<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-0011</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med.]]></abbrev-journal-title>
<issn>0120-0011</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-00112015000200015</article-id>
<article-id pub-id-type="doi">10.15446/revfacmed.v63n2.48055</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia de los ácidos grasos poliinsaturados omega-3 y omega-6 de la dieta y de sus metabolitos en la respuesta inmune de tipo alérgico]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of dietary polyunsaturated omega-3 and omega-6 fatty acids and from its metabolites in the immune allergic response]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-Pájaro]]></surname>
<given-names><![CDATA[Deivis Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marrugo-Cano]]></surname>
<given-names><![CDATA[Javier A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Cartagena  ]]></institution>
<addr-line><![CDATA[Cartagena ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<volume>63</volume>
<numero>2</numero>
<fpage>301</fpage>
<lpage>313</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-00112015000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-00112015000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-00112015000200015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las tasas de prevalencia para las enfermedades alérgicas han incrementado en gran medida en los últimos cincuenta años, tanto en países desarrollados como en vías de desarrollo. En estos últimos, dicho incremento está representado principalmente por la población de niños y adolescentes; un evento que a su vez se concibe como un problema relevante de salud pública mundial. Varios factores han sido propuestos para explicar las causas de esta problemática, entre los que destaca la hipótesis de la dieta, señalando que componentes específicos de la alimentación y cambios en los patrones del mismo propiciarían el desarrollo de las alergias e influirían en el incremento de su prevalencia. En apoyo de lo anterior, la hipótesis de las grasas expone que paralelo al aumento de las alergias a nivel global, ha existido también un consumo excesivo de alimentos con alto contenido de ácidos grasos omega-6 y bajos en omega-3, principalmente en dietas occidentales y como resultado de intervenciones en prevención del riesgo cardiovascular, lo que en conjunto pudiera explicar parte de este fenómeno mundial. La evidencia a nivel epidemiológico y experimental muestra que ambas series de lípidos y varios de sus metabolitos ejercen un importante papel modulador en la patología alérgica, aspectos que serán abordados en la presente revisión temática.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The prevalence rates for allergic diseases has increased markedly in the last fifty years, both in developed and developing countries, in which, such increase is mainly represented by the population of children and teens, an event which in turn is conceived as a major public health problem worldwide. Many factors have been proposed trying to explain the causes of this problematic, among which highlights the diet hypothesis, pointing that specific components of feeding and changes in the patterns of the same, would promote the development of allergies and will influence the increase from its prevalence. In support of which, the fat hypothesis, showing that parallel to the rise in allergies worldwide, also has been an excessive consumption of foods with high content of omega-6 fatty acids and low in omega-3, mainly in western diets and as result of interventions in cardiovascular risk prevention, which together could explain part of this global phenomenon, aspects will be to board in the present thematic review.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Dieta]]></kwd>
<kwd lng="es"><![CDATA[Consumo de Alimentos]]></kwd>
<kwd lng="es"><![CDATA[Grasas en la dieta]]></kwd>
<kwd lng="es"><![CDATA[Hipersensibilidad a los Alimentos]]></kwd>
<kwd lng="es"><![CDATA[Alergia e Inmunología]]></kwd>
<kwd lng="en"><![CDATA[Fatty Acids]]></kwd>
<kwd lng="en"><![CDATA[Omega-3]]></kwd>
<kwd lng="en"><![CDATA[Fatty Acids]]></kwd>
<kwd lng="en"><![CDATA[Omega-6]]></kwd>
<kwd lng="en"><![CDATA[Dietary Fats]]></kwd>
<kwd lng="en"><![CDATA[Food Allergy]]></kwd>
<kwd lng="en"><![CDATA[Allergy and Immunology]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p>DOI: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.48055" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.48055</a></p>     <p>ART&Iacute;CULO DE REVISI&Oacute;N</p>     <p align="center"><font size="4"><b>Influencia de los &aacute;cidos grasos poliinsaturados omega-3 y omega-6 de la dieta y de sus metabolitos en la respuesta inmune de tipo al&eacute;rgico</b></font></p>     <p align="center"><font size="3"><b><I>Influence of dietary polyunsaturated omega-3 and omega-6 fatty acids and from its metabolites in the immune allergic response</I></b></font></p>     <p align="center">Deivis Javier Villanueva-P&aacute;jaro<Sup>1</Sup>,; Javier A. Marrugo-Cano<Sup>1</Sup></p>     <p><Sup>1</Sup> L&iacute;nea de Investigaci&oacute;n en Alergias a los Alimentos, Grupo Alergolog&iacute;a Experimental e Inmunogen&eacute;tica, Instituto de Investigaciones Inmunol&oacute;gicas, Universidad de Cartagena. Cartagena, Colombia.</p>     <p>Correspondencia: Deivis Javier Villanueva-P&aacute;jaro, Universidad de Cartagena, Avenida del Consulado, Zaragocilla, Carrera 50 No. 29-11. Campus de la Salud, Primer Piso de la Biblioteca. Tel&eacute;fono: +57-3105633297. Instituto de Investigaciones Inmunol&oacute;gicas, Cartagena, Colombia. Correo electr&oacute;nico: <a href="mailto:deivisjavier.29@gmail.com">deivisjavier.29@gmail.com</a>.</p>     <p align="center">Recibido: 28/12/2014  Aceptado:18/03/2015</p> <hr>     <p><b>Resumen</b></p>       ]]></body>
<body><![CDATA[<p>Las tasas de prevalencia para las enfermedades al&eacute;rgicas han incrementado en gran medida en los &uacute;ltimos cincuenta a&ntilde;os, tanto en pa&iacute;ses desarrollados como en v&iacute;as de desarrollo. En estos &uacute;ltimos, dicho incremento est&aacute; representado principalmente por la poblaci&oacute;n de ni&ntilde;os y adolescentes; un evento que a su vez se concibe como un problema relevante de salud p&uacute;blica mundial. Varios factores han sido propuestos para explicar las causas de esta problem&aacute;tica, entre los que destaca la hip&oacute;tesis de la dieta, se&ntilde;alando que componentes espec&iacute;ficos de la alimentaci&oacute;n y cambios en los patrones del mismo propiciar&iacute;an el desarrollo de las alergias e influir&iacute;an en el incremento de su prevalencia.</p>     <p>En apoyo de lo anterior, la hip&oacute;tesis de las grasas expone que paralelo al aumento de las alergias a nivel global, ha existido tambi&eacute;n un consumo excesivo de alimentos con alto contenido de &aacute;cidos grasos omega-6 y bajos en omega-3, principalmente en dietas occidentales y como resultado de intervenciones en prevenci&oacute;n del riesgo cardiovascular, lo que en conjunto pudiera explicar parte de este fen&oacute;meno mundial. La evidencia a nivel epidemiol&oacute;gico y experimental muestra que ambas series de l&iacute;pidos y varios de sus metabolitos ejercen un importante papel modulador en la patolog&iacute;a al&eacute;rgica, aspectos que ser&aacute;n abordados en la presente revisi&oacute;n tem&aacute;tica.</p>     <p><B>Palabras clave: </B>Dieta; Consumo de Alimentos; Grasas en la dieta, Hipersensibilidad a los Alimentos; Alergia e Inmunolog&iacute;a (DeCS).</p> <hr>     <p><B>Villanueva-P&aacute;jaro DJ, Marrugo-Cano JA.</B> Influencia de los &aacute;cidos grasos poliinsaturados omega-3 y omega-6 de la dieta y de sus metabolitos en la respuesta inmune de tipo al&eacute;rgico. Rev. Fac. Med. 2015;63(2):301-13. doi: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.48055" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.48055</a>.</p> <hr>     <p><b>Summary</b></p>      <p>The prevalence rates for allergic diseases has increased markedly in the last fifty years, both in developed and developing countries, in which, such increase is mainly represented by the population of children and teens, an event which in turn is conceived as a major public health problem worldwide. Many factors have been proposed trying to explain the causes of this problematic, among which highlights the diet hypothesis, pointing that specific components of feeding and changes in the patterns of the same, would promote the development of allergies and will influence the increase from its prevalence. In support of which, the fat hypothesis, showing that parallel to the rise in allergies worldwide, also has been an excessive consumption of foods with high content of omega-6 fatty acids and low in omega-3, mainly in western diets and as result of interventions in cardiovascular risk prevention, which together could explain part of this global phenomenon, aspects will be to board in the present thematic review.</p>     <p><B>Keywords: </B>Fatty Acids, Omega-3; Fatty Acids, Omega-6; Dietary Fats; Food Allergy; Allergy and Immunology (MeSH).</p> <hr>     <p><B>Villanueva-P&aacute;jaro DJ, Marrugo-Cano JA.</B> &#91;Influence of dietary polyunsaturated omega-3 and omega-6 fatty acids and from its metabolites in the immune allergic response&#93;. Rev. Fac. Med. 2015;63(2):301-13. Spanish. doi: <a href="http://dx.doi.org/10.15446/revfacmed.v63n2.48055" target="_blank">http://dx.doi.org/10.15446/revfacmed.v63n2.48055</a>.</p> <hr>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>      <p>Las enfermedades al&eacute;rgicas han experimentado un incremento relevante en sus tasas de prevalencia durante los &uacute;ltimos cincuenta a&ntilde;os, siendo notable tanto en pa&iacute;ses desarrollados como en v&iacute;as de desarrollo (1), en los cuales, gran parte de la poblaci&oacute;n afectada est&aacute; representada por ni&ntilde;os y adolescentes (2,3), en quienes particularmente se ha apreciado una mayor tendencia al aumento en dichas patolog&iacute;as durante los &uacute;ltimos veinte a&ntilde;os (4,5).</p>     ]]></body>
<body><![CDATA[<p>Seg&uacute;n estimaciones de la Organizaci&oacute;n Mundial de la Salud (OMS) para el a&ntilde;o 2011, entre el 20% y 30% de la poblaci&oacute;n mundial padec&iacute;a alguna enfermedad al&eacute;rgica (1). Sin embargo, en 2013 la Organizaci&oacute;n Mundial de Alergias (WAO) estim&oacute; que la prevalencia de alergias ascend&iacute;a al 40% en poblaci&oacute;n general (6). Este grupo de afecciones, adem&aacute;s de generar importante morbi-mortalidad, ocasionan enormes gastos en atenci&oacute;n en salud que deterioran el patrimonio econ&oacute;mico de la sociedad en general, traduci&eacute;ndose en un problema mayor de salud p&uacute;blica mundial (6,7).</p>     <p>Estudios epidemiol&oacute;gicos muestran a Latinoam&eacute;rica como una de las regiones del mundo, con las tasas de prevalencia m&aacute;s altas para alergias (5,8), con cifras incluso cercanas a las reportadas por pa&iacute;ses desarrollados, ej., Australia, Nueva Zelanda, Reino Unido y EE.UU, a pesar de las notables diferencias entre los niveles socioecon&oacute;micos y las condiciones de vida de estos pa&iacute;ses (2). Con respecto a Colombia, dos estudios de corte transversal publicados en 2012 reportaron cifras altas de prevalencia para alergias (9, 10), que evidencian un incremento importante de tales condiciones tras comparar con reportes de a&ntilde;os anteriores (11,12). Hallazgos que correlacionan con las prevalencias descritas para estas patolog&iacute;as en otros pa&iacute;ses, e.g., Argentina, Costa Rica, Chile, M&eacute;xico y Panam&aacute; (5,8).</p>     <p>Con el fin de explicar el incremento mundial y las diferencias geogr&aacute;ficas en las prevalencias de las alergias, han sido propuestos varios factores, entre los que destacan: la contaminaci&oacute;n ambiental y el cambio clim&aacute;tico (13); la alteraci&oacute;n y/o p&eacute;rdida de la biodiversidad (14); el acelerado desarrollo econ&oacute;mico y urban&iacute;stico; el auge migratorio de individuos desde &aacute;reas rurales hacia urbanas (7,15); los cambios en los patrones socioculturales y del estilo de vida (1); los h&aacute;bitos de higiene, la susceptibilidad gen&eacute;tica del hu&eacute;sped, enfermedades de base, deficiente estimulaci&oacute;n del sistema inmune, terapia antimicrobiana y antial&eacute;rgica (14,16); la exposici&oacute;n vital temprana a las influencias ambientales (15, 17); las modificaciones epigen&eacute;ticas en infancia y adultez (18, 19); el estr&eacute;s oxidativo (20); y los cambios en los patrones de la dieta (19,21).</p>     <p>Esta &uacute;ltima presunci&oacute;n se enmarca en la hip&oacute;tesis de la dieta, la cual expone que el contenido de varios micro y macronutrientes de la alimentaci&oacute;n, as&iacute; como los cambios en los patrones dietarios influir&iacute;an en la prevalencia y severidad de las alergias (22,23). En apoyo de lo cual, estudios epidemiol&oacute;gicos han descrito amplias variaciones en la prevalencia de atopia y de alergias entre grupos poblacionales con distintos patrones dietarios, por ejemplo, dieta rural y urbana (15), donde por ejemplo; el alto consumo de vitaminas A y E, vegetales verdes y pescado se asocian inversamente con el desarrollo de enfermedades al&eacute;rgicas en ni&ntilde;os (24). Similarmente, la dieta mediterr&aacute;nea, rica en fibra, antioxidantes, grasas cis-monoinsaturadas y baja relaci&oacute;n &Omega;6:&Omega;3, parece conferir protecci&oacute;n contra el desarrollo de sibilancias en ni&ntilde;os preescolares (25). En contraste, la suplementaci&oacute;n de lactantes con altas dosis de vitamina D se traduce en factor de riesgo de padecer alergias respiratorias en etapas vitales posteriores (26).</p>     <p>En soporte de la anterior hip&oacute;tesis, encontramos la hip&oacute;tesis de las grasas (27), advirtiendo que paralelo al incremento mundial de las alergias observado en las &uacute;ltimas d&eacute;cadas, ha existido un consumo excesivo de alimentos fuentes y ricos en omega-6 y con bajo contenido de omega-3, principalmente en dietas occidentales y como resultado de intervenciones en prevenci&oacute;n del riesgo cardiovascular, postulando a este fen&oacute;meno como una de las causas de la problem&aacute;tica referida en todo el mundo (23). Este v&iacute;nculo se valida al reconocer que la ingesta dietaria influencia la biodisponibilidad celular y sist&eacute;mica de las grasas (28), demarca su metabolismo y facilita la interacci&oacute;n con c&eacute;lulas de la inmunidad, influyendo en su funci&oacute;n (29) y, en la participaci&oacute;n de estas, en varios procesos inflamatorios inmunes, incluyendo las alergias (30).</p>     <p>Actualmente, se postula que una dieta rica en &Omega;6 y baja en &Omega;3 condicionar&iacute;a una menor producci&oacute;n de mediadores anti-inflamatorios y pro-resolutores de la inflamaci&oacute;n derivados de los &Omega;3 (31), y a su vez, propiciar&iacute;a una mayor producci&oacute;n de mediadores pro-inflamatorios derivados de los &Omega;6 (32) y con ello, el inicio y amplificaci&oacute;n de la respuesta al&eacute;rgica (33). Por tanto, el objetivo de la presente revisi&oacute;n tem&aacute;tica es describir la evidencia epidemiol&oacute;gica y b&aacute;sica experimental, concerniente al impacto que ejercen los &aacute;cidos grasos omega-3 y 6 de la dieta y de algunos de sus metabolitos en la modificaci&oacute;n de la respuesta inmune de tipo al&eacute;rgico.</p>     <p><B>Impacto de los &aacute;cidos grasos poliinsaturados omega-3 y omega-6 de la dieta y de sus metabolitos en las enfermedades al&eacute;rgicas</b></p>      <p>En argumento de la hip&oacute;tesis de las grasas y de su papel en las enfermedades al&eacute;rgicas, estudios epidemiol&oacute;gicos han mostrado por ejemplo que: El bajo consumo de &aacute;cidos grasos &Omega;3 totales y &alpha;-linol&eacute;nico (ALA) desde el octavo mes del embarazo, se asoci&oacute; con un alto riesgo de padecer asma en la descendencia a la edad de 5 a&ntilde;os (&Omega;3 totales HR 1.66 p=0.036 IC 95%; 1.11-2.48, ALA HR 1.67 p=0.022 IC 95%; 1.12-2.48, Regresi&oacute;n log&iacute;stica de Cox, &chi;2 de Wald), mientras que un bajo consumo del omega-6, araquidonato (AA) y un alto consumo de grasas saturadas totales (SFA) y &aacute;cido palm&iacute;tico (AP), disminuyeron el riesgo de la enfermedad (AA HR 0.52 p=0.025 IC 95%; 0.32-0.84, SFA HR 0.55 p=0.008 IC 95%; 0.34-0.90, AP HR 0.51 p=0.003 IC 95%; 0.31-0.83) (34).</p>     <p>As&iacute; mismo, se ha observado que la elevada ingesta de EPA solo o combinado con el &aacute;cido graso docosahexaen&oacute;ico (DHA) &mdash;desde las semanas 15 a 39 de gestaci&oacute;n&mdash; redujo el riesgo de sibilancias m&aacute;s no de eccema en infantes entre los 23 a 29 meses de edad (EPA solo y EPA+DHA ORadj 0.70 p=0.02, IC 95%; 0.49-1.04, Regresi&oacute;n Log&iacute;stica) (35). De igual forma, el alto consumo de ALA y DHA durante cualquier etapa gestacional se ha asociado con un menor riesgo de sibilancias, pero no de eccema en infantes entre los 16 a 24 meses de edad (ALA ORadj 0.52 p=0.04 IC 95%; 0.28-0.97, DHA ORadj 0.37 p&lt;0.05 IC 95%; 0.15-0.91, Regresi&oacute;n Log&iacute;stica). En contraste, la ingesta elevada de &Omega;6 totales y de Linoleato (LA), durante el mismo periodo, se relacion&oacute; con eccema pero no con sibilancias en infantes a la misma edad (&Omega;6 totales OR 2.25 p=0.01 IC 95%; 1.13-4.54, LA OR 2.11 p=0.03 IC 95%; 1.06-4.26) (36).</p>     <p>Igualmente, el consumo regular de aceite de pescado con alto contenido de EPA y DHA, desde el tercer trimestre de gestaci&oacute;n, redujo la prevalencia de sibilancias durante los primeros 18 meses de vida de la progenie (-9.8%, p=0.02, IC 95%; 1.5-18.1, &chi;2 de Pearson) (37) y disminuy&oacute; el riesgo de sensibilizaci&oacute;n (RS) y de enfermedades al&eacute;rgicas (EA) en infantes a los 4 a&ntilde;os de edad (RS y EA ORadj 0.76, p&lt;0.01, IC 95%; 0.58-1.0, Regresi&oacute;n Lineal) (38). Incluso, la suplementaci&oacute;n con altas dosis de &Omega;3 totales al finalizar el embarazo, result&oacute; en reducci&oacute;n del asma no at&oacute;pico (-63%, p=0.03, IC 95%; 8-85%, Regresi&oacute;n Log&iacute;stica de Cox) y de asma at&oacute;pico (-87%, p=0.01, IC 95%; 40-97%) en la descendencia a la edad de 16 a&ntilde;os (39).</p>     ]]></body>
<body><![CDATA[<p>Adicionalmente, aquellos hijos de madres at&oacute;picas que recibieron alto contenido de &Omega;3 totales, elevada relaci&oacute;n &Omega;3:&Omega;6 y grasas trans en leche materna tuvieron menor prevalencia de eccema al a&ntilde;o de edad (&Omega;3 totales, &Omega;3:&Omega;6 y trans, p&lt;0.05, &chi;2 de Pearson), as&iacute; como de asma at&oacute;pico (&Omega;3:&Omega;6 totales y DHA OR 0.39, p&lt;0.05, IC 95%; 0.16-1.0, Regresi&oacute;n Log&iacute;stica) y de s&iacute;ntomas al&eacute;rgicos a la edad de 4 a&ntilde;os (ALA:LA OR 0.48, p&lt;0.05) (40).</p>     <p>Por otra parte, la suplementaci&oacute;n durante 3 semanas con aceite de pescado con gran cantidad de &Omega;3, redujo significativamente la severidad de la broncoconstricci&oacute;n, inducida por el ejercicio (BIE) en atletas de &eacute;lite, al reducir la inflamaci&oacute;n de v&iacute;as a&eacute;reas, mejorar la funci&oacute;n pulmonar (% cambio FEV1 pre-post ejercicio p&lt;0.017, ANOVA 2x2) y disminuir el uso de broncodilatadores (p&lt;0.05), relacionado con un marcado incremento en el contenido de EPA y reducidos en los de LA y AA en membranas de neutr&oacute;filos de sangre perif&eacute;rica (EPA p&lt;0.025, LA y AA p&lt;0.01); acompa&ntilde;ado de una disminuci&oacute;n en los niveles plasm&aacute;ticos de LTE4, TNF-&alpha; e IL-1&beta;, as&iacute; como de metabolitos derivados de la PGD2, e.g., 9&alpha;-PGF2, 11&beta;-PGF2, en orina (p&lt;0.017) (41).</p>     <p>Estos hallazgos fueron confirmados en un estudio posterior, que adem&aacute;s revel&oacute; que este tipo de suplementaci&oacute;n en adultos asm&aacute;ticos con BIE, redujo de forma significativa el uso de broncodilatador (45 puff p&lt;0.05 IC 95%; 34 puff-51 puff, versus 61 puff, IC 95%; 53 puff-68 puff dieta com&uacute;n y 65 puff IC 95%; 56-72 puff dieta placebo, ANOVA 2x2), asociado con disminuci&oacute;n en los niveles de LTC4, LTE4, PGD2, IL-1&beta; y TNF-&alpha; en sobrenadantes de muestras de esputo, del conteo diferencial de eosin&oacute;filos y neutr&oacute;filos y del incremento en el n&uacute;mero de macr&oacute;fagos alveolares en esputo inducido antes y despu&eacute;s del ejercicio (p&lt;0.05), acompa&ntilde;ado de reducci&oacute;n en la generaci&oacute;n de LTB4 y aumento de LTB5 (p&lt;0.05); as&iacute; como de disminuci&oacute;n en los niveles de LA y AA frente al incremento en el contenido de EPA y DHA en neutr&oacute;filos de sangre perif&eacute;rica antes y despu&eacute;s del ejercicio (p&lt;0.05) (42).</p>     <p>En forma similar, la suplementaci&oacute;n dietaria con &Omega;3 en adultos j&oacute;venes con asma at&oacute;pico suprimi&oacute; la inflamaci&oacute;n bronquial inducida por la inhalaci&oacute;n repetida de bajas dosis de al&eacute;rgenos de &aacute;caros del polvo dom&eacute;stico, verificado por supresi&oacute;n en la generaci&oacute;n in vitro de cistein&iacute;l-leucotrienos (2.889 &plusmn; 872 vs. 1.120 &plusmn; 173 ng/ml, p&lt;0.05, ANOVA), &oacute;xido n&iacute;trico exhalado (eNO antes del reto bronquial p=0.014, eNO despu&eacute;s del reto bronquial p=0.022, grupo suplementado), prote&iacute;na cati&oacute;nica eosinof&iacute;lica (PCE 20.5&plusmn;9.93 vs. &ndash;1.68&plusmn;4.36 ng/ml, p&lt;0.05) y reducido conteo de eosin&oacute;filos en sangre perif&eacute;rica (10.1&plusmn;0.1.84 vs. 5.79&plusmn;0.69%, p&lt;0.05) (43).</p>     <p>Al mismo tiempo se evidencia que adultos j&oacute;venes con asma al&eacute;rgico, incluyendo aquellos que consum&iacute;an pescado de mar con baja frecuencia, pose&iacute;an menor contenido de &Omega;3 totales en membrana de hemat&iacute;es que controles (Q25 &Omega;3:&Omega;6 totales p=0.038, U de Mann-Whitney), relacionado con mayores hiperrespuestas bronquiales (Q25 Mediana PD20 0.15&plusmn;0.08 ESM vs. Q75 Mediana PD20 0.27&plusmn;0.03 ESM p&lt;0.05, Rangos de Wilcoxon) y niveles de &oacute;xido n&iacute;trico exhalado (eNO Q25 Mediana 35.4&plusmn;5.95 ESM vs. eNO Q75 Mediana 13.0&plusmn;2.09 ESM p=0.040) frente a aero-alergenos y mayor severidad del asma versus asm&aacute;ticos al&eacute;rgicos y sujetos control que consum&iacute;an con mayor frecuencia pescado de mar (44).</p>     <p>De otra forma, la suplementaci&oacute;n dietaria con el &aacute;cido graso &Omega;6 &gamma;-linol&eacute;nico (GLA) en altas dosis, contenido en el aceite de Oenothera seminis oleum, en infantes y adultos con dermatitis at&oacute;pica, permiti&oacute; apreciar una notable reducci&oacute;n en los puntajes de severidad cl&iacute;nica asociados a dermatitis at&oacute;pica (SCORAD), dependiente del tiempo de exposici&oacute;n (basal vs. 4 semanas p=0.002 y basal vs. 12 semanas p=0.001, Rangos de Wilcoxon) (45). Hallazgos que soportan la concepci&oacute;n de que algunos &Omega;6 dietarios espec&iacute;ficos y varios de sus metabolitos (poco o a&uacute;n no caracterizados), pudieran ejercer potentes efectos terap&eacute;uticos sobre esta afecci&oacute;n en el mediano y largo plazo.</p>     <p>De igual manera, la suplementaci&oacute;n dietaria de ratones transg&eacute;nicos Fat-1 heterocig&oacute;ticos con altas dosis de &Omega;3 totales, favoreci&oacute; la incorporaci&oacute;n de EPA y DHA en tejido pulmonar (EPA Media 146.7&plusmn;29.9 ESM p&lt;0.001 y DHA Media 520.4&plusmn;54.8 ESM p&lt;0.0001, T de Student) y a su vez, la s&iacute;ntesis de mol&eacute;culas pro-resolutoras de la inflamaci&oacute;n, e.g., Resolvina E1 y Protectina D1 (RvE1 p&lt;0.001 y PD1 p&lt;0.01), derivados de EPA y DHA respectivamente. Eventos relacionados con disminuci&oacute;n en la relaci&oacute;n AA:(EPA+DHA) en tejido pulmonar (p&lt;0.001), del recuento absoluto de c&eacute;lulas y de eosin&oacute;filos, as&iacute; como de citoquinas y quimioquinas pro-inflamatorias en fluido bronco-alveolar (todas p&lt;0.05) posterior a las fases de sensibilizaci&oacute;n y de reto con OVA, traduci&eacute;ndose en supresi&oacute;n marcada de respuestas al&eacute;rgicas en v&iacute;as a&eacute;reas (46).</p>     <p>Similarmente, la administraci&oacute;n i.p de RvE1 en ratones BALB/c result&oacute; tener una notable reducci&oacute;n del grado de bronco-constricci&oacute;n inducida por metacolina (ca&iacute;da del Penh p&lt;0.01, Kruskal-Wallis), del infiltrado de eosin&oacute;filos y linfocitos en regi&oacute;n peribronquial, del conteo absoluto de leucocitos, principalmente de eosin&oacute;filos y linfocitos (p&lt;0.01) y de los niveles de IL-13 en muestras de lavado bronco-alveolar en ratones sensibilizados y retados con OVA (p&lt;0.01). Adicionalmente, redujo la producci&oacute;n de moco y los niveles s&eacute;ricos de IgE espec&iacute;ficos de OVA (ambos p&lt;0.05) (47).</p>     <p>Posteriormente se demostr&oacute; que la administraci&oacute;n i.p de RvE1, en ratones BALB/c durante cualquier fase del proceso inflamatorio al&eacute;rgico pulmonar (sensibilizaci&oacute;n con OVA, sensibilizaci&oacute;n y/o reto con OVA), disminuy&oacute; notoriamente las hiperrespuestas de v&iacute;as a&eacute;reas inducidas por metacolina (ca&iacute;da del Penh p&lt;0.01, Kruskal-Wallis y U de Mann-Whitney), as&iacute; como la infiltraci&oacute;n pulmonar de eosin&oacute;filos y linfocitos, el grado de inflamaci&oacute;n y los niveles de IL-4, IL-5, IL-13, RANTES y de IgE OVA-espec&iacute;fica en fluido bronco-alveolar (p&lt;0.01, Kruskal-Wallis) (48).</p>     <p>De modo similar, la administraci&oacute;n I.V. de RvE1 en bajas dosis (100-200 ng), antes y despu&eacute;s del reto con OVA en ratones FVB con dieta baja en &Omega;3 result&oacute; en disminuci&oacute;n del n&uacute;mero absoluto de leucocitos, de los niveles de LTB4, IL-6, IL-17A, IL-23 e IL-27 y el incremento de LXA4 e INF-&gamma; en fluido bronco-alveolar (todos p&lt;0.05, T de Student). As&iacute; mismo, redujo el grado de infiltraci&oacute;n leucocitaria, la reactividad de c&eacute;lulas del epitelio pulmonar y la producci&oacute;n de moco, previno el incremento de la resistencia pulmonar inducida por metacolina (p&lt;0.05, ANOVA 1 v&iacute;a), redujo a la mitad el intervalo de resoluci&oacute;n end&oacute;gena inflamatoria y aceler&oacute; el proceso de resoluci&oacute;n natural posterior a la fase de sensibilizaci&oacute;n y de reto con OVA (p&lt;0.05, T de Student), sin alterar los niveles s&eacute;ricos de PGD2 y de IgE (49). Tambi&eacute;n se observ&oacute; que RvE1, a pesar de ser contra-regulada in vivo en su acci&oacute;n por IL-17, indujo la producci&oacute;n de LXA4, la que a su vez contra-regula v&iacute;as que promueven la diferenciaci&oacute;n y supervivencia de c&eacute;lulas TH17 en el pulm&oacute;n, en una forma independiente de IL-27 (49).</p>     ]]></body>
<body><![CDATA[<p>Adem&aacute;s, la administraci&oacute;n repetida de RvE1 v&iacute;a i.p en ratones NC/Nga atenu&oacute; el desarrollo de lesiones cut&aacute;neas similares a la dermatitis at&oacute;pica humana (p&lt;0.05, T de Student), tras inducir supresi&oacute;n dosis dependiente sobre la producci&oacute;n de IgE total y de IgE espec&iacute;fica de DNP (2,4-dinitrofluorobenceno) por c&eacute;lulas B y de INF-&gamma; e IL-4 en c&eacute;lulas T CD4+ activadas y redujo el grado de infiltraci&oacute;n de c&eacute;lulas T CD4+ y CD8+ en las lesiones cut&aacute;neas (p&lt;0.05, ANOVA 1 v&iacute;a) (50).</p>     <p>Sumado a ello, la suplementaci&oacute;n de ratones NC/Nga con aceite de pescado rico en &Omega;3 mostr&oacute; reducir los puntajes de severidad cl&iacute;nica asociados a dermatitis at&oacute;pica (SCORAD) (p&lt;0.05, ANOVA 1 v&iacute;a), el engrosamiento de la dermis/epidermis, el grado de infiltraci&oacute;n de mastocitos y eosin&oacute;filos, as&iacute; como el n&uacute;mero de mastocitos activados y expresando GATA-1 en lesiones cut&aacute;neas (p&lt;0.05), relacionado con reducci&oacute;n en la producci&oacute;n de citoquinas TH2 en mastocitos, en parte al regular a la baja el nivel transcripcional de genes para citoquinas TH2 y el nivel post-traduccional de los factores de transcripci&oacute;n GATA-1 y 2 en estas c&eacute;lulas (51).</p>     <p>An&aacute;logamente, se observ&oacute; que el tratamiento oral de ratones BALB/c con &aacute;cido linol&eacute;ico conjugado (c9, t11-CLA), un is&oacute;mero del &Omega;6 Linoleato, favoreci&oacute; su incorporaci&oacute;n en el tejido pulmonar, reduciendo la producci&oacute;n de moco y de IL-5 (p=0.035) antes y durante la inmunizaci&oacute;n, la respuesta espec&iacute;fica de anticuerpos contra alergenos dependiente de TH1 (IgG2a -76%, p=0.018, IC 95%, ANOVA 1 v&iacute;a) y de TH2 (IgE -42.1% p=0.185, IgG1 -31.8% p=0.048), as&iacute; como la infiltraci&oacute;n eosinof&iacute;lica pulmonar (p=0.02) y las hiperrespuestas de v&iacute;as a&eacute;reas (p=0.018), en una forma mediada por la expresi&oacute;n y mecanismos de acci&oacute;n del receptor PPAR-&gamma; (52). Esto sirve para indicar que no todos los &Omega;6 son pro-alerg&eacute;nicos y que es posible que existan muchos integrantes de esta serie, a&uacute;n sin caracterizar, que representen potencial modulador en las reacciones al&eacute;rgicas.</p>     <p>A pesar del creciente cuerpo de evidencia epidemiol&oacute;gica y experimental que respalda los efectos ben&eacute;ficos de los &Omega;3 y sus metabolitos, y delet&eacute;reos de la mayor&iacute;a de precursores &Omega;6 y sus eicosanoides en modificar la patolog&iacute;a al&eacute;rgica, los resultados de algunos estudios son controversiales, al mostrar por ejemplo que: hijos de madres at&oacute;picas que recibieron alto contenido de &Omega;3 totales y elevada relaci&oacute;n &Omega;3:&Omega;6 &mdash;durante su lactancia&mdash; no redujeron su riesgo de sensibilizaci&oacute;n, y que la ingesta elevada de ALA en leche de gestantes no at&oacute;picas se asoci&oacute; con sensibilizaci&oacute;n en sus hijos a los 4 a&ntilde;os de edad (OR 2.43, p&lt;0.05, IC 95%; 1.01-5.88, Regresi&oacute;n Log&iacute;stica) (40).</p>     <p>Adicionalmente, la elevada ingesta de &Omega;3 totales, DHA y DPA, presentes en la leche de gestantes at&oacute;picas, no brind&oacute; efectos protectores contra el desarrollo de sensibilizaci&oacute;n en sus hijos a los 6 meses y dos a&ntilde;os de edad, sino que pareci&oacute; asociarse con el riesgo de atopia en los reci&eacute;n nacidos (&Omega;3 totales, DHA y DPA p&lt;0.01, T de Student) (53). Adem&aacute;s, la ingesta de poliinsaturados totales y &Omega;6 totales se asoci&oacute; con incrementado riesgo de sibilancias en ni&ntilde;os y adolescentes (PUFA totales ORadj 1.19 p=0.04 IC 95%; 1.05-1.35, &Omega;6 totales OR 1.19 p=0.02 IC 95%; 1.04-1.35, Regresi&oacute;n Log&iacute;stica), mientras que Linoleato mostr&oacute; asociaci&oacute;n positiva con sibilancias y asma (LA ORadj 1.20 p=0.02, IC 95%; 1.06-1.37) (54).</p>     <p>Finalmente, se reporta que la suplementaci&oacute;n con &Omega;3 y &Omega;6 no result&oacute; &uacute;til como estrategia primaria para reducir el riesgo de sensibilizaci&oacute;n o de enfermedades al&eacute;rgicas en la infancia (&Omega;3 y eccema RR 1.10 p=0.578 IC 95%; 0.78-1.54, &Omega;3 y asma RR 0.81 p=0.348 IC 95%; 0.53-1.25, &Omega;3 y rinitis RR 0.80 p=0.618 IC 95%; 0.34-1.89, &Omega;3 y alergia a alimentos RR 0.51 p=0.41 IC 95%; 0.10-2.55, &Omega;6 y eccema RR 0.80 p=0.239 IC 95%; 0.56-1.16, Prueba de Heterogeneidad &chi;2) (55). Y tampoco brind&oacute; efectos protectores contra el desarrollo de asma en ni&ntilde;os (56) y adultos (57), ni en modificar la severidad del asma en ni&ntilde;os (58). Resultados que requerir&aacute;n un an&aacute;lisis m&aacute;s detallado del metabolo-lipidoma y de su control gen&eacute;tico, a fin de comprender de manera integral el impacto de los PUFA dietarios sobre los mecanismos celulares y moleculares subyacentes en la patofisiolog&iacute;a de las alergias y as&iacute; esclarecer estos hallazgos al parecer contradictorios.</p>     <p><B>Ingesta dietaria y niveles biol&oacute;gicos de omega-3 y 6 asociados con riesgo de desarrollar sensibilizaci&oacute;n at&oacute;pica y enfermedades al&eacute;rgicas</b></p>      <p>Algunos estudios se&ntilde;alan que la dosis y frecuencia de consumo dietario de los &aacute;cidos grasos &Omega;6 y en menor medida los &Omega;3, as&iacute; como sus niveles de incorporaci&oacute;n y biodisponibilidad celular y sist&eacute;micos, se relacionan con la sensibilizaci&oacute;n at&oacute;pica, el desarrollo de s&iacute;ntomas y el estado de severidad de las enfermedades al&eacute;rgicas en diversos grupos poblacionales (59). Mismos que hoy d&iacute;a nos permiten hacer una aproximaci&oacute;n te&oacute;rica a la problem&aacute;tica referida, mediante el an&aacute;lisis de los resultados descritos a la fecha, a trav&eacute;s de las distintas etapas et&aacute;reas en el humano.</p>     <p>Una primera l&iacute;nea de evidencia surge de un estudio transversal por Beck <I>et al. </I>(60) al mostrar que al finalizar el periodo de gestaci&oacute;n, ocurre una elevada utilizaci&oacute;n metab&oacute;lica de los &Omega;6 totales y de araquidonato (AA) y docosatetraenoato (DTA), incluso mayor a la de &Omega;3 totales y de ALA, EPA y DHA, principalmente en reci&eacute;n nacidos en alto riesgo de atopia (&Omega;6 totales Mediana 16.26 &micro;g/100&micro;L-1 p&lt;0.01, AA Mediana 8.32 &micro;g/100&micro;L-1 p&lt;0.01, DTA Mediana 0.43 &micro;g/100 &micro;L-1 p&lt;0.05, U de Mann-Whitney). Un evento que sugiere la existencia de diferencias inter-individuales en el control metab&oacute;lico de ambas series de l&iacute;pidos, conferidas a nivel gen&eacute;tico y/o epigen&eacute;tico, que pudieran traducirse en un importante factor de riesgo para el desarrollo de atopia, as&iacute; como para el inicio vital m&aacute;s temprano de las reacciones al&eacute;rgicas en individuos predispuestos (60).</p>     <p>En relaci&oacute;n a lo cual, un estudio de cohorte prospectivo en poblaci&oacute;n finesa por Nwaru <I>et al.</I> (61) revel&oacute; que el alto consumo dietario de mantequilla y mantequillas de esparcir &laquo;ricas en grasas saturadas&raquo; y la alta relaci&oacute;n &Omega;6:&Omega;3 totales, durante los primeros 8 meses de gestaci&oacute;n en maternas no at&oacute;picas, se asoci&oacute; con elevado riesgo de padecer rinitis al&eacute;rgica en la descendencia a la edad de 5 a&ntilde;os (Mantequillas HR 1.33 p&lt;0.05 IC 95%; 1.03-1.71, &Omega;6:&Omega;3 totales HR 1.37 p&lt;0.05 IC 95%; 1.07-1.77, Regresi&oacute;n Log&iacute;stica de Cox). Mientras que un elevado consumo de PUFA totales y de ALA redujo este riesgo (PUFA totales HR 0.71 p&lt;0.05 IC 95%; 0.52-0.96, ALA HR 0.73 p&lt;0.05 IC 95%; 0.54-0.98) (61).</p>     ]]></body>
<body><![CDATA[<p>Similarmente, un estudio de cohorte prospectivo por Barman <I>et al.</I> (62) muestra que individuos suecos con alergias respiratorias y eccema at&oacute;pico a los 13 a&ntilde;os de edad presentaron al nacer mayores niveles de PUFA totales, &Omega;3 y &Omega;6 totales, DPA &Omega;3, DHA, AA, EDA y 22:4n-6 en fosfol&iacute;pidos del suero de cord&oacute;n umbilical versus controles (todos p&lt;0.001, U de Mann-Whitney), asociado positivamente con el desarrollo vital m&aacute;s temprano de sensibilizaci&oacute;n (Q4 PUFA totales p=0.002, Q4 &Omega;6 totales p=0.043, Q4 &Omega;3 totales p=0.067, Curvas Kaplan-Meier) y con riesgo de sensibilizaci&oacute;n y s&iacute;ntomas respiratorios al&eacute;rgicos en la adolescencia (PUFA y &Omega;3 totales Ptrend&lt;0.001 y &Omega;6 totales Ptrend=0.001, Prueba de &chi;2). Estos autores plantean que la exposici&oacute;n vital temprana a los PUFA dietarios retrasar&iacute;a la maduraci&oacute;n del sistema inmune en el infante y con ello, el desarrollo de tolerancia a ant&iacute;genos inocuos, predisponiendo as&iacute; al desarrollo de sensibilizaci&oacute;n y de alergias en la infancia y la adolescencia (62).</p>     <p>Por otro lado, Prescott <I>et al</I>. (63) en un estudio longitudinal doble-ciego placebo controlado en poblaci&oacute;n australiana, describen que la suplementaci&oacute;n con aceite de pescado rico en &Omega;3 totales desde la semana 20 de gestaci&oacute;n hasta el parto, se&ntilde;al&oacute; un incremento en los niveles de EPA (Media &plusmn; SD 1.33&plusmn;0.52%, p&lt;0.001, T de Student) y DHA (10.21&plusmn;1.07%, p&lt;0.001), acompa&ntilde;ado de disminuci&oacute;n en los de AA en hemat&iacute;es (15.02&plusmn;1.44%, p&lt;0.001) y de IL-13 (9.61, p=0.025, IC 95%; 5.46-16.93) versus grupo placebo (AA 17.45&plusmn;1.17% e IL-13 26.32 IC 95%; 13.44-51.55) en plasma sangu&iacute;neo de cord&oacute;n umbilical de sus reci&eacute;n nacidos. Incluso, reportan que los niveles de DHA se asociaron inversamente con los de IL-13 en plasma de cord&oacute;n (p=0.04) (63). Estos resultados indican que la suplementaci&oacute;n dietaria con &Omega;3 totales en altas dosis durante la gestaci&oacute;n incrementar&iacute;a la biodisponibilidad de los &Omega;3 precursores en el neonato y, con ello, modular&iacute;a el nivel de s&iacute;ntesis de citoquinas TH2.</p>     <p>Adem&aacute;s, un estudio aleatorizado-controlado por Dunstan <I>et al. </I>(64) mostr&oacute; que la suplementaci&oacute;n con aceite de pescado rico en &Omega;3, desde la semana 20 de gestaci&oacute;n hasta el parto, result&oacute; tener un mayor contenido de &Omega;3 (Media &plusmn; SD 17.75 &plusmn;1.85%) y menores de &Omega;6 (25.21&plusmn;1.82%) en membranas de eritrocitos de cord&oacute;n umbilical de sus neonatos versus controles (&Omega;3 13.69&plusmn;1.22%, &Omega;6 29.50&plusmn;1.35%, p&lt; 0.001, t test), as&iacute; como menor respuesta in vitro de IL-10 a alergenos del gato (-0.543, p=0.046, IC 95%; -1.076 a -0.010, Regresi&oacute;n Lineal) en c&eacute;lulas mononucleares de cord&oacute;n. A&uacute;n m&aacute;s, los niveles de AA fueron positivamente correlacionados con la magnitud de las respuestas del INF-&gamma; contra OVA (p=0.038), contra Gato (p=0.040) y contra PHA (p=0.048), mientras que EPA fue negativamente asociado con respuestas de INF-&gamma; a PHA (p=0.011). Eventos relacionados con menor severidad de la dermatitis at&oacute;pica durante el primer a&ntilde;o de vida de la progenie (OR 0.09, p=0.045, IC 95%; 0.01-0.94, Regresi&oacute;n Log&iacute;stica) (64).</p>     <p>An&aacute;logamente, Reichardt <I>et al.</I> (65) detectaron niveles m&aacute;s elevados de &Omega;6 totales (p&lt;0.01, U de Mann-Whitney), LA (p&lt;0.05), y relaci&oacute;n LA:ALA (p&lt;0.05) y &Omega;6:&Omega;3 totales (p&lt;0.05) en el calostro de gestantes at&oacute;picas versus no at&oacute;picas, exhibiendo asociaci&oacute;n directa entre el incremento de &Omega;6 totales y LA en calostro, con los niveles s&eacute;ricos de IgE espec&iacute;ficos contra la prote&iacute;na de leche de vaca en ni&ntilde;os al a&ntilde;o de edad (p&lt;0.05). Adem&aacute;s, en el calostro de gestantes at&oacute;picas se detectaron menores niveles de &Omega;3 totales y DPA &Omega;3, asociados con niveles altos de IgE total (p&lt;0.05) en infantes a la misma edad. Lo cual se&ntilde;ala que la composici&oacute;n de PUFAs en el calostro de gestantes at&oacute;picas modifica el riesgo de sensibilizaci&oacute;n en infantes al a&ntilde;o de edad (65).</p>     <p>Lo anterior correlaciona con reportes de Lumia <I>et al.</I> (66) al detectar en ni&ntilde;os fineses al&eacute;rgicos a la leche de vaca, elevados niveles s&eacute;ricos de LA asociados con incrementado riesgo de desarrollar asma (OR 1.23, p=0.02, IC 95%; 1.04-1.44, Regresi&oacute;n Log&iacute;stica) y asma at&oacute;pico al primer y quinto a&ntilde;o de edad (OR 1.43, p=0.01, IC 95%; 1.08-1.89). A su vez, elevados niveles s&eacute;ricos de &Omega;6 totales se relacionaron con riesgo de asma no at&oacute;pico (OR 1.23, p=0.03, IC 95%; 1.02-1.48), mientras que niveles elevados de EPA en suero se relacionaron con bajo riesgo de asma no at&oacute;pico (OR 0.66, p=0.02, IC 95%; 0.47-0.92). Tomados en su conjunto, estos y otros hallazgos confirman que el aporte dietario de &Omega;6 totales durante la lactancia materna y ni&ntilde;ez temprana, influyen en el riesgo de sensibilizaci&oacute;n frente a la leche de vaca y subsecuentemente a desarrollo de asma at&oacute;pico en la infancia.</p>     <p>En soporte de ello, un estudio prospectivo en poblaci&oacute;n sueca por Duch&eacute;n <I>et al.</I> (67) muestra que a pesar de similar r&eacute;gimen dietario, la leche de gestantes at&oacute;picas y de madres de ni&ntilde;os at&oacute;picos conten&iacute;an menores niveles de EPA y DHA al primer mes (p=0.057) y menos EPA, DPA y DHA al tercer mes frente a madres de ni&ntilde;os no at&oacute;picos (EPA 0.06&plusmn;0.03 w % vs. 0.08&plusmn;0.06 w % p=0.05, DPA 0.12&plusmn;0.04 w % vs. 0.15&plusmn;0.08 w %, p&lt;0.05, DHA 0.20&plusmn;0.08 w % vs. 0.25&plusmn;0.02 w %, p=0.05, T de Student). Incluso, la elevada relaci&oacute;n AA:EPA en leche y suero de lactantes at&oacute;picas se asoci&oacute; con incremento en los niveles de AA, DPA &Omega;6 y relaci&oacute;n AA:EPA en el suero de sus hijos at&oacute;picos a los tres meses de edad, a su vez correlacionando con el desarrollo de enfermedades al&eacute;rgicas a la edad de 1.5 a&ntilde;os en su progenie (67). Hallazgos indicando que un desequilibrio en la ingesta dietaria de &Omega;6 y &Omega;3 en maternas durante la lactancia o que un metabolismo diferente ocurre entre maternas at&oacute;picas y no at&oacute;picas, que logra modificar el aporte de estas grasas al neonato y con ello, el riesgo de alergias en la infancia.</p>     <p>Similarmente, Johansson<I> et al.</I> (68) describieron que gestantes suecas que padecen de eccema at&oacute;pico (EA) y/o alergias respiratorias (AR), a pesar de consumir con alta frecuencia carne de pescado con &Omega;3, exhibieron reducidos niveles de EPA, DHA, DPA y AA, as&iacute; como baja relaci&oacute;n &Omega;3:&Omega;6 en leche materna y suero, acompa&ntilde;ado de mayor relaci&oacute;n AA:EPA en leche al primer mes post-parto (EA+AR; EPA 0.10%&plusmn;0.01 SD, DHA 0.24%&plusmn;0.03 SD, DPA 0.16%&plusmn;0.01 SD y AA 0.37%&plusmn;0.02 SD todos p&lt;0.05, AA:EPA 3.8%&plusmn;0.20 SD, n.s. AR; EPA 0.15%&plusmn;0.02 SD, DHA 0.34%&plusmn;0.04 SD y AA 0.45%&plusmn;0.02 SD todos p&lt;0.05, DPA 0.19%&plusmn;0.01 SD p&lt;0.06 y AA:EPA 3.2%&plusmn;0.34 SD p&lt;0.07. U de Mann-Whitney), comparadas a gestantes &uacute;nicamente afectadas por alergias respiratorias o saludables, y quienes adem&aacute;s consum&iacute;an con menor frecuencia pescado. Lo que indica que reducidos niveles de &Omega;3 totales y &Omega;6 espec&iacute;ficos a nivel sist&eacute;mico caracterizan a gestantes at&oacute;picas independientemente de su nivel de ingesta de pescado (68), apoyando la concepci&oacute;n de que son las diferencias inter-individuales de tipo gen&eacute;tico las que demarcan el metabolismo diferencial de estas grasas entre at&oacute;picos y no at&oacute;picos.</p>     <p>En otro estudio, Weiss <I>et al.</I> (69) observaron que la leche de gestantes at&oacute;picas &mdash;durante el primer mes postparto&mdash; conten&iacute;a una proporci&oacute;n constante de &Omega;6:&Omega;3 totales y niveles estables de LTB4, LXA4, RvE1, RvD1 y 18-HEPE (un precursor de la RvE1), acompa&ntilde;ado de disminuci&oacute;n de AA y DHA y de un incremento progresivo en sus metabolitos hidroxi, e.g., 12 y 15-HETE y 17-HDHA respectivamente. Se&ntilde;alando, que durante el periodo de lactancia, la gl&aacute;ndula mamaria de maternas at&oacute;picas presenta una elevada utilizaci&oacute;n de precursores &Omega;6 y &Omega;3 dietarios, probablemente para mantener constantes los niveles de mediadores lip&iacute;dicos pro-inflamatorios, anti y pro-resolutores de la inflamaci&oacute;n, contribuyendo a la adecuada maduraci&oacute;n y regulaci&oacute;n inmune del tracto gastrointestinal y de otros tejidos en el reci&eacute;n nacido. Lo cual plantea que un desequilibrio en la ingesta dietaria y un metabolismo diferencial de estos l&iacute;pidos en gestantes at&oacute;picas condicionar&iacute;a en el infante el desarrollo de atopia y s&iacute;ntomas al&eacute;rgicos.</p>     <p>As&iacute; mismo, un estudio de cohorte prospectivo por Lowe<I> et al.</I> (70) revel&oacute; que gestantes australianas con historia familiar de atopia, exhiben niveles m&aacute;s bajos de ambas series de l&iacute;pidos en calostro que en leche madura, confirmando en esta &uacute;ltima la presencia de niveles elevados de &Omega;6 y bajos de &Omega;3, excepto para el &Omega;3 DPA en ambas muestras, el cual se asoci&oacute; al desarrollo de eccema at&oacute;pico en infantes (OR 2.01, IC 95%; 1.17-3.45, p=0.012, Regresi&oacute;n Log&iacute;stica), principalmente de g&eacute;nero femenino (OR 3.00, IC 95%;  1.57&ndash;5.72, p=0.011) a la edad de 2 a&ntilde;os. A&uacute;n m&aacute;s, los altos niveles de &Omega;6 totales, a expensas de LA y dihomo-&gamma;-linolenato (DGLA) encontrados en calostro, correlacionaron positivamente con el riesgo de sufrir rinitis al&eacute;rgica en infantes a los 6 y 7 a&ntilde;os de edad (&Omega;6 totales Media 15.14&plusmn;4.89 SD, OR 1.59, IC 95%; 1.12&ndash;2.25, p=0.009) (70). Dichos hallazgos indican la existencia de una relaci&oacute;n entre el periodo de introducci&oacute;n dietaria de &Omega;3 y &Omega;6 y el riesgo de padecer enfermedades al&eacute;rgicas en la infancia, donde resalta la asociaci&oacute;n entre la ingesta de un &Omega;3 espec&iacute;fico y riesgo sexo espec&iacute;fico de padecer eccema at&oacute;pico en la infancia.</p>     <p>De otro lado, Laitinen <I>et al.</I> (71) en un estudio de cohorte prospectivo en poblaci&oacute;n finesa, reportaron correlaci&oacute;n positiva entre niveles s&eacute;ricos de CD14 (&rho;=0.48, p=0.003, correlaci&oacute;n de Spearman) y de PGE2 (&rho;=0.60, p&lt;0.001) con los detectados en suero de sus infantes, y adicionalmente una correlaci&oacute;n inversa entre PGE2 del suero materno con DHA (&rho;=-0.44, p=0.03) y PUFA totales (&rho;= -0.43, p=0.04) en el suero de infantes con eccema at&oacute;pico al a&ntilde;o de edad. Inclusive, el suero de estos &uacute;ltimos mostr&oacute; asociaci&oacute;n positiva entre niveles elevados de CD14 con AA y asociaci&oacute;n inversa entre CD14 y LA. Estos datos sugieren la existencia de un evento de transferencia pasiva de CD14 de madre a hijo durante la lactancia, que favorecer&iacute;a el transporte de fosfol&iacute;pidos, mayor liberaci&oacute;n de precursores PUFA y s&iacute;ntesis de eicosanoides pro-inflamatorios en el reci&eacute;n nacido y, con ello, la mayor producci&oacute;n de IgE e incremento del riesgo de sensibilizaci&oacute;n y de eccema at&oacute;pico en la infancia.</p>     ]]></body>
<body><![CDATA[<p>Otro nivel de evidencia, aportado por Per Nafstad <I>et al.</I> (72) muestra que el consumo de pescado durante el primer a&ntilde;o de vida reduce significativamente el riesgo de padecer rinitis al&eacute;rgica a la edad de 4 a&ntilde;os (OR 0.40, IC 95%; 0.25-0.63, p=0.025, Regresi&oacute;n Log&iacute;stica), no as&iacute; en ni&ntilde;os que consumieron pescado en etapas vitales posteriores (OR 1.09, IC 95%; 0.63-1.88, p=0.065). Empero, el riesgo de asma (OR 0.56, IC 95%; p=0.042) y de rinitis al&eacute;rgica (OR 0.28, IC 95%; 0.15-0.52, p=0.017) increment&oacute; en ni&ntilde;os amamantados por m&aacute;s de seis meses y quienes consumieron pescado durante su primer a&ntilde;o de vida, comparado con una menor duraci&oacute;n de la lactancia materna.</p>     <p>Adicionalmente, Alm <I>et al. </I>(73) muestran en un estudio longitudinal en poblaci&oacute;n sueca que la introducci&oacute;n de pescado independiente de su g&eacute;nero y especie en la dieta antes de los 9 meses de edad protege contra la sensibilizaci&oacute;n a alergenos inhalados (OR 31.22, IC 95%; 21.49-45.34, p&lt;0.001, An&aacute;lisis Multivariado) y de alimentos (OR 6.69, IC 95%; 4.67-9.57, p&lt;0.001) y que asimismo, reduce el riesgo de desarrollar rinitis al&eacute;rgica en ni&ntilde;os a la edad de 4.5 a&ntilde;os (OR 0.49, IC 95%; 0.29-0.82, p=0.007) (73). Resultados que sustentan la hip&oacute;tesis de que el consumir pescado durante los primeros a&ntilde;os de vida conducir&iacute;a a un balance en la relaci&oacute;n &Omega;3:&Omega;6, incrementando a su vez la producci&oacute;n de mediadores pro-resoluci&oacute;n de la inflamaci&oacute;n especializados (MPE) y reduciendo el riesgo de padecer enfermedades al&eacute;rgicas en etapas vitales posteriores.</p>     <p>De forma similar, Farchi<I> et al.</I> (74) reportaron asociaci&oacute;n positiva entre el consumir mantequilla (rica en saturados) al menos una vez por semana como aceite de cocina con riesgo de sibilancias (OR 2.19, IC 95%; 0.90-5.30, p=0.031, Regresi&oacute;n Log&iacute;stica) y el consumir mantequillas contenidas en salsas con s&iacute;ntomas de rinitis al&eacute;rgica (OR 2.36, IC 95%; 1.05-5.30, p=0.047), as&iacute; como el consumir pan con margarinas (ricas en &Omega;6) 1 a 2 veces por semana con riesgo de sibilancias a la edad de 6 y 7 a&ntilde;os (OR 2.52, IC 95%; 1.25-5.09, p=0.024) (74).</p>     <p>Adem&aacute;s, Miyake <I>et al.</I> (75) en un estudio transversal en poblaci&oacute;n japonesa, describen que el consumo de PUFA totales, &Omega;6 totales, &Omega;3 totales, ALA, LA y AA se asociaron positivamente con prevalencia de eccema at&oacute;pico en infantes y adolescentes (PUFA totales OR 1.26 IC 95%; 1.07-1.48 Ptrend=0.04, &Omega;3 totales OR 1.31 IC 95%; 1.11-1.54 Ptrend=0.009, &Omega;6 totales OR 1.26 IC 95%; 1.07-1.48 Ptrend=0.01, LA OR 1.27 IC 95%; 1.08-1.49, Ptrend=0.01, ALA OR 1.31 IC 95%; 1.12-1.55, Ptrend=0.003), mientras que un elevado consumo de AA se asoci&oacute; inversamente con prevalencia de eccema at&oacute;pico (OR 0.81 IC 95%; 0.69-0.95 Ptrend=0.0008) y rinoconjuntivitis al&eacute;rgica (ORadj 0.86, IC 95%; 0.74-0.997, Ptrend=0.03) entre los 6 y 15 a&ntilde;os de edad.</p>     <p>La anterior evidencia es soportada por estudios de Bolte <I>et al.</I> (76) al observar que el consumo de margarinas se asoci&oacute; con sensibilizaci&oacute;n at&oacute;pica (ORadj 1.30, IC 95%; 1.01-1.67, p&lt;0.05, Regresi&oacute;n Log&iacute;stica) y con s&iacute;ntomas de rinitis al&eacute;rgica (ORadj 1.41, IC 95%; 1.01-1.97, p&lt;0.05) en poblaci&oacute;n infantil general, principalmente en ni&ntilde;os de g&eacute;nero masculino entre los 5 y 14 a&ntilde;os de edad (ORadj 1.76, IC 95%; 1.12-2.78, p&lt;0.05).</p>     <p>Igualmente, un estudio transversal por Tamay <I>et al.</I> (77) en poblaci&oacute;n de Turqu&iacute;a describe asociaci&oacute;n entre el consumo de aceite de oliva (p&lt;0.001), mantequilla (ORadj 1.48, IC 95%; 1.09-2.01, p=0.000, Regresi&oacute;n Log&iacute;stica), grasa animal (ORadj 1.93, IC 95%; 1.13-3.29, p=0.001) y chocolates (p=0.045) con rinitis al&eacute;rgica, mientras que el consumo de aceite de pescado (ORadj 0.50, IC 95%; 0.28-0.89, p&lt;0.001), carne de pescado y otros alimentos de mar (ORadj 1.60, IC 95%; 1.06-2.41, p&lt;0.001) durante tres o m&aacute;s veces por semana, result&oacute; ser un factor protector contra la rinitis al&eacute;rgica en la adolescencia.</p>     <p>De igual modo, Wakay <I>et al.</I> (78) detectaron asociaci&oacute;n positiva entre el consumo dietario de &Omega;6 y s&iacute;ntomas de rinoconjuntivitis al&eacute;rgica estacional en mujeres adultas de Jap&oacute;n. Descripciones que concuerdan con los resultados de Nagel et al. (79) al detectar asociaci&oacute;n entre el elevado consumo de LA y oleato con rinitis al&eacute;rgica estacional en adultos alemanes de ambos g&eacute;neros; mientras que el alto consumo de EPA se asoci&oacute; inversamente con la incidencia de la enfermedad.</p>     <p>Adem&aacute;s, Hoff <I>et al. </I>(59) reportaron que una elevada relaci&oacute;n AA:EPA increment&oacute; el riesgo de padecer rinitis al&eacute;rgica en adultos alemanes de ambos g&eacute;neros, mientras que los altos niveles de EPA y de ALA en biomarcadores, se asociaron inversamente con el riesgo de desarrollar sensibilizaci&oacute;n at&oacute;pica (EPA OR 0.52, IC 95%; 0.30-0.90, p=0.012, ALA OR 0.51 IC 95%; 0.28-0.93, p=0.014. Regresi&oacute;n Log&iacute;stica) y rinitis al&eacute;rgica (EPA OR 0.50, IC 95%; 0.24-1.03, ALA OR 0.43 IC 95%; 0.20-0.93, Ptrend=0.027) en individuos menores de 40 a&ntilde;os de edad. A&uacute;n m&aacute;s, Kompauer et al. (80) detectaron asociaci&oacute;n positiva entre los niveles s&eacute;ricos de AA y s&iacute;ntomas de rinitis al&eacute;rgica en adultos alemanes entre los 20 y 64 a&ntilde;os de edad.</p>     <p>De manera similar, un estudio transversal en poblaci&oacute;n alemana por Heinrich <I>et al.</I> (81) describi&oacute; asociaci&oacute;n positiva entre el elevado consumo de margarinas con fiebre del heno (OR 3.04, IC 95%; 0.95-9.73, p=0.03, Regresi&oacute;n Log&iacute;stica M&uacute;ltiple) y de aceites vegetales con riesgo de sensibilizaci&oacute;n en hombres (OR 0.65, IC 95%; 0.36-1.16, p=0.04). Adem&aacute;s, la ingesta de grasas saturadas totales (SFA), monoinsaturados totales (MUFA), oleato (OL) y palmitoleato (PL), as&iacute; como la relaci&oacute;n PUFA:SFA totales, se asociaron directamente con sensibilizaci&oacute;n en mujeres adultas (SFA OR 1.99 IC 95%; 0.89-4.46 p=0.03, MUFA OR 2.13 IC 95%; 0.98-4.62 p=0.02, OL OR 2.47 IC 95%; 1.13-5.41, p=0.03, PL OR 3.04 IC 95%; 1.26-7.30, p=0.02, PUFA:SFA totales OR 0.39 IC 95%; 0.18-0.85, p=0.01) (81).</p>     <p>Incluso, el alto consumo de grasas totales (GT), MUFA y oleato se asociaron con fiebre del heno en mujeres adultas (GT OR 4.51 IC 95%; 1.38-14.75 p=0.05, MUFA OR 3.04 IC 95%; 1.07-8.59 p=0.01, OL OR 4.99 IC 95%; 1.53-16.32 p=0.01, Regresi&oacute;n Log&iacute;stica M&uacute;ltiple). Adicionalmente, el alto consumo de ALA (OR 0.47, IC 95%; 0.22-0.98, p=0.04) y la elevada relaci&oacute;n LA:ALA y &Omega;6:&Omega;3 (LA:ALA OR 1.95 IC 95%; 0.96-3.98 p=0.03, &Omega;6:&Omega;3 OR 2.02 IC 95%; 0.98-4.15, p=0.04), se asociaron en forma negativa y positiva respectivamente con eccema at&oacute;pico en mujeres (81).</p>     ]]></body>
<body><![CDATA[<p>Finalmente, un an&aacute;lisis de Rocklin <I>et al.</I> (82) indica que individuos con rinitis y asma al&eacute;rgicos e historia familiar de atopia, exhiben una eficiente incorporaci&oacute;n, biodisponibilidad celular y sist&eacute;mica, y elevada utilizaci&oacute;n metab&oacute;lica de los &Omega;6 AA y LA en linfocitos, pero a su vez, presentan defectos ya sea en el transporte, la incorporaci&oacute;n, biodisponibilidad y/o utilizaci&oacute;n metab&oacute;lica de precursores &Omega;6 en monocitos, un evento no observado en individuos no at&oacute;picos. Esto se traducir&iacute;a en un factor de riesgo para el desarrollo de sensibilizaci&oacute;n, s&iacute;ntomas y mayor severidad de las enfermedades al&eacute;rgicas en individuos at&oacute;picos, posiblemente relacionados con defectos en la desaturaci&oacute;n y/o elongaci&oacute;n de precursores &Omega;6 en c&eacute;lulas del linaje mieloide y/o con una mayor actividad funcional de las desaturasas y elongasas en linfocitos de individuos at&oacute;picos (82).</p>     <p><B><font size="3">Discusi&oacute;n y conclusiones</font></b></p>      <p>Estudios epidemiol&oacute;gicos indican que la elevada ingesta dietaria de &aacute;cidos grasos &Omega;6 totales y espec&iacute;ficos, en cualquier etapa vital, se asocian con el desarrollo, la severidad y el incremento de la prevalencia del asma at&oacute;pico y la rinitis al&eacute;rgica en distintos grupos et&aacute;reos y poblacionales, sustentado la hip&oacute;tesis de las grasas. Un evento que a su vez se traduce en un importante factor de riesgo en individuos con historia familiar de atopia.</p>     <p>Sin embargo, se ha descrito que la ingesta dietaria y/o suplementaci&oacute;n con &aacute;cidos grasos &Omega;6 totales y espec&iacute;ficos &mdash;en altas dosis y durante tiempo prolongado&mdash; ha mostrado prevenir y atenuar el desarrollo y severidad de la dermatitis at&oacute;pica en el adulto, mientras que su introducci&oacute;n durante la gestaci&oacute;n e infancia temprana, se relacionan con incrementado riesgo de padecer eccema at&oacute;pico en la infancia y adultez. Por lo cual, se requieren investigaciones encaminadas a definir el periodo de ventana nutricional &oacute;ptimo para la introducci&oacute;n oportuna de los &Omega;6, a fin de prevenir eficazmente los s&iacute;ntomas asociados a sensibilizaci&oacute;n y el desarrollo de alergias.</p>     <p>Por su parte, estudios epidemiol&oacute;gicos se&ntilde;alan que la ingesta frecuente y en altas dosis de los &aacute;cidos grasos &Omega;3 totales y espec&iacute;ficos, contenidos en la carne y el aceite de pescado durante cualquier etapa vital, muestran ser &uacute;tiles en prevenir y reducir significativamente los s&iacute;ntomas asociados a sensibilizaci&oacute;n at&oacute;pica y la severidad cl&iacute;nica de las enfermedades al&eacute;rgicas, i.e.: asma, rinitis y dermatitis, en distintos grupos et&aacute;reos y poblacionales. No obstante, resta por definir si la suplementaci&oacute;n con los &Omega;3 contenidos en el aceite y la carne de pescado, as&iacute; como en otros alimentos, pudiera ser viable como esquema de tratamiento y/o como terapia adyuvante a fin de prevenir, atenuar o resolver la inflamaci&oacute;n durante las reacciones al&eacute;rgicas in vivo en el humano.</p>     <p>Los efectos ben&eacute;ficos de consumir &aacute;cidos grasos &Omega;3 totales y espec&iacute;ficos en la dieta sobre las alergias son verificados a nivel experimental, principalmente en modelos murinos de asma al&eacute;rgico y dermatitis at&oacute;pica, al demostrar m&uacute;ltiples y potentes efectos directos de los precursores &Omega;3 dietarios sobre el estado inflamatorio, e indirectos, mediados por la generaci&oacute;n in vivo y modos de acci&oacute;n de sus metabolitos pro-resoluci&oacute;n de la inflamaci&oacute;n especializados (MPE), actuando a nivel celular y molecular sobre los &oacute;rganos blanco de la respuesta inmune de tipo al&eacute;rgico (31).</p>     <p>Se describe adem&aacute;s, que la mayor&iacute;a de los &Omega;3 y algunos de los &Omega;6 dietarios, as&iacute; como varios de sus metabolitos derivados representan un enorme potencial inmunomodulador en la prevenci&oacute;n y tratamiento farmacol&oacute;gico de los trastornos inmunitarios al&eacute;rgicos. No obstante, a&uacute;n se requieren estudios experimentales que diluciden la interrelaci&oacute;n temporal y las dosis efectivas de estos mediadores de contra-regulaci&oacute;n inflamatoria, durante las reacciones al&eacute;rgicas in vivo, conducentes a comprender y definir el tiempo espec&iacute;fico de intervenciones terap&eacute;uticas eficaces.</p>     <p>Adicional a lo anterior, se aprecia el hecho que sujetos at&oacute;picos metabolizan de manera distinta los PUFA dietarios a favor de una mayor s&iacute;ntesis de eicosanoides pro-inflamatorios derivados de los &Omega;6 linoleato y araquidonato (83, 84) y que, paralelo a ello, presentan defectos en la generaci&oacute;n de mediadores de contra-regulaci&oacute;n inflamatoria derivados de los &Omega;3 (85) e incluso de los &Omega;6 (86), con lo cual, se da una mayor severidad cl&iacute;nica en los primeros, no as&iacute; en sujetos no at&oacute;picos.</p>     <p>Se piensa que este metabolismo diferencial de los PUFA &Omega;3 y &Omega;6 entre at&oacute;picos y no at&oacute;picos, estar&iacute;a determinado por diferencias inter-individuales de tipo gen&eacute;tico y/o epigen&eacute;tico, que a su vez, ser&iacute;an responsables de los resultados aparentemente contradictorios de algunos estudios epidemiol&oacute;gicos referidos a esta tem&aacute;tica. Lo que plantea como necesidad apremiante, el investigar y correlacionar c&oacute;mo influyen este tipo de diferencias en la mayor o menor tasa metab&oacute;lica de estos l&iacute;pidos y entender de manera integral, c&oacute;mo impacta esta interrelaci&oacute;n el inicio, desarrollo, severidad y prevalencia de las enfermedades al&eacute;rgicas.</p>     <p>Es necesario anotar que no se encontr&oacute; evidencia experimental que sustente los efectos ben&eacute;ficos de los &Omega;3 y de sus metabolitos en la rinoconjuntivitis al&eacute;rgica y que brinden validez adicional a la hip&oacute;tesis de las grasas. Tampoco se encontraron estudios experimentales que demuestren los efectos pro-alerg&eacute;nicos directos del &Omega;6 araquidonato o de sus precursores a nivel de la patofisiolog&iacute;a celular o molecular. Entonces, a nuestro entender los efectos pro-alerg&eacute;nicos asociados a estos &uacute;ltimos, depender&aacute;n de la generaci&oacute;n y modos de acci&oacute;n in vivo de sus eicosanoides derivados.</p>     ]]></body>
<body><![CDATA[<p>Finalmente, los estudios epidemiol&oacute;gicos describen una relaci&oacute;n poco clara entre los niveles de ingesta dietaria y en biomarcadores de los &aacute;cidos grasos monoinsaturados, saturados y de cadena corta, y su papel en las patolog&iacute;as al&eacute;rgicas. Adem&aacute;s, se apreci&oacute; que existen pocos estudios experimentales que eval&uacute;en los efectos de estas grasas dietarias en c&eacute;lulas y &oacute;rganos blanco de la respuesta al&eacute;rgica y mucho menos durante las reacciones al&eacute;rgicas in vivo. A pesar de ello, los hallazgos existentes a la fecha, a nivel celular y molecular, sugieren que estos l&iacute;pidos propiciar&iacute;an el desarrollo de reacciones al&eacute;rgicas. T&oacute;picos que requerir&aacute;n un mayor y mejor abordaje experimental por parte de inmun&oacute;logos y alerg&oacute;logos, a fin de esclarecer sus mecanismos subyacentes.</p>     <p><B>Conflicto de intereses</b></p>     <p>Ninguno declarado por los autores.</p>     <p><B>Financiaci&oacute;n </b></p>     <p>Universidad de Cartagena.</p>     <p><B>Agradecimientos</b></p>     <p>Ninguno declarado por los autores.</p> <hr>     <p><B><font size="3">Referencias</font></b></p>     <!-- ref --><p>1. Pawankar R, Canonica GW, Holgate ST, Lockey RF. WAO-White Book on Allergy: World Allergy Organization &#91;Internet&#93;; 2011-2012 &#91;cited 2015 may 12&#93;. Available from: <a href="http://goo.gl/CkOZOB" target="_blank">http://goo.gl/CkOZOB</a>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000091&pid=S0120-0011201500020001500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     ]]></body>
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