Modulation of calcium current in snail neurones by dopamine: the role of intracellular free calcium

Chemeris, N.K.; Iljin, V.I.; Safronova, V.G.

Brain Research 460(1): 142-145


ISSN/ISBN: 0006-8993
PMID: 2851369
Accession: 005914358

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The inhibition of voltage-gated Ca-current in Lymnaea stagnalis (L.) neurones by dopamine cannot be prevented by intracellular administration of the Ca-chelating agent, EGTA. At the same time, substitution of external Ba2+ for Ca2+ substantially weakens the dopamine-induced inhibition. The Ca-ionophore, A23187, also produces an inhibition, but the inhibitory effects of A23187 and of dopamine on Ca-current are non-additive. These findings allow one to suggest that the entry and increase of free Ca concentration presumably in the narrow submembrane space, but not in the bulk of cytoplasm, is important for development of inhibition of neuronal Ca-current by dopamine.