On the specificity of verapamil as a calcium channel-blocker.

Abstract:

:The stimulated uptake of 45Ca2+ into incubated cerebrocortical synaptosomes caused by veratrine (75 microM) was blocked by low concentrations of verapamil (0.5-30 microM) which did not prevent or reduce depolarization as judged by efflux of potassium (K+). However, verapamil did not prevent amino acid neutrotransmitter release at these low concentrations and this is discussed in terms of mobilization of internal calcium (Ca2+) stores. At higher concentrations (30-200 microM) verapamil appeared to act additionally at sodium (Na+) channels since both depolarization-induced K+ efflux and neurotransmitter release were reduced or prevented. When K+, at a high concentration (56 mM), was used as the depolarizing agent, both 45Ca2+ influx and neurotransmitter release were prevented by verapamil across a wide concentration range (0.5-200 microM). The data are discussed in terms of the specificity of action of verapamil on Ca2+ channels.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Norris DK,Bradford HF

doi

10.1016/0006-2952(85)90314-4

subject

Has Abstract

pub_date

1985-06-01 00:00:00

pages

1953-6

issue

11

eissn

0006-2952

issn

1873-2968

pii

0006-2952(85)90314-4

journal_volume

34

pub_type

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