Effects of Ca2+ and a phorbol ester on insulin secretion from islets of Langerhans permeabilised by high-voltage discharge.

Abstract:

:Isolated rat islets of Langerhans permeabilised by high-voltage discharge secreted insulin in response to elevations in Ca2+ over the range 100 nM to 10 microM Ca2+. The phorbol ester, 12-O-tetradecanoylphorbol 13-acetate (TPA), had no effects on insulin secretion in the absence of Ca2+. In the presence of Ca2+ concentrations of greater than 10 nM, TPA produced dose-related shifts in the Ca2+-activation curve to lower Ca2+ concentrations, together with marked increases in the maximum secretory response to Ca2+. These results suggest that, in islets, the activation of protein kinase C is important in modulating both the sensitivity of the exocytotic mechanism to intracellular Ca2+, and the magnitude of the insulin secretory response.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Jones PM,Stutchfield J,Howell SL

doi

10.1016/0014-5793(85)81002-4

subject

Has Abstract

pub_date

1985-10-21 00:00:00

pages

102-6

issue

1

eissn

0014-5793

issn

1873-3468

pii

0014-5793(85)81002-4

journal_volume

191

pub_type

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