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• W64287675 abstract "This paper describes the effect of gonadotropin-releasing hormone (GnRH, gonadoliberin) on phospholipid metabolism in cultured rat pituitary cells. The cells were incubated with [32P]Pi to label endogenous phospholipids (10-60 min) and then stimulated with GnRH for up to 60 min. Cellular phospholipids were separated by two-dimensional t.l.c. and the radioactivity was determined. Phosphatidylinositol (PI), a minor constituent of cellular phospholipids (7.7%), was the major labelled phospholipid, accounting for 45% of the total radioactivity, at early periods after pulse labelling. On the other hand, phosphatidylcholine, the major cellular phospholipid (37%), was labelled only to 32% of the total radioactivity. The remaining label was distributed among phosphatidylethanolamine (4.2%), cardiolipin (3.4%), phosphatidic acid (PA, 2.5%), and phosphatidylserine (1.8%). GnRH doubled 32P labelling of PA and PI significantly at 1 and 5 min of incubation respectively in the presence or absence of extracellular Ca2+. Labelling of other phospholipids was not affected by GnRH treatment. The half-maximal stimulating dose (ED50) for PI labelling and lutropin release was 0.75 nM and 0.5 nM respectively, and the stimulatory effect was blocked by the potent GnRH antagonist [D-Glp1,pClPhe2,D-Trp3,6]GnRH. GnRH-stimulated PA and PI labelling could not be demonstrated after 1 and 45 min of incubation respectively, or when the prelabelling was conducted for 60 min rather than 10 min. These results suggest heterogeneous compartmentalization of gonadotroph PA and PI pools and that increased PI turnover might be a transducing signal for Ca2+ gating that follows gonadotroph GnRH-receptor activation." @default.
• W64287675 created "2016-06-24" @default.
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• W64287675 date "1985-10-01" @default.
• W64287675 modified "2023-09-27" @default.
• W64287675 title "Calcium-independent phosphatidylinositol response in gonadotropin-releasing-hormone-stimulated pituitary cells" @default.
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• W64287675 doi "https://doi.org/10.1042/bj2310019" @default.
• W64287675 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1152697" @default.
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