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The effects of steroids on the presence or absence and relative magnitude of rat seminiferous tubule contractions were evaluated microscopically. Both 10- and 30-mg implants of estradiol in vivo and concentrations of 10(-8) or 10(-9) M estradiol in vitro depressed the percentage of seminiferous tubules contracting without altering the magnitude of the contraction. Higher doses of both testosterone and dihydrotestosterone in vivo and in vitro maintained the tubular contractions at normal or above normal levels whereas lower doses of these compounds reduced both the percentage and magnitude of the tubules contracting. The results from these experiments suggest that rat seminiferous tubule contractions can be altered by steroids. Testosterone and dihydrotestosterone inhibit the contractions at lower doses and stimulate the contractions at higher doses and thus may regulate the transport of spermatozoa from the rat testicle.
R L Urry, and
R W Asay, and
A T Cockett
January 1975,
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R L Urry, and
R W Asay, and
A T Cockett
April 1979,
Biology of reproduction,
R L Urry, and
R W Asay, and
A T Cockett
May 2022,
Reproduction (Cambridge, England),
R L Urry, and
R W Asay, and
A T Cockett
October 1997,
Fertility and sterility,
R L Urry, and
R W Asay, and
A T Cockett
April 2002,
Contraception,
R L Urry, and
R W Asay, and
A T Cockett
December 1989,
International journal of andrology,
R L Urry, and
R W Asay, and
A T Cockett
January 2003,
Gene therapy,
R L Urry, and
R W Asay, and
A T Cockett
January 1975,
Current topics in molecular endocrinology,
R L Urry, and
R W Asay, and
A T Cockett
February 2007,
Biology of reproduction,
