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- W1993434538 abstract "Female, ovariectomized rats were treated with estradiol and then, after various time periods, given an intravenous injection of isoproterenol or epinephrine. 30 seconds later uteri were frozen insitu and assayed for cyclic AMP and glycogen phosphorylase. The cyclic AMP response to catecholamines was significantly depressed as early as 30 minutes after estrogen and at 6, 12 and 24 hours was 50% of that in non-estrogen-treated controls. Catecholamine-induced glycogen phosphorylase activation was unchanged until 24 hours after estrogen when it was significantly increased over controls. At 48 hours of estrogen both the cyclic AMP and phosphorylase responses to catecholamines were greater than controls. Estrogen regulates uterine β-adrenergic sensitivity but the time courses of estrogen effects on the cyclic AMP and glycogen phosphorylase response changes are different. Catecholamine-induced uterine cyclic AMP formation is biphasic: suppression during the first 24 hours of estrogen followed by recovery and finally augmentation by 48 hours. Catecholamine-induced glycogen phosphorylase activation shows only augmentation after 24–48 hours of estrogen. It is concluded that estrogen has independent effects on the β-adrenergic-glycogen phosphorylase activation pathway at two different points; one prior to cyclic AMP formation and another after cyclic AMP formation." @default.
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- W1993434538 date "1978-06-01" @default.
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- W1993434538 title "Uterine cyclic AMP formation: Biphasic effect of estrogen on catecholamine sensitivity" @default.
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- W1993434538 doi "https://doi.org/10.1016/0024-3205(78)90552-0" @default.
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