<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2010000400009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Synthesis and Antithyroid Activity of Some 8-Substituted Purine Derivatives]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fatima]]></surname>
<given-names><![CDATA[Ismat]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Munawar]]></surname>
<given-names><![CDATA[Munawar A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tasneem]]></surname>
<given-names><![CDATA[Affia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of the Punjab Institute of Chemistry ]]></institution>
<addr-line><![CDATA[Lahore ]]></addr-line>
<country>Pakistan</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Centre for Nuclear Medicine Mayo Hospital ]]></institution>
<addr-line><![CDATA[Lahore ]]></addr-line>
<country>Pakistan</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>54</volume>
<numero>4</numero>
<fpage>227</fpage>
<lpage>232</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Some novel as well as known derivatives of 8-sulfanyl-3,9-dihydro-1H-purine-2,6-dione were synthesized and their antithyroid activity was measured in rats after administration of a daily dose of 20mg/kg via i.p. injection for 15 days. Free thyroxine and triiodothyronine concentrations were determined using radioimmunoassay technique. The assay results showed decrease in the hormonal concentrations for the animals treated with these compounds as compared to the control animals. Similarly, thyroid stimulating hormone level was measured with ELISA method and the results demonstrated a comparative increase of this hormone for the treated animals. The hormonal variations indicated significant (&#945;<0.05) activity of the compounds. Histological study of thyroid tissues from the test animals showed cellular modifications in the treated animals like cylindrical shape of follicular epithelium, depletion of colloid and high values of thyroid body indices. All these factors further confirmed the antithyroid effects of the compounds under study.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se sintetizaron algunos derivados nuevos y ya conocidos de la 8-sulfanil-3,9-dihidro-1H-purin-2,6-diona, y se determinó su actividad antitiroidea en ratas, tras la administración de una dosis diaria de 20 mg/kg a través de inyección intraperitoneal durante 15 días. Las concentraciones de tiroxina y triyodotironina libres se determinaron utilizando la técnica de radioinmunoensayo. Los resultados de los ensayos mostraron una disminución en las concentraciones hormonales de los animales tratados con estos compuestos en comparación con los animales control. Del mismo modo, el nivel de la hormona estimulante de la tiroides se midió con el método ELISA y los resultados demostraron un aumento comparativo de esta hormona en los animales tratados. Las variaciones hormonales indicaron actividad significativa (&#945; < 0.05) de los compuestos. El estudio histológico de los tejidos de la tiroides de los animales de laboratorio mostró cambios celulares en los animales tratados, tales como la forma cilíndrica del epitelio folicular, la reducción en los valores de coloide y elevación de los índices del cuerpo tiroideo. Todos estos factores confirman también los efectos antitiroideos de los compuestos en estudio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[8-sulfanyl-3,9-dihydro-1H-purine-2,6-dione]]></kwd>
<kwd lng="en"><![CDATA[derivatives]]></kwd>
<kwd lng="en"><![CDATA[antithyroid activity]]></kwd>
<kwd lng="en"><![CDATA[thyroid hormones]]></kwd>
<kwd lng="en"><![CDATA[histology]]></kwd>
<kwd lng="es"><![CDATA[8-Sulfanil-3,9-dihidro-1H-purin-2,6-dione]]></kwd>
<kwd lng="es"><![CDATA[derivados]]></kwd>
<kwd lng="es"><![CDATA[actividad antitiroidea]]></kwd>
<kwd lng="es"><![CDATA[hormonas tiroideas]]></kwd>
<kwd lng="es"><![CDATA[histología]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Synthesis and Antithyroid Activity of Some 8&#150;Substituted Purine Derivatives</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Ismat Fatima,<sup>1</sup> Munawar A. Munawar<sup>1</sup>* and Affia Tasneem<sup>2</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Institute of Chemistry, University of the Punjab, Lahore&#150;Pakistan.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> CENUM, Mayo Hospital, Lahore&#150;Pakistan.</i> <a href="mailto:mamunawar@chem.pu.edu.pk">mamunawar@chem.pu.edu.pk</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received August 6, 2010.    ]]></body>
<body><![CDATA[<br> Accepted September 9, 2010.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Some novel as well as known derivatives of 8&#150;sulfanyl&#150;3,9&#150;dihydro&#150;1<i>H</i>&#150;purine&#150;2,6&#150;dione were synthesized and their antithyroid activity was measured in rats after administration of a daily dose of 20mg/kg via <i>i.p. </i>injection for 15 days. Free thyroxine and triiodothyronine concentrations were determined using radioimmunoassay technique. The assay results showed decrease in the hormonal concentrations for the animals treated with these compounds as compared to the control animals. Similarly, thyroid stimulating hormone level was measured with ELISA method and the results demonstrated a comparative increase of this hormone for the treated animals. The hormonal variations indicated significant (&#945;<u>&lt;</u>0.05) activity of the compounds. Histological study of thyroid tissues from the test animals showed cellular modifications in the treated animals like cylindrical shape of follicular epithelium, depletion of colloid and high values of thyroid body indices. All these factors further confirmed the antithyroid effects of the compounds under study.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>8&#150;sulfanyl&#150;3,9&#150;dihydro&#150;1<i>H</i>&#150;purine&#150;2,6&#150;dione, derivatives, antithyroid activity, thyroid hormones, histology.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se sintetizaron algunos derivados nuevos y ya conocidos de la 8&#150;sulfanil&#150;3,9&#150;dihidro&#150;1<i>H</i>&#150;purin&#150;2,6&#150;diona, y se determin&oacute; su actividad antitiroidea en ratas, tras la administraci&oacute;n de una dosis diaria de 20 mg/kg a trav&eacute;s de inyecci&oacute;n intraperitoneal durante 15 d&iacute;as. Las concentraciones de tiroxina y triyodotironina libres se determinaron utilizando la t&eacute;cnica de radioinmunoensayo. Los resultados de los ensayos mostraron una disminuci&oacute;n en las concentraciones hormonales de los animales tratados con estos compuestos en comparaci&oacute;n con los animales control. Del mismo modo, el nivel de la hormona estimulante de la tiroides se midi&oacute; con el m&eacute;todo ELISA y los resultados demostraron un aumento comparativo de esta hormona en los animales tratados. Las variaciones hormonales indicaron actividad significativa (&#945; <u>&lt;</u> 0.05) de los compuestos. El estudio histol&oacute;gico de los tejidos de la tiroides de los animales de laboratorio mostr&oacute; cambios celulares en los animales tratados, tales como la forma cil&iacute;ndrica del epitelio folicular, la reducci&oacute;n en los valores de coloide y elevaci&oacute;n de los &iacute;ndices del cuerpo tiroideo. Todos estos factores confirman tambi&eacute;n los efectos antitiroideos de los compuestos en estudio. </font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>8&#150;Sulfanil&#150;3,9&#150;dihidro&#150;1<i>H</i>&#150;purin&#150;2,6&#150;dione, derivados, actividad antitiroidea, hormonas tiroideas, histolog&iacute;a.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
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