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- W126127139 abstract "The most prominent neuropathologic hallmarks of Huntington disease (HD) are cortical and striatal perinuclear cytoplasmic aggregates and intranuclear inclusions of mutant huntingtin. Our laboratory previously demonstrated that huntingtin protein colocalizes with transglutaminase 2 and its product, the ε-(γ-glutamyl)lysine bond in intranuclear inclusions in HD frontal cortex. We also found that transglutaminase 2 cross-links N-terminal fragments of mutant huntingtin (htt-N63-148Q-myc) in cells in culture. We now report a significant increase in transglutaminase 2 mRNA in HD cortex (225% of controls) and striatum (399% of controls). Expression of the short transglutaminase 2 mRNA splice variant was not detectable in HD, although previous studies demonstrated upregulation in Alzheimer disease and progressive supranuclear palsy. Cells co-transfected with GFP-tagged transglutaminase 1, 2, or 3 and htt-N63-148Q-myc exhibit increased cross-linked huntingtin in the insoluble fraction of cell lysates. Treatment of cells with cystamine, a chemical inhibitor of transglutaminase, decreased aggregated and cross-linked huntingtin and increased viability of cells that were transfected with transglutaminase 2 and htt-N63-148Q-myc. These data suggest that transglutaminase 1, 2, and 3 could be involved in cross-linking of huntingtin into intranuclear inclusions in HD and that inhibiting transglutaminase should be explored as a potential treatment strategy for HD." @default.
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- W126127139 date "2005-01-01" @default.
- W126127139 modified "2023-10-17" @default.
- W126127139 title "Mutant Huntingtin Protein: A Substrate for Transglutaminase 1, 2, and 3" @default.
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- W126127139 doi "https://doi.org/10.1093/jnen/64.1.58" @default.
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