Document Detail

Progesterone-like effects of estradiol on reproductive behavior and hypothalamic progestin receptors in the female rat.
MedLine Citation:
PMID:  6540375     Owner:  NLM     Status:  MEDLINE    
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 equivalent dose of Mox was without effect. ANI blocked the acute activation of feminine reproductive behavior by 1 mg of E2. In the absence of acute steroid administration, animals primed for 72 h with EB showed higher levels of reproductive behavior than animals primed with 100% E2.(ABSTRACT TRUNCATED AT 250 WORDS)
B Parsons; T C Rainbow; L Snyder; B S McEwen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neuroendocrinology     Volume:  39     ISSN:  0028-3835     ISO Abbreviation:  Neuroendocrinology     Publication Date:  1984 Jul 
Date Detail:
Created Date:  1984-09-18     Completed Date:  1984-09-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0035665     Medline TA:  Neuroendocrinology     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  25-30     Citation Subset:  IM    
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MeSH Terms
Anisomycin / pharmacology
Cell Nucleus / metabolism
Estradiol / pharmacology*
Estradiol Congeners
Ethinyl Estradiol / analogs & derivatives,  pharmacology
Hypothalamus / metabolism*
Pituitary Gland / metabolism
Progesterone / pharmacology*
Promegestone / metabolism
Rats, Inbred Strains
Receptors, Progesterone / drug effects,  metabolism*
Sexual Behavior, Animal / drug effects*
Reg. No./Substance:
0/Estradiol Congeners; 0/Receptors, Progesterone; 22862-76-6/Anisomycin; 34184-77-5/Promegestone; 34816-55-2/moxestrol; 50-28-2/Estradiol; 57-63-6/Ethinyl Estradiol; 57-83-0/Progesterone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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