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• W2018403780 startingPage "1037" @default.
• W2018403780 abstract "The actin-based cytomatrix generates stress fibers containing a host of proteins including actin and myosin II and whose dynamics are easily observable in living cells. We developed a dual-radioisotope-based assay of myosin II phosphorylation and applied it to serum-deprived fibroblasts treated with agents that modified the dynamic distribution of stress fibers and/or altered the phosphorylation state of myosin II. Serum-stimulation induced an immediate and sustained increase in the level of myosin II heavy chain (MHC) and 20-kDa light chain (LC20) phosphorylation over the same time course that it caused stress fiber contraction. Cytochalasin D, shown to cause stress fiber fragmentation and contraction, had little effect on myosin II phosphorylation. Okadaic acid, a protein phosphatase inhibitor, induced a delayed but massive cell shortening preceded by a large increase in MHC and LC20 phosphorylation. Staurosporine, a kinase inhibitor known to effect dissolution but not contraction of stress fibers, immediately caused an increase in MHC and LC20 phosphorylation followed within minutes by the dephosphorylation of LC20 to a level below that of untreated cells. We therefore propose that the contractility of the actin-based cytomatrix is regulated by both modulating the activity of molecular motors such as myosin II and by altering the gel structure in such a manner as to either resist or yield to the tension applied by the motors." @default.
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• W2018403780 date "1992-09-01" @default.
• W2018403780 modified "2023-10-09" @default.
• W2018403780 title "Myosin II phosphorylation and the dynamics of stress fibers in serum-deprived and stimulated fibroblasts." @default.
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• W2018403780 doi "https://doi.org/10.1091/mbc.3.9.1037" @default.
• W2018403780 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/275664" @default.
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