<?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>1870-0462</journal-id>
<journal-title><![CDATA[Tropical and subtropical agroecosystems]]></journal-title>
<abbrev-journal-title><![CDATA[Trop. subtrop. agroecosyt]]></abbrev-journal-title>
<issn>1870-0462</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Yucatán, Facultad de Medicina Veterinaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-04622011000300002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Quimiotaxis bacteriana y flavonoides: perspectivas para el uso de probióticos]]></article-title>
<article-title xml:lang="en"><![CDATA[Bacterial chemotaxis and flavonoids: prospects for the use of probiotics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galicia-Jiménez]]></surname>
<given-names><![CDATA[Mónica Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval-Castro]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Herrera]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magaña-Sevilla]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Mar Instituto de Genética Campus Puerto Escondido]]></institution>
<addr-line><![CDATA[Juquila Oax.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Ingeniería Química Campus de Ingenierías y Ciencias Exactas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto Tecnológico de Conkal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>14</volume>
<numero>3</numero>
<fpage>891</fpage>
<lpage>900</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-04622011000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-04622011000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-04622011000300002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La aplicación de diversas dietas se han enfocado en buscar mayor producción en los rumiantes variando el alimento del animal, afectando así la población microbiana ruminal, sin embargo, la eficacia en la producción del rumiante ha sido reportada de manera inconsistente. Por otro lado, se han realizado estudios de metabolites secundarios secretados por plantas y se ha visto que tienen una función de atrayente o repelente en la interacción planta-microorganismo. Por lo que nuestro objetivo es integrar el conocimiento de interacción bacterias ruminales-partículas del forraje usado como alimento y los flavonoides como estimulantes en el movimiento flagelar. De este modo, comprender las vías de señalización utilizadas por las bacterias del rumen para la colonización de las partículas de alimentos y la degradación del mismo. E implementar programas de investigación usando herramientas genómicas que nos ayuden a descubrir genes quimiotacticos en bacterias ruminales que contribuyan en dilucidar principios que rigen la comunicación de las poblaciones microbianas, sus principales interacciones y productos del metabolismo microbiano, y así se podrían plantear la manipulación de la fermentación ruminal, creando los cultivos probióticos para el ganado vacuno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The application of different diets have focused on seeking greater production in the ruminant animal feed varies, thus affecting rumen microbial population, however, the production efficiency of ruminants has been reported inconsistently. Furthermore, studies have been conducted secondary metabolites secreted by plants and has been having a function of attractant or repellent in plant-microbe interactions. So our goal is to integrate knowledge of rumen bacteria-particle interactions of forage used for food and flavonoids as stimulants in the flagellar movement. Thus, understanding the signaling pathways used by rumen bacteria to colonize food particles and degradation. Research and implement programs using genomic tools to help us discover chemotactic genes in rumen bacteria that contribute to elucidate principles governing the communication of microbial populations, their interactions and main products of microbial metabolism, and thus could raise the handling of ruminal fermentation, creating the probiotic cultures for cattle.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Quimiotaxis]]></kwd>
<kwd lng="es"><![CDATA[Flavonoides]]></kwd>
<kwd lng="es"><![CDATA[Rumen]]></kwd>
<kwd lng="es"><![CDATA[Bacterias]]></kwd>
<kwd lng="es"><![CDATA[Probióticos]]></kwd>
<kwd lng="en"><![CDATA[Chemotaxis]]></kwd>
<kwd lng="en"><![CDATA[Flavonoids]]></kwd>
<kwd lng="en"><![CDATA[Rumen]]></kwd>
<kwd lng="en"><![CDATA[Bacteria]]></kwd>
<kwd lng="en"><![CDATA[Probiotics]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Revisi&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Quimiotaxis bacteriana y flavonoides: perspectivas para el uso de probi&oacute;ticos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Bacterial chemotaxis and flavonoids: prospects for the use of probiotics</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>M&oacute;nica Marcela Galicia&#45;Jim&eacute;nez*<sup>1</sup>, Carlos Sandoval&#45;Castro<sup>2</sup>, Rafael Rojas&#45;Herrera<sup>3</sup>, H&eacute;ctor Maga&ntilde;a&#45;Sevilla<sup>4</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Instituto de Gen&eacute;tica. Universidad del Mar. Campus Puerto Escondido. Ciudad Universitaria, Carretera V&iacute;a Sola de Vega, Puerto Escondido, San Pedro Mixtepec, Juquila, Oax., M&eacute;xico C.P. 71980.</i> E&#45;mail: <a href="mailto:monicagalicia@zicatela.umar.mx">monicagalicia@zicatela.umar.mx</a></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Facultad de Medicina Veterinaria y Zootecnia. Universidad Aut&oacute;noma de Yucat&aacute;n.Carretera aXmatkuil Km. 15.5 Apartado Postal n&uacute;m. 116 CP 97315</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Facultad de Ingenier&iacute;a Qu&iacute;mica, Campus de Ingenier&iacute;as y Ciencias Exactas, Universidad Aut&oacute;noma de Yucat&aacute;n Perif&eacute;rico Norte Kil&oacute;metro 33.5, Tablaje Catastral 13615, Col. Chuburna de Hidalgo Inn, C.P. 97203.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Instituto Tecnol&oacute;gico de Conkal. Km. 16.3 Antigua Carretera M&eacute;rida&#45;Motul. C.P. 97345</i></font></p>  	    <p align="justify"><font face="verdana" size="2">* Corresponding author</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Submitted March 22, 2011    <br> 	Accepted May 30, 2011    <br> 	Revised received July 04, 2011</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La aplicaci&oacute;n de diversas dietas se han enfocado en buscar mayor producci&oacute;n en los rumiantes variando el alimento del animal, afectando as&iacute; la poblaci&oacute;n microbiana ruminal, sin embargo, la eficacia en la producci&oacute;n del rumiante ha sido reportada de manera inconsistente. Por otro lado, se han realizado estudios de metabolites secundarios secretados por plantas y se ha visto que tienen una funci&oacute;n de atrayente o repelente en la interacci&oacute;n planta&#45;microorganismo. Por lo que nuestro objetivo es integrar el conocimiento de interacci&oacute;n bacterias ruminales&#45;part&iacute;culas del forraje usado como alimento y los flavonoides como estimulantes en el movimiento flagelar. De este modo, comprender las v&iacute;as de se&ntilde;alizaci&oacute;n utilizadas por las bacterias del rumen para la colonizaci&oacute;n de las part&iacute;culas de alimentos y la degradaci&oacute;n del mismo. E implementar programas de investigaci&oacute;n usando herramientas gen&oacute;micas que nos ayuden a descubrir genes quimiotacticos en bacterias ruminales que contribuyan en dilucidar principios que rigen la comunicaci&oacute;n de las poblaciones microbianas, sus principales interacciones y productos del metabolismo microbiano, y as&iacute; se podr&iacute;an plantear la manipulaci&oacute;n de la fermentaci&oacute;n ruminal, creando los cultivos probi&oacute;ticos para el ganado vacuno.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Quimiotaxis; Flavonoides; Rumen; Bacterias; Probi&oacute;ticos.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The application of different diets have focused on seeking greater production in the ruminant animal feed varies, thus affecting rumen microbial population, however, the production efficiency of ruminants has been reported inconsistently. Furthermore, studies have been conducted secondary metabolites secreted by plants and has been having a function of attractant or repellent in plant&#45;microbe interactions. So our goal is to integrate knowledge of rumen bacteria&#45;particle interactions of forage used for food and flavonoids as stimulants in the flagellar movement. Thus, understanding the signaling pathways used by rumen bacteria to colonize food particles and degradation. Research and implement programs using genomic tools to help us discover chemotactic genes in rumen bacteria that contribute to elucidate principles governing the communication of microbial populations, their interactions and main products of microbial metabolism, and thus could raise the handling of ruminal fermentation, creating the probiotic cultures for cattle.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Chemotaxis; Flavonoids; Rumen; Bacteria; Probiotics.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las bacterias son capaces de comunicarse entre ellas y con otros organismos por est&iacute;mulos, los cuales, son liberados al ambiente y las c&eacute;lulas bacterianas cercanas a la inducci&oacute;n lo traducen e informan a otras c&eacute;lulas bacterianas como respuesta a &eacute;l. Por medio de estas mol&eacute;culas se&ntilde;al las bacterias son capaces de regular su propia densidad poblacional y coordinar la expresi&oacute;n de genes en la comunidad bacteriana. Sin embargo, las pr&aacute;cticas modernas en la alimentaci&oacute;n del animal no consideran este di&aacute;logo molecular que se lleva a cabo entre las bacterias y el ambiente ruminal y se han enfocado en buscar mayor producci&oacute;n en los rumiantes variando la dieta del animal, afectando la poblaci&oacute;n microbiana ruminal (Brulce/a/.,2009).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Estrategias nutricionales para modificar la fermentaci&oacute;n ruminal</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El contenido bioqu&iacute;mico en plantas son parte de la dieta del rumiante y estos componentes bioactivos (polifenoles, fitoestrogenos, glicoalcaloides) son interesantes en la nutrici&oacute;n ruminal (Varel <i>et al,</i> 1991; Hammes y Hertel 2002). Numerosos estudios hacen pensar la posibilidad de utilizarlos como aditivos de alimento naturales para proveer la eficiencia en la fermentaci&oacute;n ruminal, aumentando la producci&oacute;n de prote&iacute;nas y disminuyendo la producci&oacute;n de metano (Wang <i>et al,</i> 2000; Muetzel <i>et al,</i> 2003, Parra <i>et al,</i> 2006). Zhou <i>et al,.</i> (2010) realiz&oacute; un estudio donde observ&oacute; una diferencia en la comunidad metanog&eacute;nica ruminal cuando la dieta se cambi&oacute; de una dieta baja en energ&iacute;a a una dieta de alta energ&iacute;a. Otros estudios mostraron que extractos de plantas o metabolitos secundarios (saponinas, taninos y aceites esenciales) modifican la poblaci&oacute;n ruminal. (Goel <i>et al,</i> 2008) mostr&oacute; un incremento de la poblaci&oacute;n de <i>Ruminococcus flavefaciens</i> y <i>Fibrobacter succinogenes</i> al utilizar un suplemento con extractos de <i>Carduus pycnocephalus, Sesbania sesban, Knautia arvensis</i> and semillas de fenogreco <i>(Trigonella foenum&#45;graecum</i> L.). As&iacute; mismo, Muetzel <i>et al,.</i> (2003) al utilizar hojas de <i>S. pachycarpa in vitro</i> observaron un incremento en <i>R. flavefaciens.</i> Wang <i>et al,.</i> (2000) tambi&eacute;n observ&oacute; un incremento de la densidad poblacional de <i>F. succinogenes</i> al utilizar suplementos con saponinas de yucca mostraron que el acido fenilpropanoico estimula el crecimiento de <i>Ruminococcus albus</i> 8. Duval <i>et al,</i> (2007) observ&oacute; que la colonizaci&oacute;n se vio afectada significativamente por el sustrato sustratos ricos en almid&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Estudios recientes han utilizado herramientas moleculares para investigar los perfiles de las bacterias como es el caso de Klieve <i>et al,</i> (2007) al identificar bacterias dominantes en cebada siendo <i>Ruminococcus bromii</i> la predominante. O Tajima <i>et al,</i> (2001) utiliz&oacute; PCR tiempo real para observar la din&aacute;mica de <i>F. succinogenes</i> y <i>R. flavefaciens</i> al variar la dieta de los rumiantes, observando que la cantidad de ADN de <i>F. succinogenes,</i> se redujo 20 veces en el tercer d&iacute;a del cambio a una dieta de granos y se redujo a&uacute;n m&aacute;s el d&iacute;a 28, en relaci&oacute;n con la concentraci&oacute;n de ADN de <i>R. flavefaciens</i> en el d&iacute;a 3 se redujo a aproximadamente el 10% de su valor inicial en los animales en la dieta de heno y se mantuvo en este nivel hasta el d&iacute;a 28.</font></p>  	    <p align="justify"><font face="verdana" size="2">Krause <i>et al,</i> (2004) utiliz&oacute; microarreglos de los genomas de la comunidades bacterianas para evaluar los efectos de <i>Acacia angustissima</i> el rumen. Las dietas que utilizaron fueron: (1) dieta basal 50% pasto Rhodes, m&aacute;s el 50% de arfar&iacute;a por un per&iacute;odo de 30 d&iacute;as, (2) paso a paso la adaptaci&oacute;n (13 d&iacute;as) para <i>A. angustissima</i> mediante la sustituci&oacute;n de 50 g por d&iacute;a de la alfalfa por <i>Acacia</i> hasta el 37% (RLA), (3) RLA m&aacute;s de 60 g por d&iacute;a de polietilenglicol (PEG;, mol masa 4000) (RLAP) durante 10 d&iacute;as, y (4) de vuelta a la dieta basal de 50% de pasto Rhodes, m&aacute;s el 50% de arfar&iacute;a durante 10 d&iacute;as. En el caso de Northern blot se observ&oacute; un aumento en la abundancia de <i>Ruminococcus albus, R. flavefaciens</i> y <i>Fibrobacter succinogenes,</i> cuando <i>Acacia</i> fue a&ntilde;adida a la dieta (4.3 a 9.5% para ambos <i>Ruminococcus</i> y 1.7 a 5.6% para <i>Fibrobacter)</i> y hubo pocos cambios en estas dos poblaciones cuando PEG fue agregado a la dieta. A diferencia de los microarreglos mostraron una disminuci&oacute;n significativa (P &lt;0.05) de <i>Ruminococcus,</i> pero no en <i>Fibrobacter,</i> cuando PEG fue agregado a la dieta.</font></p>  	    <p align="justify"><font face="verdana" size="2">Fernando <i>et al,</i> (2010) evalu&oacute; la din&aacute;mica de la poblaci&oacute;n bacteriana durante la adaptaci&oacute;n a una dieta alta en grano, conteniendo granos y heno en proporciones de 20:80, 40:60, 60:40 y 80:20. Los animales alimentados con heno conten&iacute;an un n&uacute;mero mayor de bacterias que pertenecen al phylum de Fibrobacteres, mientras los animales alimentados con granos conten&iacute;an un n&uacute;mero mayor de bacterias que pertenecen al phylum Bacteroidetes. Ya en el an&aacute;lisis de PCR tiempo real detectaron aumentos significativos en <i>Megasphaera elsdenii, Streptococcus bovis, Selenomonas ruminantium</i> y <i>Prevotella bryantii</i> durante la adaptaci&oacute;n de la dieta de alto concentrado de grano, mientras que el <i>Butyrivibrio fibrisolvens</i> y <i>Fibrobacter succinogenes</i> disminuy&oacute; gradualmente.</font></p>  	    <p align="justify"><font face="verdana" size="2">Hernandez&#45;Sanabria <i>et al,</i> (2010) al investigar la interacci&oacute;n entre la microflora ruminal y el hu&eacute;sped mediante la correlaci&oacute;n de diversidad bacteriana con las mediciones de fermentaci&oacute;n y los rasgos de la eficiencia alimenticia, incluyendo el consumo de materia seca, alimento tasa de conversi&oacute;n, ganancia diaria de peso, y el consumo de alimento residual. Los resultados sugieren que las bacterias y su metabolismo en el rumen pueden contribuir a las diferencias en la eficiencia de acogida de piensos bajo una dieta baja en energ&iacute;a. Por otro lado, Yang <i>et al,</i> (1999) sugiere que los compuestos isoflavonoicos pueden afectar la actividad microbiana y su metabolismo al aumentar los niveles testosterona en la sangre y en el rumen. Yao <i>et al,.</i> (2004) detectaron cambios en la composici&oacute;n de la microbiota ruminal al suplementar este flavonoide en cabras, Zhu <i>et al.,</i> (2002) tambi&eacute;n not&oacute; el efecto directos de la daidzeina en la actividad microbiana ruminal mediante t&eacute;cnicas <i>in vitro.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">China es el pa&iacute;s que se ha enfocado a este tipo de estudios y han mostrado efectos positivos de este isoflavonoide en el crecimiento animal, como es el caso de Guo <i>et al,</i> (2002) donde realiz&oacute; estudios en cerdos machos castrados, proporcion&aacute;ndoles una dieta complementado con daidzeina mostr&oacute; un aumento de peso del 59% y los niveles de IGF&#45;1 y testosterona se elevaron en un 51% y 18%, respectivamente.</font></p>  	    <p align="justify"><font face="verdana" size="2">Microorganismos intestinales desempe&ntilde;an un papel importante en el metabolismo del isoflavona en el intestino de los animales (Schoefer <i>et al,</i> 2002; Blaut <i>et al,</i> 2003, Wang <i>et al,2005;</i> Yu <i>et al,</i> 2008; Zhang <i>et al,</i> 2010) y, en consecuencia influye en el destino metab&oacute;lico de las isoflavonas. A su vez, los isoflavonoides o sus metabolitos afectan la actividad microbiana del intestino (Rafii <i>et al,</i> 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">Nosotros buscamos y cuantificamos daidzeina en 9 plantas con potencial forrajero, encontrando este flavonoide en 4 plantas (datos no publicados). As&iacute; mismo, se realiz&oacute; ensayos de quimiotaxis hac&iacute;a la daidzeina encontrando 3 especies de bacterias ruminales que fueron atra&iacute;das por este isoflavonoide (datos no publicados).</font></p>  	    <p align="justify"><font face="verdana" size="2">Claramente, las investigaciones sugieren que los isoflavonoides tienen un gran potencial para su uso en suplementos prebi&oacute;ticos en la alimentaci&oacute;n animal en el futuro. Sin embargo, la aclaraci&oacute;n del mecanismo de acci&oacute;n de la daidzeina en microorganismos requiere m&aacute;s estudios.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Flavonoides</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides son metabolitos secundarios que se encuentra en las plantas, est&aacute;n compuestos por una red de 15 carbonos, los cuales consisten de dos anillos fenil (anillo A, derivado de la cadena policet&iacute;dica, anillo B, derivado del &aacute;c. shikimico) conectado por un tercer anillo (C) correspondiente a la parte alqu&iacute;lica del fenilpropano (Winkel&#45;Shirley, 2002). Tambi&eacute;n pueden encontrarse unidos a az&uacute;cares, preferentemente a la posici&oacute;n C3 y con menor frecuencia al C7 del anillo A, de forma que estos compuestos se encuentran com&uacute;nmente como O&#45;glic&oacute;sidos, siendo la D&#45;glucosa el residuo az&uacute;car m&aacute;s frecuente. Otros residuos de az&uacute;cares son la D&#45;galactosa, la L&#45;ramnosa, la L&#45;arabinosa, la D&#45;xilosa, as&iacute; como el &aacute;cido D&#45;glucur&oacute;nico (Selma <i>et al,</i> 2009). Los flavonoides se dividen en varias clases (<a href="/img/revistas/tsa/v14n3/a2t1.jpg" target="_blank">Tabla 1</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides est&aacute;n ampliamente distribuidos en plantas vasculares y briofitas, y han sido reportados 5,000 tipos de flavonoides como constituyentes naturales, por lo que podemos encontrarlos en los forrajes (<a href="/img/revistas/tsa/v14n3/a2t2.jpg" target="_blank">Tabla 2</a>) que sirven de alimento a los rumiantes. Estos metabolites secundarios se encuentran abundantemente en las partes a&eacute;reas j&oacute;venes y m&aacute;s expuestas al sol, como son: hojas, frutos y flores, ya que la luz solar favorece su s&iacute;ntesis, responden a la luz y controlan los niveles de las auxinas reguladoras del crecimiento y diferenciaci&oacute;n de las plantas, confieren coloraci&oacute;n, lo que puede contribuir a los fen&oacute;menos de polinizaci&oacute;n y tienen una importante capacidad para fijar metales como el hierro y el cobre (Formica y Regelson, 1995).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Los flavonoides y la quimiotaxis</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s est&aacute;n implicados en interacciones directas con el transporte y la v&iacute;a de traducci&oacute;n de se&ntilde;ales, en la regulaci&oacute;n transcripcional, en la expresi&oacute;n de genes end&oacute;genos. Otra funci&oacute;n importante de los flavonoides se ha observado en la interacci&oacute;n planta&#45;microorganismo, donde ellos tienen el papel principal como mol&eacute;cula se&ntilde;al repelente o atrayente de bacterias pat&oacute;genas o ben&eacute;ficas, respectivamente (<a href="/img/revistas/tsa/v14n3/a2t3.jpg" target="_blank">Tabla 3</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Adherencia en las bacterias ruminales</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En 1993, Pell y Schofield (Citado en Mir&oacute;n <i>et al,</i> 2001) describieron en 4 fases el proceso de adhesi&oacute;n que ocurre en el rumen. Fase I el transporte de bacterias al sustrato fibroso, la adhesi&oacute;n depende de las bacterias de vida libre que se encuentran suspendidas en el fluido ruminal, del tama&ntilde;o de las part&iacute;culas del alimento, de condiciones ambientales. Fase II adhesi&oacute;n inicial no especifica, esta fase es iniciada cuando la bacteria se encuentra cerca al sustrato (2 a 5 nm) esta atracci&oacute;n se realiza por fuerza de Van der Waals, fuerzas hidrof&oacute;bicas, i&oacute;nicas e interacci&oacute;n hidrost&aacute;tica entre la bacteria y el sustrato s&oacute;lido, es una combinaci&oacute;n de procesos reversibles e irreversibles sin que se involucren alguna adhesina o ligando con el receptor de sustrato (Mir&oacute;n <i>et al,</i> 2001). Estudios como el de Morris, 1988, muestran que los primeros minutos despu&eacute;s de la digesta existe el contacto entre bacterias y sustrato s&oacute;lido, en especies de <i>Ruminococci</i> la adhesi&oacute;n ocurre dentro de 1 a 5 min despu&eacute;s de la digesta, <i>F. succinogenes</i> ocurre dentro de 15 a 30 min. (Gong y Forsberg, 1989).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Fase III adhesi&oacute;n especifica, en esta fase el proceso se lleva a cabo por el cual ligandos o adhesinas superficiales de c&eacute;lulas bacterianas reconocen al receptor del tejido del sustrato. Mir&oacute;n <i>et al,</i> (2001) muestran c&eacute;lulas de <i>F. succinogenes, R. albus,</i> y <i>R. flavefaciens</i> adheridas a pared celular de plantas formando agregados bacterianos, form&aacute;ndose varias horas despu&eacute;s de ser incubados. Estos autores sugieren que durante el inicio de la digesti&oacute;n del polisac&aacute;rido de la pared celular existen se&ntilde;ales que estimulan la adherencia bacteriana (Mir&oacute;n <i>et al,</i> 2001).</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase IV proliferaci&oacute;n y colonizaci&oacute;n a los tejidos de los sustratos forrajeros, en esta fase, como dice el nombre las bacterias adheridas al sustrato proliferan y crean colonias en sitios potencialmente digerible (Mir&oacute;n <i>et al,</i> 2001). As&iacute; mismo, Shinkai y Kobayashi (2007) utilizando la t&eacute;cnica de Hibridaci&oacute;n Fluorescente <i>in situ</i> (FISH) encontr&oacute; que <i>R. flavefaciens</i> coloniza los bordes de los hoyos formados durante la digesti&oacute;n de la vaina de la hoja, mientras que <i>F. succinogenes</i> &uacute;nicamente se encontr&oacute; presente en el tallo menos degradado. Estos hallazgos indican claramente las funciones fibrol&iacute;ticas muy potente de estas dos especies, a pesar de que cada especie tiene su propia preferencia por los tejidos vegetales en particular como un sustrato de crecimiento.</font></p>  	    <p align="justify"><font face="verdana" size="2">Si constan evidencias de la existencia de uno de los mecanismos de interacci&oacute;n (la adherencia) entre la part&iacute;cula del alimento y las bacterias ruminales celul&oacute;liticas, es muy probable que se encuentre el segundo mecanismo (la quimiotaxis) en esta comunicaci&oacute;n molecular.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Quimiotaxis bacteriana</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La quimiotaxis es un mecanismo por el cual la bacteria responde eficientemente y r&aacute;pidamente a cambios en la composici&oacute;n qu&iacute;mica en su ambiente. La quimiotaxis al igual que otras taxis (<a href="#t4">Tabla 4</a>) permite a la bacteria acercarse y permanecer en ambientes favorables y escapar de los hostiles. Este mecanismo es un movimiento activo y dirigido de la bacteria a trav&eacute;s de un gradiente qu&iacute;mico (Mowery <i>et al,</i> 2008).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t4"></a><img src="/img/revistas/tsa/v14n3/a2t4.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Bases moleculares de la quimiotaxis</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La quimiotaxis es uno de los sistemas de traducci&oacute;n de se&ntilde;ales que controlan el movimiento m&aacute;s estudiado. Y las prote&iacute;nas relacionadas en la quimiotaxis son ordenadas en cuatro grupos 1) reconocimiento y traducci&oacute;n de se&ntilde;al, 2) excitaci&oacute;n, 3) adaptaci&oacute;n, 4) supresi&oacute;n de se&ntilde;al (<a href="/img/revistas/tsa/v14n3/a2t5.jpg" target="_blank">Tabla 5</a>). Este sistema de traducci&oacute;n de se&ntilde;ales se encarga de convertir un est&iacute;mulo extracelular, ya sea ambiental o de una c&eacute;lula cercana, en una se&ntilde;al intracelular dirigida a producir una respuesta, esta respuesta puede ser acercarse o alejarse del gradiente qu&iacute;mico.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los est&iacute;mulos son detectados por receptores (prote&iacute;na quimiotactica aceptora de grupos metilos; MCPs), cuando el estimulo (ligando) se une al receptor realiza un cambio conformacional en la prote&iacute;na MCP, est&aacute; a su vez traduce la informaci&oacute;n hacia el dominio de se&ntilde;alizaci&oacute;n intracelular y autofosforila la prote&iacute;na histidinquinasa CheA, una vez fosforilada (CheA&#45;P) es sustrato del regulador de respuesta Che Y, el resultante (Che Y&#45;P) interacciona con el mecanismo del motor flagelar (FliM) que induce un cambio en la direcci&oacute;n de rotaci&oacute;n del flagelo (favor de las manecillas del reloj; paro en el nado), conforme el aumento en la concentraci&oacute;n del atrayente disminuye los niveles de Che Y&#45;P, esto se ve reflejado en el nado de la bacteria hacia la condici&oacute;n favorable (Stock <i>et al,</i> 2002; Szurmanty Ordal, 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">La quimiotaxis tambi&eacute;n se ha mostrado en los rumiantes como son el caso de como en hongos y protozoarios ruminales (<a href="/img/revistas/tsa/v14n3/a2t6.jpg" target="_blank">Tabla 6</a>), lo que es de esperar que exista en bacterias ruminales.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Bases de datos para el an&aacute;lisis de gen&oacute;mica comparativa nos permitieron dilucidar la presencia de genes quimiotacticos en <i>Ruminococcus albus</i> que pudieran ser los responsables de un conjunto diverso de funciones de se&ntilde;alizaci&oacute;n como la formaci&oacute;n de biofilm, adherencia y regulaci&oacute;n de genes (Galicia Jim&eacute;nez <i>et al.,</i> 2011) Aunado a esto <i>R. albus</i> mostr&oacute; poseer una prote&iacute;na de uni&oacute;n a celulosa (CBP) llamada CbpC, y presenta una homolog&iacute;a con el pili tipo IV de bacterias Gram negativas (Chesson <i>et al,</i> 1982; Hungate y Stack, 1982) este tipo de pilis se distingue de otros por su localizaci&oacute;n polar, secuencias conservadas de prote&iacute;nas de ensamblaje pilinas y su papel en la movilidad (Rakotoarivonina <i>et al,</i> 2005, Shinkai y Kobayashi, 2007) Que junto con el glicocalix (Rakotoarivonina <i>et al,</i> 2005) est&aacute;n involucradas en la adhesi&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Dado que el fen&oacute;meno quimiot&aacute;ctico ha sido poco estudiado en bacterias ruminales, la detecci&oacute;n de genes responsables de la quimiotaxis en estos microorganismos, provee una herramienta en la disecci&oacute;n molecular de este fen&oacute;meno en rumiantes. A partir del conocimiento de los principios que rigen la comunicaci&oacute;n de las poblaciones microbianas, sus principales interacciones y productos del metabolismo microbiano se podr&iacute;an plantear la manipulaci&oacute;n de la fermentaci&oacute;n ruminal, creando as&iacute; los cultivos probi&oacute;ticos para el ganado vacuno (Holzapfel y Schillinger, 2002), actuando ben&eacute;ficamente en la flora intestinal del individuo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Akashi, T., S. Koshimizu, T. Aoki, and S. Ayabe. 2006. Identification of cDNAs encoding pterocarpan reduc&iacute;ase involved in isoflavan phytoalexin biosynthesis in Lotus japonicus by EST mining. 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