Yb. Lim et al., Disruption of actin cytoskeleton induces chondrogenesis of mesenchymal cells by activating protein kinase C-alpha signaling, BIOC BIOP R, 273(2), 2000, pp. 609-613
Citations number
19
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Disruption of actin cytoskeleton with cytochalasin D has been known to indu
ce chondrogenic differentiation of chick embryo Limb bud mesenchymal cells.
However, the mechanism(s) for the induction of chondrogenesis by cytochala
sin D is not yet-clearly known, In the present study, we examined possible
involvement of protein kinase C (PKC) and extracellular signal-regulated pr
otein kinase (Erk-1) in chondrogenesis of mesenchymal cells induced by disr
uption of actin cytoskeleton. Disruption of actin cytoskeleton with cytocha
lasin D or latrunculin B induced chondrogenesis of mesenchymal cells cultur
ed at subconfluent cell density, as determined by type II collagen expressi
on. Among the expressed PKC isoforms, cytochalasin D dramatically increased
expression and activation of PKC alpha in a dose-dependent manner, and inh
ibition or downregulation of PKC alpha blocked cytochalasin D-induced chond
rogenesis. Cytochalasin D also downregulated Erk-1 phosphorylation that is
associated with chondrogenesis. Our results, therefore, suggest that disrup
tion of actin cytoskeleton induces chondrogenesis of mesenchymal cells by a
ctivating PKC alpha and by inhibiting Erk-1 signaling. (C) 2000 Academic Pr
ess.