<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992022000100115</article-id>
<article-id pub-id-type="doi">10.20937/rica.54038</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EFECTO DEL 17&#945;-ETINILESTRADIOL (EE2) COMO PERTURBADOR ENDÓCRINO REPRODUCTIVO EN EL PEZ Aequidens metae]]></article-title>
<article-title xml:lang="en"><![CDATA[EFFECT OF 17&#945;-ETHINYLESTRADIOL (EE2) AS A REPRODUCTIVE ENDOCRINE DISRUPTOR IN THE FISH Aequidens metae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PahÍ-Rosero]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-Santamaría]]></surname>
<given-names><![CDATA[Yohana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de los Llanos Facultad de Ciencias Agropecuarias y Recursos Naturales ]]></institution>
<addr-line><![CDATA[Villavicencio Meta]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de los Llanos Facultad de Ciencias Agropecuarias y Recursos Naturales Escuela de Ciencias Animales]]></institution>
<addr-line><![CDATA[Villavicencio Meta]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>38</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992022000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992022000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992022000100115&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El 17&#945;-etinilestradiol (EE2) es un esteroide sintético que interfiere en el sistema endócrino reproductivo de los peces. En este estudio se evaluó el efecto del EE2 como posible perturbador endócrino en hembras y en machos adultos de Aequidens metae expuestos a 0.5, 5, 50 y 250 ng/L por 21 días. Se incluyó un testigo negativo (C) y un testigo con solvente (etanol) (CE). Finalizada la exposición al EE2, la sangre fue colectada para determinar calcio y fósforo plasmático y en las gónadas e hígado se evaluaron los índices somáticos y las alteraciones histológicas. Los índices gonadosomático y hepatosomático no presentaron diferencias significativas. A nivel histológico, en los ovarios se encontró congestión, fibrosis intersticial, apoptosis, atresia y material vitelogénico. A nivel testicular, se observó acumulación de material de melanomacrófagos, degeneración testicular, fibrosis intersticial, atrofia y engrosamiento de la pared intersticial. Y en hígado, en ambos sexos, se observó mayor picnosis degenerativa, activación de macrófagos, apoptosis, infiltraciones, dilatación y congestión, en comparación con los grupos testigo. Las hembras no presentaron diferencias significativas en calcio y fósforo plasmático. Los machos expuestos a las tres concentraciones más altas tuvieron valores significativamente mayores en el calcio plasmático en comparación con el grupo testigo. Con respecto al fósforo plasmático, en los machos expuestos a 250 ng/L se presentaron diferencias en comparación con el grupo testigo. Estos resultados permiten inferir que esta especie es sensible a los efectos de la perturbación endocrina generados por el EE2, y que la determinación de parámetros bioquímicos como los iones de calcio y fósforo pueden ser usados como biomarcadores adicionales del estado de salud de los peces expuestos a xenobióticos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The 17&#945;-ethinylestradiol (EE2) is a synthetic steroid that interferes with the reproductive endocrine system of fish. This study evaluated the effect of EE2 as a possible endocrine disruptor in adult Aequidens metae females and males exposed to 0.5, 5, 50, and 250 ng/L for 21 days. Negative control and solvent control (ethanol) were included. After exposure, blood was collected to determine plasma calcium and phosphorus, and somatic indices and histology changes were evaluated in the gonads and liver. The gonadosomatic and hepatosomatic indices did not present significant differences. At histological level, congestion, interstitial fibrosis, apoptosis, atresia, and vitellogenic material were found in the ovary. At the testicular level, accumulation of melanomacrophage material, testicular degeneration, interstitial fibrosis, atrophy and thickening of the interstitial wall were observed. In the liver, in both sexes, was observed greater degenerative pyknosis, activation of macrophages, apoptosis, infiltrations, dilatation and congestion compared with the control groups. Females did not show significant differences in plasma calcium and phosphorus between treatments. The males exposed to the three highest EE2 concentrations had significantly higher values in plasma calcium compared to control group. Regarding plasma phosphorus, in males exposed to 250 ng/L there were differences compared to control groups. The results allow inferring that this species is sensitive to endocrine disruption effects generated by EE2 and that the determination of biochemical parameters such as plasma calcium and phosphorus ions can be used as additional biomarkers of the health status of fish exposed to xenobiotics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biomarcador]]></kwd>
<kwd lng="es"><![CDATA[estrógenos]]></kwd>
<kwd lng="es"><![CDATA[histopatología]]></kwd>
<kwd lng="es"><![CDATA[peces nativos]]></kwd>
<kwd lng="es"><![CDATA[ecotoxicología]]></kwd>
<kwd lng="en"><![CDATA[biomarker]]></kwd>
<kwd lng="en"><![CDATA[estrogens]]></kwd>
<kwd lng="en"><![CDATA[histopathology]]></kwd>
<kwd lng="en"><![CDATA[native fish]]></kwd>
<kwd lng="en"><![CDATA[ecotoxicology]]></kwd>
</kwd-group>
</article-meta>
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