[Effect of opioid peptides on progesterone production by rat luteal cells in vitro].
The effect of exogenous opioid peptides on progesterone production by incubated rat luteal cells was studied. beta-endorphin (beta-EP) stimulated progesterone production in a dose-dependant manner (10(-8)-10(-6) mol/L); dynorphin exhibited a stimulatory effect only at 10(-6) mol/L, while Met-enkephalin had no substantial effect at dose from 10(-10)-10(-6) mol/L. mu-opioid receptor agonists DAGO and morphine also stimulated progesterone production. The stimulatory actions of beta-EP, DAGO and morphine were reversed completely by naloxone. On account of the fact that the beta-EP level in rat plasma is lower than that in the ovary, it seemed that beta-EP may be an intra-ovarian luteotrophic factor and be involved in the regulation of progesterone production. This action of beta-EP may be mediated by mu-opioid subtype receptors.
Tong
G X
GX
Zhao
B G
BG
Wang
Z X
ZX
Gu
D Y
DY
Luo
L G
LG
Cheng
Z P
ZP
D000818:Animals; D002478:Cells, Cultured; D004399:Dynorphins / Q000494:pharmacology*; D020875:Enkephalin, Ala(2)-MePhe(4)-Gly(5)-; D004745:Enkephalins / Q000494:pharmacology; D005260:Female; D008184:Luteal Cells / Q000166:cytology / Q000378:metabolism*; D011374:Progesterone / Q000096:biosynthesis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D001615:beta-Endorphin / Q000494:pharmacology*
D004745:Enkephalins; D020875:Enkephalin, Ala(2)-MePhe(4)-Gly(5)-; D011374:Progesterone; D001615:beta-Endorphin; D004399:Dynorphins