Abstract
We examined the post-translational modification of intracellular proteins by β-O-linked N-acetylglucosamine (O-GlcNAc) with regard to neurofilament phosphorylation in the developing chick optic tectum. A regulated developmental pattern of O-GlcNAcylation was discovered in the developing brain. Most notably, discernible staining occurs along radial glial filaments but not along neuronal filaments in vivo. Immunohistochemical analyses in sections of progressive stages of development suggest upregulation of O-GlcNAc in the ependyma, tectofugal neuron bodies, and radial glial processes, but not in axons. In contrast, double-label immunostaining of monolayer cultures made from dissociated embryonic day (E) 7 optic tecta revealed O-GlcNAcylation of most axons. Labeling of brain sections together with Western blot analyses showed O-GlcNAc modification of a few discrete proteins throughout development, and suggested vimentin as the protein in radial glia. Immunoprecipitation of vimentin from E9 whole brain lysates confirmed O-GlcNAcylation of vimentin in development. These results indicate a regulated pattern of O-GlcNAc modification of vimentin filaments, which in turn suggests a role for O-GlcNAc-modified intermediate filaments in radial glia, but not in neurons during brain development. The control mechanisms that regulate this pattern in vivo, however, are disrupted when cells are placed in vitro.
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Acknowledgments
The authors thank Dr. Gerald Hart for the kind gift of anti-O-GlcNAc monoclonal antibody and Dr. Gudrun Bennett for the kind gift of anti-NFM 160 polyclonal antibody. A.M.F. was supported by Howard Hughes Medical Institute and Charles Peter White fellowships in the University of Delaware Undergraduate Research Program. This research was supported in part by a grant to D.S.G. from NINDS (NS40317).
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Farach, A.M., Galileo, D.S. O-GlcNAc modification of radial glial vimentin filaments in the developing chick brain. Brain Cell Bio 36, 191–202 (2008). https://doi.org/10.1007/s11068-008-9036-5
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DOI: https://doi.org/10.1007/s11068-008-9036-5