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- W98281195 abstract "The cystic fibrosis transmembrane conductance regulator (CFTR) is commonly mutated in cystic fibrosis to the delta F508 CFTR. CFTR has been shown to function as a adenosine 3',5'-cyclic monophosphate-dependent Cl- channel at the cell surface, and there is evidence to suggest that CFTR may also have a role in transmembrane Cl- conductance in intracellular membrane compartments. Studies using cells from cystic fibrosis patients or heterologous expression systems have demonstrated that defective Cl- conductance at the cell surface and defective acidification of the Golgi compartment are associated with the presence of mutant forms of CFTR. It is possible that mutation of CFTR could also result in altered Golgi function, consistent with reports of changes in the glycosylation of cell surface and secreted glycoproteins in cystic fibrosis. Glycosylation of cell surface glycoproteins, particularly levels of sialylation, may also be related to the increased binding of Pseudomonas to cystic fibrosis cells. The current study was undertaken to compare the sialylation of cell surface glycoconjugates in heterologous cells overexpressing normal CFTR or delta F508 CFTR. The presence of sialylated residues on cells was assessed by the surface binding of the specific lectins, wheat germ agglutinin and elderberry bark lectin. A fluorescent cholera toxin B subunit probe was used to measure surface binding to sialylated gangliosides in transfected cells. Our studies show that cells lacking CFTR and cells expressing normal CFTR have unaltered levels of sialylation. In contrast, cells expressing the delta F508 CFTR have significantly decreased amounts of sialylated glycoproteins and gangliosides on the cell surface.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W98281195 date "1994-02-01" @default.
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- W98281195 title "Heterologous expression of delta F508 CFTR results in decreased sialylation of membrane glycoconjugates" @default.
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- W98281195 doi "https://doi.org/10.1152/ajpcell.1994.266.2.c360" @default.
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