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- W2979686421 abstract "Abstract The formin FHOD1 acts as a nucleating, capping and bundling protein of actin filaments. In cells, release from the C-terminal diaphanous autoregulatory domain (DAD) of FHOD1 stimulates the protein into the active form. However, the cellular physiological relevance of active form FHOD1 and the phenotypic regulation by FHOD1 depletion are not completely understood. Here, we show that in contrast with the cytosolic diffused expression of auto-inhibited FHOD1, active FHOD1 by C-terminal truncation was recruited into all three types of actin stress fibers in human osteosarcoma cells. Notably, the recruited active FHOD1 was more incorporated with myosin II than α-actinin, and associated with both naïve and mature focal adhesions. Active FHOD1 displayed faster turnover than actin molecules on ventral stress fibers. Moreover, we witnessed the emergence of active FHOD1 from the cell periphery, which subsequently moved centripetally together with transverse arcs. Furthermore, FHOD1 knockdown resulted in defective maturation of actomyosin bundles and subsequently longer non-contractile dorsal stress fibers, whereas the turnover of both actin and myosin II were maintained normally. Importantly, the loss of FHOD1 led to slower actin centripetal flow, resulting in abnormal cell spreading and migration defects. Taken together, these results reveal a critical role of FHOD1 in temporal- and spatial- control of the morphology and dynamics of functional actin stress fibers during variable cell behavior." @default.
- W2979686421 created "2019-10-18" @default.
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- W2979686421 date "2019-10-18" @default.
- W2979686421 modified "2023-09-25" @default.
- W2979686421 title "Active FHOD1 promotes the formation of functional actin stress fibers" @default.
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- W2979686421 doi "https://doi.org/10.1042/bcj20190535" @default.
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