<?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>0034-7418</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Químico - Farmacéuticas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. cienc. quim. farm.]]></abbrev-journal-title>
<issn>0034-7418</issn>
<publisher>
<publisher-name><![CDATA[Departamento de Farmácia, Facultad de Ciencias, Universidade Nacional da Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74182011000100007</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Efeitos biológicos das antocianinas no processo aterosclerótico]]></article-title>
<article-title xml:lang="en"><![CDATA[Biological effects of anthocyanins on the atherosclerotic process]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardoso]]></surname>
<given-names><![CDATA[Luciana Marques]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Viana Leite]]></surname>
<given-names><![CDATA[Joâo Paulo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gouveia Peluzio]]></surname>
<given-names><![CDATA[Maria do Carmo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Federal de Viçosa Programa de Pós-Graduaâo em Bioquímica Agrícola Departamento de Bioquímica e Biologia Molecular]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>, Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Federal de Viçosa Departamento de Nutrição e Saúde ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2011</year>
</pub-date>
<volume>40</volume>
<numero>1</numero>
<fpage>116</fpage>
<lpage>138</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74182011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74182011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74182011000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[As antocianinas são metabólitos secundários biossintetizados por plantas e pertencentes ao grupo dos flavonóides. Pesquisas indicam que as antocianinas podem aumentar a resistência da LDL à oxidação, comparado a outros compostos com alto poder antioxidante, como o ácido L-ascórbico, e reduzir fatores pró-inflamatórios, como citocinas, quimiocinas, moléculas de adesão e metaloproteinases. Como a inflamação e a oxidação são processos característicos da aterosclerose, tem se investigado o efeito das antocianinas no processo aterosclerótico e há evidências que estes compostos podem diminuir o desenvolvimento e a progressão das lesões ateroscleróticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Anthocyanins are secondary metabolites biosynthesized by plants and belonging to the group of flavonoids. Research indicates that anthocyanins can increase resistance of LDL to oxidation, compared to other compounds with high antioxidant properties, such as L-ascorbic acid, and reduce pro-inflammatory factors such as cytokines, chemokines, adhesion molecules and metalloproteinases. As inflammation and oxidation processes are characteristic of atherosclerosis, has investigated the effect of anthocyanins in the atherosclerotic process and there is evidence that these compounds can reduce the development and progression of atherosclerotic lesions.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Antocianinas]]></kwd>
<kwd lng="pt"><![CDATA[Aterosclerose]]></kwd>
<kwd lng="pt"><![CDATA[Antioxidante]]></kwd>
<kwd lng="pt"><![CDATA[Antiinflamatório]]></kwd>
<kwd lng="en"><![CDATA[Anthocyanins]]></kwd>
<kwd lng="en"><![CDATA[atherosclerosis]]></kwd>
<kwd lng="en"><![CDATA[antioxidants]]></kwd>
<kwd lng="en"><![CDATA[antiinflamator]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="right">Art&iacute;culo de Revisi&oacute;n</p>     <p align="center"><b><font size="4">Efeitos biol&oacute;gicos das antocianinas no processo ateroscler&oacute;tico</font></b></p>     <p align="center"><font size="3"><b>Biological effects of anthocyanins on the atherosclerotic proces</b></font></p>     <p align="center"> Luciana Marques Cardoso ,<sup>1</sup> , Jo&acirc;o Paulo Viana  Leite<sup>1</sup> , Maria do Carmo Gouveia  Peluzio<sup>2</sup></p>      <p><sup>1</sup> Departamento de Bioqu&iacute;mica e Biologia Molecular, Programa de P&oacute;s-Gradua&ccedil;&acirc;o em Bioqu&iacute;mica  Agr&iacute;cola, Universidade Federal de Vi&ccedil;osa, Av. Peter Henry s/n, 36570-000 Vi&ccedil;osa, MG, Brasil,  e-mail: <a href="mailto"luciana.cardoso@ufv.br>luciana.cardoso@ufv.br</a>, fax: (31) 3899-2373.    <br> <sup>2</sup> Departamento de Nutri&ccedil;&atilde;o e Sa&uacute;de, Universidade Federal de Vi&ccedil;osa, Vi&ccedil;osa, MG, Brasil.</p>     <p>Recibido para evaluaci&oacute;n: 5 de abril de 2011 Aceptado para publicaci&oacute;n: 30 de mayo de 2011</p> <hr>      <p><b><font size="3">RESUMO</font></b></p>      <p> As antocianinas s&atilde;o metab&oacute;litos secund&aacute;rios biossintetizados por plantas e pertencentes  ao  grupo  dos  flavon&oacute;ides.  Pesquisas  indicam  que  as  antocianinas  podem  aumentar a resist&ecirc;ncia da LDL &agrave; oxida&ccedil;&atilde;o, comparado a outros compostos com alto  poder antioxidante, como o &aacute;cido L-asc&oacute;rbico, e reduzir fatores pr&oacute;-inflamat&oacute;rios,  como  citocinas,  quimiocinas,  mol&eacute;culas  de  ades&atilde;o  e  metaloproteinases.  Como  a  inflama&ccedil;&atilde;o e a oxida&ccedil;&atilde;o s&atilde;o processos caracter&iacute;sticos da aterosclerose, tem se investigado o efeito das antocianinas no processo ateroscler&oacute;tico e h&aacute; evid&ecirc;ncias que estes  compostos podem diminuir o desenvolvimento e a progress&atilde;o das les&otilde;es ateroscler&oacute;ticas.</p>      ]]></body>
<body><![CDATA[<p><b>Palavras chaves</b>: Antocianinas, Aterosclerose, Antioxidante, Antiinflamat&oacute;rio .</p> <hr>      <p><b><font size="3">SUMMARY</font></b></p>      <p> Anthocyanins  are  secondary  metabolites  biosynthesized  by  plants  and  belonging  to the group of flavonoids. Research indicates that anthocyanins can increase resistance of LDL to oxidation, compared to other compounds with high antioxidant  properties,  such  as  L-ascorbic  acid,  and  reduce  pro-inflammatory  factors  such  as  cytokines,  chemokines,  adhesion  molecules  and  metalloproteinases.  As  inflammation and oxidation processes are characteristic of atherosclerosis, has investigated the effect of anthocyanins in the atherosclerotic process and there is evidence that these  compounds can reduce the development and progression of atherosclerotic lesions.</p>      <p><b>Key words</b>:     nthocyanins, atherosclerosis, antioxidants, antiinflamator.</p> <hr>      <p><b><font size="3">INTRODU&Ccedil;&Atilde;O</font></b></p>      <p>As antocianinas s&atilde;o pigmentos naturais que pertencem ao grupo de metab&oacute;litos secund&aacute;rios vegetais conhecidos como flavon&oacute;ides. Algumas das principais fun&ccedil;&otilde;es das antocianinas nos vegetais s&atilde;o a atra&ccedil;&atilde;o de agentes polinizadores e dispersores de sementes e  a prote&ccedil;&atilde;o a diversos tecidos da planta durante as etapas de seu ciclo de vida (1). </p>      <p>As antocianinas ocorrem mais comumente na natureza como glicos&iacute;deos de geninas  antocianidinas, podendo estar aciladas com &aacute;cidos org&acirc;nicos como, cum&aacute;rico, caf&eacute;ico,  fer&uacute;lico, p-hidroxibenz&oacute;ico, ac&eacute;tico, mal&ocirc;nico, succ&iacute;nico, ox&aacute;lico e &aacute;cidos m&aacute;licos (2).  Sua estrutura geral &eacute; derivada do c&aacute;tion flav&iacute;lico (<a href="#fig01">Figura 1</a>)</p>     <p>    <center><a name="fig01"></a><img src="img/revistas/rccqf/v40n1/v40n1a07fig01.gif"></center></p>      <p>As  antocianinas  podem  apresentar  diferentes  formas  estruturais,  tais  como  o  c&aacute;tion  flav&iacute;lio, a base quinoidal, o carbinol e a chalcona. Essas estruturas podem sofrer interfer&ecirc;ncia de  diversos fatores, entre estes, temperatura, pH e poss&iacute;veis liga&ccedil;&otilde;es com outras  subst&acirc;ncias qu&iacute;micas,  proporcionando diferentes colora&ccedil;&otilde;es &agrave;s antocianinas. O pH &eacute;  o fator que mais influencia na colora&ccedil;&atilde;o das antocianinas, visto que, em fun&ccedil;&atilde;o de sua  acidez ou alcalinidade, estas podem apresentar diferentes estruturas (3).</p>      ]]></body>
<body><![CDATA[<p>Com o aumento do pH ocorre nas antocianinas a protona&ccedil;&atilde;o do c&aacute;tion flav&iacute;lio e,  conseq&uuml;entemente, diminui&ccedil;&atilde;o do n&uacute;mero de liga&ccedil;&otilde;es duplas conjugadas,  que s&atilde;o respons&aacute;veis pelo aumento nos m&aacute;ximos de absor&ccedil;&atilde;o destas subst&acirc;ncias. Em meio &aacute;cido (pH  = 1), as antocianidinas apresentam colora&ccedil;&atilde;o na regi&atilde;o vis&iacute;vel do vermelho  (c&aacute;tion flav&iacute;lio) e em pH ainda &aacute;cido, por&eacute;m maior (pH = 4,5), as antocianidinas apresentam  uma colora&ccedil;&atilde;o vermelha bem menos intensa, pr&oacute;xima ao incolor, como mostra a <a href="#fig02">figura 2</a> (3).</p>     <p>    <center><a name="fig02"></a><img src="img/revistas/rccqf/v40n1/v40n1a07fig02.gif"></center></p>      <p>As antocianinas s&atilde;o sol&uacute;veis em &aacute;gua e podem ser facilmente extra&iacute;das com solventes  polares, sendo os solventes alco&oacute;licos, como metanol e etanol, os mais utilizados. Muitos trabalhos  t&ecirc;m empregado solventes extratores alco&oacute;licos acidificados para favorecer  a extra&ccedil;&atilde;o, pois al&eacute;m de aumentar a estabilidade das antocianinas, dificulta o  aparecimento de fungos (5). Por&eacute;m, o uso de solventes &aacute;cidos para a extra&ccedil;&atilde;o de antocianinas  deve ser cauteloso, pois o excesso de &aacute;cido pode promover sua hidr&oacute;lise, levando a forma&ccedil;&atilde;o de antocianidinas. O aquecimento durante a extra&ccedil;&atilde;o tamb&eacute;m deve ser observado, pois estudos indicam que as antocianinas s&atilde;o termicamente est&aacute;veis at&eacute; 60 &deg;C (4,  6).</p>      <p>A quantidade  e  o  tipo  das  antocianinas  nos  vegetais  tamb&eacute;m  sofrem  influ&ecirc;ncia  de  alguns  determinantes,  como  as  condi&ccedil;&otilde;es  de  cultivo,  tempo  de  plantio,  exposi&ccedil;&atilde;o  &agrave;  luz UV e m&eacute;todo de colheita. Por esse motivo, a compara&ccedil;&atilde;o de teores de antocianinas  entre diferentes culturas de um mesmo vegetal, como frutas, pode gerar resultados bastante distintos (7).</p>      <P>H&aacute;  diversos  m&eacute;todos  descritos  na  literatura  para  quantificar  as  antocianinas  (totais  ou individuais), dentre os quais se destacam aqueles que envolvem espectrofotometria  UV-VIS, cromatografia l&iacute;quida de alta efici&ecirc;ncia (CLAE) e espectrometria de massas  (8, 9, 10).</p>      <p>T&ecirc;m-se observado um crescente interesse no uso de antocianinas em diversos segmentos,  dentre  os   quais  se  destacam  as  ind&uacute;strias  aliment&iacute;cia,  farmac&ecirc;utica  e  cosm&eacute;tica,  onde podem ser aplicadas, por exemplo, como corantes, principalmente de colora&ccedil;&atilde;o  vermelha, sendo estes uns dos corantes naturais mais dif&iacute;ceis de serem encontrados na  natureza em forma est&aacute;vel. Entretanto, o uso industrial de antocianinas como corantes ainda &eacute;  restrito devido a algumas limita&ccedil;&otilde;es, dentre as quais podemos citar a baixa  estabilidade e a capacidade corante reduzida, quando comparadas a corantes sint&eacute;ticos;  al&eacute;m de dificuldades na etapa de obten&ccedil;&atilde;o e pelo elevado custo desse processo (5).  Como importantes fontes de antocianina na dieta podem ser citadas as frutas como o  a&ccedil;a&iacute;, ameixa, amora, cereja, figo, framboesa, uva, ma&ccedil;&atilde;, morango e acerola e os vegetais,  como o repolho roxo, batata roxa, berinjela, entre outros (1).</p>      <p>Estima-se que a ingest&atilde;o de antocianinas nos Estados Unidos, principalmente na forma  de  cianidina  e  malvidina,  esteja  entre  12  a  215  mg/dia  por  indiv&iacute;duo  (11),  a  qual  &eacute;  maior que outros flavon&oacute;ides incluindo quercetina, kaempferol, miricetina, apigenina  e luteolina (12). </p>      <p>Al&eacute;m de suas fun&ccedil;&otilde;es como corantes naturais, as antocianinas t&ecirc;m apresentado grandes  benef&iacute;cios &aacute; sa&uacute;de devido suas atividades biol&oacute;gicas, que incluem propriedades antioxidantes (13), antiinflamat&oacute;rias (14), inibi&ccedil;&atilde;o da oxida&ccedil;&atilde;o do LDL (15), diminui&ccedil;&atilde;o dos  riscos de doen&ccedil;as cardiovasculares (16) e de c&acirc;ncer (17).</p>      <p><b>Propriedades antioxidantes das antocianinas</b></p>      ]]></body>
<body><![CDATA[<p>O  estresse  oxidativo  &eacute;  caracterizado  por  um  desequil&iacute;brio  entre  agentes  oxidantes,  como os radicais livres, e mol&eacute;culas antioxidantes, favorecendo o aumento de esp&eacute;cies  oxidantes no sistema biol&oacute;gico. Nessa situa&ccedil;&atilde;o, os oxidantes podem provocar danos em  estruturas celulares, como os &aacute;cidos nucl&eacute;icos, prote&iacute;nas e lip&iacute;dios (30). </p>      <p>Radical livre &eacute; uma esp&eacute;cie qu&iacute;mica que tem el&eacute;trons desemparelhados, sendo por isso  inst&aacute;vel e com grande capacidade de reatividade. Outras esp&eacute;cies qu&iacute;micas tamb&eacute;m inst&aacute;veis  podem-se formar a partir dos radicais livres, que embora, n&atilde;o tenham el&eacute;trons  desemparelhados, possuem similar instabilidade estrutural a dos radicais livres. Assim,  para designar as esp&eacute;cies reativas na forma de radical livre e na forma n&atilde;o radical s&atilde;o  utilizados os termos esp&eacute;cies reativas de oxig&ecirc;nio (EROs) e esp&eacute;cies reativas de nitrog&ecirc;nio (ENOs) (31).</p>      <p>As  esp&eacute;cies  reativas  s&atilde;o  formadas  a  partir  de  in&uacute;meras  rea&ccedil;&otilde;es  no  organismo,  como  parte de seu metabolismo normal. Como exemplos est&aacute; a forma&ccedil;&atilde;o de &iacute;ons super&oacute;xidos por c&eacute;lulas de defesa imunol&oacute;gica a partir do oxig&ecirc;nio molecular (O<sub>2</sub>) por meio  da respira&ccedil;&atilde;o mitocondrial, assim como a forma&ccedil;&atilde;o de &oacute;xido n&iacute;trico como mecanismo  de vasodilata&ccedil;&atilde;o vascular (32). Por&eacute;m condi&ccedil;&otilde;es patol&oacute;gicas como a  inflama&ccedil;&atilde;o e fontes ex&oacute;genas como o cigarro, poluentes do ar, radia&ccedil;&atilde;o, medicamentos e dieta podem  aumentar a produ&ccedil;&atilde;o das esp&eacute;cies reativas (30).</p>      <p>A ocorr&ecirc;ncia de um estresse oxidativo moderado, freq&uuml;entemente &eacute; acompanhada pelo  aumento das defesas antioxidantes enzim&aacute;ticas, mas a produ&ccedil;&atilde;o de uma grande  quantidade de radicais livres pode causar danos e morte celular (33). Os danos oxidativos  induzidos nas c&eacute;lulas e tecidos t&ecirc;m sido relacionados com a etiologia de v&aacute;rias doen&ccedil;as,  incluindo a aterosclerose. </p>      <p>Os radicais livres, principalmente as sust&acirc;ncias reativas de oxig&ecirc;nio (EROs), parecem  ser uma das principais causas da disfun&ccedil;&atilde;o endotelial que precede e promove a aterog&ecirc;nese.  As EROs podem lesar membranas celulares e o n&uacute;cleo, interagir com mediadores  vasomotores, inativando seus efeitos vasodilatadores, e principalmente, oxidar os lip&iacute;dios da LDL, elemento chave na aterosclerose (34). </p>      <p>O organismo humano possui mecanismos de defesa antioxidante, os quais atuam intracelular e  extracelularmente e mant&eacute;m o equil&iacute;brio redox da c&eacute;lula, assegurando que o  aumento das EROs seja transit&oacute;rio. Existem dois mecanismos antioxidantes: o enzim&aacute;tico e  o n&atilde;o enzim&aacute;tico, os quais agem cooperativamente para manter o equil&iacute;brio dos  radicais livres no organismo (31).</p>      <p>O mecanismo de defesa enzim&aacute;tico &eacute; a primeira linha de defesa do organismo contra  os danos oxidativos. O sistema &eacute; constitu&iacute;do por um conjunto de enzimas, tais como a  super&oacute;xido dismutase, glutationa peroxidase, glutationa redutase, catalase, tiorredoxinas,  peroxirredoxinas e in&uacute;meras outras redutases (31). J&aacute; o mecanismo n&atilde;o-enzim&aacute;tico  &eacute; constitu&iacute;do por um grande n&uacute;mero de compostos de baixo peso molecular, ingeridos  pela dieta (nutrientes e n&atilde;o-nutrientes) ou sintetizados no organismo, como as vitaminas A, C e E, o  pept&iacute;deo glutationa e os flavon&oacute;ides (31, 22). </p>      <p>Estudos in vitro e in vivo mostram que as antocianinas podem atenuar o estresse oxidativo envolvido no  processo ateroscler&oacute;tico. Sendo que v&aacute;rios mecanismos podem estar  envolvidos nesse processo, como a capacidade das antocianinas de inibir a oxida&ccedil;&atilde;o do  LDL (15) e reduzir a inj&uacute;ria oxidativa das c&eacute;lulas endoteliais vasculares (35).</p>      <p>Os efeitos biol&oacute;gicos antioxidantes das antocianinas dependem da sua estrutura qu&iacute;mica,  tais como grau de glicosila&ccedil;&atilde;o e o n&uacute;meros de grupos hidroxilas (36). O n&uacute;mero  de hidroxilas (-OH) total, a presen&ccedil;a de hidroxilas nas posi&ccedil;&otilde;es C3&acute; e C4&acute; no anel B e  no C3 do anel C do n&uacute;cleo fundamental flav&ocirc;nico parecem ser os principais requisitos  estruturais para as antocianinas inibirem a inj&uacute;ria oxidativa das c&eacute;lulas endoteliais e a  atividade  intracelular  de  radicais  livres.  Por  outro  lado,  a  presen&ccedil;a  de  metila&ccedil;&otilde;es  nas  posi&ccedil;&otilde;es (C3&acute;, C4&acute;e C3) reduzem esses efeitos. Comparando as ubstitui&ccedil;&otilde;es por diferentes  a&ccedil;&uacute;cares,  as  antocianinas  que  possuem  os  monossacar&iacute;deos  glicose  e  galactose  apresentam benef&iacute;cios antioxidantes superiores com rela&ccedil;&atilde;o as que cont&ecirc;m dissacar&iacute;deos (35). </p>      <p>Nos <a href="img/revistas/rccqf/v40n1/v40n1a07tab01.gif">quadros 1</a> e <a href="img/revistas/rccqf/v40n1/v40n1a07tab02.gif">2</a> encontram-se resumos de trabalhos realizados in vivo e in vitro, respectivamente, que correlacionam a atividade antioxidante das antocianinas ou de fru- tos que s&atilde;o fontes caracter&iacute;sticas desta classe de flavon&oacute;ides.</p>      ]]></body>
<body><![CDATA[<p>A capacidade antioxidante das antocianinas tamb&eacute;m tem sido extensivamente avaliada  nos derivados dos vegetais ricos nesta classe de flavon&oacute;ides como nas polpas e sucos,  como representado no <a href="img/revistas/rccqf/v40n1/v40n1a07tab03.gif">quadro 3</a>.</p>      <p><b>Propriedades antiinflamat&oacute;rias das antocianinas</b></p>      <p>Existem evid&ecirc;ncias que comprovam que as antocianinas tamb&eacute;m apresentam propriedades  antiinflamat&oacute;rias. Alguns autores sugerem que os efeitos antiinflamat&oacute;rios das  antocianinas podem ser explicados por diferentes mecanismos, tais como:</p>      <p>a)  Inibi&ccedil;&atilde;o da ativa&ccedil;&atilde;o do fator nuclear Kappa B (NF-kB) em humanos.   Dentre  os  mecanismos  regulat&oacute;rios  da  resposta  inflamat&oacute;ria,  a  via  do  fator  nuclear kappa B (NF-kB) representa uma via crucial no controle da transcri&ccedil;&atilde;o  de  v&aacute;rios  genes  pr&oacute;-inflamat&oacute;rios,  como  citocinas,  quimiocinas,  mol&eacute;culas  de  ades&atilde;o, prote&iacute;nas de fase aguda, reguladores da apoptose e da prolifera&ccedil;&atilde;o celular  (25).  Portanto, a inibi&ccedil;&atilde;o desta via pode contribuir para a redu&ccedil;&atilde;o do processo  ateroscler&oacute;tico.</p>       <p>b)  Redu&ccedil;&atilde;o da concentra&ccedil;&atilde;o plasm&aacute;tica da prote&iacute;na  quimiot&aacute;tica de mon&oacute;citos 1 (MCP-1) em humanos, in vitro e in vivo.   A MCP-1 &eacute; um biomarcador envolvido na evolu&ccedil;&atilde;o de doen&ccedil;as inflamat&oacute;rias e  &eacute; expressa, principalmente nas fases iniciais da aterosclerose (40). Esta prote&iacute;na  est&aacute; envolvida na aterog&ecirc;nese atrav&eacute;s de diferentes mecanismos. Ela promove o  recrutamento de mon&oacute;citos e linf&oacute;citos T circulantes do sangue para o espa&ccedil;o  subendotelial e contribui para a diferencia&ccedil;&atilde;o dos macr&oacute;fagos em c&eacute;lulas espumosas  (49). A MCP-1 &eacute; uma quimiocina membro da subfam&iacute;lia de quimiocinas  secretadas por v&aacute;rios tipos de c&eacute;lulas presentes na parede arterial, como as c&eacute;lulas  endoteliais, as c&eacute;lulas musculares lisas, fibroblastos e macr&oacute;fagos e sua express&atilde;o  pode ser mediada por fatores de transcri&ccedil;&atilde;o NF-kB (50).</p>        <p>In vitro, o extrato aquoso de Hibiscus sabdariffa (10, 50 e 100 &micro;g/mL), rico nas  antocianidinas delfinidina e cianidina, promoveu uma efetiva prote&ccedil;&atilde;o da morte  de c&eacute;lulas sangu&iacute;neas humanas induzidas por adi&ccedil;&atilde;o de per&oacute;xido de hidrog&ecirc;nio  (H<sub>2</sub>O<sub>2</sub>). Houve redu&ccedil;&atilde;o na concentra&ccedil;&atilde;o de MCP-1 de uma maneira dose dependente. O mesmo extrato de Hibiscus sabdariffa, por&eacute;m liofilizado, foi administrado oralmente na dose de 10 g, a 5 homens e 5 mulheres, ambos saud&aacute;veis, com  idade entre 23 e 50 anos. As concentra&ccedil;&otilde;es plasm&aacute;ticas de MCP-1 reduziram-se  significativamente com a administra&ccedil;&atilde;o aguda de 10 g do extrato liofilizado de  Hibiscus sabdariffa (40).</p>      <p>Garcia-Alonso et al., 2008 (13) avaliaram o consumo do extrato de vinho tinto,  com alto teor de antocianinas, nos n&iacute;veis plasm&aacute;ticos de MCP-1 de indiv&iacute;duos  saud&aacute;veis. A caracteriza&ccedil;&atilde;o do extrato por HPLC evidenciou a presen&ccedil;a de 71,2%  de  antocianidinas  monoglicosiladas  do  total  de  antocianidinas,  representadas em  ordem  decrescente,  pela  malvidina-3-glicos&iacute;deo,  delfinidina-3-glicos&iacute;deo, petunidina-3-glicos&iacute;deo,  peonidina-3-glicos&iacute;deo  e  cianidina-3-glicos&iacute;deo.  Sete  indiv&iacute;duos (dois homens e cinco mulheres), com idade m&eacute;dia de 31 anos e &iacute;ndice  de massa corporal m&eacute;dio de 23,2 receberam oralmente, ap&oacute;s jejum de 12 horas,  uma dose &uacute;nica de 12 g do extrato rico em antocianinas. A dosagem de MCP-1  foi realizada as 0, 3, 6, 10 e 24 h ap&oacute;s a ingest&atilde;o do extrato. Por&eacute;m, apenas 3 horas  ap&oacute;s a ingest&atilde;o do extrato foi encontrado uma redu&ccedil;&atilde;o significativa de MCP-1  no  plasma  e  ap&oacute;s  24  horas  os  n&iacute;veis  de  MCP-1  voltaram  ao  normal.  Esse  fato  pode ser decorrente do extrato ter sido administrado aos participantes do estudo  em  uma  &uacute;nica  dose  e  seria  interessante  a  avalia&ccedil;&atilde;o  da  ingest&atilde;o  do  extrato  rico  em antocianinas por um per&iacute;odo maior. Os resultados deste trabalho sugeriram  fortes evid&ecirc;ncias de que as antocianinas podem interferir na produ&ccedil;&atilde;o da quimiocina MCP-1, e conseq&uuml;entemente, reduzir processos inflamat&oacute;rios.</p>       <p>c)    Inibi&ccedil;&atilde;o  da  resposta  inflamat&oacute;ria  e  a  apoptose  de  c&eacute;lulas  endoteliais  humanas  induzidas pelo fator CD40.  O fator imune CD40 e seu ligante (CD40L) s&atilde;o um dos mediadores do processo  inflamat&oacute;rio, e est&atilde;o sendo considerados como potentes ativadores da patog&ecirc;nese  da aterosclerose. O CD40 e CD40L s&atilde;o membros do fator de necrose tumoral (TNF) e da fam&iacute;lia de receptores de TNF (TNFR) e s&atilde;o expressos pela intera&ccedil;&atilde;o de c&eacute;lulas imunes como os linf&oacute;citos T e B e tamb&eacute;m por c&eacute;lulas n&atilde;o imunes, como as c&eacute;lulas endoteliais vasculares. A liga&ccedil;&atilde;o do CD40 com seu ligante CD40L  induz  a  produ&ccedil;&atilde;o  de  v&aacute;rias  citocinas  e  quimiocinas  inflamat&oacute;rias,  tais como  as  interleucinas  e  MCP-1,  respectivamente,  al&eacute;m  das  mol&eacute;culas  de  ades&atilde;o, como a VCAM-1 (mol&eacute;cula-1 de ades&atilde;o vascular) e ICAM-1 (mol&eacute;cula-1 de  ades&atilde;o  intercelular).  Esta  intera&ccedil;&atilde;o  tamb&eacute;m  parece  desempenhar  um  papel importante no desenvolvimento da ruptura da placa ateroscler&oacute;tica e na regula&ccedil;&atilde;o da express&atilde;o de metaloproteinases da matriz. VCAM-1 e ICAM-1 s&atilde;o mol&eacute;culas  pr&oacute;-inflamat&oacute;rias  que  atraem  linf&oacute;citos  T  e  macr&oacute;fagos  para  o  ateroma,  promovendo  a  inicia&ccedil;&atilde;o  e  a  progress&atilde;o  da  les&atilde;o  ateroscler&oacute;tica.  As  metaloproteinases da matriz s&atilde;o capazes de degradar componentes da matriz extracelular nos vasos sangu&iacute;neos e aumentar a vulnerabilidade das placas ateroscler&oacute;ticas &agrave;  ruptura com conseq&uuml;ente forma&ccedil;&atilde;o de trombos (51).</p>      <p> O tratamento com as antocianinas cianidina-3-glicos&iacute;deo e peonidina-3-glicos&iacute;deo  (1,  10  e  100  &micro;M)  por  24  horas  em  cultura  de  c&eacute;lulas  endoteliais  humanas da veia umbilical atenuou a resposta inflamat&oacute;ria e a apoptose destas c&eacute;lulas induzidas por CD40, por reduzir a secre&ccedil;&atilde;o de mol&eacute;culas de ades&atilde;o (VCAM-1 e ICAM-1), reduzir a produ&ccedil;&atilde;o e atividade de metaloproteinases de matriz e suprimir a ativa&ccedil;&atilde;o de JNK e p38 induzida por CD40. Os autores mostraram que a ativa&ccedil;&atilde;o de p38 &eacute; um dos mecanismos chaves pelo qual o CD40 induz a resposta inflamat&oacute;ria e que a estimula&ccedil;&atilde;o de JNK &eacute; necess&aacute;ria para promover a apoptose das c&eacute;lulas endoteliais estimuladas por CD40 (14).</p>       <p>d)    Inibi&ccedil;&atilde;o da produ&ccedil;&atilde;o de &oacute;xido n&iacute;trico e a express&atilde;o de iNOS (&oacute;xido n&iacute;trico sintase induzida) em c&eacute;lulas de animais. </p>      ]]></body>
<body><![CDATA[<p> A iNOS (&oacute;xido n&iacute;trico sintase induzida) &eacute; a enzima respons&aacute;vel pela produ&ccedil;&atilde;o de  &oacute;xido n&iacute;trico em diferentes c&eacute;lulas, como macr&oacute;fagos, c&eacute;lulas endoteliais e hepat&oacute;citos, ap&oacute;s ativa&ccedil;&atilde;o com lipopolissacar&iacute;deos e citocinas. A utiliza&ccedil;&atilde;o de agentes que inibem a atividade e/ou a indu&ccedil;&atilde;o da iNOS pode ser &uacute;til como ferramenta terap&ecirc;utica na redu&ccedil;&atilde;o de processos inflamat&oacute;rios em diferentes tecidos (43).</p>      <p> Matheus  et  al.,  2006  (43),  evidenciaram  efeito  inibit&oacute;rio  de  <i>Euterpe  oleracea</i>  (a&ccedil;a&iacute;)  na  produ&ccedil;&atilde;o  do  &oacute;xido  n&iacute;trico  e  na  express&atilde;o  da  iNOS.  Neste  trabalho  foram  investigados  os  efeitos  de  extratos  etan&oacute;lico,  de  acetato  de  etila  e  butan&oacute;lico obtido a partir de flores, frutos e casca do caule de <i>Euterpe oleracea</i> em cultura  de  c&eacute;lulas  de  mon&oacute;citos  e  macr&oacute;fagos  de  camundongos  (RAW  264,7)  estimuladas  com  lipopolissacar&iacute;deos  e  citocinas.  As  antocianinas  predominantes nos extratos foram cianidina-3-glicos&iacute;deo e cianidina-3-raminos&iacute;deo, sendo encontradas em maiores concentra&ccedil;&otilde;es no extrato etan&oacute;lico dos frutos de <i>E. oleracea</i>. Os resultados mostraram que o extrato etan&oacute;lico obtido a partir dos frutos foi o mais potente em inibir a produ&ccedil;&atilde;o de &oacute;xido n&iacute;trico e a express&atilde;o da iNOS, provavelmente devido seu maior conte&uacute;do de antocianinas que as outras fra&ccedil;&otilde;es.  A redu&ccedil;&atilde;o da viabilidade celular foi encontrada apenas em altas doses dos extratos (acima de 500 &micro;g/mL).</p>      <p><b>Processo de forma&ccedil;&atilde;o da aterosclerose</b></p>      <p>As doen&ccedil;as cardiovasculares s&atilde;o as principais causas de morbidade e mortalidade no  mundo ocidental, sendo suas principais manifesta&ccedil;&otilde;es decorrentes dos eventos cl&iacute;nicos  da aterosclerose, como o infarto, as embolias e os acidentes vasculares cerebrais (18).</p>      <p>A aterosclerose &eacute; caracterizada como uma doen&ccedil;a inflamat&oacute;ria cr&ocirc;nica de origem multifatorial que ocorre em resposta &agrave; agress&atilde;o endotelial, acometendo principalmente a camada &iacute;ntima de art&eacute;rias de m&eacute;dio e grande calibre (19).</p>      <p>A disfun&ccedil;&atilde;o endotelial &eacute; considerada o fator inicial para a forma&ccedil;&atilde;o das placas ateroscler&oacute;ticas e caracteriza-se por uma resposta inflamat&oacute;ria &agrave; inj&uacute;ria da parede vascular. Um conjunto de rea&ccedil;&otilde;es celulares e moleculares a diversos agressores, dentre eles o excesso de radicais livres, a eleva&ccedil;&atilde;o das part&iacute;culas de lipoprote&iacute;na de baixa densidade (LDL) no plasma e a presen&ccedil;a de LDL oxidada (LDLox) no interior da c&eacute;lula endotelial s&atilde;o respons&aacute;veis pelo comprometimento do endot&eacute;lio (20, 21).</p>      <p>A oxida&ccedil;&atilde;o da LDL ocorre principalmente na &iacute;ntima da art&eacute;ria (21).  As esp&eacute;cies reativas de oxig&ecirc;nio (EROs) e as esp&eacute;cies reativas de nitrog&ecirc;nio (ERNs) s&atilde;o as principais respons&aacute;veis por esta. As EROs incluem o &acirc;nion super&oacute;xido (O <sub>2</sub><sup>-</sup> ), o radical hidroxil (OH)  e  o  per&oacute;xido  de  hidrog&ecirc;nio  (H<sub>2</sub>O<sub>2</sub>),  sendo  os  representantes  principais  das ERNs o &oacute;xido n&iacute;trico (NO <sup>-</sup>) e o peroxinitrito (ONO<sub>2</sub><sup>-</sup>) (22).</p>      <p>As  part&iacute;culas  de  LDL  difundem-se  passivamente  pelas  c&eacute;lulas  endoteliais  por  transporte vesicular, podendo aderir &agrave; parede do vaso por intera&ccedil;&otilde;es entre a apoprote&iacute;na B e os proteoglicanos da matriz subebdotelial (19).</p>      <p>A LDLox estimula a camada de c&eacute;lulas endoteliais a produzir mol&eacute;culas de ades&atilde;o celular como VCAM-1 (mol&eacute;cula-1 de ades&atilde;o vascular), ICAM-1 (mol&eacute;cula-1 de ades&atilde;o intercelular), fatores de crescimento, como o M-CSF (fator estimulador de col&ocirc;nia de  macr&oacute;fagos)  e  prote&iacute;nas  quimiot&aacute;ticas,  como  MCP-1  (prote&iacute;na-1  quimiot&aacute;tica  para mon&oacute;citos), resultando na ades&atilde;o e no recrutamento de mon&oacute;citos e linf&oacute;citos circulantes para dentro do vaso. Os mon&oacute;citos migram para o espa&ccedil;o subendotelial onde se diferenciam em macr&oacute;fagos, que por sua vez captam as LDL-ox, pela a&ccedil;&atilde;o dos seus receptores seq&uuml;estradores (19).</p>      <p>Dentro dos macr&oacute;fagos, a LDLox &eacute; degradada e o colesterol livre &eacute; esterificado, resultando em um grande ac&uacute;mulo de colesterol e a forma&ccedil;&atilde;o de c&eacute;lulas espumosas, originando a primeira les&atilde;o da aterosclerose: a estria gordurosa (23). </p>       ]]></body>
<body><![CDATA[<p>Posteriormente,  as  c&eacute;lulas  musculares  lisas  come&ccedil;am  a  migrar  da  camada  m&eacute;dia  da parede arterial para a &iacute;ntima ou espa&ccedil;o subendotelial, proliferam e secretam col&aacute;geno, dando origem &agrave; les&atilde;o intermedi&aacute;ria. Nesta fase, o espessamento da &iacute;ntima provoca o remodelamento, ou seja, uma dilata&ccedil;&atilde;o da art&eacute;ria, compensat&oacute;ria ao estreitamento do l&uacute;men. Mais uma vez, sob o est&iacute;mulo da LDLox, as c&eacute;lulas do sistema imune local liberam enzimas, citocinas e fatores de crescimento capazes de induzir necrose local. Ciclos  repetidos de ac&uacute;mulo e ativa&ccedil;&atilde;o de c&eacute;lulas mononucleares, migra&ccedil;&atilde;o e prolifera&ccedil;&atilde;o das c&eacute;lulas musculares lisas com produ&ccedil;&atilde;o de col&aacute;geno, levam ao aumento progressivo da les&atilde;o, at&eacute; que se estruture uma capa fibrosa ao redor de um n&uacute;cleo lip&iacute;dico e de tecido necr&oacute;tico, a chamada les&atilde;o avan&ccedil;ada (24).</p>      <p>Como exposto, a LDLox participa de todas as etapas do processo de desenvolvimento da aterosclerose, desde a disfun&ccedil;&atilde;o endotelial at&eacute; a evolu&ccedil;&atilde;o final do processo ateroscler&oacute;tico, com oclus&atilde;o total do l&uacute;men do vaso (21). Al&eacute;m dos seus efeitos biol&oacute;gicos  citados, produtos derivados da LDLox s&atilde;o citot&oacute;xicos, podendo promover a apoptose celular. Outras contribui&ccedil;&otilde;es da LDLox para o processo inflamat&oacute;rio na aterosclerose s&atilde;o a inibi&ccedil;&atilde;o da produ&ccedil;&atilde;o de &oacute;xido n&iacute;trico, que &eacute; um vasodilatador, o est&iacute;mulo da produ&ccedil;&atilde;o de citocinas, como a interleucina-1, e o aumento da agrega&ccedil;&atilde;o plaquet&aacute;ria (22).</p>      <p>Dentre  os  mecanismos  regulat&oacute;rios  da  resposta  inflamat&oacute;ria,  a  via  do  fator  nuclear kappa B (NF-&kappa;B) representa uma via crucial no controle da transcri&ccedil;&atilde;o de v&aacute;rios genes pr&oacute;-inflamat&oacute;rios, cujo envolvimento na patog&ecirc;nese da aterosclerose tem sido documentado, a libera&ccedil;&atilde;o de prote&iacute;nas de fase aguda, como citocinas, quimiocinas, mol&eacute;culas de ades&atilde;o e reguladores da apoptose e da prolifera&ccedil;&atilde;o celular (25). A indu&ccedil;&atilde;o &agrave; inflama&ccedil;&atilde;o promovida pela LDLox  parece ser decorrente da ativa&ccedil;&atilde;o dessa via pelos seus fosfolip&iacute;dios oxidados, como a lisolecitina e o &aacute;cido lisofosfat&iacute;dico (26).</p>      <p><b>Antocianina no tratamento da les&atilde;o ateroscler&oacute;tica</b></p>      <p>Na busca da elucida&ccedil;&atilde;o de poss&iacute;veis mecanismos de a&ccedil;&atilde;o das antocianinas sobre o processo ateroscler&oacute;tico algumas pesquisas foram realizadas, dando enfoque mais espec&iacute;fico. Podemos citar os trabalhos de Xia et al., 2006 (14), Mauray et al., 2009 (28) e  Miyazaki et al., 2008 (29) que analisaram os efeitos de extratos com alto teor de antocianinas  em  camundongos  com  aterosclerose:  o  extrato  de  arroz  preto,  de  uvas  e  de batata doce roxa, respectivamente.</p>      <p>Xia et al., 2006 (14) investigaram a influ&ecirc;ncia de dietas suplementadas com extrato de arroz preto com alto teor antocianina (300 mg/Kg/dia) e com sinvastatina (50 mg/Kg/dia)  na  vulnerabilidade  de  placas  ateroscler&oacute;ticas  avan&ccedil;adas  em  camundongos deficientes  na  apoprote&iacute;na  E.  Ap&oacute;s  20  semanas  de  interven&ccedil;&atilde;o,  o  tamanho  da  placa ateroscler&oacute;tica  foi  reduzido  em  18%  e  13%  nos  grupos  de  animais  que  receberam  o extrato e a sinvastatina, respectivamente.  Em ambos os grupos houve redu&ccedil;&atilde;o da freq&uuml;&ecirc;ncia de n&uacute;cleos necr&oacute;ticos grandes, da espessura da c&aacute;psula fibrosa e um aumento no  conte&uacute;do  de  col&aacute;geno  1,  comparado  ao  grupo  controle.  Sabe-se  que  o  aumento no conte&uacute;do de col&aacute;geno &eacute; importante, pois contribui para a estabiliza&ccedil;&atilde;o das placas ateroscler&oacute;ticas. Nos grupos que receberam o extrato e a sinvastatina tamb&eacute;m houve decr&eacute;scimo da express&atilde;o da iNOS (&oacute;xido n&iacute;trico sintase reduzida) e do fator tecidual, que s&atilde;o importantes fatores pr&oacute;-inflamat&oacute;rios durante o desenvolvimento e progress&atilde;o das les&otilde;es ateroscler&oacute;ticas. Em adi&ccedil;&atilde;o, a suplementa&ccedil;&atilde;o na dieta com o extrato de arroz preto melhorou o perfil lip&iacute;dico plasm&aacute;ticos dos camundongos, diminuindo os triglicer&iacute;deos, colesterol total e a fra&ccedil;&atilde;o n&atilde;o HDL, por&eacute;m, tamb&eacute;m reduziu a fra&ccedil;&atilde;o HDL, comparado com o grupo controle. Comparado com o grupo do extrato, o grupo que recebeu sinvastatina apresentou n&iacute;veis maiores de triglicer&iacute;deos e menores de HDL. Os autores atribu&iacute;ram esses resultados ben&eacute;ficos do extrato ao seu alto conte&uacute;do de antocianinas. Atrav&eacute;s de cromatografia l&iacute;quida de alta efici&ecirc;ncia (CLAE), foram identifdas duas antocianinas majorit&aacute;rias, a cianidina-3-glicos&iacute;deo e peonidina-3-glicos&iacute;deo, que representaram 43,2% do total de compostos presentes no extrato.</p>      <p>Mauray  et  al.,  2009  (28)  observaram  efeito  antiaterog&ecirc;nico  da  suplementa&ccedil;&atilde;o  na dieta  (0,02%)  por  16  semanas  com  dois  extratos  ricos  em  antocianinas  extra&iacute;dos  de uvas fermentadas e n&atilde;o fermentadas, em camundongos deficientes na apoprote&iacute;na E.  A suplementa&ccedil;&atilde;o na dieta com os extratos de uva n&atilde;o fermentada e fermentada reduziu as les&otilde;es ateroscler&oacute;ticas em 15% e 36%, respectivamente. O melhor resultado foi observado  com  o  extrato  de  uvas  fermentadas,  sugerindo  que  a  fermenta&ccedil;&atilde;o  gerou  novos compostos bioativos mais eficientes na atenua&ccedil;&atilde;o da progress&atilde;o da aterosclerose. Entretanto,  n&atilde;o  foram  observadas  altera&ccedil;&otilde;es  na  capacidade  antioxidante  no  plasma, determinada pelas t&eacute;cnicas de capacidade de absor&ccedil;&atilde;o do radical oxig&ecirc;nio (ORAC), peroxida&ccedil;&atilde;o lip&iacute;dica hep&aacute;tica e perfil lip&iacute;dico (colesterol total e triglicer&iacute;deos) plasm&aacute;tico e no f&iacute;gado dos animais.  Miyazaki  et  al.,  2008  (29)  avaliaram  o  potencial  antiaterog&ecirc;nico  de  antocianinas  da batata doce roxa adicionadas por 4 semanas na dieta (1%) de camundongos deficientes na apoprote&iacute;na E com 6 semanas de idade, alimentados com dieta enriquecida de colesterol e gorduras. In vitro, estas antocianinas foram capazes de aumentar a resist&ecirc;ncia da LDL &agrave; oxida&ccedil;&atilde;o, comparado ao &aacute;cido L-asc&oacute;rbico. Comparado ao grupo controle, os animais que receberam a dieta suplementada com antocianinas da batata doce roxa apresentaram  uma  redu&ccedil;&atilde;o  nas  les&otilde;es  ateroscler&oacute;ticas  (45%),  nos  n&iacute;veis  de  TBARS (subst&acirc;ncias que reagem com o &aacute;cido tiobarbit&uacute;rico) no f&iacute;gado e nos n&iacute;veis plasm&aacute;ticos de VCAM-1 (mol&eacute;cula-1 de ades&atilde;o da c&eacute;lula vascular). Entretanto, n&atilde;o foi observado  efeito significativo no perfil lip&iacute;dico no plasma e no f&iacute;gado destes animais.</p>      <p>A constata&ccedil;&atilde;o destes diferentes estudos nos estimula &agrave; continua&ccedil;&atilde;o das interpreta&ccedil;&otilde;es,  principalmente com o objetivo de buscar novos mecanismos de a&ccedil;&atilde;o que possa fortalecer o envolvimento das antocianinas na redu&ccedil;&atilde;o do processo ateroscler&oacute;tico.</p>       <p><b><font size="3">CONCLUS&Atilde;O </font></b></p>      <p>As antocianinas possuem grande potencial em reduzir o risco de desenvolvimento da aterosclerose. Os mecanismos envolvidos neste processo s&atilde;o, principalmente, referentes  &agrave;s  atividades  antioxidantes  das  antocianinas  e  a  capacidade  destes  compostos  em reduzir fatores pr&oacute;-inflamat&oacute;rios. Ainda h&aacute; lacunas sobre a dose de antocianinas necess&aacute;ria para exercer estes efeitos. Ademais, &eacute; necess&aacute;rio ter cautela com a suplementa&ccedil;&atilde;o desses compostos, visto que essa n&atilde;o foi analisada por longos per&iacute;odos de tempo em humanos. A ingest&atilde;o de altas doses de subst&acirc;ncias antioxidantes pode exercer efeitos pr&oacute;-oxidantes delet&eacute;rios, principalmente se utilizados por longos per&iacute;odos.</p> <hr>      ]]></body>
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