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Serum levels of gonadotropins in hamsters exposed to short photoperiods effects of adrenalectomy and ovariectomy



Serum levels of gonadotropins in hamsters exposed to short photoperiods effects of adrenalectomy and ovariectomy



Journal of Endocrinology 83(1): 113-118



Female hamsters rendered acyclic by exposure to short photoperiods (10 h light:14 h darkness) showed diurnal surges of LH [lutropin] and FSH [follitropin] which persisted after removal of the ovaries and adrenal glands. The reduced increase in gonadotropin secretion after ovariectomy, typical of hamsters exposed to short days, also was not contingent upon the presence of the adrenal glands. Supersensitivity of the neuroendocrine axis to feedback of ovarian or adrenal steroids apparently cannot fully account for either the daily surges of gonadotropins or the diminished response of LH and FSH to ovariectomy in hamsters maintained on short days. These changes may result instead from other pineal-mediated actions of short photoperiods upon the brain.

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Accession: 006402276

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PMID: 574889



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