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Biology of Reproduction, Vol 1, 152-156, Copyright © 1969 by Society for the Study of Reproduction

Quantitative Changes in Pituitary Acidophils in Cycling and Mated Syrian Hamsters

THOMAS L. AVERY 1, and PERRY STAHL 1

1 Laboratory of Animal Science, St. Jude Children's Hospital, and Departments of Anatomy, Obstetrics and Gynecology, University of Tennessee Medical School Memphis, Tennessee 38101


Acidophils exhibited marked quantitative variation in the anterior pituitary glands of 31 cyclic, nonmated female Syrian hamsters, ranging from 34.2% to 58.7%. Stage of estrous cycle accounted for much of this variation with acidophils ranging from a high average value of 56.2 ± 1.6% on Day 4 to a low of 39.5 ± 3.8% on Day 2. Mating of eight females during the evening of Day 1 resulted in a significant additional decrease in acidophils to 23.2 ± 0.9% on Day 2. Acidophilic degranulation thus occurred to a less than maximal degree in the usual sequence of events comprising the hamster estrous cycle with additional degranulation being caused by repeated acts of mating. It is postulated that this increased degranulation of acidophils which occurs in response to mating may reflect the secretion of additional "luteotropin" necessary for the initiation of pregnancy or pseudopregnancy.




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M. Diamond
Intromission Pattern and Species Vaginal Code in Relation to Induction of Pseudopregnancy
Science, September 4, 1970; 169(3949): 995 - 997.
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Copyright © 1969 by the Society for the Study of Reproduction.