Abstract
The relations between the structure of cell surface N-glycans to cell behaviors were studied in H7721 human hepatocarcinoma cell line, which predominantly expressed complex-type N-glycans on the surface. 1-Deoxymannojirimycin (DMJ) and swaisonine (SW), the specific inhibitor of Golgi α-mannosidase II or I, were selected to block the processing of N-glycans at the steps of high mannose and hybrid type respectively. All-trans retinoic acid (ATRA) and antisense cDNA of N-acetylglucosaminyltransferase-V (GnT-V) were used to suppress the expression of GnT-V and decreased the GlcNAcβ1,6-branching or tri-/tetra-antennary structure of surface N-glycans. The structural alterations of N-glycans were verified by sequential lectin affinity chromatography of [3H] mannose-labeled glycans isolated from the cell surface. The cell adhesions to fibronectin (Fn) and human umbilical vein epithelial cell (HUVEC), as well as cell migration (including chemotaxis and invasion) were selected as the parameters of cell behaviors. It was found that cell adhesion and migration were significantly decreased in SW and DMJ treated cells, suggesting that complex type N-glycan is critical for the above cell behaviors. ATRA and antisense GnTV enhanced cell adhesion to Fn but reduce cell adhesion to HUVEC and cell migration. These results reveal that cell surface complex-type N-glycans with GlcNAcβ1,6 branch are more effective than those without this branch in the cell adhesion to HUVEC and cell migration, but N-glycan without GlcNAcβ1,6-branch is the better one in mediating the cell adhesion to Fn. The integrin α5β1 (receptor of Fn) on cell surface was unchanged by DMJ and SW. In contrast, ATRA up regulated α5, but not β1, and antisense GnT-V decreased both α5 and β1. This findings suggest that both the structure of N-glycan and the expression of integrin on cell surface are two of the important factors in the determination of cell adhesion to Fn, a complex biological process.
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Zhang, Y., Zhao, Jh., Zhang, Xy. et al. Relations of the type and branch of surface N-glycans to cell adhesion, migration and integrin expressions. Mol Cell Biochem 260, 137–146 (2004). https://doi.org/10.1023/B:MCBI.0000026065.84798.62
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DOI: https://doi.org/10.1023/B:MCBI.0000026065.84798.62