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• W2035870763 abstract "In previous studies we have shown that the ability of murine tumor cells to metastasize in situ is directly linked to expression of -GlcNAc beta 1-6Man alpha 1-6Man beta 1-branched complex-type Asn-linked oligosaccharides in tumor-cell glycoproteins. Here we demonstrate that cell-surface expression of beta 1-6 branched oligosaccharides in metastatic tumor cells is specifically associated with increased invasion of human amnion basement membranes in vitro. Compared to nonmetastatic SP1 murine mammary carcinoma cells, 2 metastatic sublines expressed higher levels of beta 1-6 branched oligosaccharides and were found to be invasive but poorly adhesive on the amnion basement membrane. Swainsonine, a non-toxic inhibitor of Asn-linked oligosaccharide processing which blocks the pathway prior to initiation of the beta 1-6 linked antenna, blocked metastatic tumor-cell invasion and increased adhesiveness. Swainsonine and the metalloprotease inhibitor O-phenanthroline inhibited invasion, apparently via independent mechanisms. O-phenanthroline did not affect tumor-cell adhesion to the amnion basement membrane and swainsonine did not block secretion of metalloproteases, beta-hexosaminadase or tissue plasminogen activator activity by the tumor cells. These results suggest that tumor-cell invasion of basement membranes requires both secretion of hydrolase activities and expression of beta 1-6 branched complex-type oligosaccharides at the tumor cell surface, such oligosaccharides being associated with reduced tumor-cell adhesion to extracellular matrix." @default.
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• W2035870763 date "1989-10-15" @default.
• W2035870763 modified "2023-09-23" @default.
• W2035870763 title "Evidence that β1-6 branched Asn-linked oligosaccharides on metastatic tumor cells facilitate invasion of basement membranes" @default.
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• W2035870763 doi "https://doi.org/10.1002/ijc.2910440422" @default.
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