<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442020000300884</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v68i3.39503</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Essential oil composition and cytotoxic activity in twospecies ofthe plant genus Vismia (Hypericaceae) from the Venezuelan Andes]]></article-title>
<article-title xml:lang="es"><![CDATA[Composición de aceites esenciales y actividad citotóxica en dos especies de plantas del género Vismia (Hypericaceae) de los Andes venezolanos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Vera]]></surname>
<given-names><![CDATA[Janne]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrago-Díaz]]></surname>
<given-names><![CDATA[Alexis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arvelo]]></surname>
<given-names><![CDATA[Francisco-A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sojo]]></surname>
<given-names><![CDATA[Felipe-J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suarez]]></surname>
<given-names><![CDATA[Alírica-I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Los Andes Faculty of Pharmacy and Bioanalysi ]]></institution>
<addr-line><![CDATA[ Mérida]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Los Andes Faculty of Pharmacy and Bioanalysis ]]></institution>
<addr-line><![CDATA[ Mérida]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Foundation of Advanced Studies Institute Bioscience Center ]]></institution>
<addr-line><![CDATA[ Miranda]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Central University of Venezuela Experimental Biology Institute ]]></institution>
<addr-line><![CDATA[ Caracas]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Central University of Venezuela Faculty of Pharmacy ]]></institution>
<addr-line><![CDATA[ Caracas]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,University of Los Andes Faculty of Pharmacy and Bioanalysis ]]></institution>
<addr-line><![CDATA[ Mérida]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>68</volume>
<numero>3</numero>
<fpage>884</fpage>
<lpage>891</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442020000300884&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442020000300884&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442020000300884&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The Vismia genus belongs to the Hypericaceae family and comprises around 57 species of which 17 have been located in Venezuela. Previous investigations have been carried out in extracts as well as pure isolated compounds, revealing antimicrobial, antioxidant and anti-HIV, among other, biological activities.  Objective:  This investigation aims to determine the cytotoxic activity of essential oils from leaves of Vismia baccifera Triana &amp; Planch (VBJ and VBV) and Vismia macrophylla Kunth (VM) collected in three different locations of the Venezuelan Andean region.  Methods: Essential oils obtained by hydrodistillation were analyzed using gas chromatography-mass spectrometry (GC-MS) and their cytotoxic activity was analyzed following the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay. Human tumor cell lines from SKBr3, MCF-7 and PANC-1, two breast carcinomas and one pancreatic adenocarcinoma of ductal type, were tested with the oil samples and human dermis fibroblasts were used as non-tumor cells.  Results: &#946;-caryophyllene and trans-caryophyllene were present as major components in VBJ and VBV, respectively, while &#947;-bisabolene was the main component in the VM sample. Anticancer activity was observed on V. baccifera essential oil against SKBr3, MCF-7 and PANC-1. The selectivity index showed that VBV is highly selective against the SKBr3 cell line and has no activity against non-tumor cells.  Conclusions:  These results are considered a contribution to natural products research and may provide supportive data for future studies on cancer.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El género Vismia pertenece a la familia Hypericaceae y comprende alrededor de 57 especies de las cuales 17 han sido ubicadas en Venezuela. Se han realizado investigaciones previas tanto en extractos como en compuestos puros aislados revelando actividad antimicrobiana, antioxidante y anti-VIH, entre otras actividades biológicas.  Objetivo:  El propósito de esta investigación es determinar la actividad citotóxica de los aceites esenciales de las hojas de Vismia baccifera Triana &amp; Planch (VBJ y VBV) y Vismia macrophylla Kunth (VM) recolectadas en tres localidades de la región andina venezolana.  Métodos:  Aceites esenciales obtenidos por hidrodestilación fueron analizados por cromatografía de gases-espectrometría de masas y su actividad citotóxica fue analizada siguiendo el método MTT (bromuro de 3-[4,5-dimetiltiazol-2-il]-2,5-difeniltetrazolio). Los aceites esenciales fueron ensayados frente a células tumorales humanas SKBr3, MCF-7 y PANC-1, dos carcinomas de mama y un adenocarcinoma pancreático del tipo ductal, usando cultivos primarios de fibroblastos de dermis humana como células no tumorales.  Resultados: &#946;-cariofileno y trans-cariofileno estuvieron presentes como compuestos mayoritarios en VBJ y VBV, respectivamente, mientras que &#947;-bisaboleno fue el componente principal en la muestra VM. El aceite esencial de V. baccifera mostró actividad anticancerígena frente a SKBr3, MCF-7 y PANC-1. El índice de selectividad reveló que VBV es altamente selectivo frente a la línea celular SKBr3 y no presenta actividad contra las células no tumorales.  Conclusiones:  Estos resultados se consideran una contribución a la investigación de los productos naturales y los datos pueden ser de utilidad en futuras investigaciones sobre el cáncer.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[fibroblasts]]></kwd>
<kwd lng="en"><![CDATA[&#946;-caryophyllene]]></kwd>
<kwd lng="en"><![CDATA[&#947;-bisabolene]]></kwd>
<kwd lng="en"><![CDATA[MTT]]></kwd>
<kwd lng="en"><![CDATA[MCF-7]]></kwd>
<kwd lng="en"><![CDATA[PANC-1]]></kwd>
<kwd lng="en"><![CDATA[SKBr3]]></kwd>
<kwd lng="es"><![CDATA[fibroblastos]]></kwd>
<kwd lng="es"><![CDATA[&#946;-cariofileno]]></kwd>
<kwd lng="es"><![CDATA[&#947;-bisaboleno]]></kwd>
<kwd lng="es"><![CDATA[MTT]]></kwd>
<kwd lng="es"><![CDATA[MCF-7]]></kwd>
<kwd lng="es"><![CDATA[PANC-1]]></kwd>
<kwd lng="es"><![CDATA[SKBr3]]></kwd>
</kwd-group>
</article-meta>
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