Laminin-dependent and laminin-independent adhesion of human melanoma cells to sulfatides.
Laminin-dependent and laminin-independent adhesion of human melanoma cells to sulfatides.
复制标题
人黑色素瘤细胞对硫苷脂的层粘连蛋白依赖性和层粘连蛋白非依赖性粘附。
作者:
D. Roberts;U. Wewer;L. Liotta;V. Ginsburg
Sulfatides (galactosylceramide-I3-sulfate) but not neutral glycolipids or gangliosides adsorbed on plastic promote adhesion of the human melanoma cell line G361. Direct adhesion of G361 cells requires densities of sulfatide greater than 1 pmol/mm2. In the presence of laminin, however, specific adhesion of G361 cells to sulfatide or seminolipid (galactosylalkylacyl-glycerol-I3-sulfate) but not to other lipids is strongly stimulated and requires only 25 fmol/mm2 of adsorbed lipid. The effects of laminin and sulfatide on adhesion are synergistic, suggesting that laminin is mediating adhesion by cross-linking receptors on the melanoma cell surface to sulfatide adsorbed on the plastic. Although thrombospondin binds to sulfatides and G361 cells, it does not enhance, but rather inhibits direct and laminin-dependent G361 cell adhesion to sulfatide. In contrast, C32 melanoma cells also adhere specifically to sulfatide, but adhesion of these cells is not enhanced by laminin or inhibited by antibodies to laminin that block laminin-dependent adhesion of G361 cells. Thrombospondin is a potent inhibitor of C32 cell adhesion to sulfatide. Fucoidan, which inhibits laminin binding to sulfatide, inhibits laminin-dependent adhesion of G361 cells by 50% at 0.2 micrograms/ml. Several other tumor cell lines also attach directly on sulfatide-coated surfaces. Laminin stimulates adhesion to sulfatide of three of the six cell lines tested. The ability of laminin to promote adhesion of tumor cells to sulfatide suggests that binding to sulfatide could participate in laminin-mediated cell-cell adhesion. Thus, many tumor cell lines can attach on sulfatide substrates using endogenous sulfatide binding proteins, and in some cells laminin but not thrombospondin can promote tumor cell adhesion to sulfatide.
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DOI:
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发表时间:
1985
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Hiserodt,JC;Laybourn,KA;Varani,J
通讯作者:
Varani,J
影响因子:
4
作者:
Glabe,CG;Yednock,T;Rosen,SD
通讯作者:
Rosen,SD
DOI:
--
发表时间:
1984
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Spangrude,GJ;Braaten,BA;Daynes,RA
通讯作者:
Daynes,RA
DOI:
--
发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Blackburn,CC;Schnaar,RL
通讯作者:
Schnaar,RL
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Blackburn,CC;Swank-Hill,P;Schnaar,RL
通讯作者:
Schnaar,RL