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- W144036542 abstract "The production of inositol phosphates in response to gonadotropin releasing hormone (GnRH) was studied in rat anterior pituitary tissue preincubated with [3H]inositol. Prelabelled paired hemipituitaries from prepubertal female rats were incubated in the presence or absence of GnRH in medium containing 10 mM-Li+ X Li+, which inhibits myo-inositol-1-phosphatase, greatly amplified the stimulation of inositol phosphate production by GnRH (10(-7) M) to 159, 198 and 313% of paired control values for inositol 1-phosphate, inositol bisphosphate and inositol trisphosphate respectively after 20 min. The percentage distribution of [3H]inositol within the phosphoinositides was 91.3, 6.3 and 2.4 for phosphatidylinositol, phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate respectively and was unaffected by GnRH. The stimulation of inositol trisphosphate production by GnRH was evident after 5 min incubation, was dose-dependent with a half-maximal effect around 11 nM, and was not inhibited by removal of extracellular Ca2+. Elevation of cytosolic Ca2+ by membrane depolarization with 50 mM-K+ had no significant effect on inositol phosphate production. These findings are consistent with the hypothesis that GnRH action in the anterior pituitary involves the hydrolysis of phosphatidylinositol 4,5-bisphosphate. The resulting elevation of inositol trisphosphate may in turn lead to intracellular Ca2+ mobilization and subsequent stimulation of gonadotropin secretion." @default.
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- W144036542 date "1985-03-01" @default.
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- W144036542 title "Gonadotropin releasing hormone stimulates the formation of inositol phosphates in rat anterior pituitary tissue" @default.
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- W144036542 doi "https://doi.org/10.1042/bj2260563" @default.
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