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ツキノワグマにおける冬眠期の筋肉量維持機構の探索

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Please use this identifier to cite or link to this item:https://doi.org/10.14943/lowtemsci.81.191

Title: ツキノワグマにおける冬眠期の筋肉量維持機構の探索
Other Titles: Regulation of Muscle Mass Maintenance During Hibernation in the Asiatic Black Bears
Authors: 宮﨑, 充功1 Browse this author
Authors(alt): Miyazaki, Mitsunori1
Keywords: ツキノワグマ
骨格筋
タンパク質合成
タンパク質分解
エネルギー代謝
Asiatic Black Bears
Skeletal Muscle
Protein Synthesis
Protein Degradation
Energy Metabolism
Issue Date: 20-Mar-2023
Publisher: 低温科学第81巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 81
Start Page: 191
End Page: 198
Abstract: 身体活動量低下に伴う筋肉量減少は,ヒトにおいては不可避の生理応答現象であり,最終的に運動機能やQOLの大幅な低下をもたらす.一方クマ類をはじめとする冬眠哺乳動物には,長期間の不活動・栄養不良を経験しても筋肉量や発揮筋力が極めて良く保存される,骨格筋萎縮耐性ともいえる未解明の生理機能が存在する.本稿では大型冬眠哺乳動物であるツキノワグマを対象とした検討をもとに,冬眠に伴う骨格筋タンパク質代謝制御機構の変化について概説する.冬眠哺乳動物がどのような適応機構を用いて骨格筋萎縮耐性を獲得するのかを解明することで,サルコペニア予防や寝たきり防止などヒトの健康寿命延伸に繋がる魅力的な戦略を提供することができる.
Hibernating bears experience prolonged periods of torpor and starvation during winter for up to 5-7 months. Though physical inactivity and malnutrition generally lead to profound loss of muscle mass and metabolic dysfunction in humans, hibernating bears show limited muscle atrophy and can successfully maintain locomotive function. These physiological features in bears allow us to hypothesize that hibernating bears uniquely alter the regulation of protein and energy metabolism in skeletal muscle which then contributes to "muscle atrophy resistance" against continued physical inactivity. This review provides an overview of the alterations in the regulatory system of skeletal muscle protein metabolism during hibernation in the Asiatic black bears.
Description: 第二章:恒温動物(哺乳類)
Type: bulletin (article)
URI: http://hdl.handle.net/2115/89094
Appears in Collections:低温科学 = Low Temperature Science > 第81巻

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