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Biochem J. Apr 15, 2002; 363(Pt 2): 201–209.
PMCID: PMC1222468

The role of syndecan-2 in regulation of actin-cytoskeletal organization of Lewis lung carcinoma-derived metastatic clones.

Abstract

Syndecans, a family of transmembrane heparan sulphate proteoglycans, contribute to various biological processes, including adhesion, motility, proliferation, differentiation and morphogenesis. We document here the involvement of syndecan-2 acting alone or co-operatively with integrin alpha5beta1, for regulation of actin-cytoskeletal organization on cell adhesion to fibronectin, using fibronectin-recombinant polypeptides containing the ligands for either or both of these receptors as substrata. Lewis lung carcinoma-derived low-metastatic P29 cells binding to the substrata by both receptors formed actin stress fibres, whereas those binding by syndecan-2 or integrin alpha5beta1 alone formed filopodia or cortex actin. In contrast, higher metastatic LM66-H11 cells formed cortex actin even on substrata containing both ligands. Northern-blot and flow-cytometric analyses revealed that syndecan-2 expression in LM66-H11 cells was significantly lower (1/4.5 in mRNA and 1/8 in cell-surface expression) than in P29 cells, whereas expression levels of integrin alpha5beta1 and other syndecans were similar in both cell types. These results suggest that the failure of LM66-H11 to form stress fibres is due to a lower expression of syndecan-2 than that due to a threshold for its function. This was confirmed by the finding that overexpression of syndecan-2 by transfection of its cDNA into LM66-H11 cells caused the formation of stress fibres on the fibronectin substratum. These in vitro cellular responses of the two clones might reflect their in vivo situation in primary tumours in which P29 cells with a stroma-inducing capacity were immediately surrounded by fibronectin-rich matrix formed by the induced stromal cells, whereas LM66-H11 cells without such capacity were not surrounded by a similar matrix.

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