el control de DM 2 que act&uacute;an por el mecanismo de la v&iacute;a de se&ntilde;alizaci&oacute;n de la insulina. Sin duda, a&uacute;n se requieren muchas investigaciones que permitan consolidar los hallazgos hasta ahora encontrados, que finalmente conduzcan a la prevenci&oacute;n y tratamiento de esta incapacitante enfermedad.    <br>    &nbsp;    <br>    <span style="font-weight: bold;">REFERENCIAS BIBLIOGR&Aacute;FICAS</span>    <br>        <!-- ref --><br>    1.Organizaci&oacute;n Mundial de la Salud. Demencia. Abril 2016. Accesado en Junio 2016. Disponible en: www. who.int/mediacentre/factsheets/fs362/es.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3091080&pid=S1690-3110201700010000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><br>        <!-- ref --><br>    2.Jellinger KA. The neuropathological diagnosis of Alzheimer disease. J Neural Transm Suppl 1998;53:97- 118.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3091082&pid=S1690-3110201700010000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><br>        ]]></body>
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