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The cell surface progesterone receptor which stimulates calcium influx in human sperm is unlike the A ring reduced steroid site on the GABAA receptor/chloride channel.

Abstract：

:Progesterone elicits a rapid, transient calcium influx in sperm that is a prerequisite for the progesterone-induced acrosome reaction. The possibility that the GABAA receptor/chloride channel was the receptor that mediated the progesterone-induced calcium influx in human sperm was examined. A-ring reduced 3 alpha-hydroxy pregnane steroids (e.g. alfaxalone, allopregnanolone, pregnanolone), which are active on the GABAA receptor/chloride channel, were found to be much weaker than progesterone at stimulating Ca2+ influx in sperm. The effects of a variety of progesterone metabolites and analogs and other steroids were compared for their ability to (i) stimulate GABA-induced 36Cl- uptake in synaptoneurosomes, (ii) stimulate GABA-induced Cl- currents in HEK-293 cells transfected with alpha 1, beta 2, and gamma 2 subunits of the GABAA receptor/chloride complex, and (iii) elicit a rapid Ca2+ influx in sperm. No correlation was observed between the ability of a given steroid to stimulate Ca2+ influx and efficacy in eliciting either 36Cl- uptake or chloride currents. Importantly, the action of progesterone to stimulate Ca2+ influx was not modified by GABA, diazepam, picrotoxin and pentobarbitol (known regulators of the GABAA receptor/chloride channel). It is concluded from these studies that the cell surface progesterone binding site on human sperm that mediates progesterone-induced changes in [Ca2+]i is unlike the steroid binding site on the GABAA receptor/chloride channel.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Blackmore PF,Im WB,Bleasdale JE

doi

10.1016/0303-7207(94)90126-0

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

237-43

issue

2

eissn

0303-7207

issn

1872-8057

journal_volume

104

pub_type

杂志文章

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