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机械压力对人类甲蛋白粉样蛋白形成的影响

Meng You¹, Xinxin Zhang², Yanli Zhang²

¹Department of Cardiology, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, Liaoning, China; State Key Laboratory of Medical Proteomics, National Chromatographic R. & A. Center, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.

International journal of biological macromolecules

|June 17, 2025

概括

机械剪切应力,而不是酸度,驱动了粉样性心肌病 (ATTR-CM) 突变体中粉样性心肌病 (ATTR-CM) 纤维的形成. 这表明ATTR-CM与ATTR-PN的疾病机制是不同的.

科学领域:

生物化学生物化学
蛋白质错折叠疾病蛋白质错折叠疾病
生物物理学的生物物理.

背景情况:

晶氨酸 (TTR) 蛋白质错误折叠导致晶氨酸粉症 (ATTR),包括ATTR心肌病 (ATTR-CM) 和ATTR多神经病 (ATTR-PN).
之前的TTR纤维化研究集中在酸性条件上,忽视了机械力量的影响,如血流剪切应力.

研究的目的:

为了在体外研究圆形剪切力对TTR蛋白纤维化的影响.
将剪切诱导的纤维化与酸诱导的纤维化进行比较,并探索ATTR-CM和ATTR-PN突变的不同敏感性.

主要方法:

在pH中性缓冲器中使用环静脉来模拟血液流动剪切应力.
雇佣传输电子显微镜 (TEM) 来分析纤维的形态.
在剪切应力,和超声波下评估动动力学.

主要成果:

与ATTR-CM相关的TTR突变 (V122I,WT) 比ATTR-PN突变 (V30M) 更容易受到剪切诱导的纤维化.
在酸性条件下没有观察到差异性纤维化倾向.
剪切诱导的纤维化是针对血液循环的,与或超声波不同.
商业TTR稳定剂 (Tafamidis,Diflunisal) 抑制了剪切应力诱导的纤维化.

结论:

机械剪切应力在TTR纤维化中起着关键作用,特别是在ATTR-CM突变体中.
研究结果表明,ATTR-CM和ATTR-PN具有不同的病理生理机制.
这项研究提供了关于血液动力学在粉样性病原发生的作用的见解.

关键词:

聚合聚合是一种聚合.粉样蛋白是什么粉样蛋白是什么转甲基素是一种转甲基素.

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