解離タンパク質3 (UCP3) は,未差別化骨格筋筋細胞のエネルギーとストレス関連の経路を調節する

Austin Kindall^1,2, Yen Huynh³, Jeesun Kim¹

¹Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, Texas, United States of America.

American journal of physiology. Cell physiology

|August 25, 2025

まとめ

解離タンパク質3 (UCP3) は,未分化筋肉細胞におけるエネルギーと酸化還元ストレスを調節する. UCP3の減少は,グルコースの吸収を阻害し,酸化ストレスに対する感受性を高めます.

科学分野:

ミトコンドリア生物学
骨格筋の生理学
細胞の代謝

背景:

解離タンパク質3 (UCP3) は,機能が不明なミトコンドリアタンパク質である.
以前の研究では,基底発現が低いため,分化されていないミオブラストにおけるUCP3の役割を無視して,分化細胞に焦点を当てていた.
UCP3はミトコンドリア溶解体キャリアファミリーに属し,UCP1とUCP2との同質性を共有しています.

研究の目的:

不分化骨格筋ミオブラストにおけるUCP3の機能的役割を調査する.
エネルギーセンシングと酸化還元ストレス経路におけるUCP3の関与を明らかにする.
細胞代謝とストレス反応に対するUCP3欠乏の影響を分析する.

主な方法:

ワイルドタイプ (WT),全身ノックアウト (wKO),条件付きノックアウト (cKO) のミオブラストを使用した.
UCP3,AMPK (pAMPK),PPARδ/β,およびGLUT4の評価されたタンパク質およびmRNAレベル
インスリン刺激によるグルコースの吸収と脂肪酸の蓄積の測定
GSH/GSSG比を含む酸化ストレスと低酸素に対する細胞の感受性を評価した.

主要な成果:

UCP3 ノックアウト (KO) ミオブラストはAMPK活性化とPPARδ/βおよびGLUT4タンパク質濃度の上昇を示した.
UCP3 KOミオブラストは,インスリン刺激によるグルコース吸収の低下を示した.
脂肪酸の蓄積とPPARδ標的遺伝子のアップレギュレーションがUCP3KO細胞で観察されました.
UCP3 KOミオブラストは酸化ストレスと低酸素に対する感度が高く,GSH/ GSSG比率が低下した.

結論:

UCP3は,未分化骨格筋ミオブラストのエネルギー感知経路を調節する上で重要な役割を果たします.
UCP3は,これらの細胞における酸化還元バランスを維持し,酸化ストレスを軽減するために不可欠です.
この発見は,初期段階の筋肉細胞における代謝とストレス反応の重要なレギュラーとしてUCP3を強調しています.

キーワード:

エネルギー信号メタボリズムミオブラストレドックス信号解離タンパク質 3

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