细胞表面GRP78的抑制和激活的α2M相互作用减弱了纤维化
Jackie Trink1, Ifeanyi Kennedy Nmecha1, Katrine Pilely1,2
1Division of Nephrology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
JCI insight
|December 22, 2025
概括
细胞表面GRP78 (glycoprotein 78) 与激活的α2M (α-2-巨型球蛋白) 结合,驱动纤维化. 抑制这种相互作用为糖尿病和非糖尿病病提供了潜在的治疗策略.
科学领域:
- 腎臟病學 (nephrology) 是一種醫學專業.
- 细胞生物学 细胞生物学
- 分子医学是分子医学.
背景情况:
- 当被激活的α2M (α-2-巨型球蛋白) 结合时,内质网膜蛋白GRP78 (glycoprotein 78) 转移到细胞表面.
- 这种细胞表面GRP78/α2M复合体通过诱导介质细胞中的亲纤维细胞反应,在淋巴结核硬化中发挥作用.
- 间歇性纤维化是病进展的关键因素,涉及近接管状上皮细胞 (PTEC) 和纤维细胞.
研究的目的:
- 研究细胞表面GRP78 (csGRP78) /α2M复合体在介导间歇性纤维化中的作用.
- 探索针对纤维化的csGRP78/α2M相互作用的潜在治疗干预措施.
主要方法:
- 在高葡萄糖和TGF-β1刺激下,评估PTEC和纤维细胞中的csGRP78和α2M水平.
- 在糖尿病病 (阿基塔小鼠) 和非糖尿病损伤 (单侧尿道阻塞) 的小鼠模型中利用了中和抗体 (c38为csGRP78,fα2M为α2M*) 和抑制性.
- 评估了这些干预措施对纤维蛋白生产和信号通路 (YAP/TAZ,Smad3) 的影响.
主要成果:
- 高葡萄糖和TGF-β1增加了PTEC和纤维细胞中的csGRP78和α2M,并且它们的抑制减少了纤维蛋白蛋白的产生.
- 由TGF-β1诱导的纤维化是由非正规的YAP/TAZ信号传递介导的,而不是Smad3.
- 在体内抑制使用抗体或的csGRP78/α2M相互作用,在糖尿病和非糖尿病病模型中显著减弱了管间纤维化和亲纤维化信号.
结论:
- 在各种脏疾病背景下,csGRP78/α2M复合体是管间纤维化症的显著调解者.
- 向csGRP78/α2M相互作用代表了对脏疾病的有前途的抗纤维菌治疗策略.
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