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α-catenin中位和actin结合域展开突变物不同影响表皮质强度和叶片迁移
Jeanne M Quinn1, Yuou Wang1, Megan Wood1
1Department of Pulmonary Medicine, Northwestern University, Feinberg School of Medicine, Chicago, IL 60611.
Molecular biology of the cell
|March 20, 2024
概括
改变的α-catenin (α-cat) 结合会影响上皮细胞凝聚力和迁移. 捕获结合机制的损失会加强细胞薄膜,但会损害伤口的关闭,而M域突变会减缓细胞迁移.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- 阿尔法-素 (α-cat) 对于附着结处至关重要,它将素连接到actin细胞骨架.
- α-cat表现出依赖力展开和动因结合,但这些机制对细胞粘附和迁移的差异性影响尚不清楚.
研究的目的:
- 为了比较不同α-cat展开突变对上皮细胞结构和功能的影响.
- 调查改变的α-cat全性机制如何影响表皮板完整性和细胞迁移动态.
主要方法:
- 将α-cat F-actin结合域展开突变 (α-cat-H0-FABD+) 和M-域突变重构成α-cat淘汰MDCK细胞.
- 评估上皮质板的完整性,细胞与细胞的同位化,伤口痕检测,抗体表皮质可访问性,素招募和肌素轻链酸化.
主要成果:
- 部分失去了α-cat捕获结合机制 (α-cat-H0-FABD+) 增强了上皮层完整性和动素同位化,但降低了伤口关闭效率.
- α-cat-H0-FABD+突变体参与了较低张力的活性蛋白网络,通过正常的抗体表位素可访问性和素招募来表明这一点.
- 在伤口修复过程中,α-cat M-domain突变体表现出中间粘附性,但更慢,更不协调的迁移速度.
结论:
- 证明了α-cat M-domain和F-actin-binding域展开突变物对细胞凝聚力和细胞迁移特性的影响.
- 加强α-cat-cortical actin相互作用而不会持续M-domain开放,可以通过合到较低张力actin网络来改善表皮质强度.
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