Laminin-dependent and laminin-independent adhesion of human melanoma cells to sulfatides.

Laminin-dependent and laminin-independent adhesion of human melanoma cells to sulfatides.
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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。

DOI:
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发表时间:
1988
期刊:
影响因子:
11.2
通讯作者:
V. Ginsburg
V. Ginsburg
中科院分区:
医学1区
文献类型:
--
作者:
D. Roberts;U. Wewer;L. Liotta;V. Ginsburg

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硫酸脂(半乳糖神经酰胺-I3-硫酸盐)而不是中性糖脂或神经节苷脂吸附在塑料上促进人黑素瘤细胞系G361的粘附。G361细胞的直接粘附需要大于1 pmol/mm 2的硫苷脂密度。然而,在层粘连蛋白的存在下,G361细胞对硫苷脂或胆固醇脂(半乳糖基烷基酰基-甘油-I3-硫酸酯)而不是对其它脂质的特异性粘附被强烈刺激,并且仅需要25 fmol/mm 2的吸附脂质。层粘连蛋白和硫苷脂对粘附的作用是协同的,表明层粘连蛋白通过将黑素瘤细胞表面上的受体交联到吸附在塑料上的硫苷脂来介导粘附。虽然血小板反应蛋白结合到硫苷脂和G361细胞,但它不增强,而是抑制直接和层粘连蛋白依赖性G361细胞粘附到硫苷脂。相反,C32黑色素瘤细胞也特异性地粘附于硫苷脂,但是这些细胞的粘附不被层粘连蛋白增强,也不被阻断G361细胞的层粘连蛋白依赖性粘附的层粘连蛋白抗体抑制。血小板反应蛋白是C32细胞与硫苷脂粘附的有效抑制剂。岩藻依聚糖抑制层粘连蛋白与硫苷脂的结合,在0.2微克/毫升时抑制G361细胞的层粘连蛋白依赖性粘附50%。其他几种肿瘤细胞系也直接附着在硫酸脂涂层表面上。层粘连蛋白刺激粘附到所测试的六个细胞系中的三个的硫苷脂。层粘连蛋白促进肿瘤细胞与硫苷脂粘附的能力表明,与硫苷脂的结合可能参与层粘连蛋白介导的细胞-细胞粘附。因此,许多肿瘤细胞系可以使用内源性硫苷脂结合蛋白附着在硫苷脂底物上,并且在一些细胞中,层粘连蛋白而不是血小板反应蛋白可以促进肿瘤细胞与硫苷脂的粘附。
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.
小鼠自然杀伤(NK)淋巴细胞表面层粘连蛋白样物质的表达及其在NK识别肿瘤靶细胞中的作用。
DOI: --
发表时间: 1985
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影响因子: --
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DOI: --
发表时间: 1984
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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DOI: --
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影响因子: --
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DOI: --
发表时间: 1986
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