Effects of Hypothyroidism on Gonadal Function after Transition of Short Day Photoperiod in Male Golden Hamsters (Mesocricetus auratus)
スポンサーリンク
概要
- 論文の詳細を見る
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.
- 日本繁殖生物学会の論文
著者
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SUZUKI Akira
PM2.5/DEP Research Project, National Institute of Environmental Studies
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TOHEI Atsushi
Laboratory Animal Research Center, Dokkyo University School of Medicine
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SAITA Erina
Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu Univ
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JIN Wan
Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu Univ
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Watanabe Gen
Department Of Basic Veterinary Science United Graduate School Of Veterinary Sciences Gifu University
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Taya Kazuyoshi
Department Of Basic Veterinary Science United Graduate School Of Veterinary Sciences Gifu University
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Takahashi Shinji
Ecological Effect Research Team Dioxin And Environmental Endocrine Disrupter Research Project National Institute For Environmental Studies
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Tohei Atsushi
Laboratory Animal Research Center, Dokkyo Medical University
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SAITA Erina
Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University
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JIN Wan
Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University
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