The effects of dihydropyridines of neurotransmitter release from cultured neuronal cells

Ismail A. Shalaby, Sathapana Kongsamut, Stephen B. Freedman, Richard J. Miller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Depolarizing stimuli increase the release of transmitter substances from cultured PC12 pheochromocytoma cells and reaggregate cultures of mouse mesencephalic dopamine neurones. We measured the stimulated release of (3H) norepinephrine and (3H) dopamine from these systems respectively. In the cultured mouse dopaminergic neurones, several organic calcium channel blockers including nitrendipine, D-600, verapamil and diltiazem were unable to inhibit potassium-evoked transmitter release. However, release was blocked by 3 mM cobalt. The novel dihydropyridine calcium channel agonist BAY K8644 also had no effect on basal or evoked dopamine release. In contrast, BAY K8644 greatly stimulated the potassium-evoked release of (3H) norepinephrine from PC12 cells. The BAY K8644 enhanced release could be blocked by the dihydropyridine antagonist nitrendipine. These results indicate that while stimulus-secretion coupling in the PC12 cell line involves dihydropyridine sensitive calcium channels, this is not the case in primary cultured neurones.

Original languageEnglish (US)
Pages (from-to)1289-1295
Number of pages7
JournalLife Sciences
Issue number12
StatePublished - Sep 17 1984

ASJC Scopus subject areas

  • General Pharmacology, Toxicology and Pharmaceutics
  • General Biochemistry, Genetics and Molecular Biology


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