Effects of Hypothyroidism on Gonadal Function after Transition of Short Day Photoperiod in Male Golden Hamsters (Mesocricetus auratus)

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  • SAITA Erina
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TOHEI Atsushi
    Laboratory Animal Research Center, Dokkyo University School of Medicine
  • JIN Wan Zhu
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TAKAHASHI Shinji
    Ecological Effect Research Team, National Institute for Environmental Studies
  • SUZUKI Akira K.
    PM2.5/DEP Research Project, National Institute for Environmental Studies
  • WATANABE Gen
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TAYA Kazuyoshi
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology

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  • 甲状腺機能低下が短日照明条件下で飼育した雄ゴールデンハムスターの精巣機能に及ぼす影響

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Abstract

Thyroid hormones permit the annual reproductive transition of seasonal breeders. Although, precise function of thyroid hormones in seasonal breeding is not well understood. In the present study, we examined effects of hypothyroidism on the hypothalamus-pituitary-gonadal axis in adult male golden hamsters after transition of the short-day photoperiod (SD; 8 h light: 16 h dark) condition. We confirmed that hypothyroid, which had been induced by administration of thiouracil in drinking water for 4 weeks, did not have direct effects on testes in male hamsters under the long-day photoperiod. Plasma concentrations of free T3 and T4 decreased 15 weeks after transition of SD condition. Plasma concentrations of testosterone in the hypothyroid group decreased earlier than in the control group after the transition from LD to SD. In animals treated with testosterone after castration, plasma concentrations of LH in the hypothyroid group decreased earlier than in the control group after the transition of SD. On the other hand, pituitary response to GnRH for LH release did not change in castrated hamsters as a result of hypothyroidism. These results suggest that thyroid hormones act the hypothalamus and might be required to maintain GnRH secretion in male golden hamsters.<br>

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