Ezratty Ellen J, Partridge Michael A, Gundersen Gregg G
Department of Anatomy and Cell Biology, Columbia University, 630 West 168th Street, BB 1217, New York, NY 10032, USA.
Nat Cell Biol. 2005 Jun;7(6):581-90. doi: 10.1038/ncb1262. Epub 2005 May 15.
Imaging studies implicate microtubule targeting of focal adhesions in focal adhesion disassembly, although the molecular mechanism is unknown. Here, we develop a model system of focal adhesion disassembly based on the finding that microtubule regrowth after nocodazole washout induces disassembly of focal adhesions, and that this disassembly occurs independently of Rho and Rac, but depends on focal adhesion kinase (FAK) and dynamin. During disassembly, dynamin interacts with FAK and colocalizes with focal adhesions. Inhibition of dynamin prevents migration of cells with a focal adhesion phenotype. Our results show that focal adhesion disassembly involves microtubules, dynamin and FAK, and is not simply the reversal of focal adhesion formation.
成像研究表明,尽管分子机制尚不清楚,但微管靶向粘着斑在粘着斑解聚过程中发挥作用。在此,我们基于以下发现开发了一种粘着斑解聚的模型系统:诺考达唑洗脱后微管重新生长会诱导粘着斑解聚,且这种解聚独立于Rho和Rac发生,但依赖于粘着斑激酶(FAK)和发动蛋白。在解聚过程中,发动蛋白与FAK相互作用并与粘着斑共定位。抑制发动蛋白可阻止具有粘着斑表型的细胞迁移。我们的结果表明,粘着斑解聚涉及微管、发动蛋白和FAK,并非仅仅是粘着斑形成的逆转。