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Effects of morphine, clonidine and papaverine on synaptosomal 45Ca uptake and antinociceptive action in rats


, : Effects of morphine, clonidine and papaverine on synaptosomal 45Ca uptake and antinociceptive action in rats. Japanese Journal of Pharmacology 34(1): 101-107

We studied the relationship between the inhibition of extracellular 45Ca2+ 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 [3H]-dihydromorphine binding to the membrane fraction from rat brain. Papaverine also inhibited the antinociceptive action induced by clonidine. Morphine inhibited the veratrine-stimulated synaptosomal 45Ca2+ uptake by a naloxone-reversible process. Papaverine also strongly inhibited the veratrine-stimulated synaptosomal 45Ca2+ uptake, while clonidine had virtually no effect. The inhibition of synaptosomal 45Ca2+ uptake induced by morphine was not increased by simultaneous addition of clonidine. The strong inhibitions of synaptosomal 45Ca2+ uptake were still observed by simultaneous addition of papaverine with morphine and clonidine.

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PMID: 6716713


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Peake, B.K.; Mackie, A.E.; Sivasithamparam, K.; Habili, N.; McKirdy, S.J., 2004: First report of grapevine leafroll associated virus 9 (GLRaV-9) in Western Australia. Grapevine leafroll associated virus 9 (GLRaV-9) was detected by polymerase chain reaction in a Cabernet Franc sample collected from a vineyard in the Margaret River region of Western Australia. This represents the first detection of this virus in...

Delgado, N.; Briones, L.; Gallo, G.; Grazia Caletti, M.; Vallejo, G.; Mendilaharzu, F., 1987: Diagnosis and follow-up of 42 pediatric cases of membranoproliferative glomerulonephritis. Medicina 47(3): 225-233

Kohn, J., 1968: An immunochromatographic technique. Immunology 15(6): 863-865

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Iakovlev, S.I.; Dorofeev, G.I.; Onikienko, B.A.; Polunova, E.N., 1961: Clinical aspects and remote results of treatment of acute poisoning with methyl alcohol. Voenno-Meditsinskii Zhurnal 3: 40-44

Ovchinnikova, O.S.; Kertesz, V.; Van Berkel, G.J., 2011: Combining laser ablation/liquid phase collection surface sampling and high-performance liquid chromatography-electrospray ionization-mass spectrometry. This letter describes the coupling of ambient pressure transmission geometry laser ablation with a liquid phase sample collection method for surface sampling and ionization with subsequent mass spectral analysis. A commercially available autosampl...

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