Cyclic AMP raises cytosolic Ca2+ and promotes Ca2+ influx in a clonal pancreatic beta-cell line (HIT T-15).

Abstract:

:The effect on cytosolic Ca2+ concentration ([Ca2+]i) of cAMP analogues and the adenylate cyclase-stimulating agents forskolin, isoproterenol and glucagon has been examined in an insulin-secreting beta-cell line (HIT T-15) using fura 2. All these manipulations of the cAMP messenger system promoted a rise in [Ca2+]i which was blocked by the Ca2+ channel antagonists verapamil and nifedipine or by removal of extracellular Ca2+. The action of the adenylate cyclase activator forskolin was glucose-dependent. The results suggest that cAMP elevates [Ca2+]i in HIT cells by promoting Ca2+ entry through voltage-sensitive Ca2+ channels, not through mobilization of stored Ca2+. Activation of Ca2+ influx may be an important component of the mechanisms by which cAMP potentiates fuel-induced insulin release.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Prentki M,Glennon MC,Geschwind JF,Matschinsky FM,Corkey BE

doi

10.1016/0014-5793(87)80884-0

subject

Has Abstract

pub_date

1987-08-10 00:00:00

pages

103-7

issue

1

eissn

0014-5793

issn

1873-3468

pii

0014-5793(87)80884-0

journal_volume

220

pub_type

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