Cooperation of syndecan-2 and syndecan-4 among cell surface heparan sulfate proteoglycans in the actin cytoskeletal organization of Lewis lung carcinoma cells.
Syndecan-2 cooperates with integrin alpha 5 beta 1 in cell adhesion to a fibronectin substratum and regulates actin cytoskeletal organization in an expression level-dependent manner; Lewis lung carcinoma-derived P29 cells with high expression form stress fibers, whereas the same tumor-derived low expressers, LM66-H11 cells, form cortex actin [Munesue, S., Kusano, Y., Oguri, K., Itano, N., Yoshitomi, Y., Nakanishi, H., Yamashina, I., and Okayama, M. (2002) BIOCHEM: J. 363, 201-209]. In this study we examined the participation of other cell surface heparan sulfate proteoglycans in this signaling. The two clones expressed syndecan-1, -2 and -4, and glypican-1 at similar levels except for syndecan-2. Treatment of cells with phosphatidylinositol-specific phospholipase C or immobilized anti-syndecan-1 antibodies demonstrated that neither glypican-1 nor syndecan-1 was involved in this signaling, indicating that individual cell surface heparan sulfate proteoglycans have functional specificity. Stimulation with immobilized anti-syndecan-2 or -4 antibodies induced stress fiber formation in P29 cells but not in LM66-H11 cells, despite the similar levels of syndecan-4 expression, suggesting that stress fiber formation required a threshold expression level of syndecan-2 acting downstream of syndecan-4. This was confirmed by cells in which syndecan-2 expression was artificially suppressed by antisense mRNA oligonucleotide treatment or elevated by cDNA transfection. This is the first report demonstrating that syndecan-2 and -4 cooperate in situ in actin cytoskeletal organization.
Clinical Research Center, Nagoya National Hospital, 4-1-1 Sannomaru, Naka-ku, Nagoya 460-0001.
Yuri
Y
Kusano
Yasuo
Y
Yoshitomi
Seiichi
S
Munesue
Minoru
M
Okayama
Kayoko
K
Oguri
D000199:Actins / Q000096:biosynthesis / Q000235:genetics; D000818:Animals; D018827:Carcinoma, Lewis Lung / Q000235:genetics / Q000378:metabolism*; D003599:Cytoskeleton / Q000235:genetics / Q000378:metabolism*; D019812:Heparan Sulfate Proteoglycans / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D011509:Proteoglycans / Q000096:biosynthesis* / Q000235:genetics; D053669:Syndecan-2; D053671:Syndecan-4
D000199:Actins; D019812:Heparan Sulfate Proteoglycans; D008562:Membrane Glycoproteins; D011509:Proteoglycans; C508245:SDC2 protein, human; C508304:SDC4 protein, human; C508246:Sdc2 protein, mouse; C508306:Sdc4 protein, mouse; D053671:Syndecan-4; D053669:Syndecan-2