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Functional diversity between Rho-kinase- and MLCK-mediated cytoskeletal actions in a myofibroblast-like hepatic stellate cell line
- Source :
-
Biochemical & Biophysical Research Communications . May2003, Vol. 305 Issue 2, p223. 6p. - Publication Year :
- 2003
-
Abstract
- Using a rat myofibroblast-like hepatic stellate cell line, we studied the actomyosin-based cytoskeletal actions mediated by Rho-kinase and/or myosin light chain kinase (MLCK). Calmodulin/MLCK inhibitors W-7 and ML-7 attenuated cell migration dose-relatedly at concentrations from 10−6 to 10−4 M and collagen gel-contraction by the cells at 10−4 M, respectively. Rho-kinase inhibitors Y-27632 and HA1077 attenuated the gel-contraction at concentrations from 10−6 to 10−4 M, respectively. These Rho-kinase inhibitors attenuated cell migration at 10−7 M but enhanced the migration at 10−4 M, respectively. They altered cell morphology showing prominent peripheral actin bundles and sparse central stress fibers, in comparison with the calmodulin/MLCK inhibitors. Both ML-7 and Y-27632 attenuated phosphorylation of myosin regulatory light chain and cell attachment to extracellular substrate. ML-7 attenuated the activation of GTP-binding protein Rac, while Y-27632 did not. These findings suggest that the actomyosin-based cytoskeletal actions can be functionally diverse depending on the Rho-kinase-mediated pathway and the MLCK-mediated pathway. [Copyright &y& Elsevier]
- Subjects :
- *MYOFIBROBLASTS
*LIVER cells
Subjects
Details
- Language :
- English
- ISSN :
- 0006291X
- Volume :
- 305
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Biochemical & Biophysical Research Communications
- Publication Type :
- Academic Journal
- Accession number :
- 9713915
- Full Text :
- https://doi.org/10.1016/S0006-291X(03)00726-5