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- W2048996924 abstract "In rat uterine mince incubated in vitro [3H]inositol was found to be incorporated into phosphatidylinositol (PI) predominantly via a pathway which could be markedly and dose dependently activated with Mn2+ (0.1-10 mM) and inhibited by Ca2+ (1-10 mM). These ions had no effect on the incorporation of [32P]phosphate (32P) into PI indicating a distinct inositol-exchange mechanism for the labeling of PI with [3H]inositol. Treatment of ovariectomized rats for 5 days with 2 micrograms estradiol dipropionate (EDP) increased about 3-fold (when measured in the presence of 1 mM Mn2+) and 4-5-fold (when measured in the presence of 1 mM Ca2+) the inositol-exchange activity in the rat uterus, and these effects were suppressed by 40 and 30% respectively by the concomitant administration of 2 mg progesterone (P). EDP alone or in combination with P increased to the same extent (by a factor of 2-3) the rate of labeling with 32P of phosphatidylcholine (PC), phosphatidylethanolamine (PE) and plasmenylethanolamine (PmE). The labeling rate of PI was increased 1.5-1.7-fold by treatment with EDP and this increase was selectively augmented further to about 2.5-fold by the simultaneous administration of P. Treatment with P alone had no significant effect on the incorporation of either labeled precursor. Steroid hormone treatments had no effect on the amount of these phospholipids in 100 mg uterine tissue, but they increased about 1.7-fold the rate of labeling of ATP with 32P. We conclude that P, when administered together with estradiol, regulates differentially the turnover of the inositol and phosphate moieties of PI with possible physiological consequences." @default.
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- W2048996924 date "1987-12-01" @default.
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- W2048996924 title "Differential effect of progesterone on the labeling of phosphatidylinositol with [3H]inositol and [32P]phosphate in the uterus of the estrogen-treated ovariectomized rat" @default.
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- W2048996924 doi "https://doi.org/10.1016/0022-4731(87)90390-6" @default.
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