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- W2090693732 abstract "The effects of two organic Ca2+ antagonists (verapamil and nitrendipine) and of two inorganic Ca2+ channel blockers (Co2+ and ruthenium red) on the Na+-dependent release of gamma-amino-n-butyric acid (GABA) triggered by veratrine and monensin in the absence of external Ca2+ were studied in mouse brain synaptosomes. Ca2+-independent release of GABA stimulated by the Na+ channel activator veratrine was inhibited with micromolar concentrations of verapamil and nitrendipine. In contrast, GABA release induced by the Na+ ionophore monensin was insensitive to the organic Ca2+ antagonists. Verapamil also failed to modify A23187-stimulated release of GABA in the presence of Ca2+ but inhibited high K+-induced release of the transmitter. Co2+ partially diminished veratrine-induced release but did not change monensin-induced release. Releasing responses to monensin and veratrine were insensitive to ruthenium red, which inhibited the Ca2+-dependent component of GABA release evoked by high K+ depolarization. These data demonstrate that the mechanism of inducing GABA release is different for veratrine and monensin, as evidenced by their differing sensitivities to inhibition by Ca2+ channel antagonists and organic Ca2+ blockers. It is concluded that voltage-sensitive Ca2+ channels of the presynaptic membrane are not involved in the inhibitory action of Ca2+ antagonists on the Na+-dependent, Ca2+-independent mechanism of GABA release." @default.
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- W2090693732 date "1989-08-01" @default.
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- W2090693732 title "Effect of Organic and Inorganic Calcium Channel Blockers on ?-Amino-n-Butyiic Acid Release Induced by Monensin and Veratrine in the Absence of External Calcium" @default.
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- W2090693732 doi "https://doi.org/10.1111/j.1471-4159.1989.tb07353.x" @default.
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