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ホルモンと抗体によるチロトロピン受容体の活性化
Jia Duan1,2, Peiyu Xu1,3, Xiaodong Luan4,5,6,7
1The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.
Nature
|August 8, 2022
まとめ
甲状腺刺激ホルモン受容体 (TSHR) の活性化に関する構造的な洞察は,TSHと自己抗体がどのようにグレイス病を引き起こすかを明らかにする. この研究は,TSHRの機能と機能不全の背後にある分子メカニズムを明らかにします.
科学分野:
- 構造生物学
- 内分泌学
- 免疫学
背景:
- 甲状腺刺激ホルモン (TSH) は,甲状腺ホルモン合成を,甲状腺ホルモン受容体 (TSHR) を通して調節する.
- TSHRを標的にする自己抗体は,グレイブス病 (甲状腺機能低下症) と甲状腺機能低下症を引き起こし,世界中で何百万もの患者に影響を及ぼします.
- TSHRの活性化を理解することは,これらの自己免疫性甲状腺疾患の治療に不可欠です.
研究 の 目的:
- TSHRの活性と非活性構造状態を決定する.
- TSHと自己抗体がTSHRを活性化する分子メカニズムを解明する.
- TSHR活性化と他のグリコタンパク質ホルモン受容体を比較する.
主な方法:
- X線結晶学を用いて,TSHと結合するTSHR,自己抗体M22,抑制抗体K1- 70の高解像度構造を得ました.
- アロステリックモジュールML-109とLHCGRとの構造的比較が採用された.
- TSHRと脂質ラフトの相互作用の分析が行われました.
主要な成果:
- TSHRがTSHと結合し,自己抗体M22を活性化するとともに,抑制性抗体K1- 70の非活性化構造が報告されています.
- TSHとM22は,TSHR細胞外ドメイン (ECD) の直立活性構造を誘導する.
- 保存されたP10断片は,トランスメブラン領域とのECD相互作用を媒介し,普遍的なグリコタンパク質ホルモン受容体活性化機構を明らかにする.
結論:
- この研究は,TSHと自己抗体によるTSHR活性化のための保存されたECD-プッシュメカニズムを示しています.
- TSHRの局所化におけるコレステロールの役割が強調された.
- これらの発見は,グレイブス病の病原性を理解するための分子基盤を提供します.
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