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Role of voltage-sensitive calcium channels in [Ca2+]i and secretory responses to activators of protein kinase C in pituitary gonadotrophs.

Abstract：

:The gonadotropin secretory response of anterior pituitary cells to phorbol esters includes both extracellular Ca2(+)-dependent and -independent components (Stojilković et al, 1988; J. Biol. Chem. 263, 17301-17306, 1988). In cultured pituitary cells, measurements of [Ca2+]i using Fura-2 and of LH release during cell perifusion studies revealed that the initial effects of phorbols and permeant diacylglycerols on these responses are extracellular Ca2(+)-dependent and are mediated through activation of voltage- and dihydropyridine-sensitive calcium channels. On the other hand, pretreatment with phorbol esters for 30 to 60 min inhibited subsequent [Ca2+]i responses to diacylglycerols and phorbols and significantly reduced agonist-induced biphasic [Ca2+]i responses, with no change in the number of GnRH receptors. These findings demonstrate that protein kinase C exerts both positive and negative control of [Ca2+]i, and indicate that the calcium, phospholipid dependent enzyme participates in the activation of voltage-sensitive calcium channels and hormone secretion in pituitary gonadotrophs.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Izumi S,Stojilković SS,Iida T,Krsmanović LZ,Omeljaniuk RJ,Catt KJ

doi

10.1016/0006-291x(90)91282-w

subject

Has Abstract

pub_date

1990-07-16 00:00:00

pages

359-67

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(90)91282-W

journal_volume

170

pub_type

杂志文章

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