由基质拓引发的骨质生成相关基因的质基因修饰促进人类介质干细胞的分化
Xun Xu1, Weiwei Wang1, Jie Zou1,2
1Institute of Active Polymers and Berlin-Brandenburg Centre for Regenerative Therapies, Helmholtz-Zentrum Hereon, 14513 Teltow, Germany.
ACS applied materials & interfaces
|June 13, 2023
概括
优化的骨科植入物表面通过促进干细胞分化来增强骨整合. 特定的表面粗度通过机械信号和表观遗传变化引导细胞行为,改善植入成功.
科学领域:
- 生物材料科学 生物材料科学
- 干细胞生物学 干细胞生物学
- 组织工程是组织工程.
背景情况:
- 骨科植入物成功取决于骨组织的整合,受表面地形的影响.
- 细胞对人工微环境的反应对于骨质整合至关重要.
- 了解不同表面结构上的干细胞行为是植入物设计的关键.
研究的目的:
- 为了研究表面微观结构和聚碳酸 (PC) 基板中的细胞指导性之间的关系.
- 确定表面地形如何影响人类骨髓介质干细胞 (hBMSCs) 的骨质分化.
- 阐明表面拓驱动的干细胞命运决定的潜在分子和表观遗传机制.
主要方法:
- 制造具有不同表面粗度的PC基板 (光滑,中等和高峰间距).
- 在这些基板上培养hBMSC,并评估骨质生分化标志物.
- 评估细胞粘附,F-actin组合,细胞收缩力 (pMLC表达),YAP核转位和核变形.
- 在骨质基因基因促进体上分析表观遗传修饰 (H3K27me3,H3K9ac).
- 使用抑制剂和siRNA来探测关键信号分子 (YAP,整体蛋白,F-actin,肌酸蛋白) 的作用.
主要成果:
- 一个高粗的PC表面 (hPC) 与峰值间距类似于骨显著改善了hBMSC骨质分化与光滑 (sPC) 和中度 (mPC) 表面相比.
- 该hPC基质通过pMLC上调增强了细胞粘附,F-actin组织,并通过pMLC上调增强了收缩力.
- 增加的细胞收缩性诱导了YAP核转位,核延长,并在骨质基因基因位点中改变了基因组修饰 (减少H3K27me3,增加H3K9ac).
- 机制研究证实了YAP,整体蛋白,F-actin,肌酸蛋白和核膜蛋白在这个过程中的参与.
结论:
- 表面地形,特别是模仿脊椎骨的粗度,可以对干细胞进行骨质分化的生物指导.
- 涉及YAP,F-actin和myosin的细胞机械转导通路,加上表观遗传修饰,调解对表面微观结构的反应.
- 这些发现为设计先进的,生物指导性的骨科植入物提供了关键的见解,这些植入物可以促进加强骨质整合.
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