在细胞重编程过程中通过矩阵刚度对表观遗传状态的双相调节
Yang Song1, Jennifer Soto1, Sze Yue Wong2
1Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
Science advances
|February 14, 2024
概括
矩阵刚性通过控制表观遗传状态和核转移酸转移酶 (HAT) 的核运输来对细胞重编程进行双相调节. 纤维细胞转化为神经元的最佳转化发生在中间硬度 (20 kPa) 时.
科学领域:
- 生物材料科学 生物材料科学
- 细胞生物学 细胞生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 细胞功能受到细胞外基质的物理性质的影响.
- 了解矩阵刚性如何影响细胞重编程对于再生医学至关重要.
研究的目的:
- 研究矩阵刚度在调节染色质重组和细胞重编程中的作用.
- 阐明控制纤维细胞转化为神经元的机械-表观遗传机制.
主要方法:
- 使用具有可调整刚度的矩阵.
- 执行ATAC测序以评估染色体的可访问性.
- 测量了基因素乙化和基因素乙转移酶 (HAT) 活性.
- 研究了HAT通过G-actin,cofilin和importin-9进行的核运输.
主要成果:
- 矩阵刚度表现出表观遗传状态的双相调节和纤维细胞到神经元的转换效率,达到20kPa的峰值.
- 染色体对神经元基因的可访问性跟随了与矩阵刚度类似的趋势.
- 基素乙化和HAT活性在20kPa时最高,而HAT抑制消除了刚性效应.
- 由于G-actin/cofilin水平与importin-9可用性之间的相互作用,HAT的核运输是由矩阵刚度双相调节的.
结论:
- 矩阵刚度是机械-表观遗传过程的关键调节器.
- 一种涉及双相HAT核运输的新机制解释了硬度依赖的细胞重编程.
- 这些发现为细胞工程在疾病建模和再生医学中提供了宝贵的见解.
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