RAPID INCREASE OF SERUM FSH LEVELS IN CASTRATED MALE HAMSTERS FOLLOWING TRANSFER FROM SHORT TO LONG DAYS OR EXPOSURE TO A SINGLE LONG DAY
- 1 July 1982
- journal article
- research article
- Published by The Endocrine Society in Endocrinology
- Vol. 111 (1), 332-334
- https://doi.org/10.1210/endo-111-1-332
Abstract
The purpose of this study was to develop an animal model in which a change in the length of the day could induce a rapid alteration in pituitary gonadotropin release. The transfer of castrated male hamsters (castrated for 34 days) that had been maintained on a nonstimulatory LD 6:18 light cycle for 14 weeks to a stimulatory LD 14:10 light regime resulted in a 2–3 fold increase in serum FSH levels within three days. Furthermore, exposure to a single LD 14:10 light cycle also induced a significant increase in serum FSH titers within three days, even though the animals had been returned to LD 6:18. This animal model should prove extremely useful in elucidating the neural, endocrine and cellular events which mediate the effects of light on reproductive function.Keywords
This publication has 9 references indexed in Scilit:
- Comparison of Serum Hormone Titers in Golden Hamsters During Testicular Growth Induced by Pinealectomy and Photoperiodic Stimulation1Biology of Reproduction, 1980
- Photoperiodic Regulation of Serum Luteinizing Hormone and Follicle-Stimulating Hormone in Castrated and Castrated-Adrenalectomized Male Hamsters*Endocrinology, 1980
- Effects of Prolactin on Testicular Regression and Recrudescence in the Golden Hamster*Endocrinology, 1980
- EFFECTS OF PHOTOPERIOD ON HYPOTHALAMIC LUTEINIZING HORMONE RELEASING HORMONE IN THE MALE HAMSTERJournal of Endocrinology, 1979
- Hypothalamic-Pituitary-Gonadal Interactions during Spontaneous Testicular Recrudescence in Golden HamstersBiology of Reproduction, 1979
- Prolonged Exposure of Castrated Male Hamsters to a Nonstimulatory Photoperiod: Spontaneous Change in Sensitivity of the Hypothalamic-Pituitary Axis to Testosterone Feedback*Endocrinology, 1979
- The Interaction of the Photoperiod and Testosterone in Regulating Serum Gonadotropin Levels in Castrated Male Hamsters12Endocrinology, 1977
- Regulation of Serum Gonadotropins by Photoperiod and Testicular Hormone in the Syrian Hamster12Endocrinology, 1976
- Circulating LH and FSH Levels and Testicular Function in Hamsters During Light Deprivation and Subsequent Photoperiodic Stimulation1Endocrinology, 1974