<?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>0124-8146</journal-id>
<journal-title><![CDATA[Investigaciones Andina]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. andina]]></abbrev-journal-title>
<issn>0124-8146</issn>
<publisher>
<publisher-name><![CDATA[Fundación Universitaria del Área Andina - FUNANDI]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-81462010000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CICATRIZACIÓN: PROCESO DE REPARACIÓN TISULAR. APROXIMACIONES TERAPÉUTICAS]]></article-title>
<article-title xml:lang="en"><![CDATA[WOUND HEALING: PROCESS OF TISSUE REPAIR THERAPEUTIC APPROACHES]]></article-title>
<article-title xml:lang="pt"><![CDATA[CICATRIZAÇÃO: PROCESSO DE REPARAÇÃO TISULAR. APROXIMAÇÕES TERAPÊUTICAS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia Basto]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,FUNANDI Ciencias Básicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<volume>12</volume>
<numero>20</numero>
<fpage>85</fpage>
<lpage>98</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-81462010000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-81462010000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-81462010000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: el proceso de cicatrización es una secuencia de eventos que depende de la dinámica celular del tejido celular lesionado y circundante. Estas células permiten la liberación de factores de crecimiento y citocinas para llevar a cabo la reparación en tres fases: aguda o inflamatoria, proliferación celular y remodelación tisular. Métodos: se buscaron artículos en las principales bases de datos científicas como PubMed del NCBI, Science Direct, HINARIy JSTOR. Resultados: los estudios relacionados en la presente revisión, intentan mejorar y optimizar el fenómeno de la cicatrización en adultos, con el fin de acelerar el tiempo de reparación y evitar la aparición de procesos infecciosos secundarios, al restaurar el transcurso normal en la reparación de heridas crónicas. Conclusiones: es evidente que los extractos crudos procedentes de hojas, cáscaras, flores y corteza de raíz, tienen potencial para acelerar los eventos de la cicatrización. Sin embargo, se desconocen en la mayoría de los casos los metabolitos activos y sus mecanismos de acción sobre las células y los factores de crecimiento que intervienen en el proceso, por lo que se requerirán más estudios para profundizar en este aspecto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: the wound healing process is a sequence of events depends on the cellular dynamics of the injured and surrounding tissue, allowing the release of growth factors and cytokines to carry out the repair in three phases: acute or inflammatory, cell proliferation and tissue remodeling. Methods: we searched for articles in major scientific databases as PubMed of NCBI, Science Direct, HINARI and JSTOR. Results: related studies in this review, trying to improve and optimize the phenomenon of scarring in adult, in order to seep up the repair time and avoid the occurrence of secondary infectious processes and restoring normal process in the repair of chronic wounds. Conclusions: it is clear that the crude extracts from leaves, shells, flowers and root bark have the potential to accelerate healing events. However, it is unknown in most cases, the active metabolites and their mechanisms of action on cells and growth factors involved in the process, so further studies are required to investigate this aspect.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Introdução: o processo de cicatrização é uma sequência de eventos dependentes da dinâmica do tecido celular lesionado e circundante. Estas células permitem a liberação de fatores de crescimento e citocinas para levar a cabo a reparação em três fases: aguda ou inflamatória, proliferação celular e remodelação tisular. Métodos: pesquisaram-se artigos nas principias bases de dados científicos, como PubMed del NCBI, Science Direct, HINARI e JSTOR. Resultados: os estudos relacionados com a presente revisão tentam melhorar e otimizar o fenômeno da cicatrização em adultos, com o fim de acelerar o tempo de reparação e evitar, assim, a aparição de processos infecciosos secundários e restaurar o processo normal da reparação das feridas crônicas. Conclusões: a busca de estratégias para a eleição de uma terapia ideal, que garanta a aceleração dos eventos e evite, ao mesmo tempo, a inflamação e a proliferação de microorganismos.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cicatrización]]></kwd>
<kwd lng="es"><![CDATA[factores de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[plantas]]></kwd>
<kwd lng="es"><![CDATA[terapia]]></kwd>
<kwd lng="en"><![CDATA[wound healing]]></kwd>
<kwd lng="en"><![CDATA[growth factors]]></kwd>
<kwd lng="en"><![CDATA[plants]]></kwd>
<kwd lng="en"><![CDATA[drugs therapy]]></kwd>
<kwd lng="pt"><![CDATA[cicatrização]]></kwd>
<kwd lng="pt"><![CDATA[fatores de crescimento]]></kwd>
<kwd lng="pt"><![CDATA[plantas]]></kwd>
<kwd lng="pt"><![CDATA[terapia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="center"><font size="4"><b>CICATRIZACI&Oacute;N: PROCESO DE REPARACI&Oacute;N TISULAR.   APROXIMACIONES TERAP&Eacute;UTICAS</b></font></p>     <p align="center"><b><font size="3">WOUND HEALING: PROCESS OF TISSUE REPAIR   THERAPEUTIC APPROACHES</font></b></p>     <p align="center"><font size="3"><b>CICATRIZA&Ccedil;&Atilde;O: PROCESSO DE REPARA&Ccedil;&Atilde;O TISULAR.   APROXIMA&Ccedil;&Otilde;ES TERAP&Ecirc;UTICAS</b></font></p>     <p><b>Carlos Valencia Basto*</b></p>     <p>* M&eacute;dico Veterinario y Zootecnista. Docente Ciencias B&aacute;sicas FUNANDI -   Docente L&iacute;der Semillero SCIRE. Candidato al t&iacute;tulo de Mag&iacute;ster en Biolog&iacute;a   Molecular y Biotecnolog&iacute;a.</p> <hr>     <p><b><font size="3">Resumen</font></b></p>     <p><b><i>Introducci&oacute;n: </i></b><i>el proceso de cicatrizaci&oacute;n es una secuencia   de eventos que depende de la din&aacute;mica celular del tejido celular lesionado y   circundante. Estas c&eacute;lulas permiten la liberaci&oacute;n de factores de crecimiento y   citocinas para llevar a cabo la reparaci&oacute;n en tres fases: aguda o inflamatoria,   proliferaci&oacute;n celular y remodelaci&oacute;n tisular.</i></p>     <p><b><i>M&eacute;todos: </i></b><i>se buscaron art&iacute;culos en las principales bases de   datos cient&iacute;ficas como PubMed del NCBI, Science Direct, HINARIy JSTOR.</i></p>     <p><b><i>Resultados: </i></b><i>los estudios relacionados en la presente   revisi&oacute;n, intentan mejorar y optimizar el fen&oacute;meno de la cicatrizaci&oacute;n en   adultos, con el fin de acelerar el tiempo de reparaci&oacute;n y evitar la aparici&oacute;n de   procesos infecciosos secundarios, al restaurar el transcurso normal en la   reparaci&oacute;n de heridas cr&oacute;nicas.</i></p>     ]]></body>
<body><![CDATA[<p><b><i>Conclusiones: </i></b><i>es evidente que los extractos crudos   procedentes de hojas, c&aacute;scaras, flores y corteza de ra&iacute;z, tienen potencial para   acelerar los eventos de la cicatrizaci&oacute;n. Sin embargo, se desconocen en la   mayor&iacute;a de los casos los metabolitos activos y sus mecanismos de acci&oacute;n sobre   las c&eacute;lulas y los factores de crecimiento que intervienen en el proceso, por lo   que se requerir&aacute;n m&aacute;s estudios para profundizar en este aspecto.</i></p>     <p><b><i><font size="3">Palabras clave: </font></i></b>cicatrizaci&oacute;n, factores de   crecimiento, plantas, terapia.</p> <hr>     <p><b><font size="3">Abstract</font></b></p>     <p><b><i>Introduction: </i></b><i>the wound healing process is a sequence of   events depends on the cellular dynamics of the injured and surrounding tissue,   allowing the release of growth factors and cytokines to carry out the repair in   three phases: acute or inflammatory, cell proliferation and tissue   remodeling.</i></p>     <p><b><i>Methods: </i></b><i>we searched for articles in major scientific   databases as PubMed of NCBI, Science Direct, HINARI and JSTOR.</i></p>     <p><b><i>Results: </i></b><i>related studies in this review, trying to improve   and optimize the phenomenon of scarring in adult, in order to seep up the repair   time and avoid the occurrence of secondary infectious processes and restoring   normal process in the repair of chronic wounds.</i></p>     <p><b><i>Conclusions: </i></b><i>it is clear that the crude extracts from   leaves, shells, flowers and root bark have the potential to accelerate healing   events. However, it is unknown in most cases, the active metabolites and their   mechanisms of action on cells and growth factors involved in the process, so   further studies are required to investigate this aspect.</i></p>     <p><b><i><font size="3">Keywords:</font> </i></b>wound healing, growth factors,   plants, drugs therapy.</p> <hr>     <p><b><font size="3">Resumo</font></b></p>     <p><b><i>Introdu&ccedil;&atilde;o: </i></b><i>o processo de cicatriza&ccedil;&atilde;o &eacute; uma sequ&ecirc;ncia de   eventos dependentes da din&acirc;mica do tecido celular lesionado e circundante. Estas   c&eacute;lulas permitem a libera&ccedil;&atilde;o de fatores de crescimento e citocinas para levar a   cabo a repara&ccedil;&atilde;o em tr&ecirc;s fases: aguda ou inflamat&oacute;ria, prolifera&ccedil;&atilde;o celular e   remodela&ccedil;&atilde;o tisular.</i></p>     ]]></body>
<body><![CDATA[<p><b><i>M&eacute;todos: </i></b><i>pesquisaram-se artigos nas principias bases de   dados cient&iacute;ficos, como PubMed del NCBI, Science Direct, HINARI e JSTOR.</i></p>     <p><b><i>Resultados: </i></b><i>os estudos relacionados com a presente revis&atilde;o   tentam melhorar e otimizar o fen&ocirc;meno da cicatriza&ccedil;&atilde;o em adultos, com o fim de   acelerar o tempo de repara&ccedil;&atilde;o e evitar, assim, a apari&ccedil;&atilde;o de processos   infecciosos secund&aacute;rios e restaurar o processo normal da repara&ccedil;&atilde;o das feridas   cr&ocirc;nicas.</i></p>     <p><b><i>Conclus&otilde;es: </i></b><i>a busca de estrat&eacute;gias para a elei&ccedil;&atilde;o de uma   terapia ideal, que garanta a acelera&ccedil;&atilde;o dos eventos e evite, ao mesmo tempo, a   inflama&ccedil;&atilde;o e a prolifera&ccedil;&atilde;o de microorganismos.</i></p>     <p><b><i><font size="3">Palavras chave:</font></i></b>cicatriza&ccedil;&atilde;o,   fatores de crescimento, plantas, terapia.</p>     <p><b><i>Fecha de recibo:</i></b>Noviembre/2009    <br>     <b><i>Fecha   aprobaci&oacute;n:</i></b>Marzo/2010</p> <hr>     <p><b><font size="3">Introducci&oacute;n</font></b></p>     <p>La cicatrizaci&oacute;n es un proceso din&aacute;mico mediado por prote&iacute;nas solubles   (citocinas y factores de crecimiento) y c&eacute;lulas encargadas de la proliferaci&oacute;n   celular para el restablecimiento del tejido lesionado (1). Hay dos tipos de   cicatrizaci&oacute;n, de primera intenci&oacute;n, que ocurre durante las primeras 12-24 horas   despu&eacute;s de haber sido cerrada la herida, al aproximar sus bordes con suturas,   cintas, o alg&uacute;n dispositivo mec&aacute;nico. El segundo tipo, de segunda intenci&oacute;n, el   cual se caracteriza porque no se alcanza a regenerar la arquitectura normal de   la piel, debido a la p&eacute;rdida extensiva de tejido por un trauma severo o una   quemadura, y cuyo tiempo de resoluci&oacute;n depender&aacute; de la extensi&oacute;n de la herida   (2).</p>     <p>Normalmente la cascada de eventos que producen la reparaci&oacute;n del tejido   lesionado, se conduce por factores de crecimiento generados por las c&eacute;lulas   implicadas en el proceso como queratinocitos, fibroblastos y c&eacute;lulas   inflamatorias. Estos factores de crecimiento regulan la proliferaci&oacute;n y la   diferenciaci&oacute;n celular, y son importantes en el desarrollo embrionario, la   regeneraci&oacute;n tisular (a nivel fetal) y la reparaci&oacute;n (2). Muchos de estos   factores act&uacute;an en cada una de las etapas del proceso de cicatrizaci&oacute;n. En la   fase aguda o inflamatoria, se destacan por su actividad el Factor de Crecimiento   Transformante <i>beta </i>(TGFP), Factor de Crecimiento Derivado de las   Plaquetas (PDGF), y Factor Estimulante de Colonias de Granulocitos (G-CSF),   junto con interleucinas implicadas en la inflamaci&oacute;n. Durante la fase de   proliferaci&oacute;n celular y formaci&oacute;n del tejido de granulaci&oacute;n, sobresalen el   Factor de Crecimiento Epidermal (EGF), Factor de Crecimiento de los   Queratinocitos (KGF), Factor de Crecimiento de los Fibroblastos b&aacute;sico (bFGF),   Factor de Necrosis Tumoral (TNF), Factor de Crecimiento Endotelial Vascular   (VEGF), Factor de Crecimiento Nervioso (NGF) e IGF (Factor de</p>     <p>Crecimiento Insul&iacute;nico). Finalmente, la etapa de remodelaci&oacute;n es conducida   por factores como: Factor de Crecimiento de los Hepatocitos (HGF), KGF, EGF,   bFGF, TGFP y PDGF (7,8).</p>     ]]></body>
<body><![CDATA[<p>La presente revisi&oacute;n pretende recapitular las diferentes formas en las cuales   pueden tratarse las heridas de la piel. Una de ellas se basa en modelos <i>in   vivo </i>como heridas incisionales, excisionales o de espacio muerto (3),y   quemaduras de la piel (4, 5). Otra manera de hacerlo es a trav&eacute;s de modelos <i>in vitro </i>con cultivos y cocultivos celulares de queratinocitos y   fibroblastos, o en interfases l&iacute;quido-aire (6). Las aproximaciones terap&eacute;uticas   incluir&aacute;n algunos f&aacute;rmacos novedosos, extractos naturales de tipo animal o   vegetal y la aplicaci&oacute;n de factores de crecimiento ex&oacute;genos.</p>     <p><b><font size="3">M&eacute;todos</font></b></p>     <p>La b&uacute;squeda de art&iacute;culos para la revisi&oacute;n se llev&oacute; a cabo en las bases de   datos: NCBI (National Center for Biotechnology Information), a la cual   pertenecen PubMed, MEDLINE y el National Institute of Health. Igualmente se   hicieron b&uacute;squedas en Hinari, Science Direct y JSTOR. La b&uacute;squeda en PubMed se   realiz&oacute; con base en los t&iacute;tulos de t&eacute;rminos m&eacute;dicos (Medical Subjects Headings)   MESH, con la utilizaci&oacute;n de los vocablos "wound healing" y los subencabezados   "drug therapy", "physiology" y "pharmacology". Para ello se emple&oacute; el conector   boleano AND. Esta b&uacute;squeda arroj&oacute; 73643 art&iacute;culos, de los cuales 8060 fueron   revisiones de literatura y 6420 trabajos originales de texto libre completo   (free full text). La b&uacute;squeda en HINARI fue m&aacute;s espec&iacute;fica, ya que se   encontraron art&iacute;culos definidos previamente en la revista Nature. Para la   b&uacute;squeda en la base de datos de Science Direct se utilizaron las palabras clave   "wound healing" AND "plants" las cuales arrojaron como resultado 9119 art&iacute;culos.   Los art&iacute;culos finalmente seleccionados fueron aquellos que estuvieron acordes   con los objetivos del presente art&iacute;culo.</p>     <p>Finalmente se determin&oacute; el impacto de las revistas y art&iacute;culos seleccionados   para la revisi&oacute;n; se efectu&oacute; un an&aacute;lisis en el "Journal Metrics" de la base de   datos Scopus (<a href="http://info.scopus.com/journalmetrics/?url=journalmetrics" target="_blank">http://info.scopus.com/journalmetrics/?url=journalmetrics</a>) y   la base de datos del freemedicaljournals (<a href="http://www.freemedicaljournals.com/fmj/QV.HTM" target="_blank">http://www.freemedicaljournals.com/fmj/QV.HTM</a>). Una vez   establecidos los impactos de cada revista seleccionada, se encontraron 8   revistas de alto impacto, entre ellos Nature, New England Journal of Medicine,   Biomaterials, Acta Biomateriala, Infection and Immunity, Journal Investigation   of Dermatology, FASEB J, American Journal ofPhysiology, Regulatory, Integrative   and Comparative Physiology. Igualmente se encontraron 6 revistas de bajo   impacto, entre ellas est&aacute;n: Pharmacology Research, Current of Science, American   Journal of Surgery, Phytomedicine, Surgery, Wound Repair and Regeneration,   Burns. Las dem&aacute;s consultadas no aparecieron en estas bases de datos, pero   estuvieron relacionadas con los temas y los objetivos de la presente   revisi&oacute;n.</p>     <p><b><font size="3">Resultados</font></b></p>     <p><b>Proceso de cicatrizaci&oacute;n</b></p>     <p>La cicatrizaci&oacute;n es un mecanismo que depende de la hemostasis y de un estado   inflamatorio inicial, causado por la lesi&oacute;n (7, 8). Esta etapa se conoce como   fase aguda (9). Posteriormente entra en una fase proliferativa (9, 8) de c&eacute;lulas   epidermales, endoteliales y de fibroblastos, que generar&aacute;n un tejido de   granulaci&oacute;n inicial (10). Luego sobreviene una fase inflamatoria tard&iacute;a,   caracterizada por neovascularizaci&oacute;n y dependiente de factores regulatorios   como: el Factor de Crecimiento Endotelial Vascular (VEGF), diferentes   neurotrofinas que estimulan la proliferaci&oacute;n, la actividad quimiot&aacute;ctica y la   supervivencia de diferentes poblaciones celulares en piel (11), encargados de   generar una nueva matriz de col&aacute;geno (1, 10, 13). Finalmente se forma una escara   (9) y se produce el remodelamiento del tejido de granulaci&oacute;n, con la generaci&oacute;n   de nuevas fibras de col&aacute;geno y la diferenciaci&oacute;n de los fibroblastos en   miofibroblastos, que aumentan la fuerza tensil y permiten la aproximaci&oacute;n de los   bordes de la lesi&oacute;n (1, 7, 10, 12). Un elemento estructural importante de la   matriz extracelular son los proteoglicanos (PGs), los cuales adem&aacute;s de cumplir   una funci&oacute;n estructural, al absorber agua y llenar los espacios entre el   col&aacute;geno y las fibras de elastina, tiene funciones regulatorias al influenciar   la proliferaci&oacute;n, la migraci&oacute;n y la adhesi&oacute;n celular (13).</p>     <p><b>Aproximaciones terap&eacute;uticas </b></p>     <p><b>A. F&aacute;rmacos</b><b></b></p>     <p>Los f&aacute;rmacos empleados para reepitelizaci&oacute;n o aumento de la fuerza tensil de   las heridas, pueden clasificarse bajo el criterio de su aplicaci&oacute;n, generalmente   t&oacute;pica para aquellos que se utilizan en ung&uuml;entos o cremas. Igualmente hay   f&aacute;rmacos de uso parenteral, que incluyen v&iacute;a oral, intramuscular e inyecciones   directas en los sitios o alrededor de las heridas.</p>     ]]></body>
<body><![CDATA[<p>En aplicaciones t&oacute;picas se emplean f&aacute;rmacos como el &aacute;cido lisofosfat&iacute;dico en   un modelo <i>in vivo, </i>el cual promueve un acelerado cierre de la herida,   aumenta el grosor neoepitelial y la migraci&oacute;n de c&eacute;lulas macr&oacute;fago-histiocito   (15). Normalmente los tratamientos para quemaduras en piel, utilizan productos   de uso t&oacute;pico basados en plata como la sulfadiazina de plata, las sales de plata   (AgCl, AgNO<sub>3</sub>, AgSO<sub>4</sub>), sistemas de liberaci&oacute;n de plata   sostenida (Acticoat-7, Actisorb Silver 220, Aquacel-Ag hydrofiber, Arglaes,   Silvasorb, Silveron) y soluciones coloidales de plata. Sin embargo, estos   tratamientos a pesar de controlar efectivamente las infecciones por   microorganismos, retrasan la cicatrizaci&oacute;n debido a su citotoxicidad (16).</p>     <p>En un intento por determinar el poder de cicatrizaci&oacute;n de algunos vendajes   t&oacute;picos basados en plata, se encuentra que retrasan el proceso e inhiben la   reepitelizaci&oacute;n de las heridas <i>in vitro </i>e <i>in vivo </i>(21). De igual   forma se utilizan biomateriales como TG-NF (Tegaderm-Nanofiber), el cual es un   copol&iacute;mero de poli-&epsilon; Caprolactona (PCL)/ gelatina tipo A / 2,2,2-Trifluoroetanol   (TFE) preparado en un mezcla al 10% (peso/volumen) PCL/TFE y 10% (p/v)   gelatina/TFE en proporciones de 50:50, el cual permiti&oacute; la reconstrucci&oacute;n del   estrato d&eacute;rmico poblado por fibroblastos (22). Oros autores emplearon suturas   recubiertas con triclos&aacute;n para compararlas con suturas est&aacute;ndar y encontraron   que hubo alta tasa de dehiscencia en las heridas con suturas recubiertas con   triclos&aacute;n. Para ello emplearon pacientes humanos a quienes se les practic&oacute;   reducci&oacute;n de mama, por lo que cada paciente fue su propio control, debido a que   utilizaron en un seno la sutura est&aacute;ndar y en el otro la sutura recubierta   (23).</p>     <p>Recientemente se utiliz&oacute; trombina en una aproximaci&oacute;n parenteral (con   inyecciones directas en las heridas) con un modelo animal <i>(in vivo) </i>y   herida incisional. La trombina se emple&oacute; unida a nanopart&iacute;cu-las de maghemita   (&gamma;-Fe2O3), y se encontr&oacute; que mejoraba la fuerza tensil en dichas heridas, en   comparaci&oacute;n con el grupo control (17). Por otro lado, en estudios en ratones   desnudos con heridas excisionales en la cabeza, fueron tratados con ves&iacute;culas   lip&iacute;dicas unilamelares, con un contenido de Magnesio-Adenosintrifosfato   (Mg-ATP), a una concentraci&oacute;n de 25 mM. Hallaron que los ratones tratados,   presentaron diferencias significativas en el tiempo de cicatrizaci&oacute;n respecto   del control (12 d&iacute;as Vs. 16 d&iacute;as). Igualmente, observaron que la expresi&oacute;n de   VEGF en el desarrollo del tejido de granulaci&oacute;n y la reepitalizaci&oacute;n fue m&aacute;s   alta en el grupo que recibi&oacute; el tratamiento con las ves&iacute;culas lip&iacute;dicas con   Mg-ATP (18). Se determina que la furosemida, aminofilina y acido asc&oacute;rbico,   pueden aumentar o disminuir el eflujo de iones, que generan corrientes   el&eacute;ctricas en las heridas, al acelerar o retrasar su cicatrizaci&oacute;n (14).</p>     <p>Uno de los hallazgos m&aacute;s extra&ntilde;os tiene como sustrato activo la   estreptolisina O, conocida exotoxina del estreptococo (24), que cuando se   modifica por oxidaci&oacute;n (ML-05) acelera el proceso de cicatrizaci&oacute;n e induce la   proliferaci&oacute;n y la migraci&oacute;n de los queratinocitos durante la reepitelizaci&oacute;n en   modelos <i>in vitro </i>(25).</p>     <p><b>B. Extractos naturales</b></p>     <p>En un meta-an&aacute;lisis (26), llegaron a la conclusi&oacute;n que el <i><u>Aloe vera</u> </i>puede ser una alternativa efectiva para el tratamiento de cicatrizaciones   por quemaduras de primero y segundo grado. Otro producto empleado en los   tratamientos por quemaduras es el ung&uuml;ento de quemaduras expuesto a humedad,   conocido como MEBO <b>(M</b>oist <b>E</b>xposed <b>B</b>urn <b>O</b>intment).   Este es un extracto de 6 hierbas (no referenciadas por los autores) que tiene   como ingrediente activo B-sitosterol en una base de cera y aceite de s&eacute;samo.   Dicho ung&uuml;ento disminuy&oacute; la p&eacute;rdida de agua transepitelial y aument&oacute;   transitoriamente la producci&oacute;n de algunos factores de crecimiento como bFGF,   TGF-P1 y NGF, en comparaci&oacute;n con pacientes tratados con sulfadiazina de plata   (27). Tambi&eacute;n se emplea el jugo de la pulpa de la hoja de dos plantas de aloe, <i><u>Aloe ferox</u> </i>Miller y <i><u>Aloe arborescens </u></i>Miller. Para el   estudio utilizaron modelos de heridas incisionales en ratas y conejos blancos de   nueva Zelanda. En ambos casos y para uno y otro modelo hubo diferencias   significativas en favor de los extractos acuosos de las plantas, ya que   exhibieron propiedades terap&eacute;uticas en t&eacute;rminos de inhibici&oacute;n antimicrobiana y   facilitaci&oacute;n del proceso de cicatrizaci&oacute;n, en comparaci&oacute;n con los grupos de   control (28).</p>     <p>Por otro lado, se encuentra que la utilizaci&oacute;n de dosis subcut&aacute;neas (0.03   -0.1 y 0.18 mg / kg) de <i><u>Aloe barbadensis </u></i>mejora significativamente   la cicatrizaci&oacute;n &oacute;sea <i>in vivo </i>(29). Los extractos hidrof&iacute;licos (a partir   de metanol) de las gl&aacute;ndulas rectales de grillos europeos <i>(<u>Gryllotalpa   gryllotalpa</u>) </i>y Chinos <i>(<u>Gryllotalpa africana</u>), </i>promueven la   r&aacute;pida reepitelizaci&oacute;n y neovascularizaci&oacute;n en heridas incisionales de rat&oacute;n.   Adem&aacute;s determinaron que el compuesto activo de esos extractos era &aacute;cido   linoleico metil-ester (30).</p>     <p>La utilizaci&oacute;n de extractos etan&oacute;licos de la corteza de la ra&iacute;z de algod&oacute;n de   seda <i>(<u>Calotropis gigantea</u>), </i>en modelos de heridas excisionales,   insicionales y modelo de espacio muerto, con el empleo como base de 100 g de   ung&uuml;ento BP <b>("B</b>e <b>P</b>repared"), al cual le a&ntilde;adieron 5 g del extracto   etan&oacute;lico, aceler&oacute; la progresi&oacute;n de la cicatrizaci&oacute;n en 12 d&iacute;as; aument&oacute; el   porcentaje de contracci&oacute;n y aceler&oacute; la reepitelizaci&oacute;n (22 a 18 d&iacute;as) de las   heridas excisionales. En las heridas incisionales, el tratamiento aument&oacute; la   resistencia a la ruptura de las heridas, y en heridas de espacio muerto aument&oacute;   la resistencia a la ruptura del granuloma (3). Igualmente, distintos autores   (31) intentan llevar a cabo ensayos con otras plantas. Aislaron de un extracto   acuoso de la corteza de <i><u>Mimosa tenuiflora</u> </i>(100 &micro;g / mL), en el   cual identificaron arabinogalactanos, y encontraron (en un modelo <i>in vitro </i>de cultivo de tejidos) una aparente interacci&oacute;n entre el arabinogalactano y   un aumento en la proliferaci&oacute;n de los fibroblastos. El uso de extractos   metan&oacute;licos y acuosos totales de la ra&iacute;z de la planta <i><u>Mimosa p&uacute;dica</u>, </i>fue evaluado en un modelo de herida excisional e incisional de ratas   albinas. Prepararon un ung&uuml;ento con ambos extractos al 0,5%, 1% y 2%. La &uacute;ltima   concentraci&oacute;n funcion&oacute; en la actividad cicatrizal de ambos modelos y aument&oacute; en   la fuerza tensil en el modelo incisional. Aparentemente los extractos contienen   un 11% (p/p) de fenoles para el extracto metan&oacute;lico y un 17% (p/p) para el   extracto acuoso (32).</p>     <p>Otros investigadores intentan no s&oacute;lo con soluciones t&oacute;picas, sino con   extractos proporcionados en dosis orales. Por ejemplo, determinaron que el   extracto alcoh&oacute;lico de <i>Echinacea pallida </i>acelera el proceso de   cicatrizaci&oacute;n en ratones estresados, a trav&eacute;s de dosis orales (130 mg / kg de   peso corporal) 3 d&iacute;as antes y 4 d&iacute;as despu&eacute;s de producir la herida (excisional).   Sin embargo, dichos extractos no mejoraron las heridas en ratones no estresados.   Adicionalmente, se evaluaron las concentraciones sangu&iacute;neas de corticosteroides,   para determinar si hab&iacute;a alguna correlaci&oacute;n entre la cicatrizaci&oacute;n en ratones   estresados y los niveles sangu&iacute;neos de los mismos. Al parecer, los mecanismos de   modulaci&oacute;n de la cicatrizaci&oacute;n por parte de estos extractos etan&oacute;licos son   diferentes, porque los niveles encontrados de corticosteroides no presentaron   diferencias significativas entre el grupo tratado y el control (33).</p>     <p>Otros ensayos m&aacute;s amplios, con extractos acuosos (etan&oacute;licos) de 12 plantas   brasileras, conocidas popularmente por su capacidad de reparaci&oacute;n tisular,   produjeron resultados positivos en t&eacute;rminos del tiempo de cicatrizaci&oacute;n. Las   plantas que generaron mejores efectos fueron <i><u>Galinsoga parviflora,   Petiveria alliacea, Schinus molle, Waltheria douradinha y Xanthium   cavanillesii</u>. </i>Adem&aacute;s, encontraron resultados positivos en la   cicatrizaci&oacute;n con la utilizaci&oacute;n de extractos oleosos de <i><u>Waltheria   douradinha</u>. </i>Los estudios sugieren que estas plantas inhiben prote&iacute;nas   como la p38alfa (prote&iacute;na cinasa, activada por mit&oacute;genos la cual desencadena   apoptosis). Otras inhibieron la uni&oacute;n de la prote&iacute;na NFkB (Factor Nuclear <i>kappa </i>B) (34), importante en la activaci&oacute;n de factores de crecimiento   relacionados con el proceso de cicatrizaci&oacute;n, principalmente genes de respuesta   a la inflamaci&oacute;n aguda o cr&oacute;nica (35,36). Igualmente, los extractos presentaron   actividad inhibitoria de la liberaci&oacute;n de TNFafa (Factor de Necrosis Tumoral <i>alfa), </i>el cual estimula la activaci&oacute;n de los receptores NF<i>k</i>B.   Todos los extractos presentaron en mayor o menor cuant&iacute;a, proliferaci&oacute;n y   movilizaci&oacute;n de fibroblastos. Por &uacute;ltimo, los extractos etan&oacute;licos utilizados   mostraron muy baja o ligera citotoxicidad, mientras que los extractos oleosos   exhibieron efectos citot&oacute;xicos a altas concentraciones (100 ug / mL).   Recientemente se utilizaron modelos incisionales y excisionales para ensayar   extractos oleosos y acuosos de hip&eacute;rico <i>(<u>Hipericum perforatum</u>) </i>y   encontraron actividad cicatrizante y antiinflamatoria, principalmente en los   extractos acuosos. Incluso una fracci&oacute;n de estos extractos etan&oacute;licos, fue   aislada con acetato de etilo y produjo los mejores resultados (37). La   composici&oacute;n qu&iacute;mica principal de dicho subextracto era de flavonoides y   naftoquinonas, antioxidantes especializados en el barrido de radicales libres en   las heridas (38).</p>     ]]></body>
<body><![CDATA[<p>El uso de un ung&uuml;ento de prop&oacute;leos en ratas macho adultas albinas, con un   modelo de herida excisional, estimul&oacute; la proliferaci&oacute;n de queratinocitos (con   una mejora de la reepitelizaci&oacute;n), alta reducci&oacute;n del &aacute;rea afectada, en   comparaci&oacute;n con el control. Adem&aacute;s, determinaron que la penetraci&oacute;n del mismo   ung&uuml;ento en la herida era profunda, lo cual permiti&oacute; llegar a la mayor&iacute;a de las   c&eacute;lulas implicadas en el proceso de cicatrizaci&oacute;n (39).</p>     <p><b>C. </b><b>Factores de crecimiento ex&oacute;genos</b></p>     <p>Estos factores pueden ser introducidos en las heridas en el proceso de   cicatrizaci&oacute;n, a partir de prote&iacute;nas recombinantes, empleadas de manera directa   en las heridas, a trav&eacute;s de dispositivos de liberaci&oacute;n lenta de los mismos o de   c&eacute;lulas trasformadas que producen elevados niveles de uno o varios factores de   crecimiento (40,41,42). Es el caso de la utilizaci&oacute;n de una formulaci&oacute;n de 10 &micro;L   de un dispositivo de PLAD <b>(P</b>oly<b>L</b>actic <b>A</b>cid <b>D</b>epot)   con 10 &micro;g de VEGF, aplicada en el sitio de una fractura femoral en ratones, lo   que mejor&oacute; la formaci&oacute;n neovascular, la osificaci&oacute;n, la maduraci&oacute;n del callo   &oacute;seo <i>in vivo </i>y adicionalmente aument&oacute; la actividad de los osteoblastos <i>in vitro </i>(40). Un ejemplo importante es la combinaci&oacute;n de un novedoso   biomaterial como la seda con EGF, los resultados fueron promisorios en cuanto al   tiempo de cicatrizaci&oacute;n y su uso en heridas cr&oacute;nicas no cicatrizadas (42).</p>     <p>La aplicaci&oacute;n t&oacute;pica de 10 ug de EGF rhesus (rhEGF)/g de ung&uuml;ento en un   modelo <i>in vivo, </i>promovi&oacute; la cicatrizaci&oacute;n al aumentar la tasa de   proliferaci&oacute;n epidermal, adem&aacute;s aceler&oacute; la contracci&oacute;n de la herida por la   proliferaci&oacute;n de miofibroblastos y la s&iacute;ntesis de col&aacute;geno (43). En un ensayo <i>in vivo </i>con pacientes humanos con &uacute;lceras cr&oacute;nicas por diabetes,   emplearon EGF de origen humano (hEGF) (0,04% p/p) en combinaci&oacute;n con actovegin   en crema (2 mg de derivado de sangre de ternero, 0,2 mg de cloruro de   benzalconio). Observaron que los pacientes tratados tuvieron una tasa de   cicatrizaci&oacute;n del 95% en comparaci&oacute;n con el 42 y el 57% para el tratamiento con   actovegin en crema al 5% y actovegin m&aacute;s 0,02% (p/p) de hEGF, respectivamente   (44).</p>     <p>A trav&eacute;s de inyecciones intrad&eacute;rmicas se trataron ratones con heridas   incisionales con 10 &micro;g de cDNA (ADN complementario) de HGF/cm de la herida; se   encontr&oacute; supresi&oacute;n de la apoptosis, cicatrizaci&oacute;n bien organizada con la   formaci&oacute;n de una escara peque&ntilde;a debido a su efecto antifibr&oacute;tico y la   regeneraci&oacute;n d&eacute;rmica (45). Heridas excisionales en ratones fueron tratadas con   aplicaciones t&oacute;picas de col&aacute;geno con NGF (1&micro;g / 1,2 mg de col&aacute;geno /   cm<sup>2</sup>), lo que acort&oacute; el tiempo de duraci&oacute;n de la cicatrizaci&oacute;n e   increment&oacute; la tasa de contracci&oacute;n de la herida (46).</p>     <p>El uso de inyecciones subcut&aacute;neas de VEGF (1 &micro;g/mL) en un modelo de heridas   isqu&eacute;micas, mejor&oacute; la neoangiog&eacute;nesis y la fuerza tensil de las heridas   cicatrizadas, en comparaci&oacute;n con el grupo control sin tratamiento (47).   Alternativamente, la transfecci&oacute;n liposomal de KGF en un modelo de quemadura   cut&aacute;nea en ratas, mejor&oacute; la regeneraci&oacute;n epidermal en un 170% y la deposici&oacute;n   del tejido de granulaci&oacute;n. En un modelo similar, generaron un aumento en la   concentraci&oacute;n de los factores IGF I, IGF-BP3, FGF y col&aacute;geno IV, adem&aacute;s de la   disminuci&oacute;n de TGF-&beta;, lo que aceler&oacute; el proceso de cicatrizaci&oacute;n, sin el aumento   del col&aacute;geno I o III (48,49).</p>     <p>En pacientes con quemaduras de un 15 a un 35% de extensi&oacute;n en la piel,   emplearon 30 ug de bFGF recombinante/6 cm<sup>2 </sup>de &aacute;rea por d&iacute;a, de manera   atomizada. Observaron el mejoramiento de la calidad cut&aacute;nea al menos en t&eacute;rminos   de dureza (50). Mientras que el uso de un extracto mitog&eacute;nico de suero de la   leche bovina, es correlacionado con el cierre r&aacute;pido de las heridas, en un   modelo de explantes fetales <i>in vitro </i>y de heridas incisionales <i>in vivo </i>(51). Dichos extractos de suero de leche bovino generalmente contienen   factores de crecimiento como el IGF-I, IGF-II, TGF-&beta;1, TGF-&beta;2, EGF, bFGF y PDGF,   los cuales son fundamentales en el proceso de cicatrizaci&oacute;n (52).</p>     <p><b><font size="3">Discusi&oacute;n</font></b></p>     <p>La cicatrizaci&oacute;n es un fen&oacute;meno complejo que depende de la interrelaci&oacute;n de   los elementos celulares que producen las prote&iacute;nas necesarias para la reacci&oacute;n   inflamatoria y la reparaci&oacute;n del tejido. Es imprescindible aclarar que se trata   de un proceso reparativo m&aacute;s no regenerativo como ocurre en el feto de cualquier   mam&iacute;fero. Esto genera una diferencia fundamental entre uno y otro, porque la   regeneraci&oacute;n estructural y funcional total del tejido se presenta solo durante   la cicatrizaci&oacute;n fetal. En el caso de la cicatrizaci&oacute;n en tejido adulto se   muestra una reparaci&oacute;n, en la cual no hay una regeneraci&oacute;n tisular completa; en   este caso, el organismo intenta reponer parte del tejido perdido por una   imitaci&oacute;n de la estructura y funcionalidad original, por lo que no son   regeneradas (2).</p>     <p>Con base en esto, los estudios intentan mejorar y optimizar el fen&oacute;meno de la   cicatrizaci&oacute;n en adultos, con el fin de acelerar el tiempo de reparaci&oacute;n y   evitar la aparici&oacute;n de procesos infecciosos secundarios o la cicatrizaci&oacute;n de   las heridas cr&oacute;nicas (10), sobre todo en pacientes con diabetes mellitus (53,   54, 55), cuyo proceso se ralentiza por esta patolog&iacute;a metab&oacute;lica. De tal modo   que los ensayos previamente mencionados, desde diferentes aproximaciones   terap&eacute;uticas son muy valiosos, en la b&uacute;squeda de un f&aacute;rmaco ideal para acelerar   los eventos y evitar al mismo tiempo la inflamaci&oacute;n y la proliferaci&oacute;n de   microorganismos.</p>     ]]></body>
<body><![CDATA[<p>En algunos de estos estudios se identifican los metabolitos secundarios   activos, que influyen directamente y de manera positiva en la estabilizaci&oacute;n y   aceleraci&oacute;n del proceso de cicatrizaci&oacute;n. Es el caso de metabolitos como el   arabionolactano (32), flavonoides y naftoquinonas (38), &aacute;cido linoleico   metil-ester (30) y &beta;-sitosterol (27). Sin embargo, la mayor&iacute;a de estas   investigaciones aleatorizadas emplearon solo extractos crudos (etan&oacute;licos o   metan&oacute;licos), como inicios de un proceso de identificaci&oacute;n del compuesto activo,   que podr&iacute;an ser aislados para la fabricaci&oacute;n de potenciales f&aacute;rmacos.</p>     <p>La ventaja de los estudios analizados para la presente revisi&oacute;n, fue el uso   de modelos animales (ratas) (28,32,39,48,49), los cuales permitieron conocer el   proceso de cicatrizaci&oacute;n en heridas incisionales (3, 28, 30, 37, 45, 51),   excisionales (3, 18, 37 y 46) y de espacio muerto (3). Esto admite determinar un   nivel de evidencia elevado (1a), porque los ensayos son aleatorizados y   homog&eacute;neos (68), por lo que la actividad de los extractos <i>in vivo </i>garantiza la calidad de la evidencia cient&iacute;fica, directamente aplicada en   seres vivos.</p>     <p>El uso de extractos de plantas medicinales utilizadas permanentemente por la   cultura popular (56, 57, 58), son el primer paso para el desarrollo de nuevas   tecnolog&iacute;as farmac&eacute;uticas; la utilizaci&oacute;n de vendajes o dispositivos con este   tipo de sustancias o con factores de crecimiento (43, 59, 60, 61), los ensayos   con trasplantes alog&eacute;nicos y aut&oacute;logos de c&eacute;lulas como queratinocitos o   fibroblastos (62, 63, 64), el uso de c&eacute;lulas madre (65, 66) y la controvertida   fototerapia (67), son posibles soluciones para reparar el tejido lesionado y   quiz&aacute;s regenerar parte de la estructura y la funcionalidad del mismo. Son   estrategias que aumentar&aacute;n progresivamente su utilizaci&oacute;n en quemaduras,   lesiones abrasivas abiertas por trauma e incluso heridas incisionales despu&eacute;s de   intervenciones quir&uacute;rgicas.</p>     <p>Lo que a la postre mejorar&aacute; la calidad y los tiempos de recuperaci&oacute;n de los   pacientes.</p>     <p><b><font size="3">REFERENCIAS</font></b></p>     <!-- ref --><p>1. Singer, A.J; Clark, R.A. <i>Cutaneous Wound Healing. </i>N. Eng. J. Med.   1999; 341: 738 - 746.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000068&pid=S0124-8146201000010000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. 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