Abstract:
:Syndecan-4 is a ubiquitously expressed transmembrane heparan sulphate proteoglycan acting in concert with integrins in the formation of focal adhesions and stress fibres. Signalling events studied thus far suggest the formation of a ternary complex between syndecan-4, phosphatidylinositol 4,5-bisphosphate and protein kinase C alpha (PKCalpha). Syndecan-4 clustering at the cell surface has also been associated with RhoA-dependent signalling, but the relationship between PKCalpha and RhoA has not been resolved. Here we present evidence that syndecan-4, PKCalpha and RhoA are in a linear pathway necessary for the formation and maintenance of stress fibres in primary rat embryo fibroblasts. Inhibition of PKCalpha activity through the use of specific pharmacological inhibitors, a dominant-negative construct, or siRNA downregulation of protein levels, attenuated focal adhesion formation and the maintenance of stress fibres. However, these effects could be bypassed through independent activation of RhoA with lysophosphatidic acid, but not by clustering of syndecan-4 with ligand. Furthermore, inhibition of PKCalpha could block the increase in the GTP levels of RhoA induced by clustering of syndecan-4 at the cell surface. All these data point to a mechanism whereby syndecan-4 signals to RhoA in a PKCalpha-dependent manner and PKCalpha directly influences RhoA activity.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Dovas A,Yoneda A,Couchman JRdoi
10.1242/jcs.03020subject
Has Abstractpub_date
2006-07-01 00:00:00pages
2837-46issue
Pt 13eissn
0021-9533issn
1477-9137pii
119/13/2837journal_volume
119pub_type
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