细胞外酸化刺激OGR1通过Ca2+-氨酸-NFATc1通路改变骨质细胞分化和活性
Feng-Bo Li1, Su-Qing Bao2, Xiao-Lei Sun1
1Department of Orthopedics, Tianjin Hospital, Tianjin 300211, P.R. China.
Experimental and therapeutic medicine
|December 25, 2024
概括
细胞外酸性增强骨质细胞分化和骨质再吸收,卵巢癌G蛋白结合受体1 (OGR1) 起着关键作用. OGR1调解 (Ca2+) 的升高,这对于骨质细胞中的Ca2+-氨酸-NFATc1信号通路至关重要.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 骨生理学 骨生理学
背景情况:
- 细胞外酸化与骨重塑过程有关.
- 卵巢癌G蛋白结合受体1 (OGR1) 在酸性条件下的骨质细胞功能中的作用尚未完全理解.
- 骨质细胞是参与骨再吸收的关键细胞.
研究的目的:
- 研究OGR1在骨质细胞分化和细胞外酸诱导的活动中的作用.
- 阐明细胞外酸化对骨质细胞功能和相关信号通路的影响.
主要方法:
- 在pH值为6.8或7.4.4的介质中,从RAW 264.7细胞生成骨质细胞.
- 进行了耐酸酸酶 (TRAP) 染色和骨再吸收试验.
- 分析了细胞内 (Ca2+) 水平,基因表达 (TRAP,MMP-9,NFATc1,Cathepsin K,Integrin β3,Calcineurin) 和蛋白质表达.
- 使用铜离子 (Cu2+) 抑制了OGR1;使用BAPTA,EGTA,U73122和环素A调节了信号通路.
主要成果:
- 与pH值7.4.4相比,细胞外酸 (pH值6.8) 显著增加了骨质细胞数和骨再吸收区域.
- 抑制OGR1降低了酸诱导的骨质细胞形成和再吸收.
- 酸性诱导的细胞内Ca2+增加,由OGR1介导,涉及脂酶C,以及与骨质细胞分化和活性相关的上调基因,包括氨酸和NFATc1.1.
结论:
- 细胞外酸化促进骨质细胞分化和骨再吸收活动.
- 通过Ca2+升高,OGR1在调解这些效应方面发挥着至关重要的作用.
- 卡2+-氨酸-NFATc1信号通路对于酸诱导的骨质细胞功能至关重要.
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