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Biology of Reproduction, Vol 19, 159-166, Copyright © 1978 by Society for the Study of Reproduction

Effects of Estradiol on Serum and Pituitary Gonadotropin Concentrations during Selective Elevations of Follicle Stimulating Hormone

SCOTT C. CHAPPEL 1, REID L. NORMAN 1, , and HAROLD G. SPIES 1

1 Reproductive Physiology, Oregon Regional Primate Research Center, Beaverton, Oregon 97005 and Department of Anatomy, University of Oregon Health Sciences Center, Portland, Oregon 97201


Release of follicle stimulating hormone (FSH) without a concomitant elevation in peripheral luteinizing hormone (LH) concentration occurs in estrous and acutely ovariectomized (ovx) proestrous hamsters. In both cases, a rapid decline in circulating estradiol-l7beta (E2) levels is observed before the elevation in serum FSH concentration. In this study, we observed that artificially maintained E2 levels in both estrous and ovx proestrous hamsters prevented the elevation in pituitary FSH concentration and depressed the rise in serum FSH that normally would have occurred. Pituitary LH concentrations increased in estrous hamsters given E2, but did not increase in untreated estrous controls. Serum LH concentrations remained low in both groups. Administration of E2 to ovx proestrous hamsters had little effect on pituitary or serum LH concentrations. These observations suggest that in both estrous and ovx proestrous hamsters, selective elevations in pituitary and serum FSH concentrations are dependent on the decline of peripheral E2 concentrations.

Submitted on November 8, 1977
Accepted on January 9, 1978




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Copyright © 1978 by the Society for the Study of Reproduction.