title: Loss of expression of N-acetylglucosaminyltransferase Va results in altered gene expression of glycosyltransferases and galectins.
abstract: We isolated mouse embryo fibroblasts (MEFs) from N-acetylglucosaminyltransferase Va (GnT-Va) knockout mice and studied the effects of loss of expression of GnT-Va on asparagine-linked glycans (N-glycan) synthesis and the gene expression of groups of glycosyltransferases and galectins. Loss of GnT-Va expression caused aberrant expression of several N-glycan structures, including N-linked beta(1,6) branching, poly-N-lactosamine, bisecting N-acetylglucosamine (GlcNAc) and sialic acid. Using quantitative reverse transcriptase-PCR (qRT-PCR), altered gene expression of several groups of glycosyltransferases and galectins was observed in GnT-Va null MEFs, supporting the observed changes in N-glycan structures. These results suggest that genetic disruption of GnT-Va ultimately resulted in altered MEFs gene expression and decreased tumor progression associated with loss of GnT-Va observed may result in part from a combination of effects from these altered gene expressions.
authors.affiliation: Department of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, 315 Riverbend Road, University of Georgia, Athens, GA 30602, USA.
authors.forename: Hua-Bei
authors.initials: HB
authors.lastname: Guo
authors.forename: Alison
authors.initials: A
authors.lastname: Nairn
authors.forename: Kyle
authors.initials: K
authors.lastname: Harris
authors.forename: Matthew
authors.initials: M
authors.lastname: Randolph
authors.forename: Gerardo
authors.initials: G
authors.lastname: Alvarez-Manilla
authors.forename: Kelley
authors.initials: K
authors.lastname: Moremen
authors.forename: Michael
authors.initials: M
authors.lastname: Pierce
mesh_terms: D000818:Animals; D001483:Base Sequence; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D017931:DNA Primers; D037161:Galectins / Q000235:genetics*; D015971:Gene Expression Regulation, Enzymologic; D051379:Mice; D018345:Mice, Knockout; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D037161:Galectins; D017351:N-Acetylglucosaminyltransferases; C052254:alpha-1,6-mannosylglycoprotein beta 1,6-N-acetylglucosaminyltransferase