PMID: 2509674Jan 1, 1989Paper

Increased FSH levels precede short photoperiod-induced anestrus in intact and unilaterally ovariectomized LSH/SsLak hamsters

Journal of Pineal Research
U E Hauser, B Benson

Abstract

Anestrus brought about after 2-4 weeks of short photoperiod (SP) exposure in LSH/SsLak hamsters is preceded by impaired follicular development. Since the latter is critically dependent on adequate FSH levels, this study tested the hypothesis that SP might alter baseline or compensatory FSH levels prior to the onset of anestrus. Regularly cycling females in 141:10 (LP) were transferred to SP (8L:16D). Between 0800 and 0900 h on days 20 through 24 of SP exposure, half of the animals in diestrus II were unilaterally ovariectomized (UO), and the remaining animals were sham-operated (Sham-UO). Seven hours after surgery, blood samples were taken via cardiac puncture. All animals were killed the following morning at 0900 h. Uterine weights were significantly reduced in SP-exposed hamsters, yet the compensatory increase in FSH following unilateral ovariectomy was not affected; a tendency for higher levels was noted. On proestrus, serum and pituitary FSH levels of SP-exposed Sham-UO animals were significantly elevated over similarly treated LP-exposed hamsters. Interestingly in animals with severe follicular impairment, the highest FSH levels correlated with the lowest uterine weights. The data suggest that SP exposure does not impair c...Continue Reading

References

Jul 1, 1979·Journal of Steroid Biochemistry·B Goldman, S Brown
Mar 1, 1975·Biology of Reproduction·R F Seegal, B D Goldman
Apr 1, 1975·Endocrinology·F J Bex, B D Goldman
Jan 1, 1987·Endocrinology·U E Hauser, B Benson
Jan 1, 1987·Neuroendocrinology·U E Hauser, B Benson
Aug 1, 1970·General and Comparative Endocrinology·S Sorrentino, R J Reiter
Jun 1, 1969·General and Comparative Endocrinology·R J Reiter
Sep 1, 1984·Journal of Reproduction and Fertility·F Croze, P Franchimont
Mar 1, 1983·Proceedings of the Society for Experimental Biology and Medicine·M J SoaresF Talamantes
Jan 1, 1982·Brain Research Bulletin·M S KumarK S Estes

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Citations

Aug 7, 1998·Journal of Pineal Research·B Benson, M E McAsey
Jan 1, 1991·Journal of Pineal Research·K A StokkanR J Reiter

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