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タイロトロピン受容体におけるホルモンの作用の自己抗体模倣
Bryan Faust1,2,3, Christian B Billesbølle1, Carl-Mikael Suomivuori4,5,6,7
1Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, USA.
Nature
|August 8, 2022
まとめ
甲状腺ホルモン受容体の活性化は,受容体の細胞外領域を指向することによって,甲状腺ホルモンを模倣する. この方向の変化は 甲状腺ホルモンの調節と病気の鍵です
科学分野:
- 生物化学
- 分子生物学
- 内分泌学
背景:
- 甲状腺 ホルモンは 代謝,成長,発達を制御します
- タイロトロピン (TSH) は,TSH受容体 (TSHR) を通して甲状腺ホルモン合成を制御する.
- グラブス病は TSHRを活性化する自己抗体で 甲状腺機能過剰症に繋がります
研究 の 目的:
- 自身抗体がTSHRを活性化する構造的メカニズムを解明する.
- 抗体がチロトロピンの働きを 模倣する仕組みを理解する
主な方法:
- 活性および非活性TSHRの冷凍電子顕微鏡構造を決定した.
- TSHR,チロトロピン,および活性化自己抗体間の構造的相互作用を分析した.
主要な成果:
- TSHR細胞外ドメインの異なった方向性を,活性状態と非活性状態で特定した.
- タイロトロピンとグレイヴス病の自己抗体は,細胞外領域の直立方向性を誘導することを実証した.
- 細胞外ドメインの方向転換が 細胞外ドメインの形状変化を誘発し 受容体の活性化につながることを明らかにした.
結論:
- TSHR 細胞外ドメインの方向転換は受容体の活性化に十分である.
- この活性化メカニズムは,グリコタンパク質ホルモン受容体と,潜在的に大きな細胞外ドメインを持つ他のGPCRで共有されます.
- このメカニズムの理解は,グレイヴス病の病原体と潜在的な治療目標の洞察を提供します.
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