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Concerted enhancement of calcium influx, neurotransmitter release and protein phosphorylation by a phorbol ester in cultured brain neurons.

Abstract：

:We have recently shown that the phorbol ester 12-O-tetradecanoyl-phorbol-13-acetate enhances the depolarization induced, calcium dependent release of [3H]dopamine from cultured brain neurons in the rat. In the present study the effects of 12-O-tetradecanoyl-phorbol-13-acetate on the kinetic parameters of depolarization induced calcium influx and on Ca2+ dependent neurotransmitter release and protein phosphorylation were investigated. Depolarization induced neurotransmitter release from the neurons occurs in two phases: an initial, fast release and a subsequent slow release. At low extracellular Ca2+, 12-O-tetradecanoyl-phorbol-13-acetate enhanced the quantity of fast release and in addition, increased the rate constant of the slow release. These effects mimicked the effects of increasing the extracellular Ca2+. Various phorbol derivatives known to activate the Ca2+ activated phospholipid dependent protein kinase (protein kinase C) were also able to enhance the stimulated release of [3H]dopamine from the neurons. 12-O-tetradecanoyl-phorbol-13-acetate induced the incorporation of 32Pi into a protein with an apparent molecular weight of 45,000 daltons regardless of depolarization or of the presence of Ca2+. In addition, 12-O-tetradecanoyl-phorbol-13-acetate induced in unstimulated neurons, Ca2+ dependent increase in the amount of 32Pi incorporated into a 43,000 dalton protein and decrease in the amount incorporated into a 55,000 dalton protein. These changes mimicked the Ca2+ dependent changes in protein phosphorylation which occur upon stimulation of the neurons. Kinetic studies of depolarization induced Ca2+ uptake by the neurons indicated that 12-O-tetradecanoyl-phorbol-13-acetate enhanced the maximal influx of Ca2+ through the voltage sensitive Ca2+ channels by 40%. The results indicate that 12-O-tetradecanoyl-phorbol-13-acetate acts primarily on the regulation of stimulated Ca2+ entry into the cells. Consequently neurotransmitter release at submaximal extracellular [Ca2+] is enhanced.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Zurgil N,Yarom M,Zisapel N

doi

10.1016/0306-4522(86)90140-5

subject

Has Abstract

pub_date

1986-12-01 00:00:00

pages

1255-64

issue

4

eissn

0306-4522

issn

1873-7544

pii

0306-4522(86)90140-5

journal_volume

19

pub_type

杂志文章

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