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慢性的なストレスは,HPA軸不調およびGR核転移障害による時間依存的な骨の喪失につながります
Yupeng Yan1, Jiaxin Li1, Zhengmin Lu1
1Institute of Basic Theory for Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing 100700, China.
International journal of molecular sciences
|February 13, 2026
まとめ
慢性的なストレスは,下垂体-下垂体-腎上腺 (HPA) 軸を混乱させ,グルココルチコイド受容体 (GR) のシグナル伝達を損なうことで,骨粗鬆症を引き起こす. GRシグナリングの回復は,治療的なアプローチを提供することができます.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 骨の生物学 骨の生物学
- 神経科学は神経科学である.
背景:
- 慢性的なストレスと持続的な下垂体-下垂体-副腎 (HPA) 軸の活性化は,骨粗鬆症のような代謝性骨疾患に寄与します.
- ストレスによるHPA軸の調節不良と骨の劣化とを結びつける正確な分子機構は,完全に理解されていません.
研究 の 目的:
- 慢性的なストレスに起因するHPA軸の失調が骨の喪失につながる分子メカニズムを調査する.
- 慢性的なストレス中に脳と骨組織におけるグルココルチコイド受容体 (GR) 信号伝達の役割を調べる.
主な方法:
- 慢性的な予測不可能な軽度のストレス (CUMS) モデルがオスラットで使用されました.
- 骨のミネラル密度 (BMD),マイクロアーキテクチャ,血清コルチコステロン (CORT),HPA軸機能,プロ炎症性サイトカイン,GR発現/転位を評価した.
- 免疫光とウエスタン・ブラット分析を用いて,脳と骨組織におけるGRを検査した.
主要な成果:
- CUMSの曝露は,進行的で時間に依存する骨の損失を誘発し,20週目にBMDと筋質の有意な減少をもたらしました.
- 20週間のCUMSグループは,副腎疲労とHPA軸フィードバック不全を示しました.
- 脳と骨におけるGR核転移の障害,FKBP5の増加,炎症誘発性サイトカインの上昇,および骨格の11β-HSD1のアップレギュレーションが観察されました.
結論:
- 慢性的なストレスは,HPA軸の失調とGRシグナル伝達の障害によって進行的な骨の損失を引き起こす.
- FKBP5媒介によるGR転位障害は,グルココルチコイド耐性および炎症性状態を引き起こし,オステオブラストアポプトシスを加速させます.
- HPA-GR軸をターゲットにすることで,ストレス誘発性骨粗鬆症の治療戦略を提供することができる.
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