Effects of Morphine, Clonidine and Papaverine on Synaptosomal <SUP>45</SUP>Ca Uptake and Antinociceptive Action in Rats
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概要
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We studied the relationship between the inhibition of extracellular <SUP>45</SUP>Ca<SUP>2+</SUP> uptake into synaptosomes and the antinociceptive action induced by morphine, clonidine and papaverine in rats. The antinociceptive action induced by clonidine was as potent as that by morphine, but that by papaverine was less potent than those by morphine and clonidine. Antinociceptive action by morphine was considerably potentiated by the simultaneous administration of clonidine. However, the antinociceptive actions induced by morphine and clonidine were found to be mediated through different receptor mechanisms. Although the pretreatment by papaverine blocked the morphine-induced antinociception, the inhibition induced by papaverine was not found to be mediated through the opiate receptor because papaverine did not displace [<SUP>3</SUP>H]-dihydromorphine binding to the membrane fraction from rat brain. Papaverine also inhibited the antinociceptive action induced by clonidine. Morphine inhibited the veratrine-stimulated synaptosomal <SUP>45</SUP>Ca<SUP>2+</SUP> uptake by a naloxone-reversible process. Papaverine also strongly inhibited the veratrine-stimulated synaptosomal <SUP>45</SUP>Ca<SUP>2+</SUP> uptake, while clonidine had virtually no effect. The inhibition of synaptosomal <SUP>45</SUP>Ca<SUP>2+</SUP> uptake induced by morphine was not increased by simultaneous addition of clonidine. The strong inhibitions of synaptosomal <SUP>45</SUP>Ca<SUP>2+</SUP> uptake were still observed by simultaneous addition of papaverine with morphine and clonidine. These results suggest that it is difficult to account for the drugs-induced antinociception by the inhibition of extracellular Ca<SUP>2+</SUP> uptake into the synaptosomes only because papaverine inhibits the manifestation of the antiociceptive actions induced by morphine and clonidine mediated through mechanisms other than the inhibition of extracellular <SUP>45</SUP>Ca<SUP>2+</SUP> uptake into the synaptosomes.
著者
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Takayanagi Issei
Department Of Chemical Pharmacology Faculty Of Pharmaceutical Sciences University Of Tokyo:(correspo
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KONNO FUKIO
Department of Biology, Faculty of Science, Kobe University
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