Is cAMP the obligatory second messenger in the action of lutropin on Leydig cell steroidogenesis.

Abstract:

:Two adenylate cyclase inhibitors: 9-(tetrahydro-2-furyl)adenine and 2'5'-dideoxyadenosine decreased cAMP levels in LH-stimulated immature rat Leydig cells by 20-40%, independent of the concentration of LH. Steroid production was not correlated with this decrease in cAMP, but was increased (146%). The phorbol ester 4 beta-phorbol-12-myristate-13-acetate stimulated steroidogenesis and the phosphorylation of a 17 kD and a 33 kD protein, which was also stimulated by LH, whereas the inactive phorbol ester 4 beta-phorbol-12,13-diacetate did not have any effects. Moreover, the Ca2+-channel blocker diltiazem inhibited LH effects, but had no direct effects on the cholesterol side chain cleavage enzyme. It is concluded that cAMP may not be the only second messenger in LH action, and that other second messenger systems are probably also involved.

authors

Themmen AP,Hoogerbrugge JW,Rommerts FF,van der Molen HJ

doi

10.1016/0006-291x(85)91063-0

subject

Has Abstract

pub_date

1985-05-16 00:00:00

pages

1164-72

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(85)91063-0

journal_volume

128

pub_type

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