<?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>1517-8692</journal-id>
<journal-title><![CDATA[Revista Brasileira de Medicina do Esporte]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Bras Med Esporte]]></abbrev-journal-title>
<issn>1517-8692</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Brasileira de Medicina do Exercício e do Esporte]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1517-86922012000300015</article-id>
<article-id pub-id-type="doi">10.1590/S1517-86922012000300015</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Efeito do exercício no sistema imune: resposta, adaptação e sinalização celular]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of exercise on immune system: response, adaptation and cell signaling]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terra]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Sílvia Amaral Gonçalves da]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinto]]></surname>
<given-names><![CDATA[Verônica Salerno]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dutra]]></surname>
<given-names><![CDATA[Patrícia Maria Lourenço]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UERJ Faculdade de Ciências Médicas Departamento de Microbiologia, Imunologia e Parasitologia]]></institution>
<addr-line><![CDATA[Rio de Janeiro RJ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,UERJ Faculdade de Ciências Médicas Departamento de Microbiologia, Imunologia e Parasitologia]]></institution>
<addr-line><![CDATA[Rio de Janeiro RJ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,UERJ Escola de Educação Física e Desporto Departamento de Biociências da Atividade Física]]></institution>
<addr-line><![CDATA[Rio de Janeiro RJ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,UFRJ EEFD Programa de Pós-Graduação em Biodinâmica do Movimento]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>18</volume>
<numero>3</numero>
<fpage>208</fpage>
<lpage>214</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S1517-86922012000300015&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_abstract&amp;pid=S1517-86922012000300015&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_pdf&amp;pid=S1517-86922012000300015&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[INTRODUÇÃO: Durante o último século, o homem tornou-se menos ativo fisicamente, adotando hábitos cada vez mais sedentários. Isto promoveu aumento na incidência de doenças crônicas tais como doenças cardiovasculares, diabetes do tipo 2 e síndrome metabólica. A prática de atividade física pode influenciar o estado de higidez alterando estados metabólicos e também o sistema imunológico. OBJETIVO: Revisar na literatura estudos que abordem os efeitos promovidos pelo exercício físico no desenvolvimento da resposta imunológica e suas possíveis vias de transdução de sinais. MÉTODOS: Foram consultadas as bases de dados SciELO e PubMed. RESULTADOS: A literatura disponível mostra que durante a prática de exercício, várias subpopulações de leucócitos são alteradas de acordo com a intensidade e duração da atividade desempenhada. Exercícios de intensidade moderada estimulam uma resposta pró-inflamatória, enquanto aqueles de alta intensidade tendem a promover respostas anti-inflamatórias visando diminuir os danos na musculatura esquelética. Tais alterações são vistas em células apresentadoras de antígeno (como macrófagos e células dendríticas), neutrófilos, células natural killers (NK) e em moléculas de superfície como os receptores do tipo Toll (TLR) e do complexo principal de histocompatibilidade de classe II (MHC II), além das modificações promovidas em todo o repertório de citocinas. CONCLUSÃO: O estado atual do conhecimento permite considerar que as alterações no sistema imune são dependentes dos parâmetros inerentes ao exercício e que para que todas estas alterações ocorram, algumas cascatas de sinalização celular são acionadas, dando origem a um complexo processo de fosforilação/desfosforilação que culmina em ativação de fatores de transcrição, tradução de RNAm, síntese proteica e proliferação celular.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[INTRODUCTION: Over the last century, people have become less active, adopting more sedentary habits. This scenario has increased the incidence of chronic diseases such as cardiovascular diseases, type 2 diabetes and metabolic syndrome. The practice of physical activities can influence healthiness by altering the metabolic state and also the immune system. OBJECTIVE: To review the literature for studies that address the effects promoted by physical exercise on the development of immune responses and the possible signal transduction pathways. METHODS: The SciELO and PubMed data bases were consulted. RESULTS: The available literature shows that during the practice of exercise, various subpopulations of leukocytes are altered in accordance with the intensity and duration of the activity performed. Exercise of moderate intensity stimulates a pro-inflammatory response, while those of high intensity tend to promote anti-inflammatory responses with the purpose to decrease damage to skeletal muscle. Such alterations are observed in cells that present antigens (such as macrophages and dendritic cells), neutrophils, natural killer cells (NK) and in surface molecules like Toll-like receptors (TLR) and major histocompatibility complex class II, as well as the entire repertoire of cytokines. CONCLUSION: The current state of knowledge suggests that the alterations in the immune system are dependent on parameters inherent to exercise and that in order to have all these alterations occurring, some cell signaling cascades are activated, giving rise to a complex process of phosphorylation/dephosphorylation that culminates in the activation of transcription factors, translation of mRNA's, protein synthesis and cell proliferation.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[atividade física]]></kwd>
<kwd lng="pt"><![CDATA[citocinas]]></kwd>
<kwd lng="pt"><![CDATA[células efetoras]]></kwd>
<kwd lng="pt"><![CDATA[sinalização celular]]></kwd>
<kwd lng="en"><![CDATA[physical activity]]></kwd>
<kwd lng="en"><![CDATA[cytokines]]></kwd>
<kwd lng="en"><![CDATA[effector cells]]></kwd>
<kwd lng="en"><![CDATA[cell signaling]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"> <font size="2"><b><font face="Verdana, Arial, Helvetica, sans-serif">ARTIGO ORIGINAL    <br>   CI&Ecirc;NCIAS DO EXERC&Iacute;CIO E DO ESPORTE</font></b></font></p>     <p>&nbsp;</p>     <p><b><font size="4" face="Verdana, Arial, Helvetica, sans-serif">Efeito do exerc&iacute;cio no sistema imune: resposta, adapta&ccedil;&atilde;o e sinaliza&ccedil;&atilde;o celular </font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Rodrigo Terra<sup>I,IV</sup>; S&iacute;lvia Amaral Gon&ccedil;alves da Silva<sup>II</sup>; Ver&ocirc;nica Salerno Pinto<sup>III</sup>; Patr&iacute;cia Maria Louren&ccedil;o Dutra<sup>I</sup></font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>I</sup>Laborat&oacute;rio de Imunofisiologia do Exerc&iacute;cio, Departamento   de Microbiologia, Imunologia e Parasitologia, Faculdade de Ci&ecirc;ncias M&eacute;dicas,   UERJ &#150; Rio de Janeiro, RJ<br />   <sup>II</sup>Laborat&oacute;rio de Imunofarmacologia Parasit&aacute;ria,   Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de   Ci&ecirc;ncias M&eacute;dicas, UERJ &#150; Rio de Janeiro, RJ<br />   <sup>III</sup>Laborat&oacute;rio de Bioqu&iacute;mica do Exerc&iacute;cio e Motores   Moleculares, Departamento de Bioci&ecirc;ncias da Atividade F&iacute;sica, Escola de   Educa&ccedil;&atilde;o F&iacute;sica e Desporto, UFRJ &#150; Rio de Janeiro, RJ<br />   <sup>IV</sup>Aluno do Programa de P&oacute;s-Gradua&ccedil;&atilde;o em Biodin&acirc;mica do   Movimento, EEFD, UFRJ</font></p>     <p><font size="2" face="verdana"><a href="#end">Correspond&ecirc;ncia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMO</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODU&Ccedil;&Atilde;O:</b> Durante o &uacute;ltimo s&eacute;culo, o homem tornou-se menos   ativo fisicamente, adotando h&aacute;bitos cada vez mais sedent&aacute;rios. Isto promoveu   aumento na incid&ecirc;ncia de doen&ccedil;as cr&ocirc;nicas tais como doen&ccedil;as cardiovasculares,   diabetes do tipo 2 e s&iacute;ndrome metab&oacute;lica. A pr&aacute;tica de atividade f&iacute;sica pode   influenciar o estado de higidez alterando estados metab&oacute;licos e tamb&eacute;m o   sistema imunol&oacute;gico. <br />   <b>OBJETIVO:</b> Revisar na literatura estudos que abordem os   efeitos promovidos pelo exerc&iacute;cio f&iacute;sico no desenvolvimento da resposta   imunol&oacute;gica e suas poss&iacute;veis vias de transdu&ccedil;&atilde;o de sinais. <br />   <b>M&Eacute;TODOS:</b> Foram   consultadas as bases de dados SciELO e PubMed. <br />   <b>RESULTADOS:</b> A literatura   dispon&iacute;vel mostra que durante a pr&aacute;tica de exerc&iacute;cio, v&aacute;rias subpopula&ccedil;&otilde;es de   leuc&oacute;citos s&atilde;o alteradas de acordo com a intensidade e dura&ccedil;&atilde;o da atividade   desempenhada. Exerc&iacute;cios de intensidade moderada estimulam uma resposta   pr&oacute;-inflamat&oacute;ria, enquanto aqueles de alta intensidade tendem a promover   respostas anti-inflamat&oacute;rias visando diminuir os danos na musculatura   esquel&eacute;tica. Tais altera&ccedil;&otilde;es s&atilde;o vistas em c&eacute;lulas apresentadoras de ant&iacute;geno   (como macr&oacute;fagos e c&eacute;lulas dendr&iacute;ticas), neutr&oacute;filos, c&eacute;lulas <i>natural killers</i> (NK) e em mol&eacute;culas   de superf&iacute;cie como os receptores do tipo <i>Toll </i>(TLR) e do complexo principal de histocompatibilidade de classe II   (MHC II), al&eacute;m das modifica&ccedil;&otilde;es promovidas em todo o repert&oacute;rio de citocinas. <br />   <b>CONCLUS&Atilde;O:</b> O estado atual do conhecimento permite considerar que as altera&ccedil;&otilde;es   no sistema imune s&atilde;o dependentes dos par&acirc;metros inerentes ao exerc&iacute;cio e que   para que todas estas altera&ccedil;&otilde;es ocorram, algumas cascatas de sinaliza&ccedil;&atilde;o   celular s&atilde;o acionadas, dando origem a um complexo processo de   fosforila&ccedil;&atilde;o/desfosforila&ccedil;&atilde;o que culmina em ativa&ccedil;&atilde;o de fatores de transcri&ccedil;&atilde;o,   tradu&ccedil;&atilde;o de RNAm, s&iacute;ntese proteica e prolifera&ccedil;&atilde;o celular.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Palavras-chave:</b> atividade f&iacute;sica, citocinas, c&eacute;lulas efetoras, sinaliza&ccedil;&atilde;o celular.</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODU&Ccedil;&Atilde;O</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Durante o &uacute;ltimo s&eacute;culo, a popula&ccedil;&atilde;o dos pa&iacute;ses desenvolvidos   e em desenvolvimento tornou-se menos ativa fisicamente, seja pela mudan&ccedil;a no   tipo de trabalho, seja por ado&ccedil;&atilde;o de novos h&aacute;bitos cada vez mais sedent&aacute;rios. Esta mudan&ccedil;a tem levado a um pronunciado aumento na   incid&ecirc;ncia de doen&ccedil;as cr&ocirc;nicas, tais como doen&ccedil;as cardiovasculares e diabetes   do tipo 2, assim como tem promovido um aumento na obesidade, em desordens   musculoesquel&eacute;ticas, em doen&ccedil;as pulmonares, em certos tipos de c&acirc;ncer e em   desordens neurol&oacute;gicas. Independente do estado de higidez, o sedentarismo   tamb&eacute;m vem afetando a qualidade e a expectativa de vida dessas popula&ccedil;&otilde;es<sup>1</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As respostas promovidas pelo exerc&iacute;cio, tanto agudamente   quanto em sua cronicidade, afetam diversos componentes do sistema imune. O exerc&iacute;cio   de intensidade moderada pode estimular par&acirc;metros relacionados &agrave; imunidade   celular e assim diminuir o risco de infec&ccedil;&atilde;o, enquanto o exerc&iacute;cio de alta   intensidade pode promover um decr&eacute;scimo destes mesmos par&acirc;metros, aumentando   assim o risco de doen&ccedil;as infecciosas<sup>2-4</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Segundo o Col&eacute;gio Americano de Medicina Esportiva (ACSM)   atividades aer&oacute;bias variando entre 40 e 59% do <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>, 55 e 69% da   frequ&ecirc;ncia card&iacute;aca m&aacute;xima e 12-13 na escala de percep&ccedil;&atilde;o subjetiva de esfor&ccedil;o   de Borg s&atilde;o consideradas de intensidade moderada, enquanto que atividades   aer&oacute;bias variando entre 60 e 84% do <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>, 70 e 89% da frequ&ecirc;ncia   card&iacute;aca m&aacute;xima e 14-16 na escala de percep&ccedil;&atilde;o subjetiva de esfor&ccedil;o de Borg s&atilde;o   consideradas de alta intensidade<sup>5,6</sup>. A Sociedade Internacional de   Exerc&iacute;cio e Imunologia (ISEI), em seu posicionamento oficial, preconiza que a   disfun&ccedil;&atilde;o imune observada ap&oacute;s o exerc&iacute;cio &eacute; mais pronunciada quando o   exerc&iacute;cio &eacute; cont&iacute;nuo, prolongado (&gt; 1,5h) e realizado em intensidade   variando de moderada a alta (55 e 75% do</font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>)<sup>7</sup>. Apesar dessas recomenda&ccedil;&otilde;es,     nem todos os artigos utilizados nesta revis&atilde;o utilizam estes par&acirc;metros para o     controle do exerc&iacute;cio (<img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2</sub>, FC, percep&ccedil;&atilde;o subjetiva de esfor&ccedil;o) e os     indiv&iacute;duos avaliados apresentam uma grande diversidade (atletas, n&atilde;o atletas),     al&eacute;m de muitos estudos serem realizados com animais experimentais. Esses     estudos foram classificados em rela&ccedil;&atilde;o &agrave; intensidade do exerc&iacute;cio (moderado e     intenso) segundo sua descri&ccedil;&atilde;o no artigo original.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O presente estudo tem como objetivo revisar de forma   sistem&aacute;tica os efeitos do exerc&iacute;cio em c&eacute;lulas do sistema imunol&oacute;gico, bem como   nas poss&iacute;veis vias de transdu&ccedil;&atilde;o de sinais que direcionam a resposta imune.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Considera&ccedil;&otilde;es b&aacute;sicas na resposta imune </font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A resposta imunol&oacute;gica pode ser compreendida em duas etapas:   resposta inata e resposta adaptativa. A resposta inata inclui barreiras f&iacute;sicas   (ex.: pele), qu&iacute;micas (ex.: l&aacute;grima, sistema complemento) e a participa&ccedil;&atilde;o de   c&eacute;lulas como macr&oacute;fagos, neutr&oacute;filos, c&eacute;lulas dendr&iacute;ticas, c&eacute;lulas <i>natural killers</i> (NK) e   mol&eacute;culas microbicidas como o &oacute;xido n&iacute;trico (NO) e &acirc;nion super&oacute;xido (O<sub>2</sub><sup>-</sup>).   A resposta imune adaptativa envolve principalmente linf&oacute;citos T (TCD4<sup>+</sup> e TCD8<sup>+</sup>) e B e seus produtos, citocinas e anticorpos,   respectivamente. Pode ser dividida em resposta imune humoral (mediada por   anticorpos) e resposta imune celular (mediada por c&eacute;lulas, tais como linf&oacute;citos   T e macr&oacute;fagos). Os linf&oacute;citos TCD4<sup>+</sup> (auxiliares/<i>helper</i>-Th0) podem se   diferenciar em diversas subpopula&ccedil;&otilde;es dentre as quais destacam-se as c&eacute;lulas   Th1 (T <i>helper</i> tipo 1)   e as c&eacute;lulas Th2 (T <i>helper</i> tipo 2), que produzem padr&otilde;es diferentes de citocinas<sup>8,9</sup>. A   diferencia&ccedil;&atilde;o de linf&oacute;citos TCD4<sup>+</sup> em Th1 pode ser estimulada pela   interleucina 12 (IL-12), produzida por c&eacute;lulas apresentadoras de ant&iacute;genos   (macr&oacute;fagos e c&eacute;lulas dendr&iacute;ticas), enquanto que a diferencia&ccedil;&atilde;o em Th2 &eacute;   induzida por a&ccedil;&atilde;o aut&oacute;crina da IL-4, produzida por TCD4<sup>+</sup>. As c&eacute;lulas   Th1 produzem predominantemente interferon-gama (IFN-&#947;) e est&atilde;o   relacionadas &agrave; resposta imune celular e ao controle de infec&ccedil;&otilde;es causadas por   microrganismos intracelulares. As c&eacute;lulas Th2 produzem principalmente IL-4 e   s&atilde;o correlacionadas com a resposta imune humoral e controle das infec&ccedil;&otilde;es   extracelulares. V&aacute;rios fatores, tais como citocinas predominantes no   microambiente de ativa&ccedil;&atilde;o, mol&eacute;culas co-estimulat&oacute;rias, o tipo de ant&iacute;geno e   eventos precoces que ocorrem durante a resposta imune inata envolvendo as   c&eacute;lulas dendr&iacute;ticas e as c&eacute;lulas NK podem direcionar o tipo de resposta   predominante, determinando assim o controle ou n&atilde;o de uma infec&ccedil;&atilde;o<sup>9,10</sup>.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Citocinas</font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As citocinas s&atilde;o glicoprote&iacute;nas, que, em geral, apresentam   baixo peso molecular (entre 5.000 e 30.000)<sup>11</sup> e desempenham um papel   central na media&ccedil;&atilde;o e regula&ccedil;&atilde;o das respostas   imunol&oacute;gicas<sup>12</sup>. Elas atuam como mensageiras entre as c&eacute;lulas do   sistema imune, hematopoi&eacute;tico e neuroend&oacute;crino<sup>13</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As citocinas t&ecirc;m sido classificadas como pr&oacute; ou   anti-inflamat&oacute;rias, de acordo com as fun&ccedil;&otilde;es desempenhadas. As principais   citocinas anti-inflamat&oacute;rias s&atilde;o IL-10 e TGF-beta (fator de transforma&ccedil;&atilde;o de   crescimento &#946;) as quais podem, entre   outras fun&ccedil;&otilde;es, inibir a produ&ccedil;&atilde;o de citocinas pr&oacute;-inflamat&oacute;rias<sup>14</sup>. Dentre as citocinas   pr&oacute;-inflamat&oacute;rias podemos citar IL-1, IL-2, IL-12, IL-18, IFN-&#947; e TNF-&#945;. Alguns antagonistas competitivos   s&atilde;o ditos anti-inflamat&oacute;rios, tais como o antagonista do receptor de IL-1   (IL-1ra) que impede a liga&ccedil;&atilde;o de IL-1 ao seu receptor<sup>15</sup>. J&aacute; a IL-12,   que &eacute; reconhecidamente uma citocina pr&oacute;-inflamat&oacute;ria<sup>14</sup>, apresenta uma subunidade   chamada p40, que, quando livre, pode inibir a a&ccedil;&atilde;o da IL-12, apresentando   indiretamente uma propriedade anti-inflamat&oacute;ria<sup>16</sup>. A quimiocina, prote&iacute;na quimiot&aacute;tica de mon&oacute;citos   (MCP-1), tamb&eacute;m pode agir indiretamente como anti-inflamat&oacute;ria por inibir a   produ&ccedil;&atilde;o de IL-12<sup>17</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A produ&ccedil;&atilde;o de citocinas anti-inflamat&oacute;rias &eacute; regulada por uma   variedade de fatores<sup>14</sup>.   Catecolaminas e glicocorticoides estimulam a produ&ccedil;&atilde;o de IL-4, IL-10 e IL-13 <i>in vitro</i><sup>18-21</sup>,   assim como prostaglandina E<sub>2</sub> (PGE<sub>2</sub>) tamb&eacute;m aumenta a   produ&ccedil;&atilde;o de IL-10, IL-12p40 e IL-13<sup>22,23</sup>.   J&aacute; <i>in vivo</i>,   catecolaminas promovem um aumento da s&iacute;ntese de IL-10 e IL-1ra<sup>24,25</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A IL-6, tamb&eacute;m conhecida como "citocina gp130", &eacute; uma citocina   que participa do processo inflamat&oacute;rio, sendo considerada uma interleucina   responsiva &agrave; inflama&ccedil;&atilde;o<sup>26</sup>. Entretanto, apresenta a&ccedil;&atilde;o   anti-inflamat&oacute;ria indireta por estimular a s&iacute;ntese de IL-1ra e de IL-10<sup>27,28</sup>. Esta citocina tem sido   denominada miocina, visto que a contra&ccedil;&atilde;o de m&uacute;sculos esquel&eacute;ticos durante   exerc&iacute;cios prolongados libera grandes concentra&ccedil;&otilde;es desta na circula&ccedil;&atilde;o<sup>28-35</sup>.   A IL-8 e IL-15 tamb&eacute;m foram descritas por alguns estudos como miocinas&shy;<sub>&shy;&shy;</sub><sup>28,32,36,37</sup> (<a href="/img/revistas/rbme/v18n3/a15tab01.jpg">tabela 1</a>). </font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Efeito do exerc&iacute;cio f&iacute;sico em c&eacute;lulas do sistema imune</font></b></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Neutr&oacute;filos</font></b></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Neutr&oacute;filos s&atilde;o fag&oacute;citos que desempenham um importante papel   na resposta imune inata, sendo geralmente a primeira c&eacute;lula recrutada para o   s&iacute;tio da infec&ccedil;&atilde;o. Portanto, est&atilde;o envolvidos em diversos processos inflamat&oacute;rios, inclusive o do tecido muscular   promovido pelo exerc&iacute;cio. A sequ&ecirc;ncia de eventos que ocorre na resposta   neutrof&iacute;lica inclui ader&ecirc;ncia, quimiotaxia, fagocitose, <i>burst</i> oxidativo, desgranula&ccedil;&atilde;o   e elimina&ccedil;&atilde;o do microrganismo<sup>38</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Diversos elementos est&atilde;o envolvidos no comportamento dos   neutr&oacute;filos e na resposta imune ao exerc&iacute;cio, influenciando mediadores neuroend&oacute;crinos,   libera&ccedil;&atilde;o de esteroides, produ&ccedil;&atilde;o de citocinas e processos de oxirredu&ccedil;&atilde;o   associados com a produ&ccedil;&atilde;o de radicais livres<sup>39</sup>. A ativa&ccedil;&atilde;o da fibra   muscular aumenta a libera&ccedil;&atilde;o de c&aacute;lcio (Ca<sup>2+</sup>), levando &agrave; s&iacute;ntese de   citocinas pr&oacute;-inflamat&oacute;rias, como o fator de necrose tumoral alfa (TNF-<b>&#945;</b>) e IL-1<b>&#946;</b>, que regulam a express&atilde;o de   selectinas pelas c&eacute;lulas endoteliais, atraindo neutr&oacute;filos para a regi&atilde;o. As   citocinas IL-6 e IL-8, secretadas ap&oacute;s o dano tecidual, estimulam a via de   sinaliza&ccedil;&atilde;o que ativa a NADPH-oxidase culminando com a libera&ccedil;&atilde;o de esp&eacute;cies   reativas de oxig&ecirc;nio<sup>40</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Wolach <i>et al.</i><sup>41</sup> examinaram o efeito do exerc&iacute;cio anaer&oacute;bio (teste de Wingate) e aer&oacute;bio,   realizado a 70-80% do FC<sub>m&aacute;x</sub>, na fun&ccedil;&atilde;o neutrof&iacute;lica em mulheres   judocas e sedent&aacute;rias. Houve um decr&eacute;scimo significativo na quimiotaxia de   neutr&oacute;filos 24h ap&oacute;s exerc&iacute;cio aer&oacute;bio, em ambos os grupos, mas n&atilde;o houve   diferen&ccedil;a na atividade bactericida ou na libera&ccedil;&atilde;o de super&oacute;xido. Os autores   tamb&eacute;m n&atilde;o observaram mudan&ccedil;as significativas na fun&ccedil;&atilde;o neutrof&iacute;lica ap&oacute;s   exerc&iacute;cio anaer&oacute;bio, em ambos os grupos. O decr&eacute;scimo na rede quimiot&aacute;tica,   somente em exerc&iacute;cio aer&oacute;bio, sugeriu que esta &eacute; alterada devido &agrave;   interdepend&ecirc;ncia existente entre volume e intensidade e n&atilde;o somente pela   intensidade em si. Embora o efeito na redu&ccedil;&atilde;o da a&ccedil;&atilde;o quimiot&aacute;tica de neutr&oacute;filos   seja transit&oacute;rio e revertido em 48h ap&oacute;s exerc&iacute;cio, &eacute; poss&iacute;vel gerar uma   "janela de oportunidade" na qual o risco de infec&ccedil;&atilde;o aumentado deve ser   considerado<sup>42</sup>. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O exerc&iacute;cio f&iacute;sico intenso promove desgranula&ccedil;&atilde;o de   neutr&oacute;filos aumentando a concentra&ccedil;&atilde;o de enzimas como a mieloperoxidase (MPO),   que funciona como marcador de migra&ccedil;&atilde;o de neutr&oacute;filos para o m&uacute;sculo e da   desgranula&ccedil;&atilde;o destes no soro<sup>43</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A infiltra&ccedil;&atilde;o de neutr&oacute;filos, em ratos submetidos a cinco   semanas de atividade natat&oacute;ria, foi mais pronunciada em fibras oxidativas   (vermelhas) do que em fibras glicol&iacute;ticas (brancas). N&atilde;o foi observada   diferen&ccedil;a significativa na concentra&ccedil;&atilde;o de marcadores proteicos de a&ccedil;&atilde;o   neutrof&iacute;lica (MPO), em repouso, entre animais treinados e n&atilde;o treinados. Por&eacute;m,   uma &uacute;nica sess&atilde;o de exerc&iacute;cio exaustivo produziu um aumento significativo de   MPO em animais n&atilde;o treinados comparado com o grupo treinado, sugerindo um   poss&iacute;vel efeito protetor do treinamento no tecido muscular<sup>44</sup>.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">C&eacute;lulas apresentadoras de ant&iacute;geno</font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Linf&oacute;citos T reconhecem ant&iacute;genos apenas quando c&eacute;lulas   apresentadoras (c&eacute;lulas dendr&iacute;ticas, macr&oacute;fagos e linf&oacute;citos B) exp&otilde;em   ant&iacute;genos em sua superf&iacute;cie associados a mol&eacute;culas do complexo principal de   histocompatibilidade (MHC &#150; <i>major     histocompatibility complex</i>). Exerc&iacute;cios aer&oacute;bios prolongados e   extenuantes diminuem a express&atilde;o de receptores do tipo <i>Toll</i> (<i>Toll-like receptor &#150;</i> TLRs) em   macr&oacute;fagos e comprometem a apresenta&ccedil;&atilde;o de ant&iacute;genos para os linf&oacute;citos T,   impedindo, sobretudo, a resposta inflamat&oacute;ria Th1. Esse efeito   anti-inflamat&oacute;rio impede o dano tecidual causado pelos mediadores inflamat&oacute;rios   e reduz o risco de doen&ccedil;as inflamat&oacute;rias cr&ocirc;nicas, mas aumenta a   susceptibilidade de infec&ccedil;&otilde;es por microrganismos intracelulares<sup>45</sup>. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Macr&oacute;fagos de camundongos submetidos a treinamento aer&oacute;bio de   intensidade moderada realizado em esteira rolante aumentaram sua capacidade   microbicida e a produ&ccedil;&atilde;o de IFN-<b>&#947;</b>, TNF-<b>&#945;</b> e NO, sendo capazes de   diminuir a infec&ccedil;&atilde;o por <i>Listeria     monocytogenes</i>. Observou-se tamb&eacute;m uma redu&ccedil;&atilde;o na produ&ccedil;&atilde;o de IL-10.   Ainda nestas c&eacute;lulas, o treinamento promoveu uma diminui&ccedil;&atilde;o de receptores <b>&#946;</b>2-adren&eacute;rgicos (<b>&#946;</b>2AR)<sup>46</sup>, assim   como j&aacute; foi visto em linf&oacute;citos ap&oacute;s treinamento de resist&ecirc;ncia<sup>47</sup>. O <b>&#946;</b>2AR &eacute; um membro da   fam&iacute;lia de receptores acoplados &agrave; prote&iacute;na G e funciona como chave de liga&ccedil;&atilde;o   para regula&ccedil;&atilde;o do sistema imune via sistema nervoso simp&aacute;tico<sup>48</sup> e   est&aacute; envolvido com a inibi&ccedil;&atilde;o da enzima NO sintase induzida (iNOS). A diminui&ccedil;&atilde;o desses receptores &eacute; um dos   fatores que contribuem para o aumento da atividade microbicida de macr&oacute;fagos   promovida pelo treinamento moderado<sup>46</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">C&eacute;lulas dendr&iacute;ticas t&ecirc;m a capacidade de internalizar ant&iacute;genos   e expressar um grande n&uacute;mero de mol&eacute;culas co-estimulat&oacute;rias sendo uma   importante c&eacute;lula apresentadora de ant&iacute;genos para as c&eacute;lulas T, estimulando a   sua expans&atilde;o clonal<sup>49</sup>. Chiang <i>et     al.</i><sup>50</sup> observaram em roedores que, ap&oacute;s cinco semanas de   treinamento na esteira com incrementos na velocidade e inclina&ccedil;&atilde;o ao longo das   semanas, houve um aumento no n&uacute;mero de c&eacute;lulas dendr&iacute;ticas, em sua express&atilde;o de   MHC de classe II e produ&ccedil;&atilde;o de IL-12, sugerindo a capacidade de indu&ccedil;&atilde;o de   resposta imune celular.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">C&eacute;lulas NK</font></b></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As c&eacute;lulas NK s&atilde;o linf&oacute;citos com citotoxicidade natural para   c&eacute;lulas infectadas por v&iacute;rus e c&eacute;lulas tumorais, dispensando sensibiliza&ccedil;&atilde;o   prim&aacute;ria e independente de apresenta&ccedil;&atilde;o via MHC. Essas c&eacute;lulas apresentam como   marcadores de superf&iacute;cie o receptor III para regi&atilde;o constante (Fc) de IgG, o   Fcg (CD16) e uma mol&eacute;cula de ades&atilde;o de c&eacute;lulas neuronais (CD56)<sup>51</sup>, respons&aacute;vel por ades&atilde;o   homot&iacute;pica<sup>52</sup>. Baseado na express&atilde;o de CD56, essas c&eacute;lulas podem ser   divididas em duas subpopula&ccedil;&otilde;es: CD56<sup>dim</sup>, as quais apresentam altos   n&iacute;veis de CD16, s&atilde;o mais citot&oacute;xicas e correspondem a 90% das c&eacute;lulas NK   presentes na circula&ccedil;&atilde;o perif&eacute;rica; e CD56<sup>bright</sup>, cujos n&iacute;veis de   CD16 s&atilde;o menores ou inexistentes e correspondem a cerca de 10% do total de   c&eacute;lulas NK circulantes<sup>53,54</sup>.   O fen&oacute;tipo CD56<sup>bright</sup> apresenta a capacidade de produzir uma   variedade de citocinas (principalmente IFN-&#947;   e TNF-&#945;) que est&atilde;o   envolvidas na interface entre a resposta imune inata e adaptativa,   principalmente pela produ&ccedil;&atilde;o de IFN-&#947;   que induz a polariza&ccedil;&atilde;o de TCD4<sup>+</sup> em Th1<sup>53-56</sup>. Uma vez   ativadas, as c&eacute;lulas CD56<sup>bright</sup> tornam-se t&atilde;o citot&oacute;xicas quanto as   da subpopula&ccedil;&atilde;o CD56<sup>dim 57</sup>, sugerindo que as c&eacute;lulas CD56<sup>bright</sup> sejam as precursoras imediatas das CD56<sup>dim 52</sup>. O repert&oacute;rio de   mol&eacute;culas de ades&atilde;o e de receptores de quimiocinas expressos por essas   subpopula&ccedil;&otilde;es &eacute; peculiar, o que ocasiona diferentes s&iacute;tios de migra&ccedil;&atilde;o. CD56<sup>dim</sup> migra preferencialmente para os s&iacute;tios de inflama&ccedil;&atilde;o aguda, enquanto CD56<sup>bright</sup> para os &oacute;rg&atilde;os linfoides secund&aacute;rios<sup>52,58</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As c&eacute;lulas NK apresentam not&aacute;vel sensibilidade ao estresse   promovido pelo exerc&iacute;cio f&iacute;sico, o qual promove sua redistribui&ccedil;&atilde;o do sangue   perif&eacute;rico para os outros tecidos, sugerindo que a NK pode ser um potencial elo   entre a atividade f&iacute;sica regular e o estado de sa&uacute;de geral<sup>59</sup>. A   mobiliza&ccedil;&atilde;o da circula&ccedil;&atilde;o perif&eacute;rica pode ocorrer via mecanismos que incluem   estresse por aumento substancial do fluxo sangu&iacute;neo perif&eacute;rico e express&atilde;o   diminu&iacute;da de mol&eacute;culas de ades&atilde;o induzida por catecolamina<sup>60</sup>, cuja produ&ccedil;&atilde;o &eacute; estimulada   pelo exerc&iacute;cio f&iacute;sico<sup>61</sup>. Entretanto, durante exerc&iacute;cio muito prolongado   (maior que 3h) a concentra&ccedil;&atilde;o de c&eacute;lulas NK circulantes pode retornar ao n&iacute;vel   pr&eacute;-exerc&iacute;cio, ou mesmo tornar-se ainda menor do que este<sup>62</sup>. Uma hip&oacute;tese para essa   diminui&ccedil;&atilde;o seria a migra&ccedil;&atilde;o dessas c&eacute;lulas para s&iacute;tios de inj&uacute;ria muscular<sup>63</sup>. Alguns estudos demonstram que   os dois subgrupos, CD56<sup>bright</sup> e CD56<sup>dim</sup>, aumentam durante   o exerc&iacute;cio; entretanto, existe uma mobiliza&ccedil;&atilde;o diferencial entre eles. A raz&atilde;o   CD56<sup>bright</sup>:CD56<sup>dim</sup> varia entre o per&iacute;odo de repouso,   durante o exerc&iacute;cio e no per&iacute;odo de recupera&ccedil;&atilde;o, sendo menor nos dois primeiros   momentos e aumentando no terceiro. Isso demonstra que este balan&ccedil;o durante a   recupera&ccedil;&atilde;o do estresse fisiol&oacute;gico favorece o subgrupo CD56<sup>bright 64-66</sup>. &Eacute; neste per&iacute;odo que ocorre   a recupera&ccedil;&atilde;o da homeostase e adapta&ccedil;&atilde;o tecidual<sup>67</sup>, sugerindo que este subgrupo pode ter um importante   papel neste processo<sup>59</sup>. Embora as c&eacute;lulas NK CD56<sup>bright</sup> sejam   principalmente encontradas em &oacute;rg&atilde;os linfoides secund&aacute;rios<sup>52,58</sup>,   estas c&eacute;lulas tamb&eacute;m s&atilde;o encontradas em s&iacute;tios inflamat&oacute;rios<sup>58,68</sup>, o   que pode ser explicado por possu&iacute;rem uma grande capacidade de produ&ccedil;&atilde;o de   citocinas e por apresentarem express&atilde;o de mol&eacute;culas de ades&atilde;o, que podem   direcion&aacute;-las ao tecido que sofreu inj&uacute;ria<sup>58</sup>. Al&eacute;m da produ&ccedil;&atilde;o de   citocinas a CD56<sup>bright</sup> libera v&aacute;rios fatores de crescimento   angiog&ecirc;nicos na circula&ccedil;&atilde;o uterina<sup>69</sup>, sugerindo que, somado a outros   fatores, estes podem contribuir para a angiog&ecirc;nese, que &eacute; uma adapta&ccedil;&atilde;o   fisiol&oacute;gica ao exerc&iacute;cio regular<sup>59</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Apesar desses achados, &eacute; necess&aacute;ria uma melhor investiga&ccedil;&atilde;o do   papel das c&eacute;lulas NK associado ao exerc&iacute;cio.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Subpopula&ccedil;&otilde;es de linf&oacute;citos</font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A concentra&ccedil;&atilde;o de todas as subpopula&ccedil;&otilde;es linf&oacute;citos aumenta no   compartimento vascular durante o exerc&iacute;cio e diminui, a n&iacute;veis menores que   aqueles apresentados no per&iacute;odo pr&eacute;-exerc&iacute;cio, ap&oacute;s trabalho f&iacute;sico de longa   dura&ccedil;&atilde;o<sup>70,71</sup>. Durante o exerc&iacute;cio, a raz&atilde;o CD4<sup>+</sup>:CD8<sup>+</sup> diminui, refletindo um maior aumento nas c&eacute;lulas TCD8<sup>+</sup> em rela&ccedil;&atilde;o a   TCD4<sup>+ 26</sup>. Embora a concentra&ccedil;&atilde;o de todas as subpopula&ccedil;&otilde;es   de linf&oacute;citos aumente, a percentagem de c&eacute;lulas TCD4<sup>+</sup> declina pelo   fato de as c&eacute;lulas NK aumentarem mais do que qualquer outra subpopula&ccedil;&atilde;o<sup>26,59</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O decr&eacute;scimo na concentra&ccedil;&atilde;o de linf&oacute;citos no per&iacute;odo   p&oacute;s-exerc&iacute;cio pode ser consequ&ecirc;ncia, pelo menos em parte, de um mecanismo de   apoptose<sup>72</sup>. Um percentual maior de apoptose de linf&oacute;citos em humanos   tem sido descrito imediatamente ap&oacute;s a realiza&ccedil;&atilde;o de exerc&iacute;cios de alta   intensidade<sup>72-74</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O &iacute;ndice de apoptose de linf&oacute;citos quando o exerc&iacute;cio &eacute;   realizado a 38% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub> (6,9 &plusmn; 0,5%) &eacute; semelhante aos n&iacute;veis basais   (6,2 &plusmn; 0,2%) e aumenta significativamente quando a intensidade do exerc&iacute;cio   alcan&ccedil;a 61% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x </sub>(10,4 &plusmn; 0,6%). Um aumento significativo nos   &iacute;ndices de apoptose induzida pelo exerc&iacute;cio &eacute; observado com o incremento   gradual da carga, alcan&ccedil;ando o pico m&aacute;ximo imediatamente ap&oacute;s exerc&iacute;cio   exaustivo (100% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>), atingindo um percentual de apoptose de 22,4   &plusmn; 0,4%. Ap&oacute;s 20 minutos de recupera&ccedil;&atilde;o, o &iacute;ndice apopt&oacute;tico &eacute;   significativamente menor, caindo ainda mais ap&oacute;s 40 min, e chegando aos n&iacute;veis   basais ap&oacute;s 60 min p&oacute;s-exercicio<sup>72</sup>.   O exerc&iacute;cio intenso tamb&eacute;m &eacute; capaz de diminuir a concentra&ccedil;&atilde;o de glutationa   (GSH) de linf&oacute;citos, induzindo o estresse oxidativo, enquanto o conte&uacute;do de   caspases 8, 9 e 3 ativas e a fragmenta&ccedil;&atilde;o de DNA parecem ser aumentados<sup>75</sup>.   Alguns autores tendem a associar o exerc&iacute;cio intenso &agrave; apoptose devido &agrave; a&ccedil;&atilde;o   dos altos n&iacute;veis de catecolaminas produzidos<sup>72</sup>, enquanto outros   associam ao aumento do estresse oxidativo<sup>75,76</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Kruger <i>et al.</i><sup>77</sup> mostraram que a redistribui&ccedil;&atilde;o de leuc&oacute;citos, mecanismo fundamental de   regula&ccedil;&atilde;o da hematopoiese, est&aacute; ativa durante a altera&ccedil;&atilde;o na concentra&ccedil;&atilde;o de   linf&oacute;citos promovida pelo exerc&iacute;cio. O aumento de catecolaminas promovido pelo   exerc&iacute;cio pode estar associado a essa redistribui&ccedil;&atilde;o, uma vez que os linf&oacute;citos   apresentam receptores <b>&#945;</b> e <b>&#946;</b> adren&eacute;rgicos,   sugerindo assim uma regula&ccedil;&atilde;o neurohormonal.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Linf&oacute;citos   T <i>helper </i>(Th)</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Os linf&oacute;citos TCD4<sup>+</sup> virgens expressam a mol&eacute;cula   co-estimulat&oacute;ria CD28 em sua superf&iacute;cie que interage com seu ligante, a   mol&eacute;cula B7, na superf&iacute;cie da c&eacute;lula apresentadora de ant&iacute;geno. A liga&ccedil;&atilde;o   CD28-B7 dispara a sinaliza&ccedil;&atilde;o para a s&iacute;ntese de IL-2 e a express&atilde;o de seu   receptor (IL-2R) pela c&eacute;lula T, ocasionando assim a sua prolifera&ccedil;&atilde;o e   diferencia&ccedil;&atilde;o<sup>78,79</sup>. Com o avan&ccedil;o da idade dos indiv&iacute;duos o n&uacute;mero   absoluto de linf&oacute;citos T diminui, assim como a express&atilde;o de mol&eacute;culas CD28 e a   produ&ccedil;&atilde;o de citocinas do padr&atilde;o Th1 (IL-2 e IFN-&#947;), enquanto h&aacute; um aumento   da produ&ccedil;&atilde;o de citocinas do tipo Th2 (IL-4). Esta altera&ccedil;&atilde;o no balan&ccedil;o Th1/Th2   pode contribuir para a vulnerabilidade maior dos idosos a certas infec&ccedil;&otilde;es<sup>80</sup>. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Um estudo feito com 28 idosos mostrou que ap&oacute;s seis meses de   treinamento com exerc&iacute;cio de intensidade moderada o n&uacute;mero absoluto de   linf&oacute;citos TCD4<sup>+</sup> (CD28<sup>+</sup>CD4<sup>+</sup>) aumentou, assim   como o das c&eacute;lulas produtoras de IFN-&#947; (Th1), enquanto as c&eacute;lulas T   produtoras de IL-4 (Th2) n&atilde;o sofreram altera&ccedil;&otilde;es significativas<sup>81</sup>.   Outros estudos corroboram estes dados demonstrando que o n&uacute;mero absoluto de   linf&oacute;citos T e de c&eacute;lulas TCD4<sup>+ 82</sup> e a express&atilde;o de IL-2R   em c&eacute;lulas T<sup>83</sup> aumentou em idosos submetidos a exerc&iacute;cios de   intensidade moderada combinados (resist&ecirc;ncia e for&ccedil;a) ou programa de   treinamento de resist&ecirc;ncia<sup>81</sup>. Assim sendo, esta express&atilde;o aumentada   favoreceria uma resposta do tipo Th1, prevenindo infec&ccedil;&otilde;es principalmente   aquelas causadas por microrganismos intracelulares.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Efeito do exerc&iacute;cio f&iacute;sico na produ&ccedil;&atilde;o de citocinas</font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A produ&ccedil;&atilde;o de citocinas pode ser modulada por uma s&eacute;rie de   est&iacute;mulos, dentre os quais podemos citar estresse hormonal, estresse oxidativo   e exerc&iacute;cio extenuante<sup>15</sup>. O primeiro estudo sugerindo que o   exerc&iacute;cio f&iacute;sico induzia um aumento das concentra&ccedil;&otilde;es plasm&aacute;ticas de citocinas   foi publicado em 1983 e mostrou que o plasma obtido de seres humanos ap&oacute;s a   pr&aacute;tica de exerc&iacute;cio, quando injetado intraperitonialmente em ratos, promovia o   aumento da temperatura retal destes animais<sup>84</sup>. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">V&aacute;rios autores t&ecirc;m relatado um aumento nas concentra&ccedil;&otilde;es   s&eacute;ricas de citocinas anti-inflamat&oacute;rias ap&oacute;s diferentes formas de exerc&iacute;cio. O   aumento de IL-6 foi associado ao exerc&iacute;cio extenuante em um maratonista<sup>85</sup>,   assim como em resposta a outros tipos de exerc&iacute;cios, nos quais foi observado um   aumento de cerca de 100 vezes em sua concentra&ccedil;&atilde;o plasm&aacute;tica<sup>26,28-33</sup>.   O aumento de IL-6 est&aacute; intimamente ligado &agrave; intensidade do exerc&iacute;cio<sup>27,28</sup>, a qual representa   indiretamente a massa muscular envolvida na atividade contr&aacute;til<sup>28</sup>.   Exerc&iacute;cios que envolvam uma massa muscular limitada, como, por exemplo,   m&uacute;sculos das extremidades superiores, podem ser insuficientes para aumentar as   concentra&ccedil;&otilde;es plasm&aacute;ticas de IL-6 acima dos n&iacute;veis pr&eacute;-exerc&iacute;cio. Por outro   lado, a corrida, que envolve uma grande quantidade de grupos musculares, &eacute; a   modalidade de exerc&iacute;cio em que observou-se o mais pronunciado aumento de IL-6<sup>28</sup>.   O pico dos n&iacute;veis s&eacute;ricos desta citocina &eacute; alcan&ccedil;ado no final da realiza&ccedil;&atilde;o do   exerc&iacute;cio ou em um curto per&iacute;odo ap&oacute;s este, seguido por um r&aacute;pido decr&eacute;scimo   voltando para os n&iacute;veis do per&iacute;odo pr&eacute;-exerc&iacute;cio<sup>35</sup>. Deste modo, a   combina&ccedil;&atilde;o entre a modalidade, a intensidade e a dura&ccedil;&atilde;o da atividade f&iacute;sica   determinam a magnitude do aumento da concentra&ccedil;&atilde;o plasm&aacute;tica de IL-6 induzido   pelo exerc&iacute;cio<sup>28</sup>. Al&eacute;m de seu efeito imunomodulador, esta miocina   tamb&eacute;m apresenta importantes efeitos metab&oacute;licos, tais como o aumento da   capta&ccedil;&atilde;o de glicose e da oxida&ccedil;&atilde;o de &aacute;cidos graxos pelo m&uacute;sculo esquel&eacute;tico,   aumento da gliconeog&ecirc;nese hep&aacute;tica e lip&oacute;lise no tecido adiposo (<a href="#fig01">figura 1</a>). Na   mesma linha, a miocina IL-8 parece exercer efeitos angiog&ecirc;nicos<sup>28,36,37</sup> e a IL-15, tamb&eacute;m produzida pela contra&ccedil;&atilde;o muscular, parece ter efeitos   anab&oacute;licos e na redu&ccedil;&atilde;o da adiposidade<sup>36,37,86</sup>. Apesar de alguns   estudos n&atilde;o mostrarem aumentos significativos na IL-15 plasm&aacute;tica ap&oacute;s o   exerc&iacute;cio<sup>87,88</sup>, Tamura <i>et     al.</i><sup>89</sup> observaram este aumento em indiv&iacute;duos submetidos a   30 minutos de exerc&iacute;cio na esteira com intensidade de 70% da FC<sub>m&aacute;x</sub> predita pela idade (FC<sub>m&aacute;x</sub> = 220 &#150; idade). Os autores atribuem a   falta de consenso na literatura aos diferentes desenhos experimentais e   principalmente aos momentos da medida da IL-15 ap&oacute;s o exerc&iacute;cio.</font></p>     <p><a name="fig01" id="fig01"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbme/v18n3/a15fig01.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O aumento nas concentra&ccedil;&otilde;es de IL-1ra, IL-4, IL-10, IL-12p40 e   MCP-1 foi observado ap&oacute;s a realiza&ccedil;&atilde;o de exerc&iacute;cio m&aacute;ximo<sup>90</sup>,   exerc&iacute;cio de resist&ecirc;ncia<sup>91,92</sup>, corridas do tipo <i>downhill</i><sup>63</sup>, ciclismo intenso<sup>93</sup>,   corridas e ciclismo de resist&ecirc;ncia<sup>92</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Em um estudo realizado envolvendo indiv&iacute;duos do sexo   masculino, corredores e triatletas, foi observado um aumento de 60% na   concentra&ccedil;&atilde;o plasm&aacute;tica de IL-1ra imediatamente ap&oacute;s a realiza&ccedil;&atilde;o de exerc&iacute;cio   de intensidade moderada (EIM) (1h de corrida na esteira, 60% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>),   enquanto que a corrida <i>downhill</i> (CD) (45min &shy;&#91;&#150;10% de gradiente&#93;, 60% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>) promoveu um aumento de   100% nesta concentra&ccedil;&atilde;o e a atividade f&iacute;sica de alta intensidade (EAI) (1h de   corrida na esteira, 85% <img src="/img/revistas/rbme/v18n3/v.jpg" align="absmiddle">O<sub>2m&aacute;x</sub>) promoveu um aumento de 120%. Estes   valores foram ainda maiores ap&oacute;s uma hora do final da atividade f&iacute;sica, sendo   1,3 vezes maiores que a concentra&ccedil;&atilde;o plasm&aacute;tica pr&eacute;-exerc&iacute;co, no caso de EIM,   2,4 vezes maiores, na CD e cinco vezes maiores no EAI. A concentra&ccedil;&atilde;o de IL-10   aumentou apenas imediatamente ap&oacute;s o EAI (6,3 vezes) e uma hora ap&oacute;s esta   atividade (sete vezes), permanecendo inalterada nos dois outros tipos de   treinamento, EIM e CD. Os n&iacute;veis plasm&aacute;ticos de IL-12p40 foram 30% maiores   imediatamente ap&oacute;s a realiza&ccedil;&atilde;o do EAI, enquanto 1h ap&oacute;s a realiza&ccedil;&atilde;o dos tr&ecirc;s   tipos de exerc&iacute;cio, aumentaram apenas 10%, no caso de EIM, 15%, na CD e 25% no EAI<sup>12</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O aumento da produ&ccedil;&atilde;o de citocinas anti-inflamat&oacute;rias durante   o exerc&iacute;cio possivelmente se d&aacute; para restringir rea&ccedil;&otilde;es pr&oacute;-inflamat&oacute;rias em   resposta ao dano na musculatura esquel&eacute;tica causadas pelo exerc&iacute;cio<sup>93</sup>,   podendo ainda inibir a produ&ccedil;&atilde;o de citocinas pr&oacute;-inflamat&oacute;rias associadas ao   desenvolvimento de estados patol&oacute;gicos, tais como diabetes do tipo 2, doen&ccedil;as   cardiovasculares e s&iacute;ndrome metab&oacute;lica<sup>94</sup>. Por outro lado, a produ&ccedil;&atilde;o   de citocinas anti-inflamat&oacute;rias durante o exerc&iacute;cio pode resultar no aumento da   susceptibilidade &agrave; infec&ccedil;&otilde;es<sup>90</sup>. Entretanto, v&aacute;rios trabalhos t&ecirc;m   mostrado que a pr&aacute;tica de exerc&iacute;cios de intensidade moderada induz uma resposta   do tipo Th1, com produ&ccedil;&atilde;o de citocinas pr&oacute;-inflamat&oacute;rias<sup>48,59,81</sup>. Exerc&iacute;cios de   resist&ecirc;ncia de intensidade moderada induzem uma resposta inflamat&oacute;ria sist&ecirc;mica   leve, que &eacute; caracterizada, pelo menos em parte, pela eleva&ccedil;&atilde;o dos n&iacute;veis   s&eacute;ricos de citocinas inflamat&oacute;rias, tais como IL1<b>&#946;</b> e TNF-<b>&#945;</b><sup>95,96</sup>. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Keller <i>et al.</i><sup>97</sup> mostraram que a superexpress&atilde;o de TNF-<b>&#945;</b> retornou &agrave;s concentra&ccedil;&otilde;es normais ap&oacute;s 1h de exerc&iacute;cio natat&oacute;rio agudo em   camundongos cujo gene do receptor de TNF-<b>&#945;</b> (TNFR) foi deletado. Al&eacute;m disso, exerc&iacute;cio cr&ocirc;nico parece suprimir citocinas   pr&oacute;-inflamat&oacute;rias, tais como TNF-<b>&#945;</b> e IL-6, e aumentar citocinas anti-inflamat&oacute;rias incluindo IL-4, IL-10 e TGF-<b>&#946;</b><sup>98,99</sup>.</font></p>     <p><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Efeito do exerc&iacute;cio f&iacute;sico nas vias de sinaliza&ccedil;&atilde;o   envolvidas na resposta imune</font></b></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As intera&ccedil;&otilde;es moleculares que ocorrem na superf&iacute;cie das   c&eacute;lulas, tipo intera&ccedil;&atilde;o ligante-receptor, dispara uma cascata de sinaliza&ccedil;&otilde;es   bioqu&iacute;micas citoplasm&aacute;ticas envolvendo diversas vias de transdu&ccedil;&atilde;o de sinais.   Essas sinaliza&ccedil;&otilde;es podem resultar na produ&ccedil;&atilde;o de prote&iacute;nas, citocinas, express&atilde;o   de receptores e prolifera&ccedil;&atilde;o. Durante a liga&ccedil;&atilde;o ant&iacute;geno/receptor em   linf&oacute;citos, a agrega&ccedil;&atilde;o do receptor de ant&iacute;geno leva &agrave; ativa&ccedil;&atilde;o de prote&iacute;nas   tirosinas cinases associadas aos receptores na por&ccedil;&atilde;o citoplasm&aacute;tica da   membrana celular. Isso inicia a sinaliza&ccedil;&atilde;o intracelular pela fosforila&ccedil;&atilde;o de   res&iacute;duos de tirosina nas caudas dos receptores agregados. Outras tirosinas   cinases do citosol podem ser ativadas e passam a fosforilar novos alvos, at&eacute;   que fatores de transcri&ccedil;&atilde;o sejam ativados e atuem no n&uacute;cleo, induzindo a   transcri&ccedil;&atilde;o de determinados genes<sup>100</sup>. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A sinaliza&ccedil;&atilde;o de IL-6 se assemelha &agrave; de leptina devido ao   receptor de leptina (LRb) e a gp130R<b>&#946;</b> compartilharem um alto grau de homologia em suas sequ&ecirc;ncias e ambos ativarem a   via de sinaliza&ccedil;&atilde;o do complexo formado pela prote&iacute;na cinase ativada por Janus   (JAK)-transdutor de sinal e ativador de transcri&ccedil;&atilde;o (STAT). Quando a IL-6 se   liga ao receptor homodimerizado IL-6R<b>&#945;</b>/gp130R<b>&#946;</b>, resulta em uma cascata de   sinaliza&ccedil;&atilde;o que &eacute; iniciada por autofosforila&ccedil;&atilde;o e ativa&ccedil;&atilde;o de JAK, seguido de   recrutamento de dom&iacute;nio SH2, que cont&eacute;m a prote&iacute;na tirosina fosfatase SHP2, que   leva a ativa&ccedil;&atilde;o da cascata de sinaliza&ccedil;&atilde;o Ras-ERK1/2<sup>28</sup>. A IL-6 pode exercer fun&ccedil;&otilde;es   no sistema imunol&oacute;gico, estimulando a s&iacute;ntese de IL-1ra e de IL-10<sup>27,28</sup>, assim como pode interferir   em v&aacute;rios processos metab&oacute;licos via sinaliza&ccedil;&atilde;o por AMPK e PI3K-AKT<sup>28</sup> (<a href="#fig01">figura 1</a>).</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A prote&iacute;na mTOR (prote&iacute;na alvo de rapamicina em mam&iacute;feros &#150;   droga imunossupressora) &eacute; uma serina/treonina cinase envolvida em v&aacute;rios   processos celulares, os quais incluem metabolismo, crescimento (hipertrofia e   hiperplasia), sobreviv&ecirc;ncia, envelhecimento, plasticidade sin&aacute;ptica e mem&oacute;ria<sup>103</sup>.   A via de sinaliza&ccedil;&atilde;o desta enzima pode ser ativada por: 1) pr&aacute;tica de exerc&iacute;cio   f&iacute;sico; 2) baixos n&iacute;veis de energia na c&eacute;lula, via AMPK (prote&iacute;na cinase   ativada por AMP); 3) fatores de crescimento como insulina e IGF-1; 4)   amino&aacute;cidos, via Rag GTPases; 5) sinais da fam&iacute;lia Wnt via glicog&ecirc;nio sintase   cinase 3 (GSK3)<sup>104</sup>. No sistema imunol&oacute;gico, a sinaliza&ccedil;&atilde;o envolvendo   mTOR &eacute; disparada pela liga&ccedil;&atilde;o de ant&iacute;genos a seus receptores espec&iacute;ficos em   c&eacute;lulas T e B ou &agrave; TLR e pela liga&ccedil;&atilde;o de interleucinas a seus receptores<sup>104,105</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Esta enzima cinase pode apresentar-se na forma de dois   complexos: mTORC1 e mTORC2. A mTOR e a LST8 (tamb&eacute;m chamado G&#946;L),   juntamente com a prote&iacute;na associada reguladora de mTOR (RAPTOR) formam o   complexo mTORC1. RAPTOR &eacute; essencial para a atividade de mTORC1. O complexo   mTORC2 tamb&eacute;m apresenta LST8, mas, ao inv&eacute;s de RAPTOR, est&aacute; associado com RICTOR   (uma estrutura insens&iacute;vel ao imunossupressor rapamicina) e possivelmente a uma   MAPKAP1 (prote&iacute;na cinase ativada por mit&oacute;genos associada &agrave; prote&iacute;na 1, tamb&eacute;m   conhecida como SIN1)<sup>105</sup>.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O complexo mTORC1 estimula a s&iacute;ntese de prote&iacute;na e a   prolifera&ccedil;&atilde;o celular, enquanto o complexo mTORC2, a organiza&ccedil;&atilde;o do   citoesqueleto. O complexo de esclerose tuberosa 1 (TSC1) e 2 (TSC2) juntos   formam um complexo funcional que age como um inibidor de mTORC1. A pr&aacute;tica de   exerc&iacute;cios pode gerar a produ&ccedil;&atilde;o de fatores de crescimento e citocinas, estas   &uacute;ltimas, juntamente com mol&eacute;culas co-estimulat&oacute;rias e receptores de ant&iacute;genos   ativam PI3K, que ativa subsequentemente AKT (PKB). Esta enzima completamente   ativada inibe TSC2 por fosforila&ccedil;&atilde;o da mesma, permitindo a ativa&ccedil;&atilde;o de mTORC1.   Alternativamente, estresse celular e danos no DNA, os quais tamb&eacute;m podem se   promovidos por atividade f&iacute;sica, podem inibir mTORC1 por promover a capacidade   reguladora de TSC1-TSC2. Este complexo age via inibi&ccedil;&atilde;o de RHEB (uma GTPase   hom&oacute;loga a Ras, abundante no c&eacute;rebro), que &eacute; um estimulador de mTORC1 (<a href="#fig02">figura 2</a>)<sup>105</sup>. </font></p>     <p><a name="fig02" id="fig02"></a></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/rbme/v18n3/a15fig02.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A inibi&ccedil;&atilde;o de mTORC1 leva a um efeito pr&oacute;-inflamat&oacute;rio em   c&eacute;lulas fagoc&iacute;ticas, aumentando sua capacidade de produzir citocinas, tais como   IL-6, IL-12 e IL-23 e diminuindo a produ&ccedil;&atilde;o de citocinas anti-inflamat&oacute;rias   como IL-10. Esta inibi&ccedil;&atilde;o ainda &eacute; capaz de estimular respostas do tipo Th1 e   Th17, que s&atilde;o tipicamente inflamat&oacute;rias<sup>106</sup>. A via de mTORC1 pode ser   ativada em fag&oacute;citos em resposta &agrave; infec&ccedil;&atilde;o bacteriana ou ap&oacute;s exposi&ccedil;&atilde;o &agrave;   lipopolissacar&iacute;dios (LPS), ou ainda durante pr&aacute;tica de exerc&iacute;cios f&iacute;sicos<sup>107</sup>.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUS&Atilde;O</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A pr&aacute;tica regular de exerc&iacute;cio f&iacute;sico pode ser ben&eacute;fica para a   sa&uacute;de, por&eacute;m, par&acirc;metros como volume e intensidade devem ser observados em sua   prescri&ccedil;&atilde;o para que dele se obtenha melhores resultados. De uma maneira geral,   o exerc&iacute;cio de intensidade moderada promove prote&ccedil;&atilde;o contra infec&ccedil;&otilde;es causadas   por microrganismos intracelulares, pois direciona a resposta imune para a   predomin&acirc;ncia de c&eacute;lulas Th1. Em contrapartida, atividades de alta intensidade   geram aumento das concentra&ccedil;&otilde;es de citocinas anti-inflamat&oacute;rias (padr&atilde;o Th2),   visando diminui&ccedil;&atilde;o dos danos no tecido muscular resultantes da inflama&ccedil;&atilde;o,   embora isto possa resultar no aumento da susceptibilidade a infec&ccedil;&otilde;es. A <a href="#fig03">figura 3</a> resume os principais efeitos do exerc&iacute;cio f&iacute;sico   no sistema imunol&oacute;gico.</font></p>     <p><a name="fig03" id="fig03"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbme/v18n3/a15fig03.jpg"></p>     <p>&nbsp;</p>     ]]></body>
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FASEB J 2005;1-23.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000296&pid=S1517-8692201200030001500107&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><a name="end"></a><a href="#top"><img src="/img/revistas/rbme/v18n3/seta.jpg" border="0"></a> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Correspond&ecirc;ncia:</b><br />   Ver&ocirc;nica Salerno Pinto    <br>   </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Universidade Federal do Rio de Janeiro - Escola de Educa&ccedil;&atilde;o     F&iacute;sica e Desportos.    <br>   </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Av. Carlos Chagas Filho, 540    ]]></body>
<body><![CDATA[<br>   </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">21941-599 &#150; Cidade Universit&aacute;ria    <br>   </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Rio de Janeiro, RJ.<br />     E-mail: <a href="mailto:vpsalerno@yahoo.com.br">vpsalerno@yahoo.com.br</a></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Todos os autores declararam n&atilde;o haver qualquer potencial conflito   de interesses referente a este artigo.</font></p>      ]]></body><back>
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