<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-9957</journal-id>
<journal-title><![CDATA[Revista colombiana de Gastroenterología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Col Gastroenterol]]></abbrev-journal-title>
<issn>0120-9957</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Gastroenterología  ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-99572014000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Probióticos para el tratamiento específico del dolor en el síndrome del intestino irritable: Una revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Probiotics for Specific Treatment of Pain in Irritable Bowel Syndrome: A Review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz Lucas]]></surname>
<given-names><![CDATA[María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tobías]]></surname>
<given-names><![CDATA[Aurelio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saz Peiró]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sebastián]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad San Jorge Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Zaragoza ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto de Diagnóstico Ambiental y Estudios del Agua (IDAEA), CSIC  ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>España</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Zaragoza Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Zaragoza ]]></addr-line>
<country>España</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Hospital Royo Villanova Servicio de Digestivo ]]></institution>
<addr-line><![CDATA[Zaragoza ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>146</fpage>
<lpage>155</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99572014000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99572014000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99572014000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El dolor abdominal es uno de los síntomas peor tolerados por los pacientes con síndrome del intestino irritable (SII). Estudios realizados los últimos años sugieren que existe una disbiosis intestinal en estos pacientes, que podría ser responsable, al menos en parte, de los síntomas. La revisión de la literatura apunta hacia que los probióticos podrían ser una terapia efectiva en el alivio del dolor en el SII, y se acepta que sus efectos son específicos de cuerdo a la cepa empleada. En este artículo se revisa el efecto que cada cepa, o mezcla de probióticos, tiene en el alivio del dolor abdominal, según los ensayos clínicos publicados, y se discuten los posibles mecanismos de acción. Se proponen nuevas perspectivas de investigación para poder dilucidar el mecanismo de acción de los probióticos en el alivio del dolor abdominal en estos pacientes]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abdominal pain is one of the least well tolerated symptoms in patients with irritable bowel syndrome (IBS). Studies conducted in recent years suggest that dysbiosis in these patients may be responsible, at least in part, for these symptoms. This literature review indicates that probiotics may be an effective therapy for the relief of pain in patients with IBS and recognizes that the effects of probiotics are specific to the strain used. In this article we review the effect that each strain or mixture of probiotics has for relieving abdominal pain according to published clinical trials and we also discuss possible mechanisms of action. New perspectives are proposed for research to elucidate the mechanisms of probiotic action for relief of abdominal pain in these patients]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Probióticos]]></kwd>
<kwd lng="es"><![CDATA[síndrome del intestino irritable]]></kwd>
<kwd lng="es"><![CDATA[dolor abdominal]]></kwd>
<kwd lng="es"><![CDATA[mecanismo de acción]]></kwd>
<kwd lng="en"><![CDATA[Probiotics]]></kwd>
<kwd lng="en"><![CDATA[irritable bowel syndrome]]></kwd>
<kwd lng="en"><![CDATA[abdominal pain]]></kwd>
<kwd lng="en"><![CDATA[mechanism of action]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <FONT FACE="Verdana" SIZE=4>    <p align="center"><b>Probi&oacute;ticos para el tratamiento espec&iacute;fico del dolor en   el s&iacute;ndrome del intestino irritable. Una revisi&oacute;n</b></p></FONT> <FONT FACE="Verdana" SIZE=2>    <p align="center">Mar&iacute;a Ortiz Lucas Lic. (1), Aurelio Tob&iacute;as (2), Pablo   Saz Peir&oacute; MD. (3), Juan Jos&eacute; Sebasti&aacute;n MD. (4)</p>     <p>(1) Licenciada en Bioqu&iacute;mica, Profesora universitaria,   Facultad de Ciencias de la Salud, Universidad San Jorge. Zaragoza, Espa&ntilde;a. </p>     <p>(2) Investigador, Instituto de Diagn&oacute;stico Ambiental y   Estudios del Agua (IDAEA), CSIC. Barcelona, Espa&ntilde;a. </p>     <p>(3) Profesor universitario, Facultad de Medicina,   Universidad de Zaragoza. Zaragoza, Espa&ntilde;a. </p>     <p>(4) Profesor universitario, Facultad de Medicina, Jefe   del Servicio de Digestivo, Hospital Royo Villanova. Zaragoza, Espa&ntilde;a. </p>     <p>Correspondencia: <a href="mariaortizlucas@gmail.com">mariaortizlucas@gmail.com</a>;   <a href="aurelio.tobias@gmail.com">aurelio.tobias@gmail.com</a>; <a href="pablosaz@unizar.es">pablosaz@unizar.es</a>; <a href="jjsebastian@salud.aragon.es">jjsebastian@salud.aragon.es</a></p>     <p>Fecha recibido: 04-10-13   Fecha aceptado: 08-15-14</p>     <p><b>Resumen</b></p>     ]]></body>
<body><![CDATA[<p>El dolor abdominal es uno de los s&iacute;ntomas peor   tolerados por los pacientes con s&iacute;ndrome del intestino irritable (SII).   Estudios realizados los &uacute;ltimos a&ntilde;os sugieren que existe una disbiosis   intestinal en estos pacientes, que podr&iacute;a ser responsable, al menos en parte,   de los s&iacute;ntomas. La revisi&oacute;n de la literatura apunta hacia que los probi&oacute;ticos   podr&iacute;an ser una terapia efectiva en el alivio del dolor en el SII, y se acepta   que sus efectos son espec&iacute;ficos de cuerdo a la cepa empleada. En este art&iacute;culo   se revisa el efecto que cada cepa, o mezcla de probi&oacute;ticos, tiene en el alivio   del dolor abdominal, seg&uacute;n los ensayos cl&iacute;nicos publicados, y se discuten los   posibles mecanismos de acci&oacute;n. Se proponen nuevas perspectivas de investigaci&oacute;n   para poder dilucidar el mecanismo de acci&oacute;n de los probi&oacute;ticos en el alivio del   dolor abdominal en estos pacientes.</p>     <p><b>Palabras clave</b></p>     <p>Probi&oacute;ticos, s&iacute;ndrome del intestino irritable, dolor   abdominal, mecanismo de acci&oacute;n.</p>     <p><b>S&Iacute;NDROME DEL INTESTINO IRRITABLE Y MICROBIOTA</b></p>     <p>El s&iacute;ndrome del intestino irritable (SII) es el   trastorno funcional digestivo m&aacute;s prevalente. El diagn&oacute;stico de SII se   establece seg&uacute;n criterios cl&iacute;nicos consensuados (criterios de Roma), que han   ido variando en el transcurso de los a&ntilde;os. El &uacute;ltimo consenso (Roma III, 2006)   ratifica que los pacientes con SII deben presentar: "dolor o disconfort   abdominal recurrente, al menos 3 veces al mes, durante los &uacute;ltimos 3 meses,   asociado con 2 o m&aacute;s de los siguientes elementos: mejora con la defecaci&oacute;n,   comienzo asociado con un cambio en la frecuencia de las heces, comienzo   asociado con un cambio en la forma (apariencia) de las heces" (1). En los   &uacute;ltimos a&ntilde;os hay una evidencia creciente que sugiere la presencia de una   disbiosis intestinal en estos pacientes, aunque no haya una alteraci&oacute;n uniforme   en la composici&oacute;n de la microbiota, en el conjunto de pacientes con SII, ni en   los distintos subtipos de SII. Incluso hay autores que sugieren distintos   subtipos de pacientes, de acuerdo a su perfil microbiano (2-4).</p>     <p><b>MECANISMO DE ACCI&Oacute;N DE LOS PROBI&Oacute;TICOS</b></p>     <p>Los probi&oacute;ticos se definen como microorganismos vivos   que confieren un beneficio a la salud del hu&eacute;sped, cuando se los administra en   cantidades adecuadas (5). Tienen diferentes efectos en su hu&eacute;sped. La   modulaci&oacute;n de la microbiota intestinal inducida por los probi&oacute;ticos se atribuye   a su capacidad de colonizar, de forma transitoria, el tracto gastrointestinal,   y a la liberaci&oacute;n de elementos antimicrobianos. Los probi&oacute;ticos compiten con   otros pat&oacute;genos, impidiendo su replicaci&oacute;n y atenuando su virulencia. Tambi&eacute;n   influyen en la funci&oacute;n de la barrera intestinal, al adherirse a las c&eacute;lulas   intestinales y manteniendo la integridad y resistencia de la barrera epitelial,   consiguiendo, de esta forma, prevenir la uni&oacute;n y los efectos de los pat&oacute;genos   ent&eacute;ricos. Los efectos antiinflamatorios de los probi&oacute;ticos se han atribuido al   reclutamiento de c&eacute;lulas inmunes y a la activaci&oacute;n de la respuesta inmune,   mediante la alteraci&oacute;n en la liberaci&oacute;n de citocinas y quimiocinas. Finalmente,   los probi&oacute;ticos podr&iacute;an tener un papel en la reducci&oacute;n de la hipersensibilidad   visceral. Adem&aacute;s de estos efectos locales, los probi&oacute;ticos tambi&eacute;n tienen una   acci&oacute;n sist&eacute;mica produciendo un aumento de la protecci&oacute;n inmune (6,7).</p>     <p>En el caso particular del SII, se postula que los   probi&oacute;ticos podr&iacute;an actuar modificando la microbiota intestinal, mediante el   aumento de la cantidad de bacterias beneficiosas en el tracto gastrointestinal   y la disminuci&oacute;n del sobrecrecimiento bacteriano en el intestino, mejorando la   funci&oacute;n barrera del intestino, al aumentar la permeabilidad intestinal,   invirtiendo el desequilibrio entre las citocinas pro- y antiinflamatorias,   produciendo con ello, un retardo en el tr&aacute;nsito intestinal y modificando la   hipersensibilidad visceral (8,9).</p>     <p>Se han estudiado los efectos de la ingesta de   probi&oacute;ticos en la microbiota de los pacientes con SII. Los estudios llegan a   distintas conclusiones: algunos autores no pudieron demostrar un cambio en la   microbiota intestinal de los pacientes, tras la ingesta de probi&oacute;ticos (10-12),   mientras que otros encontraron una estabilizaci&oacute;n de la microbiota (13-15).   Estos &uacute;ltimos consideraron que la estabilizaci&oacute;n de la microbiota es un efecto   positivo, ya que se ha encontrado una microbiota inestable en los pacientes con   SII, en comparaci&oacute;n con la de sujetos sanos (16,17). En un estudio publicado   recientemente se evidenci&oacute; un cambio en la microbiota de los pacientes tratados   con probi&oacute;ticos (18).</p>     <p>Los mecanismos de acci&oacute;n de los probi&oacute;ticos dependen   del probi&oacute;tico en s&iacute; mismo, y la evidencia cient&iacute;fica indica que es espec&iacute;fica   de la especie e incluso de la cepa de probi&oacute;tico. Adem&aacute;s, los efectos en el   hu&eacute;sped son m&uacute;ltiples (6). Con relaci&oacute;n al SII, el dolor abdominal es uno de   los s&iacute;ntomas peor tolerados por estos pacientes, incidiendo de forma negativa   en su calidad de vida (19). La revisi&oacute;n de la literatura sugiere que los   probi&oacute;ticos podr&iacute;an ser una terapia efectiva en el tratamiento del dolor de   algunos pacientes con SII (20-22); sin embargo, &iquest;qu&eacute; especies o cepas, en   particular, de probi&oacute;tico son las responsables del alivio del dolor en los   pacientes con SII?</p>     ]]></body>
<body><![CDATA[<p><b>EFECTO ANTINOCICEPTIVO DE LOS PROBI&Oacute;TICOS</b></p>     <p>La <a href="#tabla1">tabla 1</a> muestra un resumen de los resultados de   ensayos cl&iacute;nicos, aleatorios, sobre el efecto de los probi&oacute;ticos en el alivio   del dolor abdominal en pacientes adultos con SII, considerando la composici&oacute;n   de la cepa de probi&oacute;tico o la mezcla de probi&oacute;ticos en cada uno de los estudios   (10,13,15,18,23-49). &Uacute;nicamente en 2 estudios, el efecto de los probi&oacute;ticos en   el alivio del dolor abdominal fue considerado como variable principal del   estudio (41,43).</p>     <p align="center"><img src="img/revistas/rcg/v29n2/v29n2a09t1.jpg" width="580" height="809"><a name="tabla1"></a></p>     <p><b>ESPECIES DE PROBI&Oacute;TICOS</b></p>     <p>En dos estudios (26,49) se midi&oacute; el efecto de la cepa Lactobacillus   plantarum DSM 9843 (299v) en el alivio del dolor abdominal. Ducrott&eacute; y sus   colaboradores (26) encontraron una mejor&iacute;a, mientras que Nobaek y su equipo   (49) hallaron una mejor&iacute;a con respecto al inicio del tratamiento en ambos   grupos de pacientes (probi&oacute;ticos y placebo), pero no al comparar los dos grupos   entre s&iacute;. Otras mezclas de probi&oacute;ticos, que tambi&eacute;n conten&iacute;an L. plantarum, no   produjeron ninguna mejor&iacute;a al comparar entre los grupos (10,13,45,48). En   animales sanos se encontr&oacute; un efecto antiinflamatorio y una reducci&oacute;n de la   percepci&oacute;n del dolor intestinal, tras la administraci&oacute;n de esta especie (50).   Este efecto antinociceptivo no se encontr&oacute; cuando se provoc&oacute; un est&iacute;mulo   doloroso a nivel g&aacute;strico (51). Al evaluar esta especie de probi&oacute;tico (cepa   NCIMB8826) y una mutante de la misma deficiente en D-alanina , se encontr&oacute; que   el efecto regulador de los probi&oacute;ticos en la precepci&oacute;n del dolor visceral, a   nivel del colon, podr&iacute;a estar relacionado con el grado de D-alaninaci&oacute;n del   &aacute;cido lipoteicoico, un componente de la pared celular bacteriana. Se ha   propuesto que las citocinas antiinflamatorias tambi&eacute;n podr&iacute;an estar   involucradas en la disminuci&oacute;n de la percepci&oacute;n visceral del dolor (50,52). Sin   embargo, el mecanismo de acci&oacute;n antinociceptivo parece que es espec&iacute;fico de la   cepa de probi&oacute;tico, pero tambi&eacute;n del &oacute;rgano diana (51).</p>     <p>Dos estudios (43,44) encontraron un efecto positivo de   la cepa Bifidobacterium infantis 35624 en el tratamiento del dolor abdominal,   que Charbonneau y colaboradores (23) no pudieron confirmar. Adem&aacute;s, Whorwell y   sus investigadores (43) hallaron que este efecto era significativo en el caso   de los pacientes con predominio de estre&ntilde;imiento. Al administrar la mezcla de   probi&oacute;ticos VSL#3 que contiene, entre otras, esta especie, no se encontr&oacute;   ninguna mejor&iacute;a en el alivio del dolor abdominal (10,45,48). En ratas sanas, en   ratas con perfil de ansiedad y en ratas con perfil de hipersensibilidad del   colon posinflamatoria (53,54) se encontr&oacute; un efecto antinociceptivo visceral de   la cepa B. infantis 35624. El efecto positivo en el alivio del dolor abdominal   que se encontr&oacute; en el estudio de O'Mahony y su equipo (44) se acompa&ntilde;&oacute; de una   modulaci&oacute;n de la respuesta inmune, restableciendo la relaci&oacute;n IL-10/IL-12 en el   grupo de los probi&oacute;ticos; sin embargo, no se aportaron datos de correlaciones   para proporcionar una relaci&oacute;n m&aacute;s directa entre estos dos factores. Duncker y   colaboradores (50) sugieren que podr&iacute;a existir una relaci&oacute;n entre los niveles   de citocinas y la capacidad nociceptiva del sistema nervioso, lo que permitir&iacute;a   explicar estos resultados de O´Mahonny y su equipo.</p>     <p>Se demostr&oacute; un efecto positivo de la cepa Bifidobacterium   bifidum MIMBb75 en el tratamiento del dolor abdominal en un estudio (30). Tres   estudios m&aacute;s emplearon otras cepas de B. bifidum como parte de una mezcla de   probi&oacute;ticos (18,36,37). Los pacientes que se trataron con la mezcla de   probi&oacute;ticos que conten&iacute;an la cepa B. bifidum BGN4 (36) tambi&eacute;n mostraron una   mejor&iacute;a del dolor abdominal y los que se trataron con la mezcla que conten&iacute;a la   cepa B. bifidum (KCTC 12 199BP) (18) tuvieron una tendencia a la mejor&iacute;a   (p=0,07), con respecto al grupo control (adem&aacute;s, el grupo tratado con   probi&oacute;ticos tuvo una mejor&iacute;a significativa con respecto al inicio del   tratamiento, que no se observ&oacute; en el grupo control). El tratamiento con la   mezcla de probi&oacute;ticos que conten&iacute;a la cepa B. bifidum CUL-20 (NCIMB 30153) (37)   no difiri&oacute; del placebo; sin embargo, tanto el grupo de los probi&oacute;ticos como el   grupo placebo mostraron una mejor&iacute;a, cuando se compararon los datos antes y   despu&eacute;s del estudio en cada uno de los grupos, de forma individual.</p>     <p>La cepa Lactobacillus salivarius ssp. salivarius   UCC4331 (44) mejor&oacute; el dolor abdominal a las semanas 2 y 7 de tratamiento, pero   no al finalizar las 8 semanas del mismo. Al estudiar la cepa Escherichia coli   Nissle 1917 (27) se mostr&oacute; una mejor&iacute;a del dolor abdominal, cuando se   comparaban los resultados al inicio del tratamiento, tanto en el grupo con   tratamiento como en el grupo placebo, y se hall&oacute; un aumento del umbral de   sensibilidad visceral, al administrar esta cepa a ratas con hiperalgesia   visceral posinflamatoria, pero no al administrarlo a ratas sanas (55).</p>     <p>Otros ensayos cl&iacute;nicos estudiaron la acci&oacute;n de otras   cepas individuales de probi&oacute;ticos sin obtener diferencias significativas en el   alivio del dolor abdominal. Estas cepas son Saccharomyces boulardii (28,29), Bacillus   coagulans GBI-30 6086 (34), Lactobacillus reuteri ATCC 55730 (47) y Lactobacillus   casei rhamnosus LCR35 (25). En ratas sanas, la cepa Lactobacillus rhamnosus JB-1<a href="#_ftn1" name="_ftnref1" title="">&#91;1&#93;</a> redujo la   hipersensibilidad visceral en la distensi&oacute;n colorrectal (56) y g&aacute;strica (52), y   observ&oacute; que este efecto repercute a nivel medular sobre los ganglios de la ra&iacute;z   dorsal, al evitar su hiperexcitabilidad frente a un est&iacute;mulo doloroso (57).</p>     <p><b>MEZCLAS DE PROBI&Oacute;TICOS</b></p>     ]]></body>
<body><![CDATA[<p>Si se consideran las mezclas de probi&oacute;ticos, Agrawal y   colaboradores (38) hallaron un efecto positivo en el alivio del dolor abdominal   para la mezcla de Bifidobacterium lactis DN-173 010, Streptococcus thermophilus,   y Lactobacillus bulgaricus. Adem&aacute;s, encontraron una correlaci&oacute;n entre la   distensi&oacute;n abdominal y el tiempo de tr&aacute;nsito col&oacute;nico y orofecal, cuando los   pacientes se trataron con esta mezcla. Sin embargo, los autores no   proporcionaron datos de la correlaci&oacute;n del dolor abdominal con el tiempo de   tr&aacute;nsito. Podr&iacute;a ser posible que la mejor&iacute;a en la distensi&oacute;n observada en estos   pacientes pudiera, al menos en parte, aliviar su dolor abdominal. Para esa   misma mezcla de probi&oacute;ticos, otros dos estudios (24,42) encontraron una mejor&iacute;a   en ambos grupos, cuando se comparaban los resultados con los datos al inicio   del estudio.</p>     <p>Las siguientes mezclas de probi&oacute;ticos mostraron un   efecto significativo en el alivio del dolor en los pacientes con SII:</p>     <p>1. B. bifidum BGN4, B. lactis AD011,   Lactobacillus acidophilus AD031, y Lactobacillus casei IBS41(36).</p>     <p>2. L. acidophilus SDC 2012 y 2013(54). En estudios   animales, Rousseaux y su equipo (58) mostraron una reducci&oacute;n del dolor   visceral, cuando se induc&iacute;an los receptores opioides y cannabinoides en las   c&eacute;lulas epiteliales de ratas, tras la administraci&oacute;n de L. acidophilus NCFM.</p>     <p>En un estudio (32) que evaluaba la mezcla de L.   bulgaricus, S. thermophilus, Lactobacillus paracasei ssp. paracasei F19, L.   acidophilus La5 y B. lactis Bb12 se hall&oacute; una tendencia hacia el alivio del   dolor abdominal. Los autores no proporcionaron datos sobre el valor de p. En   otro estudio (33), con la misma mezcla de probi&oacute;ticos, no se encontraron   diferencias entre los grupos, pero s&iacute; una mejor&iacute;a, tanto en el grupo de   tratamiento, como en el grupo placebo, con respecto al inicio del tratamiento,   tanto para el alivio del dolor intestinal, como para la frecuencia de   presentaci&oacute;n de ese dolor.</p>     <p>Las siguientes mezclas de probi&oacute;ticos mostraron una   tendencia a mejorar el dolor abdominal en los pacientes con SII:</p>     <p>1. Bifidobacterium longum LA 101, L. acidophilus LA   102, L. lactis LA 103 y S. thermophilus LA 104 (p=0,054) (40). Se encontr&oacute;,   adem&aacute;s, una mejor&iacute;a, tanto en el grupo de tratamiento, como en el grupo   placebo, con respecto al inicio del tratamiento para todos los pacientes, as&iacute;   como en cada uno de los subgrupos de pacientes con SII. En el subgrupo de   pacientes con un patr&oacute;n alternante se hall&oacute; una mejor&iacute;a significativa entre   ambos grupos en el alivio del dolor abdominal.</p>     <p>2. B. bifidum KCTC 12 199BP, B. lactis KCTC 11 904BP, B.   longum KCTC 12 200BP, L. acidophilus KCTC 11 906BP, L. rhamnosus KCTC 12 202BP   y S. thermophilus KCTC 11 870BP (p=0,07) (18).</p>     <p>3. L. rhamnosus GG (ATCC 53103, LGG), L. rhamnosus Lc705   (DSM 7061), Propionibacterium freudenreichii ssp. shermanii JS (DSM 7067) y B.   animalis ssp. lactis Bb12 (DSM 15954) (p=0,052) (15).</p>     <p>4. Lactobacillus rhamnosus GG, L. rhamnosus LC705,   Bifidobacterium breve Bb99 y P. freudenreichii ssp. shermanii JS (p=0,110)   (46).</p>     ]]></body>
<body><![CDATA[<p>Las siguientes mezclas de probi&oacute;ticos no mostraron un   efecto significativo en el alivio del dolor en los pacientes con SII (ver <a href="#tabla1">tabla   1</a>):</p>     <p>1. L. acidophilus CUL-60 (NCIMB 30157) y CUL-21 (NCIMB   30156), B. bifidum CUL-20 (NCIMB 30153) y B. lactis CUL-34 (NCIMB 30172) (37).   En este estudio se encontr&oacute; una mejor&iacute;a con respecto al inicio del tratamiento   en el grupo tratado con el probi&oacute;tico y en el grupo control, tanto en el alivio   del dolor abdominal, como en el n&uacute;mero de d&iacute;as con dolor.</p>     <p>2. VSL#3 (B. longum, B. infantis, B. breve, L.   acidophilus, L. casei, L. delbrueckii ssp. Bulgaricus, L. plantarum, S.   salivarius ssp. thermophilus) (10,45,48). Sin embargo, Dai y colaboradores (59)   hallaron una disminuci&oacute;n de la hipersensibilidad visceral, al administrar esta   mezcla de probi&oacute;ticos en un modelo de ratas que simulan un perfil de SII, con   predominio de diarrea. Estos autores adem&aacute;s sugieren que el efecto   antinociceptivo del VSL#3 podr&iacute;a estar mediado, al menos en parte, por la   potenciaci&oacute;n de la s&iacute;ntesis de &oacute;xido n&iacute;trico. En este mismo estudio se hall&oacute;   una disminuci&oacute;n de la permeabilidad paracelular y el aumento de prote&iacute;nas de   uni&oacute;n estrecha de membrana, tras la administraci&oacute;n del probi&oacute;tico. Los autores   no hallaron una relaci&oacute;n entre la inhibici&oacute;n de la s&iacute;ntesis de &oacute;xido n&iacute;trico y   los cambios observados en la permeabilidad intestinal, con lo que postulan que   ambos factores no estar&iacute;an correlacionados. Distrutti y su equipo (60) tambi&eacute;n   hallaron un efecto antinociceptivo tras la administraci&oacute;n de VSL#3 en ratas con   hipersensibilidad visceral y alodinia, que adem&aacute;s repercuti&oacute; en una reversi&oacute;n   en la expresi&oacute;n de genes que median el dolor y la inflamaci&oacute;n. Adem&aacute;s, parece   ser que este efecto no se debe a un cambio en el estado de consciencia, ni a la   modificaci&oacute;n del tono rectocol&oacute;nico.</p>     <p>3. L. acidophilus KCTC 11906BP, L. plantarum KCTC11867BP,   L. rhamnosus KCTC 11868BP, B. breve KCTC 11858BP, B. lactis KCTC 11903BP, B.   longum KCTC 11860BP y S. thermophilus KCTC 11870BP (13).</p>     <p>4. Lactobacillus sp. HY7801, B. longum HY8004 y L.   brevis HY7401 (31).</p>     <p>Zeng y colaboradores (39) encontraron que la mezcla de   probi&oacute;ticos que conten&iacute;a L. bulgaricus, L. acidophilus y B. longum mejoraba el   dolor abdominal en los pacientes del grupo de los probi&oacute;ticos, mientras que no   se encontr&oacute; una mejor&iacute;a en el grupo placebo, cuando se comparaban los datos de   antes y despu&eacute;s del estudio, en cada uno de los grupos de forma individual. Sin   embargo, el estudio no proporcion&oacute; datos comparando los 2 grupos. Adem&aacute;s,   sugieren que el descenso en la permeabilidad del intestino delgado, encontrada   despu&eacute;s de la ingesta de la mezcla de probi&oacute;ticos, podr&iacute;a, al menos   parcialmente, contribuir a aliviar los s&iacute;ntomas del SII (incluyendo el dolor).   Sin embargo, no proporcionaron datos de un an&aacute;lisis de correlaci&oacute;n, ni   mostraron una diferencia significativa entre los grupos de probi&oacute;ticos y   placebo.</p>     <p>Otros estudios en animales mostraron un efecto   antinociceptivo de distintas cepas de probi&oacute;ticos. Se encontr&oacute; una modulaci&oacute;n   de la hipersensibilidad visceral de la cepa Lactobacillus paracasei NCC2461 en   ratones, con hipersensibilidad inducida por antibi&oacute;ticos (61) (en este estudio   el probi&oacute;tico tambi&eacute;n normaliz&oacute; los niveles de sustancia P), y en ratas, seg&uacute;n   dos modelos de hipersensibilidad inducida por estr&eacute;s (62). En este &uacute;ltimo   estudio, adem&aacute;s, se observ&oacute; la normalizaci&oacute;n de la permeabilidad intestinal en   las ratas sometidas a separaci&oacute;n materna, tras la administraci&oacute;n del   probi&oacute;tico. Estos efectos fueron espec&iacute;ficos de la cepa de probi&oacute;tico empleada,   ya que no se encontr&oacute; ning&uacute;n efecto tras la administraci&oacute;n de B. lactis NCC362   ni de Lactobacillus johnsonii NCC533. Otra cepa de B. lactis –la cepa CNCM   I-2494– junto con Lactococcus lactis CNCM I-1631, L. bulgaricus y S.   thermophilus (63) s&iacute; redujo la hipersensibilidad visceral en ratas sometidas a   estr&eacute;s. Adem&aacute;s, se demostr&oacute; que este efecto era dosisdependiente. Los autores   de este estudio encontraron una normalizaci&oacute;n de la permeabilidad paracelular,   sugiriendo que podr&iacute;a ser uno de los factores que explicara ese efecto   antinociceptivo.</p>     <p>Ait-Belgnaoui y su equipo (64) hallaron un efecto   antinociceptivo tras la administraci&oacute;n del probi&oacute;tico Lactobacillus farciminis   CIP 103136 en ratas sometidas a estr&eacute;s, y un aumento de la permeabilidad   paracelular col&oacute;nica; ambos factores posiblemente influenciados por la   estimulaci&oacute;n de la liberaci&oacute;n de &oacute;xido n&iacute;trico por el probi&oacute;tico. El probi&oacute;tico   actuar&iacute;a a   nivel de la modulaci&oacute;n de la permeabilidad intestinal, evitando la fosforilaci&oacute;n de   la cadena ligera de la miosina –y la contracci&oacute;n del citoesqueleto de las   c&eacute;lulas epiteliales, con la consiguiente apertura de las uniones estrechas–, lo   que podr&iacute;a deberse a la presencia de &oacute;xido n&iacute;trico. Sin embargo, como ya se ha   coment&oacute;, otros autores (59) no han encontrado una relaci&oacute;n entre el aumento de   la permeabilidad paracelular y la inhibici&oacute;n de la s&iacute;ntesis de &oacute;xido n&iacute;trico,   tras la administraci&oacute;n de la mezcla de probi&oacute;ticos VSL#3. En otro estudio   posterior (65), en el que se administr&oacute; la cepa Lactobacillus farciminis CIP   103136 a ratas sometidas a estr&eacute;s, se observ&oacute; la disminuci&oacute;n de la   hipersensibilidad visceral, mediante el procesamiento nociceptivo visceral a   niveles espinales y supraespinales, al hallar una disminuci&oacute;n de la   sobreexpresi&oacute;n de la prote&iacute;na Fos en estos niveles.</p>     <p><b>NUEVAS PERSPECTIVAS PARA EL ESTUDIO DEL EFECTO DE LOS PROBI&Oacute;TICOS EN EL ALIVIO DEL DOLOR ABDOMINAL </b></p>     <p>Hoy en d&iacute;a se acepta que existe una v&iacute;a de comunicaci&oacute;n   bidireccional entre el sistema nervioso central y el tracto gastrointestinal, y   se postula que el SII es una entidad multifactorial, donde existe una   disregulaci&oacute;n del eje cerebro-intestinal (66). Para poder conocer el mecanismo   de acci&oacute;n de los probi&oacute;ticos en el alivio del dolor abdominal ser&iacute;a necesario   poder dilucidar el efecto de los probi&oacute;ticos con efectos antinociceptivos en la   regulaci&oacute;n de este eje. Tal y como se muestra en esta revisi&oacute;n, se ha avanzado   mucho en los &uacute;ltimos 10 a&ntilde;os en esta direcci&oacute;n.</p>     ]]></body>
<body><![CDATA[<p>Las futuras investigaciones podr&iacute;an dirigirse al   estudio del efecto de la ingesta de ciertos probi&oacute;ticos en la regulaci&oacute;n de   diferentes sustancias, y de las c&eacute;lulas que han demostrado tener una   correlaci&oacute;n con el dolor abdominal, tal y como los mastocitos (67), las fibras   nerviosas del receptor vanilloide potencial transitorio 1 (68), la serotonina   (69), el factor neutr&oacute;fico derivado del cerebro (70) y la permeabilidad   intestinal (71), as&iacute; como las prote&iacute;nas de uni&oacute;n estrecha (72,73) y de adhesi&oacute;n   celular (74).</p>     <p>Con relaci&oacute;n a la permeabilidad intestinal, se hall&oacute;   una correlaci&oacute;n entre el dolor abdominal y la disminuci&oacute;n de las prote&iacute;nas de   uni&oacute;n estrecha JAM-A (72) y ocludina (73), en los pacientes con SII. En   animales el tratamiento con probi&oacute;ticos produjo una disminuci&oacute;n de la   hipersensibilidad visceral, acompa&ntilde;ada del restablecimiento de los niveles de   estas prote&iacute;nas de uni&oacute;n estrecha (59,63). Entonces, surge la pregunta: &iquest;podr&iacute;a   ser este uno de los factores que permitiera explicar el mecanismo de acci&oacute;n del   efecto antinociceptivo de los probi&oacute;ticos?</p>     <p>Otras posibles l&iacute;neas de investigaci&oacute;n podr&iacute;an   dirigirse a estudiar la relaci&oacute;n entre los efectos encontrados en los pacientes   con SII, tras la administraci&oacute;n de probi&oacute;ticos y el dolor abdominal. Entre   estos efectos se encontrar&iacute;an la disminuci&oacute;n de la permeabilidad del intestino   delgado (39) y la normalizaci&oacute;n de la respuesta inmune (44). Finalmente, la   cronicidad de este s&iacute;ntoma hace necesario estudiar el efecto de los probi&oacute;ticos   en la modulaci&oacute;n del dolor abdominal, en relaci&oacute;n a mecanismos neurales   centrales y a factores psicol&oacute;gicos (66), y ya se est&aacute;n dando los primeros   pasos en esa direcci&oacute;n (57,65).</p>     <p>En conclusi&oacute;n, hay una serie de cepas de probi&oacute;ticos (L.   plantarum DSM 9843 (299v), B. infantis 35624 y B. bifidum MIMBb75) y mezcla de   probi&oacute;ticos (B. lactis DN-173 010, S. thermophilus y L. bulgaricus; B. bifidum   BGN4, B. lactis AD011, L. acidophilus AD031 y L. casei IBS41; y L. acidophilus SDC   2012 y 2013) que han demostrado un aparente efecto antinociceptivo y que   parecen mejorar el dolor abdominal en ciertos subgrupos de pacientes con SII.   Tal vez, en un futuro no muy lejano, se puedan desarrollar f&oacute;rmulas magistrales   con estas cepas, para tratar este s&iacute;ntoma tan acuciante en algunos pacientes   con dicho trastorno funcional.</p>     <p><b>REFERENCIAS</b></p>     <!-- ref --><p>1. Longstreth GF, Thompson WG, Chey WD,   Houghton LA, Mearin F, Spiller RC. Functional bowel   disorders. Gastroenterology. 2006;130(5):1480-91.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000058&pid=S0120-9957201400020000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>2. Carroll IM, Ringel-Kulka T, Siddle JP,   Ringel Y. Alterations in composition and diversity of the intestinal microbiota   in patients with diarrhea-predominant irritable bowel syndrome. 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<numero>3</numero>
<issue>3</issue>
<page-range>316-25</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
