Progesterone-like effects of estradiol on reproductive behavior and hypothalamic progestin receptors in the female rat

Neuroendocrinology
B ParsonsB S McEwen

Abstract

During the rat estrous cycle, estradiol (E2) and progesterone (P) synergize to activate reproductive behavior. However, receptivity and proceptivity can be elicited by E2 alone in ovariectomized (OVX) animals, particularly when E2 doses are high. The purpose of this study was to determine the neuroendocrine mechanism by which E2 elicits P-dependent reproductive behavior. Adult OVX females received estrogen treatment for 72 h, which consisted of 5 mm Silastic capsules containing 100% E2 or 10% E2, or of 3 injections of estradiol benzoate (EB; 20 micrograms daily). At 72 h, animals were sacrificed for nuclear progestin receptor (NPR) measurements, while others were tested for reproductive behavior. The remaining animals received 1-mg injections of E2, P, moxestrol (Mox) or oil, and either were sacrificed 2 h later for NPR measurements or were tested 4 h later for reproductive behavior. A subset of the animals receiving 1 mg E2 received concurrent administration of the protein synthesis inhibitor, anisomycin (ANI; 100 mg/kg). Acute administration of 1 mg of E2 or P significantly elevated proceptivity, receptivity and NPRs in the mediobasal hypothalamus-preoptic area (MBH-POA) and pituitary (PIT) in females primed with 100% E2. An ...Continue Reading

Citations

Jan 1, 1988·Journal of Steroid Biochemistry·B S McEwen
Jan 1, 1991·The Journal of Steroid Biochemistry and Molecular Biology·B S McEwenC Woolley
Sep 14, 2007·Brain Research Reviews·Paul MicevychKevin Sinchak
Sep 15, 1989·Toxicology and Applied Pharmacology·K EckolsL Uphouse

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