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在肺损伤期间,CSP7通过向p53-纤维解质通路来保护膜上皮细胞

Bijesh Puthusseri¹, Ashoka Kumar Bhagavath¹, Daniel Korir¹

¹The University of Texas Health Science Center at Tyler, Tyler, Texas, United States.

American journal of respiratory cell and molecular biology

|September 13, 2024

概括

膜细胞中的端粒功能障碍导致像IPF和COPD这样的肺部疾病. 在小鼠模型中,CSP7治疗改善了端粒功能,逆转了细胞损伤,并表明肺纤维化有治疗潜力.

科学领域:

肺部医学肺部医学
细胞生物学细胞生物学
遗传学是一个遗传学.

背景情况:

异形性肺纤维化 (IPF) 和慢性阻塞性肺病 (COPD) 的特征是膜上皮的再生受损.
在II型膜上皮细胞 (A2Cs) 中的端粒功能障碍是这些疾病的关键因素.
衰老,遗传因素和像烟草烟雾 (TS) 这样的有毒物质暴露会加剧端粒功能障碍.

研究的目的:

调查CSP7是否可以改善A2Cs中的端粒功能.
评估CSP7对白素 (BLM) 诱导的肺纤维化 (PF) 和慢性TS暴露模型中的衰老和亡的保护作用.
阐明涉及CSP7介导保护的分子通路.

主要方法:

从IPF/COPD患者和BLM/TS暴露的小鼠模型中分离的A2Cs.
分析的端粒长度,p53,caspase-3,β-galactosidase,SIAH-1,TRF1,TRF2和TERT的表达方式.
在BLM和TS模型中用CSP7治疗野生型小鼠.
使用了PAI-1和uPA小鼠模型,以及microRNA-34a淘汰模型.

主要成果:

来自IPF/COPD患者和纤维化小鼠的A2Cs显示端粒缩短,p53增加,caspase-3,β-galactosidase,SIAH-1,TRF1,TRF2降低,TERT.
在暴露于BLM或TS的野生型小鼠中,CSP7治疗逆转了这些变化.
在A2Cs中PAI-1缺乏或microRNA-34a损失赋予了对端粒功能障碍的抵抗力.

结论:

涉及p53,SIAH-1和TRF2/TERT通路的A2C中的端粒功能障碍有助于肺纤维化和损伤.
通过恢复端粒功能和保护A2Cs,CSP7显示出治疗潜力.
p53-microRNA-34a和p53-uPA通路与端粒功能障碍有关.

关键词:

IPF; COPD; 白血素; 烟草烟雾; CSP7; p53; uPA; PAI-1; 端粒长度; A2Cs; TRF2; TRF1; TERT; TRF2; TRF1; 烟草烟雾; CSP7; p53; uPA; PAI-1; 端粒长度; A2Cs; TRF2; TRF1; TERT

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