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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The effects of calcium channel inhibitors and other procedures affecting calcium translocation on drug-induced rhythmic contractions in the rat vas deferens.</title><author><name sortKey="Hay, D W" sort="Hay, D W" uniqKey="Hay D" first="D. W." last="Hay">D. W. Hay</name></author><author><name sortKey="Wadsworth, R M" sort="Wadsworth, R M" uniqKey="Wadsworth R" first="R. M." last="Wadsworth">R. M. Wadsworth</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">6652333</idno><idno type="pmc">2044875</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2044875</idno><idno type="RBID">PMC:2044875</idno><date when="1983">1983</date><idno type="wicri:Area/Pmc/Corpus">000141</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000141</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The effects of calcium channel inhibitors and other procedures affecting calcium translocation on drug-induced rhythmic contractions in the rat vas deferens.</title><author><name sortKey="Hay, D W" sort="Hay, D W" uniqKey="Hay D" first="D. W." last="Hay">D. W. Hay</name></author><author><name sortKey="Wadsworth, R M" sort="Wadsworth, R M" uniqKey="Wadsworth R" first="R. M." last="Wadsworth">R. M. Wadsworth</name></author></analytic><series><title level="j">British Journal of Pharmacology</title><idno type="ISSN">0007-1188</idno><imprint><date when="1983">1983</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In the rat isolated vas deferens, methoxamine 8.1 microM produced an initial phasic response that declined towards baseline and was followed by rhythmic contractions that continued until wash-out. These responses were predominant in the epididymal half. BaCl2 1 mM produced a similar type of response which was not mediated by noradrenaline release or activation of alpha-adrenoceptors. The barium responses were similar in the epididymal and prostatic halves. Incubation in nominally Ca2+-free solution caused abolition or near abolition of rhythmic contractions produced by barium or methoxamine. The initial phasic response to methoxamine was abolished in Ca2+-free solution, whereas that produced by barium persisted. Rhythmic contractions produced by methoxamine or barium were inhibited by Mg2+ (2.4-20 mM) and by La3+ (1-5 mM). Mg2+ had selectivity for inhibition of the frequency of methoxamine- but not barium-induced rhythmic contractions. Despite their dependence on [Ca2+]o, barium- and methoxamine-induced rhythmic contractions were resistant to inhibition by calcium channel inhibitors. Verapamil, nifedipine and flunarazine inhibited the amplitude of rhythmic contractions more readily than the frequency (methoxamine IC50 for verapamil: amplitude = 29.8 +/- 5.40 microM, n = 6, frequency = 96.7 +/- 31.0 microM, n = 5, for nifedipine: amplitude = 2.42 +/- 0.34 microM, n = 7, frequency = 3.24 +/- 0.75 microM, n = 7, and for flunarizine: amplitude = 15.9 +/- 5.95 microM, n = 7, frequency = 153 +/- 28.6 microM, n = 7). There was no differentiation between inhibition of methoxamine and barium-induced responses. Like Mg2+, methoxyverapamil selectively inhibited the frequency of methoxamine-induced contractions (IC50: amplitude = 16.8 +/- 2.86 microM, n = 5, frequency = 2.07 +/- 0.81 microM, n = 5) but not barium-induced contractions (IC50: amplitude = 13.9 +/- 1.95 microM, n = 5, frequency = 48.5 +/- 8.98 microM, n = 5). Diazoxide (43.3-2167 microM) and nitroprusside (3.36-6712 microM) had only a small effect on barium contractions, but produced a dose-related reduction in the amplitude of methoxamine-induced responses. Diazoxide and nitroprusside caused methoxamine contractions to occur in groups, although they had no effect on their overall frequency. It is concluded that barium- and methoxamine-induced rhythmic contractions in the rat vas deferens are mediated by the entry of [Ca2+]o via membrane calcium channels that have a lower affinity (10-100 X) for calcium channel inhibitors than those mediating the KCl response.(ABSTRACT TRUNCATED AT 400 WORDS)</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Br J Pharmacol</journal-id><journal-id journal-id-type="pmc">brjpharm</journal-id><journal-title>British Journal of Pharmacology</journal-title><issn pub-type="ppub">0007-1188</issn><publisher><publisher-name>Nature Publishing Group</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">6652333</article-id><article-id pub-id-type="pmc">2044875</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>The effects of calcium channel inhibitors and other procedures affecting calcium translocation on drug-induced rhythmic contractions in the rat vas deferens.</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Hay</surname><given-names>D. W.</given-names></name></contrib><contrib contrib-type="author"><name><surname>Wadsworth</surname><given-names>R. M.</given-names></name></contrib></contrib-group><pub-date pub-type="ppub"><month>6</month><year>1983</year></pub-date><volume>79</volume><issue>2</issue><fpage>347</fpage><lpage>362</lpage><abstract><p>In the rat isolated vas deferens, methoxamine 8.1 microM produced an initial phasic response that declined towards baseline and was followed by rhythmic contractions that continued until wash-out. These responses were predominant in the epididymal half. BaCl2 1 mM produced a similar type of response which was not mediated by noradrenaline release or activation of alpha-adrenoceptors. The barium responses were similar in the epididymal and prostatic halves. Incubation in nominally Ca2+-free solution caused abolition or near abolition of rhythmic contractions produced by barium or methoxamine. The initial phasic response to methoxamine was abolished in Ca2+-free solution, whereas that produced by barium persisted. Rhythmic contractions produced by methoxamine or barium were inhibited by Mg2+ (2.4-20 mM) and by La3+ (1-5 mM). Mg2+ had selectivity for inhibition of the frequency of methoxamine- but not barium-induced rhythmic contractions. Despite their dependence on [Ca2+]o, barium- and methoxamine-induced rhythmic contractions were resistant to inhibition by calcium channel inhibitors. Verapamil, nifedipine and flunarazine inhibited the amplitude of rhythmic contractions more readily than the frequency (methoxamine IC50 for verapamil: amplitude = 29.8 +/- 5.40 microM, n = 6, frequency = 96.7 +/- 31.0 microM, n = 5, for nifedipine: amplitude = 2.42 +/- 0.34 microM, n = 7, frequency = 3.24 +/- 0.75 microM, n = 7, and for flunarizine: amplitude = 15.9 +/- 5.95 microM, n = 7, frequency = 153 +/- 28.6 microM, n = 7). There was no differentiation between inhibition of methoxamine and barium-induced responses. Like Mg2+, methoxyverapamil selectively inhibited the frequency of methoxamine-induced contractions (IC50: amplitude = 16.8 +/- 2.86 microM, n = 5, frequency = 2.07 +/- 0.81 microM, n = 5) but not barium-induced contractions (IC50: amplitude = 13.9 +/- 1.95 microM, n = 5, frequency = 48.5 +/- 8.98 microM, n = 5). Diazoxide (43.3-2167 microM) and nitroprusside (3.36-6712 microM) had only a small effect on barium contractions, but produced a dose-related reduction in the amplitude of methoxamine-induced responses. Diazoxide and nitroprusside caused methoxamine contractions to occur in groups, although they had no effect on their overall frequency. It is concluded that barium- and methoxamine-induced rhythmic contractions in the rat vas deferens are mediated by the entry of [Ca2+]o via membrane calcium channels that have a lower affinity (10-100 X) for calcium channel inhibitors than those mediating the KCl response.(ABSTRACT TRUNCATED AT 400 WORDS)</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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