Dual effects of G-protein activation on Ca-dependent exocytosis in bovine lactotrophs.

Abstract:

:The whole-cell patch-clamp technique was used to measure cell membrane capacitance (Cm) to monitor exocytosis in single-cultured bovine prolactin-secreting cells (lactotrophs) of the anterior pituitary. The cells were dialyzed with solutions containing different concentrations of ionised Ca and non-hydrolyzable GTP analogues (GTP-gamma-S and GMP-PNP) to activate G-proteins. We have identified two distinct effects of G-protein activation on Ca-induced exocytosis: (i) the maximum Cm increase due to intracellular Ca-dependent exocytosis was diminished, suggesting an inhibitory role of G-proteins close to the site of granule fusion, while (ii) the rate of Cm increase (delta Cm/delta t) was facilitated, revealing conversely a stimulatory role of G-proteins in the translocation of secretory granules to the fusion sites.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Sikdar SK,Zorec R,Brown D,Mason WT

doi

10.1016/0014-5793(89)80936-6

subject

Has Abstract

pub_date

1989-08-14 00:00:00

pages

88-92

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

0014-5793(89)80936-6

journal_volume

253

pub_type

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