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• W2000651145 endingPage "545" @default.
• W2000651145 startingPage "534" @default.
• W2000651145 abstract "Progesterone (P) action following estrogen priming is required normally for the facilitation of estrous behavior in female rats. Although mechanisms by which P exerts its influence on estrous responsiveness have not been elucidated, the primary site of action of P has been shown to be the ventromedial nucleus of the hypothalamus (VMN). The objective of the present series of experiments was to describe the temporal parameters of P action in the VMN in the facilitation of estrous behavior in estrogen-primed female rats. Subjects were female Long-Evans rats stereotaxically outfitted with 23-ga. guide cannulae directed towards the VMN. Crystalline P was applied directly to the brain tissue via bilateral 28-ga. insert cannulae, which could be inserted and removed easily through the guide cannulae. Animals were ovariectomized and estrogen primed with 5% estradiol Silastic capsules. They received a counterbalanced series of two experimental tests: one involving a manipulation with a P-filled implant, and another with a blank implant. In the first experiment, a significant increase in estrous responsiveness occurred only after 2 hr exposure of the VMN to P, whereas 4 hr were required for a full display of estrous behavior, including solicitation. In Experiment 2, P was lowered into the brain for either 1, 2, or 4 hr, and testing took place 4 hr after the lowering of the implant. It was found that 2 hr of P exposure was sufficient to facilitate full estrous responsiveness at 4 hr. In Experiment 3, it was revealed that the duration of estrous responsiveness was directly related to the time the P implant remained in the brain. In the fourth experiment, the time course of P retention in brain tissue, revealed by determination of 3H-progesterone levels in hypothalamus, agreed with the behavioral findings. Progesterone levels in the region of the VMN remained high while a P implant was in place, but declined rapidly after removal. A dual mechanistic hypothesis for P action in the facilitation of estrous behavior is presented." @default.
• W2000651145 created "2016-06-24" @default.
• W2000651145 creator A5031872067 @default.
• W2000651145 creator A5035809946 @default.
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• W2000651145 date "1987-01-01" @default.
• W2000651145 modified "2023-09-23" @default.
• W2000651145 title "Temporal aspects of ventromedial hypothalamic progesterone action in the facilitation of estrous behavior in the female rat." @default.
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• W2000651145 doi "https://doi.org/10.1037//0735-7044.101.4.534" @default.
• W2000651145 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3651233" @default.
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