人类塑是新型细胞骨pH传感器,在基本pH下具有降低的F-actin捆绑能力
Lucas A Runyan1, Elena Kudryashova1, Richa Agrawal1
1Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
Journal of molecular biology
|June 27, 2025
概括
塑 (PLS2和PLS3) 是一种新的pH传感器,可以在性细胞内pH (pHi) 时减少actin捆绑. 这种pH敏感度会影响细胞迁移,并可能推动癌症的进展.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 癌症研究 癌症研究
背景情况:
- 细胞内pH (pHi) 对于细胞平衡至关重要,影响细胞迁移和分裂等关键过程.
- pH 调节失调与各种疾病有关,包括癌症和神经退行性疾病.
- 虽然一些细胞骨蛋白是已知的pH传感器,但塑在pH传感中的作用在很大程度上仍未被探索.
研究的目的:
- 为了研究actin捆绑蛋白质plastin 2 (PLS2) 和plastin 3 (PLS3) 的pH感应能力.
- 阐明塑对细胞内pH值波动作出反应的机制.
- 探索塑pH敏感性对细胞过程和疾病,特别是癌症的影响.
主要方法:
- 研究了生理学pH值变化对PLS2和PLS3.3的F-actin捆绑活性的影响.
- 利用纤维细胞观察异位表达PLS2和PLS3在不同pH条件下的局部.
- 在PLS2中通过局部定向突变发生的特定pH感应残留物.
主要成果:
- 在性pH下,Plastins PLS2和PLS3表现出减少的F-actin捆绑活性.
- 较高的细胞溶液pH会导致PLS2和PLS3与乙烯酸脱离,而酸性pH会促进它们与焦点粘附和应力纤维的关联.
- 在PLS2中,histidine 207 (His207) 被确定为一种关键的pH感应残留物,突变改变了它的pH敏感性和活性组合能力.
结论:
- 塑作为pH传感器起作用,调节actin细胞骨的动态,以应对细胞内pH值.
- 在性pH值下,塑的较弱的活性蛋白捆绑促进了细胞迁移和细胞运动所必需的细胞骨重组.
- 塑的确定的pH敏感性可能有助于性瘤微环境中的癌细胞增殖和转移.
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