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Nongenomic inhibition of catecholamine secretion by 17beta-estradiol in PC12 cells.

Abstract：

:We investigated the effects of 17beta-estradiol, an estrogen, on [(3)H]norepinephrine ([(3)H]NE) secretion in PC12 cells. Pretreatment with 17beta-estradiol reduced 70 mM K(+)-induced [(3)H]NE secretion in a concentration-dependent manner with a half-maximal inhibitory concentration (IC(50)) of 2 +/- 1 microM. The 70 mM K(+)-induced cytosolic free Ca(2+) concentration ([Ca(2+)](i)) rise was also reduced when the cells were treated with 17beta-estradiol (IC(50) = 15 +/- 2 microM). Studies with voltage-sensitive calcium channel (VSCC) antagonists such as nifedipine and omega-conotoxin GVIA revealed that both L- and N-type VSCCs were affected by 17beta-estradiol treatment. The 17beta-estradiol effect was not changed by pretreatment of the cells with actinomycin D and cycloheximide for 5 h. In addition, treatment with pertussis or cholera toxin did not affect the inhibitory effect of 17beta-estradiol. 17beta-Estradiol also inhibited the ATP-induced [(3)H]NE secretion and [Ca(2+)](i) rise. In PC12 cells, the ATP-induced [Ca(2+)](i) rise is known to occur through P2X(2) receptors, the P2Y(2)-mediated phospholipase C (PLC) pathway, and VSCCs. 17beta-Estradiol pretreatment during complete inhibition of the PLC pathway and VSCCs inhibited the ATP-induced [Ca(2+)](i) rise. Our results suggest that 17beta-estradiol inhibits catecholamine secretion by inhibiting L- and N-type Ca(2+) channels and P2X(2) receptors in a nongenomic manner.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Kim YJ,Hur EM,Park TJ,Kim KT

doi

10.1046/j.1471-4159.2000.0742490.x

keywords:

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

2490-6

issue

6

eissn

0022-3042

issn

1471-4159

journal_volume

74

pub_type

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