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. 1989 Oct 1;263(1):11–18. doi: 10.1042/bj2630011

Neurotransmitter release from bradykinin-stimulated PC12 cells. Stimulation of cytosolic calcium and neurotransmitter release.

K C Appell 1, D S Barefoot 1
PMCID: PMC1133384  PMID: 2574973

Abstract

The effect of bradykinin on intracellular free Ca2+ and neurotransmitter secretion was investigated in the rat pheochromocytoma cell line PC12. Bradykinin was shown to induce a rapid, but transient, increase in intracellular free Ca2+ which could be separated into an intracellular Ca2+ release component and an extracellular Ca2+ influx component. The bradykinin-induced stimulation of intracellular free Ca2+ displayed a similar time course, concentration dependencies and extracellular Ca2+ dependence as that found for neurotransmitter release, indicating an association between intracellular free Ca2+ levels and neurotransmitter secretion. The selective BK1-receptor antagonist des-Arg9,[Leu8]BK (where BK is bradykinin) did not significantly affect the stimulation of intracellular free Ca2+ or neurotransmitter release. In contrast, these effects of bradykinin were effectively blocked by the selective BK2-receptor antagonist [Thi5,8,D-Phe7]BK, and mimicked by the BK2 partial agonist [D-Phe7]BK in a concentration-dependent manner. The stimulation of intracellular free Ca2+ and neurotransmitter release induced by bradykinin was shown not to involve voltage-sensitive Ca2+ channels, since calcium antagonists had no effect on either response at concentrations which effectively inhibit depolarization-induced responses. These results indicate that bradykinin, acting through the interaction with the BK2 receptor, stimulates an increase in intracellular free Ca2+ leading to neurotransmitter secretion. Furthermore, bradykinin-induced responses involve the release of intracellular Ca2+ and the influx of extracellular Ca2+ that is not associated with the activation of voltage-sensitive Ca2+ channels.

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Selected References

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