<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932017000200160</article-id>
<article-id pub-id-type="doi">10.17533/udea.iatreia.v30n2a05</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mechanisms of skin aging]]></article-title>
<article-title xml:lang="es"><![CDATA[Mecanismos de envejecimiento de la piel]]></article-title>
<article-title xml:lang="pt"><![CDATA[Mecanismos de envelhecimento da pele]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mesa-Arango]]></surname>
<given-names><![CDATA[Ana Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flórez-Muñoz]]></surname>
<given-names><![CDATA[Sindy Viviana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanclemente]]></surname>
<given-names><![CDATA[Gloria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>160</fpage>
<lpage>170</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932017000200160&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932017000200160&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932017000200160&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Skin aging is an inevitable biological phenomenon of human life that results from either the age-dependent decline of cell function (intrinsic aging) or from cumulative exposure to external harmful influences (extrinsic aging). Intrinsic and extrinsic factors act synergistically to induce skin changes that manifest clinically as burns, erythema, hyperpigmentation, telangiectasia, skin dryness or sagging, coarse wrinkles, skin texture changes or eventually as skin cancer. The molecular mechanisms of both types of skin aging are similar. This review focuses on intrinsic and extrinsic mechanisms of skin aging, and on current and new perspectives for prevention and treatment options extracted from natural products.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El envejecimiento cutáneo es un fenómeno biológico inevitable y puede ser el resultado de la disminución de la función celular como consecuencia del proceso normal de envejecimiento (envejecimiento intrínseco) o de la acumulación de los efectos dañinos debido a la exposición a factores nocivos externos (envejecimiento extrínseco). Los factores intrínsecos y extrínsecos actúan sinérgicamente para inducir cambios en la piel que se manifiestan clínicamente como quemaduras, eritema, hiperpigmentación, telangiectasias, sequedad de la piel o flacidez, arrugas profundas, cambios de textura o cáncer de piel. Los mecanismos moleculares de ambos tipos de envejecimiento de la piel son similares. Esta revisión se centra en una descripción general de los principales mecanismos intrínsecos y extrínsecos del envejecimiento de la piel así como en las medidas actuales de fotoprotección y en las nuevas perspectivas en cuanto a la prevención y al tratamiento basados en productos naturales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO O envelhecimento cutâneo e um fenômeno biológico inevitável e pode ser o resultado da diminuição da função celular como consequência do processo normal do envelhecimento (envelhecimento intrínseco) ou do cúmulo dos efeitos daninhos devido à exposição com fatores nocivos externos (envelhecimento extrínseco). Os fatores intrínsecos e extrínsecos atuam sinergicamente para induzir mudanças na pele, que clinicamente manifestam-se como queimaduras, eritema, hiperpigmentação, telangiectasias, pele seca, rugas profundas, perda da tonalidade natural ou câncer de pele. Os mecanismos moleculares dos dois tipos de envelhecimento são similares. Esta revisão, centra-se na descrição geral dos principais mecanismos intrínsecos e extrínsecos do envelhecimento da pele, assim como nas medidas atuais de foto proteção e nas perspectivas referentes à prevenção e tratamento baseados no uso de produtos naturais.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[DNA Damage]]></kwd>
<kwd lng="en"><![CDATA[Natural Products]]></kwd>
<kwd lng="en"><![CDATA[Photoaging]]></kwd>
<kwd lng="en"><![CDATA[Photoprotection]]></kwd>
<kwd lng="en"><![CDATA[Reactive Oxygen Species (ROS)]]></kwd>
<kwd lng="en"><![CDATA[Ultraviolet Radiation (UV)]]></kwd>
<kwd lng="es"><![CDATA[Daño del ADN]]></kwd>
<kwd lng="es"><![CDATA[Especies de Oxígeno Reactivas (EOR)]]></kwd>
<kwd lng="es"><![CDATA[Fotoenvejecimiento]]></kwd>
<kwd lng="es"><![CDATA[Fotoprotección]]></kwd>
<kwd lng="es"><![CDATA[Productos Naturales]]></kwd>
<kwd lng="es"><![CDATA[Radiación Ultravioleta (UV)]]></kwd>
<kwd lng="pt"><![CDATA[Dano do ADN]]></kwd>
<kwd lng="pt"><![CDATA[Espécies Reativas de Oxigênio (ERO)]]></kwd>
<kwd lng="pt"><![CDATA[Foto Envelhecimento]]></kwd>
<kwd lng="pt"><![CDATA[Foto Proteção]]></kwd>
<kwd lng="pt"><![CDATA[Produtos Naturais]]></kwd>
<kwd lng="pt"><![CDATA[Radiação Ultravioleta (UV)]]></kwd>
</kwd-group>
</article-meta>
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