<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282014000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biopéptidos en la leche y sus derivados: funcionamiento y beneficios a la salud]]></article-title>
<article-title xml:lang="en"><![CDATA[Bioactive peptides in milk and their derivatives: functionality and health benefits]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Hernández]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rentería-Monterrubio]]></surname>
<given-names><![CDATA[Ana Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Figueroa]]></surname>
<given-names><![CDATA[José Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Martínez]]></surname>
<given-names><![CDATA[América]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Zootecnia y Ecología ]]></institution>
<addr-line><![CDATA[Chihuahua Chih.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<volume>1</volume>
<numero>3</numero>
<fpage>281</fpage>
<lpage>294</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282014000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282014000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282014000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La leche y los productos lácteos son fuente de proteínas de alto valor biológico. Algunas de éstas presentan actividades biológicas, nutricionales y funcionales en el ser humano. En los últimos años se ha reportado que los péptidos, derivados de las proteínas lácteas, son capaces de influir positivamente en la salud del consumidor. Sin embargo, éstos no ejercen beneficio alguno, más allá del aporte nutricional, cuando forman parte de las proteínas lácteas nativas, por lo que es necesario someter a las proteínas a procesos de hidrólisis enzimática. Este proceso puede llevarse a cabo por los microorganismos propios de la leche o por aquellos que son inoculados durante la elaboración y por la adición de enzimas comerciales utilizadas durante el procesado. Cabe señalar que el efecto hidrolítico no se limita a la elaboración de los productos lácteos, sino que continúa durante la maduración y la vida en el anaquel. Así mismo, diversas investigaciones han evidenciado que la actividad de las enzimas gastrointestinales es determinante en la hidrólisis que experimentan las proteínas lácteas. De tal forma que la liberación de los péptidos, aunada al tamaño, hidrofobicidad y secuencia de los mismos constituyen requisitos indispensables para convertirlos en péptidos con actividad biológica. Éstos últimos, también considerados como péptidos bioactivos o biopéptidos, han despertado recientemente el interés de los investigadores debido a que pueden influenciar favorablemente las funciones que llevan a cabo los sistemas inmune, gastrointestinal, nervioso y cardiovascular impactando la salud del consumidor. En esta revisión de literatura, se abordaron los mecanismos por los cuales son generados los biopéptidos derivados de proteínas lácteas y los efectos fisiológicos que producen.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Milk and dairy products are sources of highly valuable biological proteins. Some of these have biological, nutritional and functional activities in humans. In recent years, it has been reported that peptides derived from milk proteins, are able to positively influence the health of consumers. However, they do not exert any benefit beyond the contribution of nutrition when they are part of the native milk proteins, so it is necessary to subject proteins to enzymatic hydrolysis. This process can be carried out by the native milk microorganisms or by those who are inoculated during processing and by the addition of commercial enzymes during processing. Note that the hydrolytic effect is not limited to the production of dairy products, but it continues during ripening and shelf life. Also, several studies have shown that the activity of gastrointestinal enzymes is determinant in undergoing hydrolysis of milk proteins. Such that the release of the peptide, coupled the size, hydrophobicity and sequence are prerequisites to become biologically active peptides. The latter, also considered as bioactive peptides or biopeptides have recently attracted the interest of researchers because they can favorably influence the functions carried out by the immune, gastrointestinal, nervous and cardiovascular systems hence impacting the health of consumers. In this review the mechanisms by which the bioactive peptides derived from milk proteins are generated and the physiological effects the produced where addresed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hidrólisis]]></kwd>
<kwd lng="es"><![CDATA[biopéptidos]]></kwd>
<kwd lng="es"><![CDATA[proteínas lácteas]]></kwd>
<kwd lng="es"><![CDATA[salud]]></kwd>
<kwd lng="en"><![CDATA[Hydrolysis]]></kwd>
<kwd lng="en"><![CDATA[bioactive peptides]]></kwd>
<kwd lng="en"><![CDATA[dairy proteins]]></kwd>
<kwd lng="en"><![CDATA[health]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>     <p align="justify">&nbsp;</p>     <p align="center"><font face="verdana" size="4"><b>Biop&eacute;ptidos en la leche y sus derivados: funcionamiento y beneficios a la salud</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Bioactive peptides in milk and their derivatives: functionality and health benefits</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Gabriela Rodr&iacute;guez&#45;Hern&aacute;ndez, Ana Luisa Renter&iacute;a&#45;Monterrubio, Jos&eacute; Carlos Rodr&iacute;guez&#45;Figueroa, *Am&eacute;rica Ch&aacute;vez&#45;Mart&iacute;nez</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Facultad de Zootecnia y Ecolog&iacute;a, Universidad Aut&oacute;noma de Chihuahua. Perif&eacute;rico Francisco R. Almada, Km 1 de la Carretera Chihuahua&#45;Cuauht&eacute;moc. Chihuahua, Chih., M&eacute;xico, 31031. Tel&eacute;fono: (614) 434&#45;0303.</i> *<a href="mailto:amchavez@uach.mx">amchavez@uach.mx</a></font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Art&iacute;culo de revisi&oacute;n recibido: 21 de julio de 2013,<b>    <br> </b>Aceptado: 22 de enero de 2014.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p> 	    <p align="justify"><font face="verdana" size="2">La leche y los productos l&aacute;cteos son fuente de prote&iacute;nas de alto valor biol&oacute;gico. Algunas de &eacute;stas presentan actividades biol&oacute;gicas, nutricionales y funcionales en el ser humano. En los &uacute;ltimos a&ntilde;os se ha reportado que los p&eacute;ptidos, derivados de las prote&iacute;nas l&aacute;cteas, son capaces de influir positivamente en la salud del consumidor. Sin embargo, &eacute;stos no ejercen beneficio alguno, m&aacute;s all&aacute; del aporte nutricional, cuando forman parte de las prote&iacute;nas l&aacute;cteas nativas, por lo que es necesario someter a las prote&iacute;nas a procesos de hidr&oacute;lisis enzim&aacute;tica. Este proceso puede llevarse a cabo por los microorganismos propios de la leche o por aquellos que son inoculados durante la elaboraci&oacute;n y por la adici&oacute;n de enzimas comerciales utilizadas durante el procesado. Cabe se&ntilde;alar que el efecto hidrol&iacute;tico no se limita a la elaboraci&oacute;n de los productos l&aacute;cteos, sino que contin&uacute;a durante la maduraci&oacute;n y la vida en el anaquel. As&iacute; mismo, diversas investigaciones han evidenciado que la actividad de las enzimas gastrointestinales es determinante en la hidr&oacute;lisis que experimentan las prote&iacute;nas l&aacute;cteas. De tal forma que la liberaci&oacute;n de los p&eacute;ptidos, aunada al tama&ntilde;o, hidrofobicidad y secuencia de los mismos constituyen requisitos indispensables para convertirlos en p&eacute;ptidos con actividad biol&oacute;gica. &Eacute;stos &uacute;ltimos, tambi&eacute;n considerados como p&eacute;ptidos bioactivos o biop&eacute;ptidos, han despertado recientemente el inter&eacute;s de los investigadores debido a que pueden influenciar favorablemente las funciones que llevan a cabo los sistemas inmune, gastrointestinal, nervioso y cardiovascular impactando la salud del consumidor. En esta revisi&oacute;n de literatura, se abordaron los mecanismos por los cuales son generados los biop&eacute;ptidos derivados de prote&iacute;nas l&aacute;cteas y los efectos fisiol&oacute;gicos que producen.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Hidr&oacute;lisis, biop&eacute;ptidos, prote&iacute;nas l&aacute;cteas, salud.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Milk and dairy products are sources of highly valuable biological proteins. Some of these have biological, nutritional and functional activities in humans. In recent years, it has been reported that peptides derived from milk proteins, are able to positively influence the health of consumers. However, they do not exert any benefit beyond the contribution of nutrition when they are part of the native milk proteins, so it is necessary to subject proteins to enzymatic hydrolysis. This process can be carried out by the native milk microorganisms or by those who are inoculated during processing and by the addition of commercial enzymes during processing. Note that the hydrolytic effect is not limited to the production of dairy products, but it continues during ripening and shelf life. Also, several studies have shown that the activity of gastrointestinal enzymes is determinant in undergoing hydrolysis of milk proteins. Such that the release of the peptide, coupled the size, hydrophobicity and sequence are prerequisites to become biologically active peptides. The latter, also considered as bioactive peptides or biopeptides have recently attracted the interest of researchers because they can favorably influence the functions carried out by the immune, gastrointestinal, nervous and cardiovascular systems hence impacting the health of consumers. In this review the mechanisms by which the bioactive peptides derived from milk proteins are generated and the physiological effects the produced where addresed.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Key words:</b> Hydrolysis, bioactive peptides, dairy proteins, health.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La leche y sus derivados son considerados una fuente importante de nutrientes ya que adem&aacute;s de suministrar energ&iacute;a, contienen prote&iacute;nas de alta calidad, minerales y vitaminas (Park 2009). La leche de vaca contiene alrededor de 3.5 % de prote&iacute;nas, de las cuales el 80 % son case&iacute;nas (<i>&#945;, &#946;, &#947;</i> y <i>&#954;</i>) y el <i>resto</i> son prote&iacute;nas del suero (<i>&#946;&#45;</i>lactoglobulina, &#945;&#45;lactalbumina, seroalb&uacute;mina y prote&iacute;nas minoritarias) (Jauhiainen y Korpela 2007, Fox y McSweeney 2008). Las prote&iacute;nas son macromol&eacute;culas mismas que se definen como componentes estructurales celulares esenciales, debido a las numerosas funciones que desempe&ntilde;an en el organismo (Vioque <i>et al.</i> 2000; Fox y McSweeney 2008). La hidr&oacute;lisis de &eacute;stos componentes tiene como consecuencia la generaci&oacute;n de p&eacute;ptidos, mismos que adem&aacute;s de cumplir con su funci&oacute;n nutricional, como cualquier otra prote&iacute;na, son capaces de ejercer efectos biol&oacute;gicos ben&eacute;ficos espec&iacute;ficos, por lo que se les denominan p&eacute;ptidos bioactivos o biop&eacute;ptidos (Kumar y Bhalla 2005, Costa <i>et al.</i> 2007, Dziuba <i>et al.</i> 2009). A la fecha se han aislado diversos biop&eacute;ptidos de diferentes alimentos tales como: huevo, pescado, pollo, soya, leche (Miguel <i>et al.</i> 2007) y mariscos (Kim y Wijesekara 2010, Nazeer y Srividhya 2011). Sin embargo, las prote&iacute;nas de la leche son consideradas una de las principales fuentes de p&eacute;ptidos bioactivos (Minervini <i>et al.</i> 2009, Sanlidere y Oner 2011, Plainsanci&eacute; <i>et al.</i> 2012) que presentan efectos positivos sobre la salud del consumidor (Foltz <i>et al.</i> 2007, Miguel <i>et al.</i> 2007, Hajirostamloo 2010). Por lo anterior, el objetivo de este trabajo fue analizar la formaci&oacute;n, funcionamiento y los beneficios a la salud que presentan los p&eacute;ptidos bioactivos derivados de las prote&iacute;nas de la leche. El m&eacute;todo empleado para conducir la recopilaci&oacute;n de art&iacute;culos necesarios para alcanzar el objetivo planteado, se realiz&oacute; a trav&eacute;s del motor de b&uacute;squeda de Science Direct, con las palabras de b&uacute;squeda: bioactive peptides, and milk bioactive peptides, descarg&aacute;ndose los archivos correspondientes en formato pdf. Por lo que en una b&uacute;squeda realizada del a&ntilde;o 2012 a 2013 se encontraron 286 art&iacute;culos, mismos de los cuales se descargaron 127, consider&aacute;ndose importantes o relacionados con el presente 83 art&iacute;culos publicados entre 1996 y 2013.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Formaci&oacute;n de biop&eacute;ptidos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Como se mencion&oacute; anteriormente los biop&eacute;ptidos, son fragmentos de prote&iacute;nas que no presentan actividad biol&oacute;gica cuando se encuentran formando parte de una prote&iacute;na, sin embargo, cuando esta se hidroliza, los p&eacute;ptidos se separan y comienzan a ejercer su funci&oacute;n bioactiva (Foltz <i>et al.</i> 2007, Weimann <i>et al.</i> 2009, Kim y Wijesekara 2010). La bioactividad de los p&eacute;ptidos depende de la secuencia y n&uacute;mero de amino&aacute;cidos que lo integran, &eacute;stos pueden contener entre 2 y 20 amino&aacute;cidos (Korhonen y Philanto 2006), mismos que se generan por hidr&oacute;lisis enzim&aacute;tica, la cual puede llevarse a cabo de tres formas: a) con enzimas digestivas, b) por microorganismos proteol&iacute;ticos y c) con enzimas proteol&iacute;ticas derivadas de microorganismos o plantas (Madureira <i>et al.</i> 2010, Pritchard <i>et al.</i> 2010). Por su importancia tecnol&oacute;gica con frecuencia sobresalen dos m&eacute;todos de hidr&oacute;lisis; mediante el uso de enzimas digestivas y por medio de fermentaci&oacute;n microbiana, en el entendido de que las enzimas proteol&iacute;ticas aisladas para hidrolizar las prote&iacute;nas son producidas por microorganismos principalmente como bacterias u hongos y plantas (Kumar y Bhalla 2005, Korhonen 2009, Ru&iacute;z&#45;Gim&eacute;nez <i>et al.</i> 2012). Adicionalmente a estas rutas, tambi&eacute;n se liberan biop&eacute;ptidos por la acci&oacute;n de enzimas end&oacute;genas presentes en la leche, tales como la plasmina y la catepsina (Bouhallab y Bougl&eacute; 2004, Ong y Shah 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Los biop&eacute;ptidos se pueden producir por diferentes mecanismos que son:</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Hidr&oacute;lisis por enzimas digestivas.</b> Las principales enzimas gastrointestinales que producen biop&eacute;ptidos son: pepsina, tripsina, quimiotripsina, enzima convertidora de angiotensina (ECA), pancreatina y las combinaciones de &eacute;stas con otras enzimas bacterianas (Korhonen 2009, Wang <i>et al.</i> 2010, Choi <i>et al.</i> 2011).</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Fermentaci&oacute;n  	  microbiana.</b> La fermentaci&oacute;n de la leche se da principalmente por  	  la acci&oacute;n de microorganismos que forman parte de los cultivos involucrados  	  en la manufactura de los productos l&aacute;cteos, particularmente las bacterias      &aacute;cido l&aacute;cticas (BAL) (Korhonen 2009, Gonz&aacute;lez&#45;Gonz&aacute;lez      <i>et al.</i> 2011). De estos microorganismos, los m&aacute;s estudiados son      <i>Lactococcus</i> spp. y <i>Lactobacillus</i> spp. (Ebringer <i>et al.</i>      2008), ya que sintetizan enzimas proteol&iacute;ticas intracelulares como proteasas  	  y peptidasas capaces de liberar biop&eacute;ptidos (Donkor <i>et al.</i> 2007,  	  Ebringer <i>et al.</i> 2008, Gonz&aacute;lez&#45;Gonz&aacute;lez <i>et al.</i>      2011). Por otra parte, para inducir la s&iacute;ntesis <i>in vitro</i> de algunos  	  biop&eacute;ptidos, son usados hongos peptidoliticos, como <i>Aspergillus oryzae</i>      (Engberink <i>et al.</i> 2008, Van der Zander <i>et al.,</i> 2008) y <i>Saccharomyces  	    cerevisae</i> (Ong y Shah 2008). Inclusive se han usado algas unicelulares para  	  la producci&oacute;n sint&eacute;tica de biop&eacute;ptidos, como es en el caso  	  de Campos&#45;Quevedo <i>et al.</i> (2013), que emplearon a <i>Chlamydomonas  	    reinhardatii</i> y a partir de prote&iacute;nas l&aacute;cteas, sintetizaron    &eacute;ptidos con actividad antihipertensiva, opioide, antimicrobiana e hipocolesterol&eacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Biop&eacute;ptidos presentes en productos l&aacute;cteos</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A la fecha se han aislado una gran variedad de biop&eacute;ptidos de la leche y productos l&aacute;cteos tales como: suero (Ijas <i>et al.</i> 2004, Wang <i>et al.</i> 2010), leches fermentadas con BAL (Ferreira y Eca 2007, Park 2008, Minervini <i>et al.</i> 2009, Nielsen <i>et al.</i> 2009), yogurt (Donkor <i>et al.</i> 2007, Papadimitriou <i>et al.</i> 2007, Paul y Somkuti 2009, Sanlidere y Oner 2011) y quesos tales como cheddar (Haileselassie <i>et al.</i> 1999) y manchego (G&oacute;mez&#45;Ru&iacute;z <i>et al.</i> 2004). Mismos que a medida que aumenta su periodo de maduraci&oacute;n, incrementan la cantidad de p&eacute;ptidos producidos (Korhonen y Pihlanto 2006, Ong y Shah 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Funciones biol&oacute;gicas de los biop&eacute;ptidos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los biop&eacute;ptidos pueden impactar positivamente en la salud del consumidor por medio del sistema inmune, gastrointestinal, nervioso, cardiovascular y al estado nutricional (Dziuba y Darewicz 2007, Jauhianen y Korpela 2007, Hajirostamloo 2010, Ru&iacute;z&#45;Gim&eacute;nez <i>et al.</i> 2012).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Efecto de los biop&eacute;ptidos sobre el sistema gastrointestinal</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las prote&iacute;nas y p&eacute;ptidos derivados de la leche influencian la regulaci&oacute;n de enzimas digestivas y la absorci&oacute;n de nutrientes en el tracto intestinal (Schanbacher <i>et al.</i> 1997, Caroli <i>et al.</i> 2011). Bouhallab y Bougl&eacute; (2004), Mart&iacute;nez y Mart&iacute;nez (2006) y Caroli <i>et al.</i> (2011) mencionan que algunos caseinofosfop&eacute;ptidos, que son p&eacute;ptidos fosforilados obtenidos de las case&iacute;nas, pueden enlazar cationes como zinc, calcio o fierro haci&eacute;ndolos m&aacute;s estables en diferentes condiciones fisicoqu&iacute;micas, lo que facilita su absorci&oacute;n intestinal. En un estudio en particular, se observ&oacute; que el concentrado de p&eacute;ptidos de prote&iacute;na l&aacute;ctea causaba apoptosis (muerte celular programada) de las c&eacute;lulas cancerosas (HT&#45;29) presentes en el colon (Kreider <i>et al.</i> 2011). Por otra parte, en ratas, se ha demostrado que la administraci&oacute;n oral de la fracci&oacute;n 94&#45;123 de la &#946;&#45;case&iacute;na puede mantener y restaurar la homeostasis intestinal debido al efecto que tiene en la expresi&oacute;n de los genes MUC2 y MUC4, los cuales codifican para la s&iacute;ntesis de c&eacute;lulas (HT29&#45;MTX) de la mucina en el intestino delgado (Plaisanci&eacute; <i>et al.</i> 2013). Un beneficio adicional que presentan los p&eacute;ptidos bioactivos derivados de los fragmentos de las K&#45;case&iacute;nas y las lactoferrinas, consiste en la estimulaci&oacute;n del crecimiento de bacterias probi&oacute;ticas en el tracto gastrointestinal, tales como bifidobacterias (Park 2009). Otro beneficio, es la actividad antimicrobiana que muestran contra organismos pat&oacute;genos tales como <i>Staphylococcus</i> spp., <i>Sarcina</i> spp., <i>Bacillus</i> spp., <i>Diplococcus</i> spp., <i>Streptococcus</i> spp., <i>Candida albicans, Escherichia coli,</i> y algunos otros Gram positivos, Gram negativos y dermatofitos (Clare y Swaisgood 2000, Benkerroum 2010, Hern&aacute;ndez&#45;Ledesma <i>et al.</i> 2011). Se ha demostrado que la lactoferricina (LFcina) que es un p&eacute;ptido correspondiente al extremo amino&#45;terminal de la lactoferrina, tiene una actividad bactericida m&aacute;s potente que la de la propia lactoferrina (Mart&iacute;nez y Mart&iacute;nez 2006). La LFcina inhibe numerosos pat&oacute;genos, de los cuales: virus (Dziuba y Darewicz 2007), como los virus del herpes simplex tipo 1 y 2 (Chatterton <i>et al.</i> 2006); bacterias tales como <i>Bacillus</i> spp., <i>E.coli</i> 0111 (Clare y Swaisgood 2000), <i>Helicobacter pylori,</i> y <i>Listeria monocytogenes</i> (Park 2009); y hongos como <i>Candida albicans</i> (Clare y Swaisgood 2000). Por otra parte, la isracidina, que es un p&eacute;ptido de 23 residuos de la fracci&oacute;n N &#45; terminal de las &#945;s1&#45; case&iacute;nas tiene actividad antimicrobiana contra pat&oacute;genos como <i>Staphylococcus aureus, Streptococcus pyogenes y L. monocytogenes</i> (Benkerroum 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Efectos de los biop&eacute;ptidos en el sistema cardiovascular</b></font></p>  	     <p align="justify"><font face="verdana" size="2">Diversos estudios han reportado        biop&eacute;ptidos con actividad antioxidante, antihipertensiva, antitromb&oacute;tica        y reguladora de los niveles de colesterol (Ong y Shah 2008) (<a href="/img/revistas/era/v1n3/a8t1.jpg" target="_blank">Tabla        1</a>). En relaci&oacute;n a la actividad antihipertensiva, la ECA (Peptidil      ]]></body>
<body><![CDATA[  dip&eacute;ptido hidrolasa &#45; EC 3.4.15.1), es un dip&eacute;ptido liberador        de una exopeptidasa asociada a la regulaci&oacute;n de la presi&oacute;n arterial,        ya que participa en la conversi&oacute;n de angiotensina&#45;l en angiotensina&#45;II        (Seppo <i>et al.</i> 2003, Foltz <i>et al.</i> 2007, Ahn <i>et al.</i> 2009)        algunos biop&eacute;ptidos pueden inhibir la acci&oacute;n de esta enzima, logrando        un efecto antihipertensivo que a su vez beneficia el sistema inmune y nervioso        del consumidor ya que favorece el estado de homeostasis (Miguel <i>et al.</i>        2007, Minervini <i>et al.</i> 2009, Otte <i>et al.</i> 2011). As&iacute; mismo,        los hidrolizados de origen l&aacute;cteo producidos con tripsina han demostrado        una relevante actividad inhibitoria de la ECA (Pripp, 2005) principalmente los      ]]></body>
<body><![CDATA[  p&eacute;ptidos cuyo tama&ntilde;o es menor de 3 kDa (Alvarado y Guerra 2010,        Ru&iacute;z&#45;Gim&eacute;nez <i>et al.</i> 2012). Por otra parte, las caracter&iacute;sticas        de los p&eacute;ptidos antihipertensivos son el hecho de que presentan residuos        hidr&oacute;fobos como Trp, Tyr o Phe en una de las tres &uacute;ltimas posiciones        de su secuencia; en donde tal estructura pept&iacute;dica al unirse a los sitios        activos de la ECA bloquean la actividad de &eacute;sta (Shahidi y Zhong 2008).        Dicho bloqueo incrementa tambi&eacute;n al aumentar la cantidad de cargas positivas,        a partir de la presencia de residuos de Lys o Arg en posiciones terminales del        p&eacute;ptido (Shahidi y Zhong 2008, Alvarado y Guerra 2010). Por otra parte,        residuos de Pro solos o en combinaci&oacute;n con residuos hidr&oacute;fobos,      ]]></body>
<body><![CDATA[  tienen actividad inhibitoria de la ECA (Alvarado y Guerra 2010). Tal es el caso        de los trip&eacute;ptidos Val&#45;Pro&#45;Pro e lle&#45;Pro&#45;Pro, los cuales        se ha demostrado que presentan actividad inhibitoria de la ECA (Aihara <i>et        al.</i> 2005, Hozer y Kirmaci 2009, Jauhiainen <i>et al.</i> 2010, Udenigwe        y Aluko 2012) ya que disminuyen significativamente la presi&oacute;n arterial        de personas hipertensas (Van Mierlo <i>et al.</i> 2009). As&iacute; mismo, al        aislar dichos p&eacute;ptidos de leches agrias y administrarlos a ratas hipertensas,        se inhibi&oacute; la actividad de la ECA (Sipola <i>et al.</i> 2001). Por otro        lado Jakala, <i>et al.</i> (2009), al monitorear en ratas el tr&aacute;nsito        del p&eacute;ptido radiomarcado lle&#45;Pro&#45;Pro, por el sistema digestivo      ]]></body>
<body><![CDATA[  hasta su adsorci&oacute;n, concluyeron que el enlace Pro&#45;Pro es resistente        a las enzimas proteol&iacute;ticas presentes en el aparato digestivo y por lo        tanto, este trip&eacute;ptido puede llegar a sangre y a otros &oacute;rganos        para desempe&ntilde;ar la actividad ECA inhibitoria, ellos probaron los p&eacute;ptidos        Val&#45;Pro&#45;Pro e lle&#45;Pro&#45;Pro en ratas hipertensas, observando una        funci&oacute;n protectora del endotelio de las arterias, mientras que Jauhiainen        <i>et al.</i> (2007) mencionan que presentan actividad antihipertensiva. El        mismo efecto se ha encontrado al suministrar este biop&eacute;ptido en personas        hipertensas (Jauhiainen <i>et al.</i> 2010). Otros p&eacute;ptidos que han presentado        actividad de la ECA son: el dip&eacute;ptido Tyr&#45;Pro, aislado de las prote&iacute;nas      ]]></body>
<body><![CDATA[  del suero (Korhonen Philanto 2006) y p&eacute;ptidos provenientes de las <i>&#946;</i>&#45;lactoglobulinas        como: Leu&#45;Ala&#45;Met&#45;Ala y Val&#45;Phe&#45;Lys (Kamau <i>et al.</i>        2010b). Los fragmentos Trp&#45;Leu&#45;Ala&#45;His&#45;Lys (Kamau <i>et al.</i>        2010a, FitzGerald <i>et al.</i> 2011) y Tyr&#45;Gly&#45;Leu de las <i>&#945;</i>&#45;lactoalb&uacute;minas        tambi&eacute;n han mostrado actividad inhibitoria de la ECA (Kamau <i>et al.</i>        2010a). Por otra parte, Ru&iacute;z&#45;Gim&eacute;nez <i>et al.</i> (2012)        aislaron 11 p&eacute;ptidos provenientes de la lactoferrina, los cuales ejercieron        actividad inhibitoria a la ECA. As&iacute; mismo, se ha comprobado que el consumo        de prote&iacute;na hidrolizada de suero ejerce una reducci&oacute;n significativa        de la presi&oacute;n sangu&iacute;nea en personas hipertensas (FitzGerald <i>et      ]]></body>
<body><![CDATA[  al.</i> 2004, Mart&iacute;nez y Mart&iacute;nez 2006). Algunos otros p&eacute;ptidos        que <i>in</i> <i>vitro</i> han mostrado acci&oacute;n inhibitoria de la actividad        de la ECA incluyen Leu&#45;Pro&#45;Pro, Ala&#45;Trp, lle&#45;Trp, Leu&#45;Trp,        Val&#45;Tyr, lle&#45;Tyr y Phe&#45;Tyr, los cuales fueron aislados de yogurt        (Foltz <i>et al.</i> 2007). Tsai <i>et al.</i> (2008) inocularon leche con <i>Lactobacillus        bulgaricus y Streptococcus thermophilus,</i> y al separar el suero de la misma,        observaron que la capacidad inhibitoria de la ECA se concentraba en el suero,        misma que se atribuy&oacute; a la secuencia Tyr&#45;Pro&#45;Tyr&#45;Tyr, posteriormente,        al administrar el suero a ratas hipertensas observaron disminuciones significativas        en la presi&oacute;n sist&oacute;lica y diast&oacute;lica. Nielsen <i>et al.</i>      ]]></body>
<body><![CDATA[  (2009) analizaron leches fermentadas con cepas espec&iacute;ficas de <i>Lactoccocus        lactis, Lactobacillus helveticus, Lactobacillus acidophilus y Streptococcus        thermophilus</i> observando que estas leches presentaban un efecto inhibitorio        sobre la ECA. Por otro lado, se encontr&oacute; que leche fermentada con cepas        nativas de <i>Lactococcus lactis</i> aisladas de diversos ecosistemas pod&iacute;an        biogenerar fracciones pept&iacute;dicas con actividad antihipertensiva (Rodr&iacute;guez&#45;Figueroa        <i>et al.</i> 2010), mientras que S&aacute;nchez <i>et al.</i> (2011), al administrar        case&iacute;na bovina hidrolizada a ratas hipertensas durante seis semanas,        observaron una reducci&oacute;n de la presi&oacute;n arterial sist&oacute;lica        y diast&oacute;lica. En un estudio realizado <i>in vivo</i> se demostr&oacute;      ]]></body>
<body><![CDATA[  que algunos biop&eacute;ptidos son producidos en arterias y venas, tal es el        caso de; <i>&#945;</i>&#45;salusin, <i>&#946;</i>&#45;salusin y apelina 36,        las cuales funcionan como vasodilatadores contribuyendo a la homeostasis cardiopulmonar        (Aydin <i>et al.</i> 2012). Por otra parte, se ha sugerido que existen biop&eacute;ptidos        de origen l&aacute;cteo que influyen sobre la regulaci&oacute;n del colesterol        s&eacute;rico (Turpeinen <i>et al.</i> 2009), tal es el caso de la lactostatina        (derivada de la <i>&#946;</i>&#45;lactoglobulina), que administrada oralmente        disminuy&oacute; significativamente los niveles de colesterol s&eacute;rico        total en animales modelos (Ricci&#45;Cabello <i>et al.</i> 2012). Sin embargo,        no se conoce con certeza c&oacute;mo act&uacute;an estos p&eacute;ptidos, se      ]]></body>
<body><![CDATA[  cree que el efecto que ejercen los p&eacute;ptidos hipocolesterol&eacute;micos        se debe a que disminuyen la solubilidad micelar del colesterol, es decir, reducen        su absorci&oacute;n intestinal, as&iacute; como la inducci&oacute;n de la transcripci&oacute;n        gen&eacute;tica de la enzima colesterol&#45;7&#45;hidroxilasa (responsable de        metabolizar el colesterol) (Ricci&#45;Cabello <i>et al.</i> 2012). Sin embargo,        se requiere mayor cantidad de estudios en personas hipercolesterol&eacute;micas        para evaluar los efectos totales as&iacute; como los mecanismos de acci&oacute;n        de dichos p&eacute;ptidos (Undenigwe y Aluko 2012).</font></p>     	    <p align="justify"><font face="verdana" size="2">La actividad antitromb&oacute;tica est&aacute; tambi&eacute;n relacionada con la regulaci&oacute;n del sistema cardiovascular, de hecho, se ha reportado que tanto las prote&iacute;nas del suero como algunas case&iacute;nas liberan biop&eacute;ptidos que inhiben enlaces del fibrin&oacute;geno y trombina (inhibiendo la formaci&oacute;n de trombos) as&iacute; como tambi&eacute;n inhiben el factor dependiente de inhibici&oacute;n plaquetaria (Claire y Swaisgood 2000; Jauniainen y Korpela 2007). Los principales p&eacute;ptidos antitromb&oacute;ticos son llamados casoplatelinas, y algunos de ellos son las fracciones de la <i>K</i>&#45;case&iacute;na de 112&#45;116, 113&#45;116, 106&#45;112 y 106&#45;116 (Vioque <i>et al.,</i> 2000); as&iacute; como fragmentos de otras prote&iacute;nas l&aacute;cteas, tal es el caso del p&eacute;ptido Lys&#45;Arg&#45;Asp&#45;Ser&#45;Glu&#45;Arg&#45;Lys&#45;Arg&#45;Asp&#45;Ser, proveniente de la lactoferrina (Mart&iacute;nez y Mart&iacute;nez 2006). Otra aportaci&oacute;n de los biop&eacute;ptidos en el sistema cardiovascular, es la acci&oacute;n antioxidante al eliminar radicales libres y quelar o inhibir especies reactivas de ox&iacute;geno (Kamau <i>et al.</i> 2010a, Nazeer y Srividhya 2011, Samaranayaka y Li&#45;Chan 2011), retardando as&iacute; el envejecimiento celular y el progreso de enfermedades cr&oacute;nicas (Chanput, Nakai y Theerakulkait, 2010). Los amino&aacute;cidos hidr&oacute;fobos son cruciales para llevar a cabo la actividad antioxidante, al reconocer las c&eacute;lulas blanco y enlazarse a &aacute;cidos grasos poliinsaturados de las membranas celulares (Udenigwe y Aluko 2012), entre estos destacan los p&eacute;ptidos formados de 5 a 11 amino&aacute;cidos, que contienen: lle, Leu, Phe, Trp, Tyr y Val (Chanput <i>et al.</i> 2010, Kamau <i>et al.</i> 2010b); as&iacute; como, Trp o Tyr en la posici&oacute;n del C&#45;terminal del p&eacute;ptido (Shahidi y Zhong 2008). De igual forma, los anillos arom&aacute;ticos de los amino&aacute;cidos como Phe, Tyr y Trp, pueden contribuir a quelar iones met&aacute;licos pro&#45;oxidantes (Samaranayaka y Li&#45;Chan 2011, Udenigwe y Aluko 2012); por ejemplo, las secuencias: Tyr&#45;His&#45;Tyr, Leu&#45;His&#45;Trp y Leu&#45;His&#45;Gly (Chanput <i>et al.</i> 2010); los fragmentos: 15&#45;20, 19&#45;29, 12&#45;46, 25&#45;40, 78&#45;83, 92&#45;100 y 145&#45;149 de las <i>&#946;</i>&#45;lactoglobulinas; las fracciones 1&#45;15, 17&#45;31, 109&#45;114 de las <i>&#945;</i>&#45;lactalbuminas, la secuencia de 17&#45; 41 de las lactoferrinas, (Kamau <i>et al.</i> 2010b) y el p&eacute;ptido Ala&#45;Arg&#45;His&#45;Pro&#45;His&#45;Pro&#45;His&#45;Leu&#45;Ser&#45;Phe&#45;Met, aislado de la <i>&#954;</i>&#45;case&iacute;na presentan actividad antioxidante (Sanlidere y Oner 2011). Abad&iacute;a&#45;Garc&iacute;a <i>et al.</i> (2013), a partir de extractos de queso cottage elaborado con diferentes probi&oacute;ticos, encontraron que todos ellos ejerc&iacute;an actividad antioxidante, la cual aumentaba durante el periodo de maduraci&oacute;n. Finalmente, Contreras <i>et al.</i> (2013) sometieron diferentes p&eacute;ptidos aislados de case&iacute;nas <i>&#945;</i>s1 (Arg&#45;Tyr&#45;Lys&#45;Gly&#45;Tyr, Ala&#45;Tyr&#45;Phe&#45;Thy&#45;Pro&#45;Glu&#45;Leu y Tyr&#45;GIn&#45;Lys&#45;Phe&#45;Pro&#45;GIn&#45;Tyr) a una hidr&oacute;lisis parcial con enzimas digestivas, observando que estos conservaban su actividad antioxidante.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Biop&eacute;ptidos en la regulaci&oacute;n del sistema nervioso</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En 1975 se aislaron por primera vez p&eacute;ptidos endog&eacute;nos con actividad opioide, los cu&aacute;les proven&iacute;an de hidrolizados de prote&iacute;nas l&aacute;cteas (Vioque <i>et al.</i> 2000) y desde entonces se han identificado diversos biop&eacute;ptidos que son liberados de las prote&iacute;nas de la leche que presentan esta actividad (Sing y Sachan 2011). Los receptores opioides est&aacute;n localizados en los sistemas endocrino, inmune y nervioso, y son agentes que se unen a receptores del dolor o neurotransmisores. Algunas mol&eacute;culas opioides pueden actuar relajando m&uacute;sculos lisos, favoreciendo as&iacute; el transporte de electrolitos (Korhonen y Philanto 2006) o inhibiendo neurotransmisores como los relacionados con el dolor y la hipotensi&oacute;n (Madureira <i>et al.</i> 2010). Espec&iacute;ficamente algunos p&eacute;ptidos con actividad opiode pueden actuar uni&eacute;ndose a receptores, como moduladores ex&oacute;genos de la motilidad intestinal, de la permeabilidad epitelial o por medio de la liberaci&oacute;n de hormonas intestinales (Mart&iacute;nez y Mart&iacute;nez 2006). La caracter&iacute;stica com&uacute;n de los p&eacute;ptidos que presentan actividad opioide, es el hecho de que presentan un residuo de Tyr en el extremo N&#45;terminal conjuntamente con otro residuo arom&aacute;tico ya sea de Phe o Tyr en la tercera o cuarta posici&oacute;n de la secuencia de amino&aacute;cidos (Vioque <i>et al.</i> 2000, Shahidi y Zhong 2008, Haque <i>et al.</i> 2009, Alvarado y Guerra 2010). Los p&eacute;ptidos m&aacute;s reconocidos que tienen esta funci&oacute;n son los fragmentos de la <i>&#946;</i>&#45;case&iacute;na llamados <i>&#946;</i>&#45;casomorfinas, los cuales ofrecen un efecto similar a la morfina y han sido estudiados tanto <i>in vitro</i> como <i>in vivo</i> (Haileselassie <i>et al.</i> 1999, Ebringer <i>et al.</i> 2008). Algunas casomorfinas son capaces de estimular la absorci&oacute;n intestinal de agua y electrolitos, y de esta manera reducir la motilidad intestinal, funcionando como termorreguladores o suprimiendo la secreci&oacute;n g&aacute;strica (Ebringer <i>et al.</i> 2008). Otros p&eacute;ptidos estudiados que muestran actividad opioide son: los fragmentos de lactoferrinas <i>&#945;</i>&#45;lactorfina y <i>&#946;</i>&#45;lactorfina (Clare y Swaisgood 2000, Ijas <i>et al.</i> 2004); los fragmentos de lactotransferina llamados lactoferrocinas A, B y C (Haileselassie <i>et al.</i> 1999, Clare y Swaisgood 2000) y las casoxinas C y D asi como la <i>&#945;</i>&#45;case&iacute;na exorfina (Mart&iacute;nez y Mart&iacute;nez 2006). Por ejemplo, el p&eacute;ptido 50&#45;53 de la <i>&#945;</i>&#45;lactorfina, la fracci&oacute;n Tyr&#45;Gly&#45;Leu&#45;Phe proveniente de la <i>&#946;</i>&#45;lactoglobulina (Kamau <i>et al.</i> 2010a), la secuencia Tyr&#45;Leu&#45;Gly&#45;Ser&#45;Gly&#45;Tyr&#45;OCH3 aislada de la lactoferroxina A (Mart&iacute;nez y Mart&iacute;nez 2006) y los fragmentos Pro&#45;Glu&#45;Gly&#45;Asp y Tyr&#45;Leu&#45;Leu&#45;Phe de las <i>&#946;</i>&#45;lactoglobulinas, son reconocidos por su actividad opioide (Kamau <i>et al.</i> 2010b). As&iacute; como las <i>&#946;</i>&#45;lactorfinas potencian la motilidad intestinal, las <i>&#946;</i>&#45;lactotencinas presentan numerosos efectos opioides tales como analg&eacute;sicos, relajantes hipocolesterol&eacute;micos, y potenciandores de la memoria (Hern&aacute;ndez&#45;Ledesma <i>et al.</i> 2011).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Biop&eacute;ptidos en la regulaci&oacute;n del sistema inmune</b></font></p>  	     <p align="justify"><font face="verdana" size="2">Otra clase de p&eacute;ptidos    con actividad biol&oacute;gica son aquellos que pueden funcionar como inmunomoduladores    o inmunopotenciadores; es decir, alteran la funci&oacute;n biol&oacute;gica    de algunas prote&iacute;nas que poseen la habilidad de modificar el sistema    inmune a trav&eacute;s de diversos medios tales como: la proliferaci&oacute;n    de linfocitos (Clare y Swaisgood 2000, Agyei y Danquah 2012, Feng <i>et al.</i>    2012), el incremento en la actividad fagoc&iacute;tica de algunos macr&oacute;fagos    (Vioque <i>et al.</i> 2000), el aumento en la s&iacute;ntesis de anticuerpos    (Korhonen y Philanto 2006), la estimulaci&oacute;n de inmunoglobulinas (Agyei    y Danquah 2012) y la regulaci&oacute;n de citoquinas (Madureira <i>et al.</i>    2010); las citoquinas son una red de intermediarios que operan diferentes funciones    inmunes en el organismo (Ebringer <i>et al.</i> 2008). Varios estudios sugieren    que algunas secuencias de biop&eacute;ptidos refuerzan el sistema inmune, alivian    reacciones al&eacute;rgicas, potencian la actividad de los linfocitos y mejoran    la reacci&oacute;n contra microorganismos como <i>Klebsiella pneumoniae</i>    (Claire y Swaisgood 2000, Vioque <i>et al.</i> 2000, Kamau <i>et al.</i> 2010a).    Sin embargo, la estructura de los biop&eacute;ptidos que est&aacute; relacionada    con la actividad inmunomoduladora a&uacute;n no est&aacute; definida, se cree    que una arginina en la posici&oacute;n N&#45; o C&#45; terminal del p&eacute;ptido    es importante para que sea reconocida por los receptores de membrana (Haque    <i>et al.</i> 2009) y que la presencia de una glutamina tiene influencia sobre    el sistema inmune (Chanput <i>et al.</i> 2010). As&iacute; mismo, los p&eacute;ptidos    con actividad inmunomoduladora pueden favorecer el transporte de iones, &eacute;ste    tipo de p&eacute;ptidos son principalmente caseinofosfop&eacute;ptidos, que    tienen la capacidad de formar sales solubles organofosforadas y de transportar    minerales como hierro o calcio; as&iacute; como actuar previniendo caries mediante    la calcificaci&oacute;n de los dientes (Vioque <i>et al.</i> 2000, Singh y Sachan    2011). En este sentido, se ha estudiado en cultivos celulares la proliferaci&oacute;n    de linfocitos, la cual aument&oacute; significativamente en presencia de los    p&eacute;ptidos <i>&#946;</i>&#45;casmorfina7, <i>&#946;</i>&#45;casokina&#45;10,    Tyr&#45;Gly y Tyr&#45;Gly&#45;Gly (Kayser y Meisel 1996). Por otra parte, la    LFcina (fragmento de la lactoferrina) puede inhibir la acci&oacute;n de citoquinas    liberadas, como la lsoleucina&#45;6 y tambi&eacute;n posee la capacidad de atravesar    la membrana nuclear, entrar en la c&eacute;lula y unirse al DNA, o bien actuar    como factor de transcripci&oacute;n; adem&aacute;s, este fragmento posee actividad    antitumoral, siendo capaz de inhibir la met&aacute;stasis e inducir la apoptosis    selectiva de c&eacute;lulas cancerosas (Mart&iacute;nez y Mart&iacute;nez 2006),    adicionalmente posee propiedades anticancer&iacute;genas, inmunomoduladoras    y antimicrobianas contra bacterias, hongos y virus; dichas propiedades pueden    estar relacionadas con la presencia de residuos de tript&oacute;fano o arginina    en el p&eacute;ptido. Sin embargo, las facultades antiinflamatorias e inmunomoduladoras    de la LFcina est&aacute;n m&aacute;s relacionadas con la presencia de cargas    positivas dentro de la mol&eacute;cula (Haque <i>et al.</i> 2009).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>P&eacute;ptidos multifuncionales</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se han reportado p&eacute;ptidos que presentan m&aacute;s de una funci&oacute;n bioactiva (Weimann <i>et al.</i> 2009, Udenigwe y Aluko 2012), por ejemplo, la fracci&oacute;n Thr&#45;Thr&#45;Met&#45;Pro&#45;Leu&#45;Trp de las case&iacute;nas <i>&#945;</i>S1 presenta funciones inmunomodulatorias como la estimulaci&oacute;n de la fagocitosis de macr&oacute;fagos (Kaysery Meisel 1996) y presenta actividad inhibitoria de la enzima ECA (Udenigwe y Aluko 2012). Por otra parte, la fracci&oacute;n 206&#45;208 de las case&iacute;nas <i>&#945;</i><i>S2,</i> ejerce funci&oacute;n antimicrobiana, actividad antioxidante y es un potente antihipertensivo (Pripp 2005). Otro p&eacute;ptido multifuncional es la secuencia Ala&#45;Gly&#45;Thr&#45;Trp&#45;Tyr, correspondiente al fragmento 15&#45;20 de las <i>&#946;</i>&#45;lactoglobulinas, que presenta actividad inhibitoria de la enzima ECA, (FitzGerald <i>et al.</i> 2004, Madureira <i>et al.</i> 2010) as&iacute; como actividad antioxidante (Kamau <i>et al.</i> 2010b). Otro ejemplo es la <i>&#946;</i>&#45;lactorfina, que ha demostrado actividad opioide y capacidad para inhibir la actividad de la ECA (Udenigwe y Aluko 2012). Finalmente, la <i>&#946;</i>&#45;casomorfina 7 ofrece actividad opioide a nivel intestinal (Plaisanci&eacute; <i>et al.</i> 2013) y participa en la proliferaci&oacute;n de linfocitos (Kayser y Meisel 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Biodisponibilidad</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La efectividad de los biop&eacute;ptidos depende de su capacidad para alcanzar intacto el &oacute;rgano blanco (Madureira <i>et al.</i> 2010). Al ingerirse las prote&iacute;nas, son desnaturalizadas por los &aacute;cidos g&aacute;stricos y la pepsina presentes en el est&oacute;mago, posteriormente los fragmentos son hidrolizados por proteasas a p&eacute;ptidos, los cuales van a las c&eacute;lulas de la mucosa para ser hidrolizados por peptidasas, una parte de &eacute;stos son aprovechados por enterocitos y otra fracci&oacute;n pasa al h&iacute;gado para emplearse en las funciones hep&aacute;ticas, el resto se incorpora a la circulaci&oacute;n general para ser utilizados por otros &oacute;rganos (Mart&iacute;nez y Mart&iacute;nez 2006). En general, se ha observado que los biop&eacute;ptidos presentan efectos ben&eacute;ficos, sin embargo, &eacute;stos pueden inhibirse o disminuirse antes de llegar a su &oacute;rgano blanco, debido a las diferentes condiciones a las que se enfrentan en el organismo (Madureira <i>et al.</i> 2010). Por ejemplo, los p&eacute;ptidos peque&ntilde;os como los dip&eacute;ptidos y trip&eacute;ptidos han presentado actividad <i>in vivo,</i> resistiendo la peptid&oacute;lisis, logrando as&iacute; ser absorbidos intactos para posteriormente pasar a la circulaci&oacute;n (Sipola <i>et al.</i> 2001). Aunado a lo anterior tambi&eacute;n debe considerarse los tratamientos t&eacute;rmicos a los que son sometidos los productos l&aacute;cteos durante su procesamiento. Dichos tratamientos pueden ocasionar la desnaturalizaci&oacute;n e hidr&oacute;lisis de las prote&iacute;nas y por lo tanto la formaci&oacute;n de p&eacute;ptidos diferentes, mismos que pueden poseer o no bioactividad (Costa <i>et al.</i> 2007). Por otra parte, considerando la carga neta, el peso molecular, la lipofilicidad y la solubilidad de los p&eacute;ptidos, &eacute;stos pueden ser qu&iacute;micamente modificados para aumentar su estabilidad por medio de diferentes t&eacute;cnicas (Ricci <i>et al.</i> 2010; Udenigwe y Aluko 2012), como lo son: la lipidizaci&oacute;n (aumento de la absorci&oacute;n intestinal), la glicosilaci&oacute;n (aumento de la permeabilidad y estabilidad en el suero sangu&iacute;neo) &oacute; la microencapsulaci&oacute;n (incremento de la farmacocin&eacute;tica y la permeabilidad). Cabe mencionar que &eacute;stas t&eacute;cnicas pueden ofrecer desventajas como la disminuci&oacute;n de la afinidad al sitio de uni&oacute;n del receptor del p&eacute;ptido o el aumento de la uni&oacute;n a algunas prote&iacute;nas s&eacute;ricas (Ricci <i>et al.</i> 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>T&eacute;cnicas de identificaci&oacute;n y cuantificaci&oacute;n de biop&eacute;ptidos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Para la identificaci&oacute;n y cuantificaci&oacute;n de los biop&eacute;ptidos, es necesario extraerlos de la matriz alimentaria en donde se encuentran, lo cual se realiza por medio de t&eacute;cnicas de separaci&oacute;n, tales como; la centrifugaci&oacute;n y la separaci&oacute;n con membranas o filtros (Quiros <i>et al.</i> 2007, Minervini <i>et al.</i> 2009, Gonz&aacute;lez&#45;Gonz&aacute;lez <i>et al.</i> 2011, Otte <i>et</i> <i>al.</i> 2011), posteriormente se identifican los p&eacute;ptidos y cuantifican (Nielsen <i>et al.</i> 2009). Dentro de las t&eacute;cnicas utilizadas para su cuantificaci&oacute;n, se incluyen la electroforesis en gel de poliacrilamida con dodecilsulfato s&oacute;dico (SDS&#45;PAGE) (Pritchard <i>et al.</i> 2010) y la cromatograf&iacute;a l&iacute;quida de alta resoluci&oacute;n en fase reversa (HPLC&#45;RP), por medio de la cual se obtienen cromatogramas con distintos picos que representan diferentes p&eacute;ptidos (Miguel <i>et al.</i> 2006; Ferreira y Eca 2007, Ong y Shah 2008, Ahn <i>et al.</i> 2009). La secuenciaci&oacute;n de los biop&eacute;ptidos se lleva a cabo a partir de las fracciones pept&iacute;dicas (Ong y Shah 2008, Ahn <i>et al.</i> 2009) algunas de las t&eacute;cnicas usadas para &eacute;ste prop&oacute;sito son la cromatograf&iacute;a de gases acoplada a espectrometr&iacute;a de masas (CG&#45;MS) (Quiros <i>et al.</i> 2007) o la cromatograf&iacute;a l&iacute;quida acoplada a espectrometr&iacute;a de masas (LC&#45;MS/MS), &eacute;stas t&eacute;cnicas logran separar las mol&eacute;culas de los analitos e interpretarlas en cromatogramas (Miguel <i>et al.</i> 2007, Nielsen <i>et al.</i> 2009) y es ampliamente recomendada para la identificaci&oacute;n de di, tri y tetra p&eacute;ptidos inclusive ramificados y no ramificados (Larichi <i>et al.</i> 2013).</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">A la fecha existe suficiente evidencia cient&iacute;fica que sustenta que algunos p&eacute;ptidos liberados de las prote&iacute;nas de origen l&aacute;ctico, presentan bioactividad. Dichos p&eacute;ptidos se encuentran inactivos cuando est&aacute;n encriptados en las prote&iacute;nas, pero al hidrolizarse por las enzimas digestivas o microbianas, pueden ejercer su funci&oacute;n actuando sobre los sistemas gastrointestinal, nervioso, cardiovascular e inmune influyendo positivamente en la salud del consumidor. Sin embargo, es necesario investigar con profundidad, ya que se ha explorado poco la biodisponibilidad de los p&eacute;ptidos bioactivos despu&eacute;s de someter los productos l&aacute;cteos a procesos t&eacute;rmicos o durante la vida en anaquel. As&iacute; mismo, es importante recalcar que la efectividad de los p&eacute;ptidos bioactivos est&aacute; condicionada a alcanzar al &oacute;rgano blanco sin ser hidrolizado, por lo que es de vital relevancia la utilizaci&oacute;n de modelos <i>in vitro</i> que permitan simular las condiciones gastrointestinales as&iacute; como estudios <i>in vivo</i> que favorezcan la comprensi&oacute;n de los mecanismos involucrados en &eacute;ste proceso.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Abad&iacute;a&#45;Garc&iacute;a L, Cardador A, Mart&iacute;n del Campo ST, Arv&iacute;zu SM, Casta&ntilde;o&#45;Tostado E, Regalado&#45;Gonz&aacute;lez C, Garc&iacute;a&#45;Almendarez B, Amaya&#45;Llano SL (2013) Influence of probiotic strains added to cottage cheese on generation of potentially antioxidant peptides, anti&#45;listerial activity, and survival of probiotic microorganisms in simulated gastrointestinal conditions. 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Food Science Technology Reserch 23: 62&#45;69.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3032596&pid=S2007-9028201400030000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Ahn JE, Park SY, Atwa A, Gibbs BF, Lee BH (2009) Angiotensin l&#45;converting enzyme (ACE) inhibitory peptides from whey fermented by <i>lactobacillus</i> species. Journal of Food Biochemistry 33: 589&#45;602.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3032598&pid=S2007-9028201400030000800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Aihara K, Kajimoto O, Hirata H, Takahashi R, Nakamura Y (2005) Effect of Powdered Fermented Milk with <i>Lactobacillus helveticus</i> on Subjects with High&#45;Normal Blood Pressure or Mild Hypertension. Journal of the American College of Nutrition 24(4): 257 265.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3032600&pid=S2007-9028201400030000800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Alvarado CC, Guerra M (2010) Lactosuero como fuente de p&eacute;ptidos bioactivos. 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