在动态机械基板上的受损瘤重组易患心肌病的人类iPSC衍生的心肌细胞
Nhu Y Mai1,2, Xiangjun Wu1,2, Huiyao Liu1,2
1Department of Biomedical and Chemical Engineering, Syracuse University, 318 Bowne Hall, Syracuse, NY 13244 USA.
Cellular and molecular bioengineering
|December 2, 2025
概括
在BAG3 (Bcl2-关联的乙醇基因3) 中的遗传缺陷会在机械应力下恶化心肌细胞损伤. 这项研究表明,BAG3缺乏的心脏细胞有肌纤维组织受损,影响扩张性心肌病的收缩功能.
科学领域:
- 心血管研究研究心血管研究
- 生物材料科学 生物材料科学
- 细胞生物学 细胞生物学
背景情况:
- 扩展性心肌病 (DCM) 在约15%的病例中与BAG3 (Bcl2-相关的阿坦基因3) 基因突变有关.
- 肌纤维组织和收缩功能在心肌细胞中至关重要.
- 动态机械应激会影响人类诱导的多能干细胞衍生心肌细胞 (hiPSC-CMs) 中的肌纤维细胞对齐.
研究的目的:
- 调查动态机械环境对hiPSC-CMs肌纤维细胞组合的影响.
- 为了比较野生类型 (WT) 和BAG3淘汰 (BAG3-/-) hiPSC-CMs对机械应激的反应.
- 利用热响应形状记忆聚合物 (SMP) 来模拟细胞外矩阵 (ECM) 的机械特性.
主要方法:
- 合成的Tert-Butyl Acrylate (TBA) 和Butyl acrylate (BA) 基的SMPs. 基于三聚乙烯酸盐 (TBA) 和三聚乙烯酸盐 (BA) 的SMPs.
- 在30°C的静态和动态SMP基板上培养WT和BAG3-/- hiPSC-CMs.
- 通过免疫细胞化学分析的肌纤维素成分 (Z线,M线) 在聚合物恢复后的5小时和24小时在37°C时通过免疫细胞化学分析.
主要成果:
- 与WT细胞相比,BAG3-/- hiPSC-CMs显示了持续的Z线破坏.
- 5小时后,M线结构最初对机械应力敏感性降低,这表明Z线和M线调节的时间差异.
- 长时间的培养表明BAG3-/- CMs表现出M线组织受损,这表明随着时间的推移对动态机械启动的敏感性增加.
结论:
- 这项研究阐明了遗传缺陷 (BAG3) 和机械应激对心脏瘤结构的综合影响.
- 这些发现凸显了BAG3在机械负荷下维持肌纤维细胞完整性的关键作用.
- 结果提供了关于BAG3相关的DCM疾病进展机制的见解.
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