Effects of Starvation and Refeeding on Gonadotropin and Thyrotropin Subunit mRNAs in Male Japanese Quail(Endocrinology)

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概要

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• The contents of mRNAs encoding LHβ-, FSHβ-, TSHβ- and common α-subunit precursor molecules were measured in food-deprived and subsequently re-fed male Japanese quail. Pituitary LHβ, FSHβ and common α mRNA levels were decreased by starvation, and increased to the control levels by re-feeding. The rates of decreases of LHβ and common α mRNA levels were greater the corresponding rate for FSHβ levels. Pituitary TSHβ mRNA levels were not decreased by starvation, but increased transitorily by re-feeding. Plasma LH and triiodothyronine levels were decreased by starvation, and then increased to control levels by re-feeding, while plasma FSH and thyroxine levels did not show significant changes. Plasma LH and FSH levels showed positive correlations with pituitary common a and FSHβ mRNA levels, respectively, while plasma thyroxine levels showed a negative correlation with TSHβ mRNA levels. Hepatic weight was decreased slightly but significantly by starvation, and then showed a remarkable rebound after re-feeding was started. These results suggest that LH synthesis and secretion are more sensitive to starvation than FSH synthesis and secretion in Japanese quail, and that LH production recovered to initial levels within several days when birds were fully fed. Also, there is a possibility that the synthesis of TSH is accelerated transitorily by re-feeding. Furthermore, these results showed that there are different relationships between the plasma levels of LH, FSH, and TSH and the various hormone subunit mRNA levels. The remarkable change in hepatic weight leads us to assume that hepatic thyroid hormone metabolism is affected by starvation and re-feeding.

• 社団法人日本動物学会の論文
• 2002-04-25

著者

• KOBAYASHI Masaki

  Department of Internal Medicine, Tokyo Medical University, Kasumigaura Hospital

• Kobayashi Masaki

  Department Of Internal Medicine Tokyo Medical University Kasumigaura Hospital

• Ishii Susumu

  Department Of Biology School Of Education Waseda University

• Kobayashi M

  Department Of Biology Division Of Natural Sciences International Chiristian University

• Cockrem John

  Conservation Endocrinology Research Group, Institute of Veterinary, Animal and Biomedical Sciences,

• Ishii S

  Okayama Univ. Okayama Jpn

• Cockrem J

  Conservation Endocrinology Research Group Institute Of Veterinary Animal And Biomedical Sciences Mas

• Kobayashi Masaki

  Department Of Biology School Of Education Waseda University

• Kobayashi Masaki

  Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Josai University

• Ishii Susumu

  Department of Biological Science, Graduate School of Science, Tokyo Metropolitan University

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