グルコース感受性ミオカイン/カルディオカイン MG53は,全身インスリン反応と代謝性ホメオスタシスを調節する
Hong-Kun Wu1, Yan Zhang1, Chun-Mei Cao1
1State Key Laboratory of Membrane Biology, Institute of Molecular Medicine (H.-K.W., Y.Z., C.-M.C., X.H., M.F., Y.Y., L.J., G.C., P.J., S.Z., R.S., W.P., F.L., J.G., L.T., Y.H., D.S., Z.Z., F.L., R.-P.X.).
Circulation
|December 28, 2018
まとめ
Mitsugumin 53 (MG53) は,高血糖に対する反応として,筋肉と心臓によって分泌され,インスリン抵抗性を引き起こします. MG53を中和化することで,2型糖尿病 (T2DM) の治療が可能になる.
科学分野:
- 内分泌学
- メタボリックシンドロームの研究
- 筋肉生理学
背景:
- ミツガミン53 (MG53) は筋肉特異のE3リガゼで,インスリン受容体を分解し,インスリン抵抗性,代謝症候群,および2型糖尿病 (T2DM) に寄与する.
- インスリン感受性とエネルギー代謝の調節におけるMG53の全身的役割は,全身的プロセスに影響する筋肉分泌のミオキンの証拠にもかかわらず,不明のままである.
研究 の 目的:
- MG53が全身インスリン感受性および代謝恒常性を調節するミオカイン/カルディオカインとして機能するかどうかを調査する.
- T2DMの治療戦略として,循環中のMG53を標的とする可能性を調査する.
主な方法:
- 高グルコース/インスリン条件下で,歯類の心臓/骨格筋からの浸出物におけるMG53タンパク質濃度評価
- T2DMとヒトの血清MG53値の測定
- マウスモデルにおける全身のMG53投与と抗体中和の評価効果
- インスリン受容体の細胞外領域との相互作用を分析した.
主要な成果:
- 高血糖/インスリンは,心臓と骨格筋からのMG53分泌を刺激する.
- 循環中のMG53濃度は,糖尿病患者および歯類において上昇しています.
- MG53の全身投与はインスリン抵抗性および代謝症候群を誘発し,MG53の中和はT2DMマウスの治療効果を示している.
- MG53はインスリン受容体の細胞外領域に結合し,アロステル阻害剤として作用する.
結論:
- MG53は,インスリンシグナル伝達を阻害することで,インスリン抵抗性を悪化させる,グルコースに敏感なミオカイン/ カーディオカインとして作用する.
- 循環中のMG53をターゲットにすることで,T2DMとその合併症に対する新しい治療法が提供されます.
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