title: N-acetylglucosaminyltranferase VB expression enhances beta1 integrin- dependent PC12 neurite outgrowth on laminin and collagen.
abstract: N-acetylglucosaminyltransferase VB (GnT-VB, -IX) is a newly discovered glycosyltransferase expressed exclusively in high levels in neuronal tissue during early development. Its homolog, GnT-V, is expressed in many tissues and modulates cell-cell and cell-matrix adhesion. The ability of GnT-VB to regulate cell-matrix interactions was initially investigated using the rat pheochromocytoma PC12 neurite outgrowth model. PC12 cells stably transfected with GnT-VB consistently showed an enhanced rate of nerve growth factor (NGF)-induced neurite outgrowth on collagen and laminin substrates. Levels of TrkA receptor phosphorylation and downstream ERK activation induced by NGF were not influenced by GnT-VB expression. No significant difference was observed in the rate of neurite outgrowth when cells were cultured on non-coated culture dishes, indicating that integrin-ECM interaction is required for the stimulatory effects. Neurite outgrowth induced by manganese-dependent activation of beta1 integrin on collagen and laminin substrates, however, showed a significant increase in neurite length for the PC12/GnT-VB cells, compared with control cells, suggesting that the enhancement is most likely mediated by alteration of beta1 integrin-ECM interaction by GnT-VB. These results demonstrate that GnT-VB expression can modulate the rate of neurite outgrowth by affecting beta1 integrin-ECM interaction.
authors.affiliation: The Complex Carbohydrate Research Center and Department of Biochemistry and Molecular Biology, the University of Georgia, Athens, Georgia 30602-4712, USA.
authors.forename: Intaek
authors.initials: I
authors.lastname: Lee
authors.forename: Hua-Bei
authors.initials: HB
authors.lastname: Guo
authors.forename: Maria
authors.initials: M
authors.lastname: Kamar
authors.forename: Karen
authors.initials: K
authors.lastname: Abbott
authors.forename: Karolyn
authors.initials: K
authors.lastname: Troupe
authors.forename: Jin-Kyu
authors.initials: JK
authors.lastname: Lee
authors.forename: Gerardo
authors.initials: G
authors.lastname: Alvarez-Manilla
authors.forename: Michael
authors.initials: M
authors.lastname: Pierce
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology*; D003094:Collagen / Q000378:metabolism / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects / Q000502:physiology; D005109:Extracellular Matrix / Q000378:metabolism*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D006031:Glycosylation / Q000187:drug effects; D006801:Humans; D019012:Integrin beta1 / Q000378:metabolism*; D007797:Laminin / Q000378:metabolism / Q000494:pharmacology; D008345:Manganese / Q000378:metabolism / Q000494:pharmacology; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D016501:Neurites / Q000187:drug effects / Q000378:metabolism*; D016716:PC12 Cells; D051381:Rats; D020917:Receptor, trkA / Q000378:metabolism; D014162:Transfection; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
chemical_list: D019012:Integrin beta1; D007797:Laminin; D009419:Nerve Tissue Proteins; D008345:Manganese; D003094:Collagen; C479741:MGAT5B protein, human; D017351:N-Acetylglucosaminyltransferases; D020917:Receptor, trkA; D048049:Extracellular Signal-Regulated MAP Kinases