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• W2279609389 abstract "Multiple mechanisms are involved in the resistance of cancer cells to cisplatin, including the expression of multidrug resistance-associated protein (MRP) and enhanced DNA repair. Here, we report findings to show that oligosaccharide changes in alpha5beta1 integrin are associated with cisplatin resistance in a head and neck squamous cell carcinoma cell line, HSC-2. Cisplatin-resistant HSC-2 (HSC-2/CR) cells were established by stepwise treatment with various concentrations of cisplatin. The oligosaccharides containing beta1, 6-N-acetylglucosamine (beta1-6GlcNAc) branching, detected by leukoagglutinating phytohemagglutinin (L(4)-PHA) lectin blot, were found to be dramatically decreased in alpha5beta1 integrin immunoprecipitated from HSC-2/CR cells. To better understand the mechanisms underlying cisplatin resistance and oligosaccharide alteration, we analyzed the downstream signaling of alpha5beta1 integrin, one of the target glycoproteins of beta1-6GlcNAc transferase [UDP-GlcNAc:alpha-D-mannoside beta1, 6-N-acetylglucosaminyltransferase (GnT-V)]. Cell adhesion to fibronectin and phosphorylation of focal adhesion kinase (FAK), which are associated with alpha5beta1 integrin and involved in a cell survival signaling, were found to be increased in the cisplatin-resistant cells. Enhancement of the inhibition of cell adhesion and FAK phosphorylation also support the above data in GnT-V transfectants of HSC-2 cells. Interestingly, the differences in sensitivity to cisplatin and FAK phosphorylation between cisplatin-sensitive and -resistant cells were completely abolished by treatment with a neutral antibody of alpha5beta1 integrin. These results suggest that modification of oligosaccharides of alpha5beta1 integrin represents one of the possible mechanisms of drug resistance in head and neck cancer cells." @default.
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• W2279609389 date "2003-11-01" @default.
• W2279609389 modified "2023-09-23" @default.
• W2279609389 title "Involvement of oligosaccharide changes in alpha5beta1 integrin in a cisplatin-resistant human squamous cell carcinoma cell line." @default.
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