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Prostaglandin E2 can bimodally inhibit and stimulate the epididymal adipocyte adenylyl cyclase activity.

Abstract：

:Measurements of prostaglandin E2 (PGE2)-induced adenylyl cyclase activity in membranes isolated from epididymal rat adipocytes revealed inhibition of cAMP production at low concentrations of PGE2 (less than 10 mM) and stimulation at higher concentrations. This biphasic effect of PGE2 was obtained when adenylyl cyclase was stimulated with GTP or NaF. In the presence of forskolin only the inhibitory phase by PGE2 was observed. Sulprostone, a PGE2 analogue, did not affect cAMP synthesis in the presence of either GTP or NaF; however, in the presence of forskolin, it inhibited cAMP production similarly to PGE2. Treatment of the membranes with cholera or pertussis toxin did not alter the biphasic effect of PGE2 on cAMP production. These findings raise the possibility that PGE2 acts through several receptor subtypes which are coupled to GTP binding proteins different from the classical Gi or Gs proteins.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Cohen-Luria R,Rimon G

doi

10.1016/0898-6568(92)90073-h

subject

Has Abstract

pub_date

1992-05-01 00:00:00

pages

331-5

issue

3

eissn

0898-6568

issn

1873-3913

pii

0898-6568(92)90073-H

journal_volume

4

pub_type

杂志文章

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