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  • Title: Pinealectomy and lesions of the suprachiasmatic nucleus affect the castration response in hamsters exposed to short photoperiods.
    Author: Turek FW, Losee-Olson SH, Ellis GB.
    Journal: Neuroendocrinology; 1983 May; 36(5):335-9. PubMed ID: 6406926.
    Abstract:
    Castration of male hamsters that have been exposed to a nonstimulatory photoperiod (e.g., LD 6:18) results in an attenuated increase in serum LH and FSH levels when compared to the increase observed following castration of hamsters exposed to a stimulatory photoperiod (e.g., LD 14:10). The short-day-induced inhibition of pituitary gonadotropin release, which is not dependent on the negative feedback effects of gonadal steroid hormones, is abolished if (1) the animals are transferred to LD 14:10; (2) the suprachiasmatic nuclei are lesioned at the time of castration; or (3) pinealectomy accompanies castration. These results indicate that both the pineal gland and the SCN mediate the steroid-independent inhibition of pituitary gonadotropin release that occurs during exposure to short days.
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