Elsevier

Brain Research

Volume 843, Issues 1–2, 2 October 1999, Pages 193-198
Brain Research

Short communication
Potentiation of transmitter release from NMB human neuroblastoma cells by kappa-opioids is mediated by N-type voltage-dependent calcium channels

https://doi.org/10.1016/S0006-8993(99)01904-6Get rights and content

Abstract

The selective kappa-opioid agonist trans-(±)-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl) cyclohexyl] benzenacetamidemethansulfonate (U50,488) potentiates both basal and depolarization-evoked [3H]dopamine release from NMB cells. The potentiation of dopamine release by U50,488 is mediated by N-type voltage-dependent calcium channels since it is blocked by omega-conotoxin, and is resistant to pertussis toxin (PTX)-treatment. When the stimulation of release by U50,488 is blocked by the N-channel antagonist omega-conotoxin, an inhibitory effect on dopamine release is revealed, suggesting that stimulatory and inhibitory effects of U50,488 are exerted in parallel.

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Acknowledgements

This study was supported by a grant from the Anti-Drug Authority of Israel.

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