在类风湿性关节炎中,骨细胞通过p38-MAPK-CREB通路调节骨质保护素的表达
Keitaro Yasumoto1, Toshifumi Fujiwara1, Toshiaki Sugita1
1Department of Orthopaedic Surgery, Graduate School of Medical Science, Kyushu University, Fukuoka 812-8582, Japan.
JBMR plus
|March 11, 2026
概括
类风湿性关节炎 (RA) 会增加骨中的骨质保护素 (OPG). 瘤坏死因子-α (TNF-α) 通过p38-MAPK和CREB信号增强OPG,影响RA骨损失中的骨质细胞活性.
科学领域:
- 骨生物学和风湿病学 骨生物学和风湿病学
- 炎症的细胞和分子机制
- 骨细胞信号通路 骨细胞信号通路
背景情况:
- 类风湿性关节炎 (RA) 与全身和局部骨质损失有关,但在炎症期间骨细胞中骨质细胞调节因子的调节尚未完全理解.
- 骨质细胞是骨质稳定的关键调节者,可能在RA相关的骨质再吸收中发挥重要作用.
研究的目的:
- 在类风湿性关节炎 (RA) 的背景下,研究骨细胞衍生因素,特别是骨质保护素 (OPG).
- 阐明通过TNF-α等炎症刺激来调节骨细胞中OPG表达的分子机制.
- 探索骨质细胞衍生因素对骨质细胞分化和活动的功能影响.
主要方法:
- 使用微CT和免疫阻塞,分析了RA和骨关节炎 (OA) 患者的股骨头骨样本.
- 在实验室研究中,使用小鼠骨质细胞样细胞系 (MLO-Y4) 和用TNF-α刺激的骨质细胞丰富骨基 (OEBF) 进行了试验.
- 使用药理抑制剂和染色体免疫沉 (ChIP) 的信号通路 (p38-MAPK,CREB) 的研究.
- 对骨质细胞受条件介质的反应中骨质细胞分化的评估.
主要成果:
- 与OA患者相比,RA患者的皮层骨显示了较高的骨质保护素 (OPG) 蛋白水平.
- 在骨细胞模型中,TNF-α显著诱导骨质细胞调节转录和增加OPG分泌.
- TNF-α激活了p38-MAPK和CREB信号,这对于TNF-α诱导的OPG产生至关重要.
- 骨细胞受条件介质改变了骨质细胞形态和减少了血统标记物的表达,这表明骨质细胞成熟的调节.
结论:
- 骨质保护素 (OPG) 在风湿性关节炎 (RA) 患者的股骨部皮质骨中升级.
- 在骨细胞中,p38-MAPK和CREB信号通路调解TNF-α诱导的OPG表达.
- 骨细胞通过分泌OPG和其他调节骨质细胞行为的因素,促进RA的发病.
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