<?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>1984-5960</journal-id>
<journal-title><![CDATA[Innovations Implant Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Innov. Implant. J., Biomater. Esthet. (Online)]]></abbrev-journal-title>
<issn>1984-5960</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Experimentos e Pesquisas Odontológicas - INEPO]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1984-59602010000300007</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Revisão sistemática sobre o uso de células-tronco mesenquimais em terapias de perdas ósseas]]></article-title>
<article-title xml:lang="en"><![CDATA[Systematic review of use of mesenchymal stem cells in bone loss therapies]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Silva]]></surname>
<given-names><![CDATA[Igor Iuco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Coutinho]]></surname>
<given-names><![CDATA[Lawrence Andrade Costa da Rocha]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granjeiro]]></surname>
<given-names><![CDATA[José Mauro]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Federal Fluminense Departamento de Biologia Celular e Molecular ]]></institution>
<addr-line><![CDATA[Niterói RJ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Associação Fluminense de Reabilitação  ]]></institution>
<addr-line><![CDATA[Niterói RJ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidade Federal Fluminense Instituto de Biologia Departamento de Biologia Celular e Molecular]]></institution>
<addr-line><![CDATA[Niterói RJ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>5</volume>
<numero>3</numero>
<fpage>29</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_arttext&amp;pid=S1984-59602010000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_abstract&amp;pid=S1984-59602010000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_pdf&amp;pid=S1984-59602010000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Terapias de perdas ósseas com células-tronco mesenquimais sugerem uma promissora perspectiva de uso em cirurgias orais reconstrutivas. O objetivo deste estudo foi realizar um levantamento bibliográfico dos últimos 15 anos com trabalhos experimentais temáticos para traçar um perfil de metodologias e resultados alcançados nesta área. Um destacável crescimento de publicações ocorreu em países economicamente desenvolvidos. A medula óssea se mantém como a principal fonte tecidual de células-tronco mesenquimais (79,31%), caracterizadas por adesão, imunofenotipagem e multipotência, capazes de promover a osteogênese in vitro. Embora exista pluralidade de modelos experimentais in vivo (espécies animais) e clínicos (sítios anatômicos), há prevalência de testes pré-clínicos de terapia celular (27,03%), que indicam boa bicompatibilidade tecidual e osteogênese aumentada pós-enxerto. Estudos clínicos têm relatado resultados positivos para o tratamento de defeitos periodontais, rebordo alveolar deficiente, fenda alveolar congênita, defeitos cranianos extensos, levantamento de seio maxilar e atrofia mandibular pós-irradiação. Os biomateriais carreadores de células mais utilizados foram biocerâmicas a base de hidroxiapatita (11,16%), seguidos por polímeros a base de colágeno (5,42%) ou poliácido lático (5,30%) e compósitos baseados em fosfatos de cálcio (3,71%). Conclui-se que a utilização de células-tronco mesenquimais representa novos e eficazes procedimentos terapêuticos para regeneração óssea em Odontologia e Medicina.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Bone loss therapies using mesenchymal stem cells suggest a promising prospect for use in oral reconstructive surgeries. The aim of this study was to review the literature of the past 15 years with experimental theme to draw a profile of methodologies and results achieved in this area. A remarkable growth of publications occurred in economically developed countries. The bone marrow remains the main source of tissue mesenchymal stem cells (79.31%), characterized by adherence, immunophenotyping and multipotency, which can promote osteogenesis in vitro. Although there is a plurality of experimental models in vivo (animal species) and clinical studies (anatomical sites), there is prevalence of preclinical trials of cell therapy (27.03%), indicating good tissue biocompatibility and the highest osteogenesis after graft. Clinical studies have related positive results in the treatment of periodontal defects, alveolar ridge deficiency, congenital alveolar cleft, extensive cranial defects, maxillary sinus lifting and mandibular atrophy after radiation. The most used biomaterials as cell carriers were hydroxyapatite-based bioceramics (11.16%) followed by collagen- (5.42%) or poly lactic acid- (5.30%) based polymers and calcium phosphates-based composites (3.71%). We concluded that the use of mesenchymal stem cells represent new and effective therapeutic tools for bone regeneration in dentistry and medicine.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Células-tronco]]></kwd>
<kwd lng="pt"><![CDATA[Materiais biocompatíveis]]></kwd>
<kwd lng="pt"><![CDATA[Osteogênese]]></kwd>
<kwd lng="en"><![CDATA[Stem cells]]></kwd>
<kwd lng="en"><![CDATA[Biocompatible materials]]></kwd>
<kwd lng="en"><![CDATA[Osteogenesis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b>ARTIGOS CIENT&Iacute;FICOS</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="verdana"><b><a name="tx"></a>Revis&atilde;o sistem&aacute;tica sobre o uso de c&eacute;lulas-tronco mesenquimais em terapias de perdas &oacute;sseas</b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Systematic review of use of mesenchymal stem cells in bone loss therapies</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Igor Iuco Castro-Silva<Sup>I</Sup>; Lawrence Andrade Costa da Rocha Coutinho<Sup>II</Sup>; Jos&eacute; Mauro Granjeiro<Sup>III</Sup></b></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Mestre em Patologia. Professor Substituto do Departamento de Biologia Celular e Molecular, Universidade Federal Fluminense, Niter&oacute;i, RJ, Brasil    <br>   <sup>II</sup>Especialista em Geriatria e Gerontologia. Fisioterapeuta Supervisor da Associa&ccedil;&atilde;o Fluminense de Reabilita&ccedil;&atilde;o, Niter&oacute;i, RJ, Brasil    ]]></body>
<body><![CDATA[<br>   <sup>III</sup>Professor Adjunto do Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niter&oacute;i, RJ, Brasil. Pesquisador-S&ecirc;nior do Instituto Nacional de Metrologia, Normaliza&ccedil;&atilde;o e Qualidade Industrial, Duque de Caxias, RJ, Brasil</font></p>     <p><font size="2" face="Verdana"><a href="#end">Endere&ccedil;o para correspond&ecirc;ncia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMO</b></font></p>     <p><font size="2" face="Verdana">Terapias de perdas &oacute;sseas com c&eacute;lulas-tronco mesenquimais sugerem uma promissora perspectiva de uso em cirurgias orais reconstrutivas. O objetivo deste estudo foi realizar um levantamento bibliogr&aacute;fico dos &uacute;ltimos 15 anos com trabalhos experimentais tem&aacute;ticos para tra&ccedil;ar um perfil de metodologias e resultados alcan&ccedil;ados nesta &aacute;rea. Um destac&aacute;vel crescimento de publica&ccedil;&otilde;es ocorreu em pa&iacute;ses economicamente desenvolvidos. A medula &oacute;ssea se mant&eacute;m como a principal fonte tecidual de c&eacute;lulas-tronco mesenquimais (79,31%), caracterizadas por ades&atilde;o, imunofenotipagem e multipot&ecirc;ncia, capazes de promover a osteog&ecirc;nese <i>in vitro</i>. Embora exista pluralidade de modelos experimentais <i>in vivo</i> (esp&eacute;cies animais) e cl&iacute;nicos (s&iacute;tios anat&ocirc;micos), h&aacute; preval&ecirc;ncia de testes pr&eacute;-cl&iacute;nicos de terapia celular (27,03%), que indicam boa bicompatibilidade tecidual e osteog&ecirc;nese aumentada p&oacute;s-enxerto. Estudos cl&iacute;nicos t&ecirc;m relatado resultados positivos para o tratamento de defeitos periodontais, rebordo alveolar deficiente, fenda alveolar cong&ecirc;nita, defeitos cranianos extensos, levantamento de seio maxilar e atrofia mandibular p&oacute;s-irradia&ccedil;&atilde;o. Os biomateriais carreadores de c&eacute;lulas mais utilizados foram biocer&acirc;micas a base de hidroxiapatita (11,16%), seguidos por pol&iacute;meros a base de col&aacute;geno (5,42%) ou poli&aacute;cido l&aacute;tico (5,30%) e comp&oacute;sitos baseados em fosfatos de c&aacute;lcio (3,71%). Conclui-se que a utiliza&ccedil;&atilde;o de c&eacute;lulas-tronco mesenquimais representa novos e eficazes procedimentos terap&ecirc;uticos para regenera&ccedil;&atilde;o &oacute;ssea em Odontologia e Medicina.</font></p>     <p><font size="2" face="Verdana"><b>Palavras-chave:</b> C&eacute;lulas-tronco. Materiais biocompat&iacute;veis. Osteog&ecirc;nese.</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana">Bone loss therapies using mesenchymal stem cells suggest a promising prospect for use in oral reconstructive surgeries. The aim of this study was to review the literature of the past 15 years with experimental theme to draw a profile of methodologies and results achieved in this area. A remarkable growth of publications occurred in economically developed countries. The bone marrow remains the main source of tissue mesenchymal stem cells (79.31%), characterized by adherence, immunophenotyping and multipotency, which can promote osteogenesis in vitro. Although there is a plurality of experimental models in vivo (animal species) and clinical studies (anatomical sites), there is prevalence of preclinical trials of cell therapy (27.03%), indicating good tissue biocompatibility and the highest osteogenesis after graft. Clinical studies have related positive results in the treatment of periodontal defects, alveolar ridge deficiency, congenital alveolar cleft, extensive cranial defects, maxillary sinus lifting and mandibular atrophy after radiation. The most used biomaterials as cell carriers were hydroxyapatite-based bioceramics (11.16%) followed by collagen- (5.42%) or poly lactic acid- (5.30%) based polymers and calcium phosphates-based composites (3.71%). We concluded that the use of mesenchymal stem cells represent new and effective therapeutic tools for bone regeneration in dentistry and medicine.</font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> Stem cells. Biocompatible materials. Osteogenesis.</font></p> <hr size="1" noshade>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>INTRODU&Ccedil;&Atilde;O</b></font></p>     <p><font size="2" face="Verdana">O tratamento de defeitos &oacute;sseos extensos advindos de traumas ou patologias constitui um desafio para a regenera&ccedil;&atilde;o tecidual, em especial para cirurgia craniomaxilofacial e ortop&eacute;dica<Sup>8</Sup>. Visando superar a morbidade de enxertos aut&oacute;genos e as limita&ccedil;&otilde;es de enxertos al&oacute;genos, xen&oacute;genos e alopl&aacute;sticos, t&ecirc;m se desenvolvido muitos estudos relacionados &agrave; terap&ecirc;utica com base nos fundamentos da Bioengenharia, utilizando c&eacute;lulas-tronco mesenquimais (CTM) e dispositivos implant&aacute;veis para favorecer o processo regenerativo<Sup>8,15</Sup>. Estas c&eacute;lulas possuem capacidade de autorenova&ccedil;&atilde;o e diferencia&ccedil;&atilde;o m&uacute;ltipla, vistas como reservat&oacute;rios presentes no corpo humano at&eacute; que, sob est&iacute;mulos locais, haja mobiliza&ccedil;&atilde;o e direcionamento ao reparo &oacute;sseo<Sup>9</Sup>.</font></p>     <p><font size="2" face="Verdana">Buscando tra&ccedil;ar um perfil de metodologias utilizadas e graus de efic&aacute;cia em terapia celular segundo as publica&ccedil;&otilde;es mais recentes, o objetivo deste estudo retrospectivo foi analisar os trabalhos realizados com a tem&aacute;tica de CTM e terapia de perdas &oacute;sseas.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>MATERIAL E M&Eacute;TODOS</b></font></p>     <p><font size="2" face="Verdana">Foi realizado um levantamento bibliogr&aacute;fico de artigos publicados em peri&oacute;dicos entre janeiro de 1995 e dezembro de 2009, atrav&eacute;s do banco de dados eletr&ocirc;nico Pubmed (<a href="http://www.ncbi.nlm.nih.gov" target="_blank">www.ncbi.nlm.nih.gov</a>), utilizando como descritores "<i>mesenchymal stem cell</i>" e "<i>bone</i>". Em busca n&atilde;o-refinada, foi recuperado neste per&iacute;odo um expressivo n&uacute;mero de refer&ecirc;ncias bibliogr&aacute;ficas internacionais na l&iacute;ngua inglesa (6.151). Para a padroniza&ccedil;&atilde;o de resultados, foram selecionados apenas artigos experimentais e casos cl&iacute;nicos dentro da tem&aacute;tica de reparo &oacute;sseo, o que contabilizou um somat&oacute;rio final de 1.624 artigos distintos, classificados nas seguintes vari&aacute;veis: 1) distribui&ccedil;&atilde;o temporo-espacial das publica&ccedil;&otilde;es tem&aacute;ticas, 2) tipo de CTM de acordo com o per&iacute;odo natal, 3) crit&eacute;rio de identifica&ccedil;&atilde;o de CTM, 4) fonte tecidual doadora de CTM, 5) modelo de caracteriza&ccedil;&atilde;o biol&oacute;gica (<i>in vitro, in vivo</i> ou cl&iacute;nica), 6) s&iacute;tio anat&ocirc;mico receptor de CTM, 7) modelo animal doador e receptor de CTM, 8) tipo de biomaterial carreador de CTM e 9) tipos de defeitos &oacute;sseos tratados com CTM.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>RESULTADOS</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">As publica&ccedil;&otilde;es cient&iacute;ficas tem&aacute;ticas no per&iacute;odo de 1995 a 2002 tenderam ao crescimento linear discreto, seguido por aumento marcante at&eacute; 2008 e um pico em 2009, com 1.624 artigos (100%) e caracterizando um comportamento polinomial de segunda ordem (R = 0.981) (<a href="#fig01">Figura 1</a>).</font></p>     <p><a name="fig01"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07fig01.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Com rela&ccedil;&atilde;o &agrave; distribui&ccedil;&atilde;o geogr&aacute;fica, os 10 paises que produziram maior n&uacute;mero de publica&ccedil;&otilde;es dentro dos par&acirc;metros avaliados est&atilde;o representados na <a href="#fig02">Figura 2</a>. O Brasil ocupa o 19&ordm; lugar da lista geral, com 17 trabalhos (1,05% do total), entretanto toma a lideran&ccedil;a na Am&eacute;rica Latina, &agrave; frente de pa&iacute;ses cuja taxa de publica&ccedil;&atilde;o &eacute; inferior a 0,50%, como o Chile (8 ou 0,49%) e a Argentina (1 ou 0,06%).</font></p>     <p><a name="fig02"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07fig02.jpg"></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Foi poss&iacute;vel constatar a grande preval&ecirc;ncia de estudos com c&eacute;lulas-tronco mesenquimais adultas ou p&oacute;s-natais (94,15%) em compara&ccedil;&atilde;o com as embrion&aacute;rias ou pr&eacute;-natais (7,88%).</font></p>     <p><font size="2" face="Verdana">A determina&ccedil;&atilde;o fenot&iacute;pica das CTM &eacute; dif&iacute;cil, pois elas exibem uma morfologia fibroblast&oacute;ide inespec&iacute;fica. Os crit&eacute;rios associativos mais usados para a identifica&ccedil;&atilde;o de CTM<Sup>13</Sup>, foram: ader&ecirc;ncia (97,11%), imunofenotipagem (35,78%) e multipot&ecirc;ncia (17,12%). Ader&ecirc;ncia &eacute; a fixa&ccedil;&atilde;o de CTM aos frascos pl&aacute;sticos para cultura de c&eacute;lulas em poucas horas de contato. Imunofenotipagem &eacute; a rea&ccedil;&atilde;o positiva entre um anticorpo-fluorocromo e um ant&iacute;geno de superf&iacute;cie espec&iacute;fico de CTM (CD105, CD73 ou CD90), via citometria de fluxo ou imunoistoqu&iacute;mica. Multipot&ecirc;ncia refere-se &agrave; capacidade da CTM, sob condi&ccedil;&otilde;es apropriadas, de diferenciar-se em pelo menos 3 tipos de c&eacute;lulas de mesma linhagem, que al&eacute;m de osteoblastos podem gerar adip&oacute;citos, condroblastos, fibroblastos, mioblastos, odontoblastos e endot&eacute;lio; sua plasticidade pode ainda se estender a outras linhagens, como a transdiferencia&ccedil;&atilde;o em neur&ocirc;nios, hepat&oacute;citos e c&eacute;lulas do p&acirc;ncreas.</font></p>     <p><font size="2" face="Verdana">O isolamento de CTM tem sido realizado nos &uacute;ltimos 15 anos especialmente na medula &oacute;ssea (79,31%). Fontes teciduais alternativas incluem: tecido adiposo (6,65%), tecido muscular (4,50%), sangue (2,52%) ou parede (1,54%) de cord&atilde;o umbilical, peri&oacute;steo (3,02%), tecido &oacute;sseo (2,83%), tecido conjuntivo de &oacute;rg&atilde;os (pele: 0,86%; f&iacute;gado: 0,49%; pulm&atilde;o: 0,31%; mes&ecirc;nquima do palato e timo: 0,25% cada; seio maxilar ou aorta: 0,12% cada; tonsila palatina, intestino, ba&ccedil;o, p&acirc;ncreas, rim ou &uacute;tero: 0,06% cada), polpa dental de dentes permanentes (1,11%) ou dec&iacute;duos (0,49%), sangue perif&eacute;rico (1,48%), m&oacute;rula ou bl&aacute;stula (1,23%), &acirc;mnio (1,17%), placenta (1,11%), ligamento periodontal (1,05%), sin&oacute;via (0,86%) e papila dental (0,62%), dentre outras fontes (tecido cartilaginoso: 0,25%, hematoma de fratura: 0,18%, tend&atilde;o: 0,06%) (<a href="#fig03">Figura 3</a>).</font></p>     <p><a name="fig03"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07fig03.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">A pluralidade de modelos experimentais (esp&eacute;cies animais e s&iacute;tios anat&ocirc;micos) doadores e receptores de CTM tamb&eacute;m se faz presente. A origem humana &eacute; o principal alvo de estudos (53,02%), entretanto, a preval&ecirc;ncia de animais de pequeno porte (camundongos: 13,12%, coelhos: 6,72% e ratos: 5,14%) como os maiores transplantados com CTM (xen&oacute;genas: 16,14%, aut&oacute;genas: 10,84% ou al&oacute;genas: 7,64%) configura a etapa de testes pr&eacute;-cl&iacute;nicos em que se encontram as terapias celulares, com poucos estudos cl&iacute;nicos relatados (2,28%) (<a href="#fig04">Figura 4</a>).</font></p>     <p><a name="fig04"></a></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/iij/v5n3/a07fig04.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Os s&iacute;tios anat&ocirc;micos experimentais (estudos in vivo e cl&iacute;nicos) j&aacute; utilizados para enxerto de CTM e estudos de reparo &oacute;sseo podem se classificar em: sist&ecirc;micos (0,95%), quando mostram alguma patologia &oacute;ssea generalizada, ect&oacute;picos (15,59%), pr&oacute;prios para testes iniciais de biocompatibilidade, ou ortot&oacute;picos (21,04%), ideais para avaliar o comportamento osteog&ecirc;nico no s&iacute;tio-alvo do enxerto de CTM, como demonstrados na <a href="#fig05">Figura 5</a>.</font></p>     <p><a name="fig05"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07fig05.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Os estudos <i>in vitro</i> (97,17%) demonstraram a capacidade de diferencia&ccedil;&atilde;o &oacute;ssea de CTM em condi&ccedil;&otilde;es apropriadas, usando meio de cultura (</font><font>&#945;</font><font size="2" face="verdana">-MEM, DMEM, DMEM:HAMF12 ou </font><font>&#945;</font><font size="2" face="verdana">-MEM:HAMF<Sup>12</Sup>) suplementado com soro (fetal bovino ou aut&oacute;geno, 10%), dexametazona (10nM a 1</font><font>&#181;</font><font size="2" face="verdana">M), </font><font>&#946;</font><font size="2" face="verdana">-glicerosfosfato (10 </font><font>&#181;</font><font size="2" face="verdana">M a 10 mM) e &aacute;cido asc&oacute;rbico (10 </font><font>&#181;</font><font size="2" face="verdana">M a 10 mM), onde a concentra&ccedil;&atilde;o usada dos agentes osteoindutores &eacute; importante fator na modula&ccedil;&atilde;o tempo-resposta. A confirma&ccedil;&atilde;o funcional do processo de diferencia&ccedil;&atilde;o de CTM se d&aacute; pelo aumento da express&atilde;o de biomarcadores &oacute;sseos. Marcadores iniciais do processo s&atilde;o: CBFA-1/RUNX-2, osterix, TGF-</font><font>&#946;</font><font size="2" face="verdana">, BMP-2, col&aacute;geno I, fosfatase alcalina, osteonectina e osteopontina. Marcadores tardios s&atilde;o: osteocalcina, sialoprote&iacute;na &oacute;ssea, osteoprotegerina, dep&oacute;sitos de c&aacute;lcio intracelulares e n&oacute;dulos de mineraliza&ccedil;&atilde;o<Sup>23</Sup>.</font></p>     <p><font size="2" face="Verdana">Os estudos <i>in vivo</i> (27,03%) mostraram biocompatibilidade tecidual e osteog&ecirc;nese no s&iacute;tio de implanta&ccedil;&atilde;o, ectopicamente ou em defeitos &oacute;sseos induzidos. Enxerto de CTM em tecido subcut&acirc;neo promoveu mineraliza&ccedil;&atilde;o em curto per&iacute;odo (a partir de 3 semanas), constituindo um material bioativo e biocompat&iacute;vel (sem indu&ccedil;&atilde;o de resposta inflamat&oacute;ria intensa, rea&ccedil;&atilde;o de corpo estranho exacerbada e/ou focos de necrose)<Sup>10,16</Sup>. Em defeitos &oacute;sseos extensos ou cr&iacute;ticos, CTM mediam osteog&ecirc;nese de 4 a 12 semanas p&oacute;s-enxerto, refletindo o resultado positivo em defeitos cranianos<Sup>22</Sup> e mandibulares<Sup>12</Sup> como potencial aplica&ccedil;&atilde;o &agrave; cirurgia craniofacial, e em defeitos femorais<Sup>20</Sup>, tibiais<Sup>30</Sup> e radiais<Sup>33</Sup> dentre outros, &agrave; cirurgia ortop&eacute;dica.</font></p>     <p><font size="2" face="Verdana">A terapia celular usando CTM evolui no campo das pesquisas cl&iacute;nicas voltadas para o reparo &oacute;sseo (2,28%), com os principais progressos para a Odontologia demonstrados na <a href="#tab01">Tabela 1</a>. Resultados promissores surgem no tratamento de deformidades &oacute;sseas locais, de intensidade pequena (defeitos periodontais<Sup>34</Sup>) a moderada-grande (perda &oacute;ssea horizontal em rebordo alveolar<Sup>31</Sup>, fenda alveolar<Sup>18</Sup>, traumatismos cranianos em crian&ccedil;as<Sup>32</Sup>) com bom padr&atilde;o de reparo &oacute;sseo de 2 a 12 meses ap&oacute;s o trauma, de acordo com o tamanho da les&atilde;o. Cirurgias orais com finalidade prot&eacute;tica, tais como levantamento de seio maxilar<Sup>28</Sup> e aumento vertical de mand&iacute;bula<Sup>17</Sup>, que visam o ganho &oacute;sseo para posterior ancoragem de implantes osseointegr&aacute;veis de tit&acirc;nio, t&ecirc;m obtido boa previsibilidade cl&iacute;nica utilizando enxertos associados a CTM, com a forma&ccedil;&atilde;o de osso trabecular e lamelar 4 meses ap&oacute;s o procedimento. De maior interesse ortop&eacute;dico, a distra&ccedil;&atilde;o &oacute;ssea indicada para ganho &oacute;sseo em comprimento em casos de pseudoartrose e acondroplasia foi gradual e concomitante ao enxerto de CTM e demonstrou forma&ccedil;&atilde;o de calo &oacute;sseo em t&iacute;bia e f&ecirc;mur tratados<Sup>21</Sup>; de forma semelhante, lojas &oacute;sseas ap&oacute;s curetagem de les&atilde;o central demonstraram ossifica&ccedil;&atilde;o em 4 semanas p&oacute;s-enxerto<Sup>25</Sup>.</font></p>     ]]></body>
<body><![CDATA[<p><a name="tab01"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07tab01.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Existem duas vias de distribui&ccedil;&atilde;o de CTM: sist&ecirc;mica, por infus&atilde;o sangu&iacute;nea ou percut&acirc;nea, baseada no <i>homing</i> que orienta a migra&ccedil;&atilde;o destas c&eacute;lulas para o s&iacute;tio-alvo a ser reparado, aplic&aacute;vel em cirurgia cardiovascular<Sup>9</Sup>, ou t&oacute;pica, que usa biomateriais carreadores s&oacute;lidos ou gelatinosos, e aplica-se &agrave;s cirurgias craniomaxilofacial e ortop&eacute;dica<Sup>8,15</Sup>. As diferentes composi&ccedil;&otilde;es dos biomateriais carreadores de CTM est&atilde;o expressas na <a href="#fig06">Figura 6</a>, onde se destaca o grupo das biocer&acirc;micas, em especial a hidroxiapatita (HA, 11,16%), seguido por pol&iacute;meros a base de col&aacute;geno (5,42%) e derivados de poli&aacute;cido l&aacute;tico (PLA, 5,30%) e comp&oacute;sitos baseados em conjuga&ccedil;&otilde;es a fosfatos de c&aacute;lcio (3,71%).</font></p>     <p><a name="fig06"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n3/a07fig06.jpg"></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>DISCUSS&Atilde;O</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">O crescimento acelerado das publica&ccedil;&otilde;es sobre CTM e reparo &oacute;sseo &eacute; estimulado pela busca por melhor qualidade de vida, em especial para a consider&aacute;vel popula&ccedil;&atilde;o mundial idosa<Sup>8</Sup>, e encorajado pelo aprimoramento tecnol&oacute;gico e maior investimento dos pa&iacute;ses em pesquisas de ponta. Adicionalmente, o quadro alarmante de edentulismo no Brasil se tornou um problema de Sa&uacute;de P&uacute;blica, com uma grande demanda populacional carente de reabilita&ccedil;&atilde;o oral, e constituem hoje prioridade do Sistema &Uacute;nico de Sa&uacute;de os tratamentos odontol&oacute;gicos restauradores<Sup>6</Sup>.</font></p>     <p><font size="2" face="Verdana">O uso de CTM adultas tem vantagens frente ao de embrion&aacute;rias: aspectos legais e &eacute;ticos n&atilde;o-limitantes de uso<Sup>3</Sup>, maior facilidade para a coleta, t&eacute;cnica r&aacute;pida e clinicamente aplic&aacute;vel, n&atilde;o restrita ao &acirc;mbito de pesquisa como &eacute; o &uacute;ltimo caso<Sup>4</Sup>. Entretanto, a propor&ccedil;&atilde;o de CTM adultas &eacute; muito baixa (0,001-0,01%) e decresce com a idade<Sup>24</Sup>. Desde o primeiro isolamento de CTM em 1966 por Friedenstein e Petrakova<Sup>14</Sup>, a medula &oacute;ssea se mant&eacute;m como a sua fonte mais prevalente, considerada o padr&atilde;o-ouro. Para o cirurgi&atilde;o-dentista, o peri&oacute;steo<Sup>1</Sup> e a polpa dental<Sup>7</Sup> representam fontes promissoras de CTM, devido &agrave; facilidade de coleta e menor morbidade do s&iacute;tio doador do que a medula &oacute;ssea humana<Sup>11</Sup>.</font></p>     <p><font size="2" face="Verdana">No Brasil, a Ag&ecirc;ncia Nacional de Vigil&acirc;ncia Sanit&aacute;ria regulamenta a coleta, o transporte e o armazenamento de c&eacute;lulas-tronco humanas em biobancos<Sup>5</Sup>, assim como o seu controle de qualidade e a sua utiliza&ccedil;&atilde;o destinada &agrave; pesquisa cl&iacute;nica e terapia<Sup>2</Sup>.</font></p>     <p><font size="2" face="Verdana">Esta modalidade terap&ecirc;utica mostra seguran&ccedil;a biol&oacute;gica, embora a supera&ccedil;&atilde;o da barreira imunol&oacute;gica interespec&iacute;fica no caso de xenotransplantes de CTM seja um desafio<Sup>26</Sup>. N&atilde;o foram verificados casos de malignidade; CTM normais expressam genes inibidores de tumorig&ecirc;nese em escala significantemente maior do que os promotores deste processo<Sup>27</Sup>. Entretanto, existem poucas investiga&ccedil;&otilde;es a longo prazo em humanos, que devem ser conduzidas para melhor compreender sua efetividade e distribui&ccedil;&atilde;o ap&oacute;s implanta&ccedil;&atilde;o.</font></p>     <p><font size="2" face="Verdana">As composi&ccedil;&otilde;es encontradas nos biomateriais carreadores de CTM podem influenciar de diferentes formas o reparo &oacute;sseo<Sup>8,15,19</Sup>, favorecendo ades&atilde;o e prolifera&ccedil;&atilde;o celular (col&aacute;geno, fibrina, cer&acirc;mica de alumina, plasma rico em plaquetas, polietilenoglicol/PEG, poli-&epsilon;-caprolactone/PCL, poli&aacute;cido l&aacute;tico-coglic&oacute;lico/PLGA, poli-N-isopropilacrilamida-co-&aacute;cido acr&iacute;lico), osteodiferencia&ccedil;&atilde;o (col&aacute;geno, HA, beta-tric&aacute;lcio fosfato/</font><font>&#946;</font><font size="2" face="verdana">TCP, outros fosfatos de c&aacute;lcio, PEG), angiog&ecirc;nese (cola de fibrina), penetra&ccedil;&atilde;o de c&eacute;lulas por poros (poligalactina 910), resist&ecirc;ncia mec&acirc;nica (fibra de tit&acirc;nio, cer&acirc;mica de alumina) e reabsor&ccedil;&atilde;o proporcional &agrave; reposi&ccedil;&atilde;o por novo osso (col&aacute;geno, </font><font>&#946;</font><font size="2" face="verdana">TCP, PLGA, matriz &oacute;ssea desmineralizada). A uni&atilde;o de composi&ccedil;&otilde;es diferentes pode gerar um biomaterial melhorado (comp&oacute;sito)<Sup>29</Sup>, sinergicamente favor&aacute;vel &agrave; ancoragem de CTM e potencializando a osteog&ecirc;nese no s&iacute;tio-alvo.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>CONCLUS&Atilde;O</b></font></p>     <p><font size="2" face="Verdana">Com base nos trabalhos avaliados p&ocirc;de-se constatar que as c&eacute;lulas-tronco mesenquimais t&ecirc;m sido amplamente estudadas em pesquisas <i>in vitro, in vivo</i> e cl&iacute;nicas, demonstrando potencial osteog&ecirc;nico e efic&aacute;cia no tratamento de defeitos &oacute;sseos, o que constitui perspectiva promissora para t&eacute;cnicas regenerativas em Odontologia e Medicina. Ainda &eacute; um desafio o desenvolvimento de carreadores para as c&eacute;lulas progenitoras, pois devem variar de acordo com a aplica&ccedil;&atilde;o desejada. &Eacute; estrat&eacute;gica a realiza&ccedil;&atilde;o de estudos cl&iacute;nicos controlados e cegos a fim de avaliar o reparo &oacute;sseo, bem como o custo efetividade dos procedimentos de forma que os gestores em sa&uacute;de possam tomar decis&otilde;es informadas com base em evid&ecirc;ncias cient&iacute;ficas.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>REFER&Ecirc;NCIAS</b></font></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p><font size="2" face="Verdana">33. Xie H, Yang F, Deng L, Luo J, Qin T, Li X, et al. The performance of a bone-derived scaffold material in the repair of critical bone defects in a rhesus monkey model. Biomaterials. 2007;28(22):3314-24.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=090948&pid=S1984-5960201000030000700033&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana">34. Yamada Y, Ueda M, Hibi H, Baba S. A novel approach to periodontal tissue regeneration with mesenchymal stem cells and platelet-rich plasma using tissue engineering technology: A clinical case report. Int J Periodontics Restorative Dent. 2006;26(4):363-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=090950&pid=S1984-5960201000030000700034&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><font size="2" face="Verdana"><a name="end"></a><a href="#tx"><img src="/img/revistas/iij/v5n3/seta.jpg" border="0"></a> <b>Endere&ccedil;o para correspond&ecirc;ncia:</b>    <br>   Igor Iuco Castro-Silva    <br>   Laborat&oacute;rio de Bioengenharia, Biomateriais e Mineraliza&ccedil;&atilde;o Biol&oacute;gica    <br>   Hospital Universit&aacute;rio Ant&ocirc;nio Pedro    ]]></body>
<body><![CDATA[<br>   Rua Marqu&ecirc;s do Paran&aacute;, 303 - 4&ordm;. andar - Emerg&ecirc;ncia - Unidade de Pesquisa Cl&iacute;nica    <br>   24033-900 - Niter&oacute;i - Rio de Janeiro - Brasil    <br>   E-mail: <a href="mailto:igoriuco@gmail.com">igoriuco@gmail.com</a></font></p>     <p><font size="2" face="Verdana">Recebido: 19/07/2010    <br>   Aceito: 08/11/2010</font></p>      ]]></body>
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