Document Detail

Estrogens before birth and development of sex-related reproductive traits in the female guinea pig.
MedLine Citation:
PMID:  4054856     Owner:  NLM     Status:  MEDLINE    
Influences of estrogens on the differentiation of psychosexual traits in the female guinea pig were studied. Pregnant animals were injected intramuscularly with either 1, 2, or 3.3 micrograms estradiol benzoate (EB) or with 1 or 3 micrograms diethylstilbestrol dipropionate (DESDP). Injections were started on the 29th day of pregnancy, given daily for 6 days, and continued every other day until parturition. Female offspring were evaluated for onset of puberty, ovarian function, and lordosis and mounting behavior in adulthood. Prenatal treatment with 3 micrograms DESDP caused delayed puberty, impaired ovarian function, reduced responsiveness of lordosis to EB and P in adulthood (defeminization), augmented mounting in the absence of hormones (masculinization), and reduced responsiveness of mounting to exogenous EB and P in adulthood (defeminization). Prenatal treatment with 1 microgram DESDP produced similar but less pronounced effects. Prenatal treatment with 3.3 micrograms EB also caused a delay in puberty. However, responsiveness of lordosis to EB and P in adulthood was enhanced by treatment with either 1 or 3.3 micrograms EB prenatally. Further, neither mounting in the absence of hormones nor mounting in response to EB and P in adulthood were affected in any measurable way by any prenatal treatment with EB. These results show that estrogens can have masculinizing and defeminizing effects on sexually dimorphic reproductive traits in guinea pigs. The failure of EB to duplicate or parallel the effects of DESDP is not completely understood at this time, but it may indicate that less of the active substance reaches the target tissues following maternal and placental metabolism of EB than of DESDP.
M Hines; R W Goy
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hormones and behavior     Volume:  19     ISSN:  0018-506X     ISO Abbreviation:  Horm Behav     Publication Date:  1985 Sep 
Date Detail:
Created Date:  1985-11-22     Completed Date:  1985-11-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0217764     Medline TA:  Horm Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  331-47     Citation Subset:  IM    
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MeSH Terms
Diethylstilbestrol / pharmacology*
Estradiol / pharmacology*
Guinea Pigs
Ovary / embryology
Prenatal Exposure Delayed Effects*
Progesterone / pharmacology
Sex Differentiation / drug effects*
Sexual Behavior, Animal / drug effects*
Testosterone / pharmacology
Grant Support
Reg. No./Substance:
50-28-2/Estradiol; 56-53-1/Diethylstilbestrol; 57-83-0/Progesterone; 58-22-0/Testosterone

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