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2017 ; 5
(ä): e4063
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English Wikipedia
Activation of Rho-kinase and focal adhesion kinase regulates the organization of
stress fibers and focal adhesions in the central part of fibroblasts
#MMPMID29158989
Katoh K
PeerJ
2017[]; 5
(ä): e4063
PMID29158989
show ga
Specific regulation and activation of focal adhesion kinase (FAK) are thought to
be important for focal adhesion formation, and activation of Rho-kinase has been
suggested to play a role in determining the effects of FAK on the formation of
stress fibers and focal adhesions. To clarify the role of FAK in stress fiber
formation and focal adhesion organization, the author examined the formation of
new stress fibers and focal adhesions by activation of Rho-kinase in FAK knockout
(FAK(-/-)) fibroblasts. FAK(-/-) cells were elliptical in shape, and showed
reduced numbers of stress fibers and focal adhesions in the central part of the
cells along with large focal adhesions in the peripheral regions. Activation of
Rho-kinase in FAK(-/-) cells transiently increased the actin filaments in the
cell center, but these did not form typical thick stress fibers. Moreover, only
plaque-like structures as the origins of newly formed focal adhesions were
observed in the center of the cell. Furthermore, introduction of an exogenous
GFP-labeled FAK gene into FAK(-/-) cells resulted in increased numbers of stress
fibers and focal adhesions in the center of the cells, which showed typical
fibroblast morphology. These results indicated that FAK plays an important role
in the formation of stress fibers and focal adhesions as well as in regulation of
cell shape and morphology with the activation of Rho-kinase.