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In GH3 pituitary cells, acetylcholine and vasoactive intestinal peptide antagonistically modulate adenylate cyclase, cyclic AMP content, and prolactin secretion.

Abstract：

:In GH3 pituitary cell homogenates, acetylcholine (ACh) (IC50 200 nM) inhibits adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] activity in a concentration- and GTP-dependent manner. Maximal inhibition was obtained with 10 microM ACh and corresponded to approximately a 50% decrease in basal enzyme activity. ACh inhibition is antagonized by atropine and is mimicked by muscarinic receptor agonists, but not by nicotine. ACh reduces the adenylate cyclase stimulation by vasoactive intestinal peptide (VIP), without changing its EC50. In intact GH3 cells, ACh decreases the cyclic AMP content and the rate of prolactin release in a concentration-dependent manner. When the cells are simultaneously exposed to VIP and ACh, the VIP-induced increases in cyclic AMP accumulation and prolactin release are reduced by 80% and 40%, respectively. The potency of VIP is not significantly changed by the presence of ACh, and vice versa.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Onali P,Eva C,Olianas MC,Schwartz JP,Costa E

subject

Has Abstract

pub_date

1983-09-01 00:00:00

pages

189-94

issue

2

eissn

0026-895X

issn

1521-0111

journal_volume

24

pub_type

杂志文章

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