Nano-mechanical properties of living cells expressing constitutively active RhoA effectors

作者：Tamura Kazushi^*; Mizutani Takeomi; Haga Hisashi; Kawabata Kazushige

来源：Biochemical and Biophysical Research Communications, 2010, 403(3-4): 363-367.

DOI：10.1016/j.bbrc.2010.11.036

• Cytoskeleton
• Actomyosin
• Atomic force microscopy
• Force mapping

Filamentous actin and myosin-II are major determinants of cell mechanics and are tightly regulated by a small guanosine triphosphatase, RhoA, and its downstream effectors. We examined the effects of constitutively active mutants of RhoA effectors, which have not been reported before, on cortical stiffness of living cells by using scanning probe microscopy, fluorescence microscopy, and truncated mutants of RhoA effectors labeled with a fluorescent protein. Our data indicated that expression of a constitutively active mutant of Dial, a formin-family actin polymerizer, enhanced cortical stiffness and increased actin filament quantity in cells. Furthermore, expression of a constitutively active mutant of Rho-associated coiled-coil kinase, a myosin-II activator, softened the cell cortex but increased myosin-II activity. Our findings provide new insights into anomalous mechanics of cells, which is a topic of current interest in a variety of biological research fields.

• 出版日期2010-12-17