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<front>
<journal-meta>
<journal-id>1889-836X</journal-id>
<journal-title><![CDATA[Revista de Osteoporosis y Metabolismo Mineral]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Osteoporos Metab Miner]]></abbrev-journal-title>
<issn>1889-836X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Española de Investigaciones Óseas y Metabolismo Mineral]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1889-836X2014000500003</article-id>
<article-id pub-id-type="doi">10.4321/S1889-836X2014000500003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acciones extraóseas de la vitamina D]]></article-title>
<article-title xml:lang="en"><![CDATA[Extraskeletal effects of vitamin D]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez de Tejada Romero]]></surname>
<given-names><![CDATA[M.J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Sevilla Departamento de Medicina ]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<volume>6</volume>
<fpage>11</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1889-836X2014000500003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1889-836X2014000500003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1889-836X2014000500003&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p>&nbsp;</p>     <p>&nbsp;</p> <a name="top"></a>    <p><font face="Verdana" size="4"><b>Acciones extra&oacute;seas de la vitamina D</b></font></p>     <p><font face="Verdana" size="4"><b>Extraskeletal effects of vitamin D</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>G&oacute;mez de Tejada Romero M.J.</b></font></p>     <p><font face="Verdana" size="2">Departamento de Medicina - Universidad de Sevilla</font></p>     <p><font face="Verdana" size="2"><a href="#bajo">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana" size="2">Desde que la vitamina D fue descubierta en 1922 como part&iacute;cipe de la mineralizaci&oacute;n &oacute;sea y responsable del raquitismo por McCollum &#091;1&#093;, muchos nuevos conocimientos sobre ella han tenido lugar. De ser vitamina pas&oacute; a ser considerada como hormona &#091;2&#093;, y junto con la parathormona y la calcitonina constituyen el grupo de hormonas calciotropas: su importante papel en la homeostasis del calcio y su acci&oacute;n directa sobre el tejido &oacute;seo han hecho que sea objeto de investigaci&oacute;n constante en el estudio del metabolismo mineral.</font></p>     <p><font face="Verdana" size="2">Sin embargo, se han detectado receptores para la vitamina D (VDR) en casi todos los tejidos humanos, y descubierto su capacidad de regulaci&oacute;n de la expresi&oacute;n de numerosos genes &#091;3&#093;. Un ensayo cl&iacute;nico aleatorizado, doble ciego, recientemente publicado y realizado en 6 sujetos durante el invierno para ver el efecto de los suplementos de vitamina D durante 2 meses en la expresi&oacute;n gen&oacute;mica, obtuvo que, en el momento inicial del estudio hubo una diferencia significativa en la expresi&oacute;n de 66 genes entre los sujetos con deficiencia de vitamina D (&lt;20 ng/ml) y aqu&eacute;llos con niveles iniciales &gt;20 ng/ml. Tras 2 meses con suplemento de vitamina D la expresi&oacute;n gen&eacute;tica de esos 66 genes fue similar en ambos grupos. Adem&aacute;s, se identificaron 17 genes regulados por la vitamina D como nuevos candidatos a la respuesta a la vitamina D, los cuales han mostrado ser importantes para la regulaci&oacute;n de la transcripci&oacute;n gen&eacute;tica, la funci&oacute;n inmune, la respuesta al estr&eacute;s y la reparaci&oacute;n del DNA &#091;4&#093;.</font></p>     <p><font face="Verdana" size="2">Esto hizo pensar que la vitamina D tiene su efecto hormonal m&aacute;s all&aacute; del hueso, y poco a poco se ha ido concediendo a la vitamina D un papel relevante en la fisiolog&iacute;a humana en general &#091;5,6&#093;.</font></p>     <p><font face="Verdana" size="2">Numerosos estudios se han realizado a lo largo de los a&ntilde;os para poner en evidencia esas acciones extra&oacute;seas, siendo las m&aacute;s relevantes las que tienen lugar en el m&uacute;sculo, el c&aacute;ncer, el metabolismo de la glucosa y el sistema inmune, que son las que analizaremos en esta revisi&oacute;n.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Vitamina D y actividad muscular</b></font></p>     <p><font face="Verdana" size="2">La intervenci&oacute;n de la vitamina D en la funci&oacute;n muscular es conocida desde hace muchos a&ntilde;os y ha sido ampliamente estudiada. Desde hace tiempo se ha observado que la deficiencia de vitamina D lleva a una miopat&iacute;a caracterizada por debilidad muscular proximal y atrofia &#091;7&#093;, y la presencia de VDR en el tejido muscular esquel&eacute;tico ha sido evidenciada en diversos estudios &#091;8-10&#093;, observ&aacute;ndose un descenso de los receptores con la edad &#091;11&#093;.</font></p>     <p><font face="Verdana" size="2">La vitamina D regula el desarrollo muscular y la contractilidad, y ello lo realiza a trav&eacute;s de acciones gen&oacute;micas, estimulando la proliferaci&oacute;n de c&eacute;lulas musculares y su diferenciaci&oacute;n a trav&eacute;s de la transcripci&oacute;n, mediada por receptores espec&iacute;ficos nucleares, de genes que expresan un aumento de la s&iacute;ntesis de ADN celular, seguido de la inducci&oacute;n de prote&iacute;nas musculares espec&iacute;ficas (prote&iacute;nas de uni&oacute;n al calcio y a la miosina). Pero tambi&eacute;n ejerce acciones no gen&oacute;micas, interactuando con el receptor espec&iacute;fico de membrana de la c&eacute;lula muscular, lo cual lleva a la estimulaci&oacute;n de la adenil-ciclasa y las fosfolipasas C, D y A2, y a la activaci&oacute;n de v&iacute;as de se&ntilde;alizaci&oacute;n intracelulares, como la cascada MAPK (<i>Mitogen-activated protein kinase</i>), que termina actuando sobre el ADN e induciendo la divisi&oacute;n celular &#091;12,13&#093;. En un estudio recientemente publicado, los autores observaron que ratones reci&eacute;n nacidos de madres con deficiencia de vitamina D ten&iacute;an sus c&eacute;lulas musculares m&aacute;s peque&ntilde;as que las de los ratones cuyas madres ten&iacute;an niveles adecuados &#091;14&#093;.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Sin embargo, hay que decir que la existencia de VDR en las c&eacute;lulas musculares es cuestionada por algunos autores; en un estudio realizado por Wang y cols. no se pudieron detectar VDR en c&eacute;lulas musculares de rat&oacute;n y, se observ&oacute; que los anticuerpos utilizados en estudios anteriores para detectar los VDR no son espec&iacute;ficos para estos receptores, lo que podr&iacute;a explicar los resultados potencialmente falsos positivos en estudios anteriores. Los autores concluyen que el efecto que realiza la vitamina D sobre el m&uacute;sculo debe ser indirecto &#091;15&#093;. Sin embargo, algunos autores consideran que estos hallazgos pueden ser debidos a diferencias en las condiciones experimentales y a la posible existencia de una estrecha uni&oacute;n del VDR al elemento de respuesta hormonal espec&iacute;fico del ADN una vez acoplado a la vitamina D &#091;16&#093;. De todas formas, una peque&ntilde;a presencia de VDR en el m&uacute;sculo puede ser suficiente para permitir la acci&oacute;n de la vitamina D en estas c&eacute;lulas. Otra posibilidad es que pueden haber diferencias en la expresi&oacute;n de VDR en el m&uacute;sculo en diferentes especies y a lo largo de las diversas etapas de la diferenciaci&oacute;n muscular &#091;17&#093;. Por &uacute;ltimo, algunos investigadores han sugerido que, aparte del VDR espec&iacute;fico, es posible que otros receptores citoplasm&aacute;ticos (tales como los esteroideos, dada su similitud molecular) puedan ser responsables de las acciones r&aacute;pidas de los metabolitos de la vitamina D en el m&uacute;sculo &#091;18&#093;.</font></p>     <p><font face="Verdana" size="2">En base a esto, es f&aacute;cil entender que la vitamina D tenga un importante papel en la actividad muscular &#091;19&#093;. Como indicamos al principio, diversos estudios vienen demostrando ya desde hace tiempo que el d&eacute;ficit de vitamina D se asocia a mialgia difusa, debilidad muscular &#091;20,21&#093; y sarcopenia, todo causado por la atrofia muscular principalmente de fibras musculares de tipo II, y afectando sobre todo a la musculatura proximal &#091;22,23&#093;. Para conocer la relaci&oacute;n entre los niveles de vitamina D con el riesgo de ca&iacute;da y la debilidad muscular, Stewart y cols. realizaron un estudio en 242 mujeres postmenop&aacute;usicas sanas. Para ello, se busc&oacute; correlaci&oacute;n con algunos indicadores de buena salud f&iacute;sica, como la masa grasa androide, la masa magra corporal, el equilibrio y la fuerza de cierre manual, la fuerza del torso y la fuerza del miembro inferior. Obtuvieron que los niveles de vitamina D estaban correlacionados con todos, excepto con la fuerza del torso y del miembro inferior, concluyendo que los niveles de vitamina D pueden ser un contribuyente a los &iacute;ndices de salud f&iacute;sica en las mujeres postmenop&aacute;usicas sanas &#091;24&#093;.</font></p>     <p><font face="Verdana" size="2">Por otro lado y en consonancia con lo anteriormente dicho, diversos estudios han demostrado que los suplementos de vitamina D mejoran considerablemente la fuerza muscular, especialmente en la poblaci&oacute;n anciana con hipovitaminosis. Bunout y cols. valoraron los efectos del entrenamiento de resistencia y el aporte de suplementos de vitamina D en la forma f&iacute;sica de 96 ancianos sanos con bajos niveles de vitamina D, concluyendo que la adici&oacute;n de &eacute;sta mejor&oacute; la velocidad de marcha y la estabilidad, mientras que el entrenamiento mejor&oacute; la fuerza muscular &#091;25&#093;. En un estudio aleatorizado y controlado con placebo, realizado en sujetos ambulatorios mayores de 65 a&ntilde;os con historia de ca&iacute;das e hipovitaminosis, y cuyo objetivo fue ver el efecto sobre la funci&oacute;n f&iacute;sica y muscular de un suplemento de vitamina D (ergocalciferol) administrado en una &uacute;nica dosis intramuscular de 600.000 UI, los autores obtuvieron como resultado que, a los 6 meses, los sujetos que recibieron el suplemento de vitamina D tuvieron beneficios significativos en el funcionamiento f&iacute;sico, el tiempo de reacci&oacute;n y el equilibrio, aunque no en la fuerza muscular &#091;26&#093;. En un estudio de Bischoff-Ferrari y cols., los autores demuestran que la vitamina D con calcio mejora el equilibrio postural y el din&aacute;mico de las ancianas institucionalizadas &#091;27&#093;. Moreira-Pfrimer y cols. estudiaron la fuerza muscular en 46 sujetos institucionalizados de &ge;65 a&ntilde;os de edad, a los que se les administr&oacute; durante 6 meses de forma aleatoria, o calcio diario m&aacute;s placebo, o calcio diario m&aacute;s vitamina D. Al final del estudio, y en ausencia de pr&aacute;ctica de ejercicio f&iacute;sico, la fuerza de los flexores de cadera aument&oacute; en el grupo que recibi&oacute; vitamina D un 16,4% (p=0,0001), y la fuerza de los extensores de la rodilla lo hizo un 24,6% (p=0,0007) &#091;28&#093;.</font></p>     <p><font face="Verdana" size="2">No obstante, hay estudios que concluyen que en los ancianos sanos los suplementos de vitamina D no previene el descenso de la fuerza muscular debido a la involuci&oacute;n por la edad &#091;29,30&#093;. En una revisi&oacute;n realizada por Annweiler y cols., los resultados acerca de la asociaci&oacute;n de la vitamina D y el funcionamiento f&iacute;sico fueron controvertidos &#091;31&#093;, aunque un metaan&aacute;lisis m&aacute;s reciente concluye que los suplementos de vitamina D a dosis diarias de 800 a 1.000 UI han demostrado tener efectos beneficiosos sobre la fuerza muscular y el equilibrio de los ancianos &#091;32&#093;.</font></p>     <p><font face="Verdana" size="2">La debilidad muscular asociada a la hipovitaminosis D, si sobrepasa un determinado l&iacute;mite, puede afectar a la capacidad funcional y a la movilidad, lo cual sit&uacute;a especialmente a las personas ancianas en mayor riesgo de ca&iacute;da y, por tanto, de fractura &#091;26,30&#093;. Un estudio realizado en mujeres ancianas institucionalizadas mostr&oacute; que las mujeres que tomaron calcio y vitamina D durante 3 meses tuvieron una reducci&oacute;n del riesgo de ca&iacute;da del 49% respecto a aqu&eacute;llas que s&oacute;lo tomaron calcio, y su funci&oacute;n musculoesquel&eacute;tica mejor&oacute; significativamente (p=0,0094) &#091;33&#093;. Semejantes resultados fueron obtenidos por Pfeifer y cols. en un estudio realizado en ancianos de ambos sexos &#091;34&#093;. Respecto al efecto sobre las ca&iacute;das de los suplementos de vitamina D, en un estudio de dosis m&uacute;ltiples aleatorizado y controlado con placebo, se demostr&oacute; que la administraci&oacute;n de 800 UI/d&iacute;a de vitamina D durante m&aacute;s de 5 meses redujo la proporci&oacute;n de la tasa ajustada-incidencia de ca&iacute;das un 72% &#091;35&#093;. Varios meta-an&aacute;lisis publicados en los &uacute;ltimos a&ntilde;os indican que los suplementos de vitamina D reducen el riesgo de ca&iacute;da en los ancianos &#091;36&#093;; uno de ellos, realizado por Bischoff-Ferrari y cols. con 8 ensayos aletorizados y controlados con placebo (n=2.426), mostr&oacute; que los suplementos de vitamina D a dosis de 700 a 1.000 UI/d&iacute;a, o unos valores s&eacute;ricos de vitamina D &ge;24 ng/ml, reducen el riesgo de ca&iacute;das en un 19% y 23%, respectivamente. No se observ&oacute; ning&uacute;n beneficio con dosis de suplemento inferiores o concentraciones en suero de vitamina D inferiores a las indicadas &#091;37&#093;. Esto mismo es corroborado en una revisi&oacute;n de la Cochrane realizada en 2009 por Gillespie y cols., quienes observan que los suplementos de vitamina D no reducen el riesgo de ca&iacute;da (RR=0,96; IC 95%: 0,92-1,01), pero indican que pueden hacerlo en personas con bajos niveles s&eacute;ricos de vitamina D &#091;38&#093;. En otra revisi&oacute;n se concluy&oacute; que dichos suplementos reducen la tasa de ca&iacute;da (rate ratio RaR=0,72; IC 95%: 0,55-0,95) pero no el riesgo de ca&iacute;da (<i>risk ratio</i> RR=0,98; IC 95%: 0,89-1,09) &#091;39&#093;. En una revisi&oacute;n sistem&aacute;tica acompa&ntilde;ada de un metaan&aacute;lisis realizado por Kalyani y cols., los autores obtuvieron como resultado que los suplementos de vitamina D reducen con efectividad el riesgo de ca&iacute;da en la poblaci&oacute;n anciana &#091;40&#093;.</font></p>     <p><font face="Verdana" size="2">En conclusi&oacute;n, hay evidencias de que el m&uacute;sculo responde a la vitamina D &#091;16&#093;, lo cual debe ser aliciente para que se realicen estudios sobre su potencial terap&eacute;utico en patolog&iacute;as musculares. Adem&aacute;s, son suficientes para recomendar que los cl&iacute;nicos tengan en cuenta la observaci&oacute;n de los niveles de vitamina D en pacientes con trastornos musculares.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Vitamina D y c&aacute;ncer</b></font></p>     <p><font face="Verdana" size="2">La primera publicaci&oacute;n sobre la asociaci&oacute;n entre la exposici&oacute;n solar y la reducci&oacute;n de la mortalidad por c&aacute;ncer en EE.UU. fue realizada en 1941 por Apperly &#091;41&#093;. M&aacute;s tarde, en 1980, los hermanos Garland propusieron la hip&oacute;tesis de que la vitamina D es un protector del c&aacute;ncer de colon &#091;42&#093;. Desde entonces, muchos han sido los estudios epidemiol&oacute;gicos encaminados a evidenciar esta relaci&oacute;n, as&iacute; como con otros tipos de c&aacute;ncer, mostrando la mayor&iacute;a hallazgos positivos. Una revisi&oacute;n sistem&aacute;tica reciente realizada por Grant encontr&oacute; una fuerte correlaci&oacute;n inversa entre la exposici&oacute;n solar-vitamina D y la aparici&oacute;n de 15 distintos tipos de c&aacute;nceres: vesical, de mama, uterino, de colon, endometrial, esof&aacute;gico, g&aacute;strico, pulmonar, ov&aacute;rico, pancre&aacute;tico, rectal, renal, vulvar, y linfomas de Hodgkin y no-Hodgkin &#091;43&#093;. Lappe y cols., en un ensayo cl&iacute;nico aleatorizado, a doble ciego y controlado con placebo, realizado en 1.179 mujeres postmenop&aacute;usicas a las que asignaron un tratamiento con calcio solo, o calcio y vitamina D o placebo, obtuvieron que mejoras en el estado nutricional del calcio y la vitamina D reducen el riesgo de sufrir cualquier tipo de cancer &#091;44&#093;.</font></p>     <p><font face="Verdana" size="2">En otra revisi&oacute;n sistem&aacute;tica m&aacute;s reciente, van der Rhee y cols. &#091;45&#093; obtuvieron que casi todos los estudios epidemiol&oacute;gicos revisados sugieren que la exposici&oacute;n cr&oacute;nica al sol (no intermitente) se asocia con un riesgo reducido de c&aacute;ncer colorrectal, de mama, de pr&oacute;stata y linfoma no Hodgkin. En el c&aacute;ncer colorrectal -y en menor grado en el de mama- los niveles de vitamina D se asociaron inversamente con el riesgo de c&aacute;ncer, no as&iacute; en el de pr&oacute;stata y el linfoma no Hodgkin. Otros estudios casos-controles, retrospectivos y prospectivos, no obstante, han demostrado esta asociaci&oacute;n inversa en los cuatro tipos de c&aacute;nceres, de colon, pr&oacute;stata, mama y linfoma no Hodgkin &#091;46-52&#093; aunque un estudio recientemente publicado no obtuvo asociaci&oacute;n en el caso del c&aacute;ncer de pr&oacute;stata &#091;53&#093;.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La vitamina D y sus an&aacute;logos inhiben la proliferaci&oacute;n, la angiog&eacute;nesis, la migraci&oacute;n y la invasi&oacute;n de las l&iacute;neas celulares malignas de los c&aacute;nceres de colon, pr&oacute;stata y mama, e inducen su diferenciaci&oacute;n y apoptosis &#091;54,55&#093;. Adem&aacute;s, la s&iacute;ntesis de prostaglandinas y la v&iacute;a de se&ntilde;alizaci&oacute;n Wnt/beta catenina est&aacute;n tambi&eacute;n influenciadas por la vitamina D, que suprime la expresi&oacute;n COX-2 y aumenta la de 15-PGDH, reduciendo de ese modo los niveles de prostaglandinas inflamatorias. Se regula as&iacute; el metabolismo y la se&ntilde;alizaci&oacute;n de las prostaglandinas, disminuyendo de este modo la promoci&oacute;n de la carcinog&eacute;nesis mediada por ellas. Este efecto sobre la s&iacute;ntesis de las prostaglandinas tambi&eacute;n da lugar a una supresi&oacute;n de la angiog&eacute;nesis tumoral, mediante la regulaci&oacute;n de la expresi&oacute;n de factores cruciales que la controlan &#091;56,57&#093;. La vitamina D tambi&eacute;n regula la se&ntilde;alizaci&oacute;n de los receptores androg&eacute;nicos y estrog&eacute;nicos, y de este modo inhibe el crecimiento tumoral de algunos tumores dependientes de estas hormonas, como son el de pr&oacute;stata y el de mama, reduciendo tambi&eacute;n en &eacute;ste &uacute;ltimo la expresi&oacute;n de aromatasa, lo que contribuye a la inhibici&oacute;n de su crecimiento &#091;58,59&#093;.</font></p>     <p><font face="Verdana" size="2">Los estudios de asociaci&oacute;n tienen ciertas limitaciones en cuanto al establecimiento de una relaci&oacute;n de causalidad entre el estado de vitamina D y un riesgo reducido de c&aacute;ncer; por ejemplo, los niveles bajos de vitamina D tambi&eacute;n est&aacute;n vinculados con factores de confusi&oacute;n relacionados con mayor riesgo de c&aacute;ncer, como la obesidad (como veremos despu&eacute;s, la vitamina D es &quot;retenida&quot; en el tejido adiposo) y la falta de actividad f&iacute;sica (correlacionada con menos tiempo al aire libre y menor exposici&oacute;n solar) &#091;50&#093;. Sin embargo, un estudio a doble ciego, aleatorizado y controlado con placebo, de 4 a&ntilde;os de duraci&oacute;n, realizado con m&aacute;s de mil mujeres postmenop&aacute;usicas, cuyo principal objetivo secundario fue la incidencia de c&aacute;ncer, mostr&oacute; que la administraci&oacute;n de suplementos de calcio (1.400-1.500 mg/d&iacute;a) y vitamina D (1.100 UI/d&iacute;a) redujo el riesgo relativo de c&aacute;ncer aproximadamente un 60% (p&lt;0,01). La repetici&oacute;n de un an&aacute;lisis de la supervivencia libre de c&aacute;ncer despu&eacute;s de los primeros 12 meses revel&oacute; que el riesgo relativo para el grupo de calcio y vitamina D se redujo aproximadamente un 77% (IC 95%: 0,09-0,60; p&lt;0,005). Modelos de regresi&oacute;n m&uacute;ltiple tambi&eacute;n mostraron que el tratamiento y la concentraci&oacute;n s&eacute;rica de vitamina D fueron importantes predictores independientes del riesgo de c&aacute;ncer &#091;44&#093;.</font></p>     <p><font face="Verdana" size="2">Evidentemente, los estudios que relacionan la deficiencia de vitamina D con el riesgo de c&aacute;ncer no demuestran que se trate de una relaci&oacute;n de casualidad. Son necesarios m&aacute;s ensayos cl&iacute;nicos dirigidos espec&iacute;ficamente a ver los efectos de los suplementos de vitamina D en el desarrollo neopl&aacute;sico, y si el mantenimiento de unos niveles adecuados de vitamina D puede ser una medida preventiva eficaz.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Vitamina D y enfermedades metab&oacute;licas: diabetes y obesidad</b></font></p>     <p><font face="Verdana" size="2">La hip&oacute;tesis de que la vitamina D puede ser relevante en el riesgo de diabetes es consistente, dados los numerosos estudios que han demostrado una asociaci&oacute;n inversa entre la deficiencia de vitamina D y la enfermedad, especialmente la tipo 2. Un metaan&aacute;lisis realizado para observar la asociaci&oacute;n entre el estado de la vitamina D o su suplemento y la incidencia de diabetes tipo 2 mostr&oacute; que los sujetos con niveles de la hormona &gt;25 ng/ml, comparados con los que ten&iacute;an niveles &lt;14 ng/ml, ten&iacute;an un riesgo de desarrollar diabetes tipo 2 un 43% m&aacute;s bajo, y que un suplemento de vitamina D diario superior a 500 UI, comparado con uno de &lt;200 UI/d&iacute;a redujo el riesgo un 13% &#091;60&#093;. Otro realizado por George y cols. concluy&oacute;, sin embargo, que no hay evidencias suficientes sobre el efecto beneficioso para recomendar suplementos de vitamina D como medida de mejora de la glucemia o la resistencia a la insulina en pacientes con diabetes &#091;61&#093;. Song y cols. han publicado otro m&aacute;s recientemente en el que concluyen que hay una reducci&oacute;n del 38% del riesgo de sufrir diabetes tipo 2 entre las personas con niveles m&aacute;s altos de vitamina D respecto a las de niveles m&aacute;s bajos (RR=0,62; 95% CI, 0,54-0,70) &#091;62&#093;. En el  <i>Nurses' Health Study</i> se realiz&oacute; un seguimiento a m&aacute;s de 83.000 mujeres y se observ&oacute; que una ingesta diaria &gt;1.200 mg de calcio m&aacute;s suplemento de vitamina D &gt;800 UI se asoci&oacute; a un menor riesgo (33%) de padecer diabetes tipo 2 (RR=0,67; IC 95%: 0,49-0,90), comparado con una ingesta de calcio &lt;600 mg m&aacute;s 400 UI de vitamina D &#091;63&#093;. Un estudio prospectivo de seguimiento a m&aacute;s de 2.000 participantes mostr&oacute; que el riesgo de progresi&oacute;n de prediabetes a diabetes fue un 62% menor cuando se compar&oacute; a aquellos con niveles de vitamina D en el cuartil m&aacute;s alto frente a los que ten&iacute;an niveles en el cuartil m&aacute;s bajo &#091;64&#093;.</font></p>     <p><font face="Verdana" size="2">Esto podr&iacute;a ser explicado por los hallazgos que indican que la vitamina D ejerce varios efectos antidiab&eacute;ticos &#091;65&#093;. El VDR est&aacute; expresado en las c&eacute;lulas beta pancre&aacute;ticas, y la vitamina D estimula la secreci&oacute;n de insulina &#091;66,67&#093;. Diversos estudios han demostrado que los suplementos de vitamina D llevan a una mejora de la sensibilidad a la insulina &#091;68-70&#093;, mediado, por ejemplo, por un incremento en la producci&oacute;n de los receptores insul&iacute;nicos &#091;66&#093;, y modula la inflamaci&oacute;n, la cual se piensa que juega tambi&eacute;n un papel en la diabetes tipo 2 &#091;67,71&#093;.</font></p>     <p><font face="Verdana" size="2">Por otro lado, tambi&eacute;n se ha demostrado que los sujetos obesos tienen niveles m&aacute;s bajos de vitamina D que los no obesos &#091;72-77&#093;. Estos niveles menores han sido explicados por, entre otros factores, el almacenamiento en la grasa corporal de la vitamina D &#091;78,79&#093;. Adem&aacute;s los sujetos obesos responden peor a los suplementos de vitamina D, siendo sus aumentos de vitamina D menores a los producidos en sujetos no obesos con las mismas dosis de suplemento, siendo, por tanto, mayores sus necesidades &#091;72,76,77&#093;. En conexi&oacute;n con lo hablado anteriormente, algunos estudios han demostrado que la correcci&oacute;n del d&eacute;ficit de vitamina D en sujetos obesos mejora la sensibilidad a la insulina &#091;69&#093;, aunque algunos autores no han encontrado disminuci&oacute;n de la resistencia a la insulina con los suplementos de vitamina D en estos sujetos &#091;74,80&#093;. Incluso, en un reciente estudio aleatorizado, a doble ciego y controlado con placebo realizado por Salehpour y cols. en 77 mujeres con sobrepeso y obesidad, los autores hallaron que el grupo de mujeres que tomaron vitamina D durante 12 semanas mostraron un descenso en la masa grasa corporal significativamente mayor que las del grupo placebo (-2,7&plusmn;2,1 kg <i>vs</i>. -0,47&plusmn;2,1 kg; p&lt;0,001), con una correlaci&oacute;n inversa significativa entre ambos par&aacute;metros (r=-0,319, p=0,005), aunque el peso y la circunferencia de la mu&ntilde;eca no mostraron cambios significativos en ninguno de los dos grupos &#091;81&#093;. Estos datos de correlaci&oacute;n entre la vitamina D y la masa grasa corporal ya ha sido reportado por otros autores &#091;82,83&#093;.</font></p>     <p><font face="Verdana" size="2">Estos hallazgos comunes tienen justificaci&oacute;n en el marco del s&iacute;ndrome metab&oacute;lico. En un estudio realizado en 4.727 j&oacute;venes sanos a los que se les realiz&oacute; un seguimiento de 20 a&ntilde;os, se observ&oacute; que la prevalencia de la mayor&iacute;a de los componentes del s&iacute;ndrome metab&oacute;lico (obesidad abdominal, hiperglucemia y concentraciones s&eacute;ricas bajas de HDL-colesterol) fue descendiendo significativamente a los largo de los quintiles de ingesta de vitamina D (p=0,05). Hubo una asociaci&oacute;n inversa significativa entre la ingesta diet&eacute;tica o por suplemento de vitamina D y el riesgo de desarrollar un s&iacute;ndrome metab&oacute;lico a los 20 a&ntilde;os &#091;84&#093;. Otro estudio de seguimiento a 5 a&ntilde;os a 11.547 adultos realizado en Australia observ&oacute; que los niveles bajos de vitamina D se correlacionaron inversamente con un mayor riesgo de s&iacute;ndrome metab&oacute;lico, mayor circunferencia de la mu&ntilde;eca, mayores niveles de glucosa y triglic&eacute;ridos s&eacute;ricos, y mayor resistencia a la insulina &#091;85&#093;. Se ha observado en sujetos obesos que los suplementos de vitamina D descienden los niveles de GH y IGF, por lo que los efectos adversos del eje GH-IGF-insulina en el metabolismo de la glucosa y el s&iacute;ndrome metab&oacute;lico puede en parte estar asociados al estado deficitario de la vitamina D &#091;74&#093;.</font></p>     <p><font face="Verdana" size="2">Todos estos estudios demuestran una participaci&oacute;n de la vitamina D en el metabolismo, aunque quedan a&uacute;n muchas inc&oacute;gnitas sobre la implicaci&oacute;n que pudiera tener en la diabetes <i>mellitus</i> tipo 2 y la obesidad, y, m&aacute;s generalmente, en el s&iacute;ndrome metab&oacute;lico, y bien en su etiopatogenia, bien como posible efecto terap&eacute;utico.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><i>Vitamina D y diabetes mellitus tipo 1</i></font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se han realizado estudios para ver la influencia de la vitamina D con la diabetes tipo 1 &#091;86&#093;. De etiopatogenia distinta a la tipo 2, la diabetes tipo 1 puede tener conexiones con la vitamina D a trav&eacute;s de la acci&oacute;n de &eacute;sta sobre el sistema inmune &#091;87&#093;, y que analizaremos en el siguiente apartado. Littorin y cols. observaron que los adultos j&oacute;venes de reciente diagn&oacute;stico de diabetes tipo 1 ten&iacute;an niveles m&aacute;s bajos de vitamina D que los sujetos sin la enfermedad que participaron como control &#091;88&#093;. Sorensen y cols., realizaron un seguimiento a 29.072 mujeres embarazadas y sus descendientes, y observaron que los hijos de las mujeres que ten&iacute;an niveles m&aacute;s bajos de vitamina D durante el embarazo ten&iacute;an el doble de riesgo de sufrir diabetes tipo 1 que aqu&eacute;llos de madres con niveles m&aacute;s altos &#091;89&#093;.</font></p>     <p><font face="Verdana" size="2">Un estudio realizado en una cohorte de reci&eacute;n nacidos a los que se les hizo seguimiento durante un a&ntilde;o, obtuvo que los ni&ntilde;os que tomaron suplementos de vitamina D, tanto regular como irregularmente, tuvieron menos riesgo relativo de padecer diabetes tipo 1 que los que no lo hicieron (RR=0,12; 95% IC, 0,03-0,51, y RR=0,16; 95% IC, 0,04-0,74, respectivamente) &#091;90&#093;. Li y cols. estudiaron a 35 pacientes con diabetes autoinmune latente a los que asignaron aleatoriamente a un grupo de tratamiento s&oacute;lo con insulina o a otro tratado con insulina y vitamina D durante un a&ntilde;o. Al final del estudio, los niveles de p&eacute;ptido C disminuyeron en el grupo tratado s&oacute;lo con insulina (p=0,006), mientras que en el grupo tratado tambi&eacute;n con vitamina D se mantuvieron estables. El 70% de los pacientes tratados con vitamina D mantuvieron o incrementaron sus niveles de p&eacute;ptido C, mientras que el 22% de los tratados s&oacute;lo con insulina lo hicieron, siendo significativa la diferencia (p=0,01) &#091;91&#093;.</font></p>     <p><font face="Verdana" size="2">Un metaan&aacute;lisis realizado a partir de estudios observacionales concluy&oacute; que los suplementos de vitamina D en edades tempranas podr&iacute;an ofrecer protecci&oacute;n contra el desarrollo de diabetes tipo 1 &#091;92&#093;. Sin embargo, otros autores no encuentran este efecto protector de la vitamina D sobre los sujetos con diabetes tipo 1 de inicio reciente &#091;93,94&#093;, por lo que se precisan m&aacute;s estudios que ayuden a dilucidar si la vitamina D puede ejercer un beneficio a&ntilde;adido en el tratamiento en estos pacientes.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Vitamina D y sistema inmunitario</b></font></p>     <p><font face="Verdana" size="2">La participaci&oacute;n de la vitamina D en la inmunidad ha sido estudiada desde hace ya muchos a&ntilde;os. Los VDR est&aacute;n presentes en todas las c&eacute;lulas del sistema inmune &#091;95&#093;, y un gran n&uacute;mero de genes relacionados con la inmunidad est&aacute;n regulados por la vitamina D &#091;96&#093;.</font></p>     <p><font face="Verdana" size="2">Se ha puesto en evidencia su participaci&oacute;n tanto en la inmunidad natural o innata (es sabido desde hace mucho tiempo el efecto beneficioso del sol en los pacientes con tuberculosis) como en la adquirida. La vitamina D mejora los efectos antimicrobianos de los macr&oacute;fagos y los monocitos, as&iacute; como la quimiotaxis y la capacidad fagocitaria de estas c&eacute;lulas &#091;97&#093;. La catelicidina y la &beta;2 defensina son p&eacute;ptidos antimicrobianos que act&uacute;an desestabilizando la membrana microbiana, y son producidos por polimorfonucleares y macr&oacute;fagos; la vitamina D a trav&eacute;s de sus VDR (junto con los receptores X retinoides) activa directamente la transcripci&oacute;n de estos p&eacute;ptidos y su producci&oacute;n &#091;98-100&#093;. En un estudio realizado en pacientes cr&iacute;ticos (con y sin sepsis) se determinaron los niveles de vitamina D y catelicidina compar&aacute;ndolo con un grupo de sujetos sanos, observando que los pacientes cr&iacute;ticos ten&iacute;an valores m&aacute;s bajos de ambos que los sujetos sanos, y hallaron una asociaci&oacute;n positiva y significativa entre los niveles de vitamina D y catelicidina &#091;101&#093;. Tambi&eacute;n hay estudios que demuestran que la vitamina D modula la maduraci&oacute;n de las c&eacute;lulas dendr&iacute;ticas &#091;102,103&#093;. Se ha descrito, por otro lado, que la vitamina D inhibe citoquinas de las c&eacute;lulas T, tales como la IL-2 y la 17, y los receptores tipo Toll (<i>toll-like receptors</i>) de los monocitos, responsables del reconocimiento de un amplio n&uacute;mero de agentes microbianos y de estimular la respuesta inflamatoria contra ellos &#091;97&#093;. Por &uacute;ltimo, se ha comprobado que dosis altas de vitamina D en sujetos sanos llevan a una reducci&oacute;n de la IL-6 (citoquina proinflamatoria) producida por los monocitos &#091;104&#093;.</font></p>     <p><font face="Verdana" size="2">Todo esto, unido a los diversos estudios que han hallado niveles bajos de vitamina D en pacientes con diversas enfermedades infecciosas respiratorias &#091;105-108&#093;, y aquellos otros que evidencian una m&aacute;s r&aacute;pida recuperaci&oacute;n en pacientes con tuberculosis a los que se les administra suplementos de vitamina D &#091;109,110&#093;, apoya la teor&iacute;a de la participaci&oacute;n de la vitamina D en la inmunidad natural.</font></p>     <p><font face="Verdana" size="2">Respecto a la inmunidad adquirida, la vitamina D regula la diferenciaci&oacute;n y proliferaci&oacute;n de linfocitos T y B, especialmente cuando &eacute;stos han sido activados, ya que se ha comprobado que en estado de actividad celular la expresi&oacute;n de genes activados por la vitamina D a trav&eacute;s de sus receptores nucleares espec&iacute;ficos en dichas c&eacute;lulas aumenta considerablemente, genes que est&aacute;n implicados en la regulaci&oacute;n de la proliferaci&oacute;n y la diferenciaci&oacute;n de estos linfocitos &#091;111,112&#093;.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En los linfocitos B esta acci&oacute;n se ha visto que se produce de forma indirecta, a trav&eacute;s de los linfocitos T cooperadores o  <i>helper</i>, que inducen la inhibici&oacute;n de la proliferaci&oacute;n y diferenciaci&oacute;n de los linfocitos B y el inicio de su apoptosis, as&iacute; como una menor producci&oacute;n de inmunoglobulinas &#091;113,114&#093;; sin embargo, estudios m&aacute;s recientes han demostrado un efecto directo de la vitamina D sobre los linfocitos B &#091;97,111,115&#093;.</font></p>     <p><font face="Verdana" size="2">Respecto a los linfocitos T activados, la vitamina D los conduce a una situaci&oacute;n de mayor tolerancia inmune, suprimiendo la proliferaci&oacute;n y diferenciaci&oacute;n de los linfocitos T cooperadores y modulando la producci&oacute;n de sus citoquinas &#091;113&#093;, inhibiendo las citoquinas proinflamatorias (IL-2, interfer&oacute;n-&gamma;, TNF&alpha;, IL-9, IL-22) &#091;96,116-118&#093;, y promoviendo la producci&oacute;n de citoquinas antiinflamatorias (IL-3, IL-4, IL-5, IL-10) &#091;119&#093;.</font></p>     <p><font face="Verdana" size="2">En consecuencia, no es de extra&ntilde;ar la relaci&oacute;n descrita por diversos autores entre la deficiencia de vitamina D y las enfermedades autoinmunes, tales como la diabetes tipo 1 (que ya hemos comentado), la artritis reumatoide &#091;120&#093;, el lupus eritematoso sist&eacute;mico &#091;121&#093;, la esclerosis m&uacute;ltiple &#091;122&#093;, la psoriasis &#091;123&#093;, la enfermedad inflamatoria intestinal cr&oacute;nica &#091;124&#093;, etc. Aunque, al igual que comentamos respecto al c&aacute;ncer, deben realizarse m&aacute;s estudios que descubran la verdadera participaci&oacute;n de la vitamina D en la patogenia de estas enfermedades.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Conclusiones</b></font></p>     <p><font face="Verdana" size="2">Est&aacute; claro que la vitamina D tiene una implicaci&oacute;n en la salud general, y que no s&oacute;lo el hueso se beneficia de ella. Aparte de las funciones aqu&iacute; desarrolladas, numerosos estudios buscan su relaci&oacute;n con otras, como la reproducci&oacute;n, el sistema neurol&oacute;gico, la enfermedad cardiovascular, etc. No podemos olvidarnos de la estrecha relaci&oacute;n que existe entre la vitamina D y el calcio, mol&eacute;cula que tiene tambi&eacute;n una amplia participaci&oacute;n en las funciones c&eacute;lulares. Establecer hasta qu&eacute; punto la vitamina D est&aacute; implicada en la fisiolog&iacute;a extra&oacute;sea a&uacute;n est&aacute; por definir. Sin embargo, los estudios cada vez m&aacute;s numerosos que se realizan en este sentido marcan el camino, e invitan a los investigadores a continuar profundizando en los conocimientos de las acciones de esta vitamina que pas&oacute; a ser hormona calciotropa, y que quiz&aacute;s pase a considerarse, al igual que las tiroideas, como una hormona de acci&oacute;n multisist&eacute;mica.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. McCollum EV, Simmonds N, Becker JE, Shipley PG. Studies on experimental rickets. XXI. An experimental demostration of the existence on a vitamin wich promotes calcium depositins. J Biol Chem 1922;53:293-312.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969290&pid=S1889-836X201400050000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
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<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">77. Gallagher C, Yalamanchili V, Smith LM. The effect of vitamin D supplementation on serum 25(OH)D in thin and obese women. J Steroid Biochem Mol Biol 2013;136:195-200.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969442&pid=S1889-836X201400050000300077&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">78. Danescu LG, Levy S, Levy J. Vitamin D and diabetes mellitus. Endocrine 2009;35:11-7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969444&pid=S1889-836X201400050000300078&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">79. Bays HE, Gonz&aacute;lez-Campoy JM, Bray GA, Kitabchi AE, Bergman DA, Schorr AB, et al. Pathogenic potential of adipose tissue and metabolic consequences of adipocyte hypertrophy and increased visceral adiposity. Expert Rev Cardio Ther 2008,6:343-68.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969446&pid=S1889-836X201400050000300079&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">80. Beilfuss J, Berg V, Sneve M, Jorde R, Kamycheva E. Effects of a 1-year supplementation with cholecalciferol on interleukin-6, tumor necrosis factor-alpha and insulin resistance in overweight and obese subjects. Cytokine 2012;60:870-4.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969448&pid=S1889-836X201400050000300080&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">81. Salehpour A, Hosseinpanah F, Shidfar F, Vafa M, Razaghi M, Dehghani S, et al. A 12-week double-blind randomized clinical trial of vitamin D3 supplementation on body fat mass in healthy overweight and obese women. Nutr J 2012;11:78-85.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969450&pid=S1889-836X201400050000300081&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
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<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">102. Piemonti L, Monti P, Sironi M, Fraticelli P, Leone BE, Dal Cin E, et al. Vitamin D3 affects differentiation, maturation, and function of human monocyte- derived dendritic cells. J Immunol 2000;164:4443-51.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969492&pid=S1889-836X201400050000300102&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">103. Penna G, Amuchastegui S, Giarratana N, Daniel KC, Vulcano M, Sozzani S, et al. 1,25-Dihydroxyvitamin D3 selectively modulates tolerogenic properties in myeloid but not plasmacytoid dendritic cells. J Immunol 2007;178:145-53.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969494&pid=S1889-836X201400050000300103&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">104. M&uuml;ller K, Diamant M, Bendtzen K. Inhibition of production and function of interleukin-6 by 1,25-dihydroxyvitamin D3. Immunol Lett 1991;28:115-20.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969496&pid=S1889-836X201400050000300104&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">105. Cannell JJ, Vieth R, Umhau JC, Holick MF, Grant WB, Madronich S, et al. Epidemic influenza and vitamin D. Epidemiol Infect 2006;134:1129-40.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969498&pid=S1889-836X201400050000300105&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">106. Laaksi I, Ruohola JP, Tuohimaa P, Auvinen A, Haataja R, Pihlajam&auml;ki H, et al. An association of serum vitamin D concentrations &lt;40 nmol/l with acute respiratory tract infection in young Finnish men. Am J Clin Nutr 2007;86:714-7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969500&pid=S1889-836X201400050000300106&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">107. Cannell JJ, Vieth R, Willett W, Zasloff M, Hathcock JN, White JH, et al. Cod liver oil, vitamin A toxicity, frequent respiratory infections, and the vitamin D deficiency epidemic. Ann Otol Rhinol Laryngol 2008;117:864-70.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969502&pid=S1889-836X201400050000300107&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">108. Ginde AA, Mansbach JM, Camargo CA. Association between serum 25-hydroxyvitamin D level and upper respiratory tract infection in the Third National Health and Nutrition Examination Survey. Arch Intern Med 2009;169:384-90.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969504&pid=S1889-836X201400050000300108&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">109. Salahuddin N, Ali F, Hasan Z, Rao N, Aqeel M, Mahmood F. Vitamin D accelerates clinical recovery from tuberculosis: results of the SUCCINCT Study (Supplementary Cholecalciferol in recovery from tuberculosis). A randomized, placebo-controlled, clinical trial of vitamin D supplementation in patients with pulmonary tuberculosis'. BMC Infect Dis 2013;13:22.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969506&pid=S1889-836X201400050000300109&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">110. Coussens AK, Wilkinson RJ, Hanifa Y, Nikolayevskyy V, Elkington PT, Islam K, et al. Vitamin D accelerates resolution of inflammatory responses during tuberculosis treatment. Proc Natl Acad Sci USA 2012;109:15449-54.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969508&pid=S1889-836X201400050000300110&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">111. Chen S, Sims GP, Chen XX, Gu YY, Chen S, Lipsky PE. Modulatory effects of 1,25-dihydroxyvitamin D3 on human B cell differentiation. J Immunol 2007;179:1634-47.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969510&pid=S1889-836X201400050000300111&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">112. Mahon BD, Wittke A, Weaver V, Cantorna MT. The targets of vitamin D depend on the differentiation and activation status of CD4 positive T cells. J Cell Biochem 2003;89:922-32.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969512&pid=S1889-836X201400050000300112&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">113. Lemire JM, Adams JS, Kermani-Arab V, Bakke AC, Sakai R, Jordan SC. 1,25-Dihydroxyvitamin D3 suppresses human T helper/inducer lymphocyte activity in vitro. J Immunol 1985;134:3032-5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969514&pid=S1889-836X201400050000300113&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">114. Lemire JM, Adams JS, Sakai R, Jordan SC. 1a,25-dihydroxyvitamin D3 suppresses proliferation and immunoglobulin production by normal human peripheral blood mononuclear cells. J Clin Investig 1984;74:657-61.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969516&pid=S1889-836X201400050000300114&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">115. Mora JR, Iwata M, von Andrian UH. Vitamin effects on the immune system: Vitamins A and D take centre stage. Nat Rev Immunol 2008;8;685-98.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969518&pid=S1889-836X201400050000300115&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">116. Cantorna MT. Mechanisms underlying the effect of vitamin D on the immune system. Proc Nutr Soc 2011;69:286-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969520&pid=S1889-836X201400050000300116&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">117. Van Belle TL, Gysemans C, Mathieu C. Vitamin D in autoimmune, infectious and allergic diseases: A vital player? Best Pract Res Clin Endocrinol Metab 2011;25:617-32.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969522&pid=S1889-836X201400050000300117&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">118. Palmer MT, Lee YK, Maynard CL, Oliver JR, Bikle DD, Jetten AM, et al. Lineage-specific effects of 1,25-dihydroxyvitamin D3 on the development of effector CD4 T cells. J Biol Chem 2011;286:997-1004.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969524&pid=S1889-836X201400050000300118&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">119. Boonstra A, Barrat FJ, Crain C, Heath VL, Savelkoul HFJ, Garra AO. 1alpha,25-dihydroxyvitamin D3 has a direct effect on naive CD4+T cells to enhance the development of Th2 cells. J Immunol 2001;167:4974-80.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969526&pid=S1889-836X201400050000300119&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">120. Haga HJ. Vitamin D in rheumatoid arthritis. Expert Rev Clin Immunol 2013;9:591-3.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969528&pid=S1889-836X201400050000300120&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">121. Sakthiswary R, Raymond AA. The clinical significance of vitamin D in systemic lupus erythematosus: a systematic review. PLoS One 2013;8:e55275.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969530&pid=S1889-836X201400050000300121&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">122. Mesliniene S, Ramrattan L, Giddings S, Sheikh-Ali M. Role of vitamin D in the onset, progression, and severity of multiple sclerosis. Endocr Pract 2013;19:129-36.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969532&pid=S1889-836X201400050000300122&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">123. Kamangar F, Koo J, Heller M, Lee E, Bhutani T. Oral vitamin D, still a viable treatment option for psoriasis. J Dermatolog Treat 2013;24:261-7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969534&pid=S1889-836X201400050000300123&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">124. Iijima H, Shinzaki S, Takehara T. The importance of vitamins D and K for the bone health and immune function in inflammatory bowel disease. Curr Opin Clin Nutr Metab Care 2012;15:635-40.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4969536&pid=S1889-836X201400050000300124&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><a href="#top"><img border="0" src="/img/revistas/romm/v6s1/seta.gif" width="15" height="17"></a><a name="bajo"></a><b>Dirección para correspondencia:</b>    <br>M<sup>a</sup> Jes&uacute;s G&oacute;mez de Tejada Romero    ]]></body>
<body><![CDATA[<br>Departamento de Medicina (Facultad de Medicina)    <br>Universidad de Sevilla    <br>Avda. Dr. Fedriani, s/n    <br>41009 Sevilla (Espa&ntilde;a)    <br>Correo electr&oacute;nico: <a href="mailto:mjgtr@us.es">mjgtr@us.es</a></font></p>      ]]></body><back>
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