细胞外矩阵刚性作为早期骨关节炎的关键分子事件:RhoA/ROCK和ERK1/2通路之间的交叉
Kai Huang1, Haili Cai2, Yifan Hong3
1Tongde Hospital of Zhejiang Province, Hangzhou, China.
The American journal of sports medicine
|February 19, 2026
概括
骨关节炎的细胞外基质 (ECM) 硬会激活RhoA/ROCK信号,然后激活ERK1/2信号,促进软骨的退化. SPRY-4调节了这种途径,为早期OA提供了潜在的治疗点.
科学领域:
- 生物医学工程 生物医学工程
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 骨关节炎 (OA) 具有渐进的软骨退化特征,其中细胞外基质 (ECM) 在调节状细胞行为方面发挥着至关重要的作用.
- 由于衰老和关节损伤造成的ECM硬化,对OA的软骨损伤有很大的贡献.
- 虽然RhoA/ROCK和ERK1/2信号通路与软骨重塑有关,但在不同的ECM刚性条件下,它们的相互作用仍然不太清楚.
研究的目的:
- 阐明ECM刚性如何影响状细胞的代谢和合成活性,导致软骨退化.
- 为了研究RhoA/ROCK和ERK1/2信号通路之间的交叉声响应ECM刚性.
- 探索SPRY-4作为调节器在这种依赖度的信号级联中的作用.
主要方法:
- 在控制硬度 (8,12和25kPa) 的基板上培养了红细胞,以评估可活性,基因表达 (MMP-13,ADAMTS-5,COL2A1,ACAN) 和信号激活 (p-ROCK,p-ERK1/2) 通过西式抹杀和qPCR.
- 在体内研究中使用了Ad-LOX诱导的骨硬化模型在子中,用原子力显微镜测量了软骨弹性模量.
- 通过SPRY-4调制 (过度表达和淘汰) 和共免疫沉来检查RhoA/ROCK-ERK1/2交叉声.
主要成果:
- 基质硬度增加 (25 kPa) 显著降低了状细胞的活力,并促进了代谢表型,由增加的MMP-13和ADAMTS-5表达和减少的COL2A1和ACAN表达证明.
- 硬度显著提高了RhoA/ROCK和ERK1/2信号通路的调节 (p-ROCK和p-ERK1/2).
- 对RhoA/ROCK或ERK1/2的药理抑制逆转了硬度诱导的代谢转移,RhoA/ROCK被确定为ERK1/2.2的上游.
- 过度表达SPRY-4减弱了硬度诱导的p-ROCK和p-ERK1/2激活,而SPRY-4倒置恢复了p-ERK1/2水平,证实SPRY-4是关键的硬度响应调节器.
- 在体内,Ad-LOX诱导了软骨硬化和升高的p-ROCK和p-ERK1/2水平,证实了体外发现.
结论:
- 通过激活RhoA/ROCK-ERK1/2信号级联,ECM硬化触发了软质细胞的催化转变.
- SPRY-4作为一个关键的度响应调节器,在RhoA/ROCK和ERK1/2信号之间调节交叉声.
- 这些发现强调了RhoA/ROCK-ERK1/2-SPRY-4轴作为早期OA诊断和干预的潜在机械敏感目标.
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