Lookup NU author(s): Professor Tiago Outeiro
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2016 The Author(s).Protein glycation is an age-dependent posttranslational modification associated with several neurodegenerative disorders, including Alzheimer's and Parkinson's diseases. By modifying amino-groups, glycation interferes with folding of proteins, increasing their aggregation potential. Here, we studied the effect of pharmacological and genetic manipulation of glycation on huntingtin (HTT), the causative protein in Huntington's disease (HD). We observed that glycation increased the aggregation of mutant HTT exon 1 fragments associated with HD (HTT72Q and HTT103Q) in yeast and mammalian cell models. We found that glycation impairs HTT clearance thereby promoting its intracellular accumulation and aggregation. Interestingly, under these conditions autophagy increased and the levels of mutant HTT released to the culture medium decreased. Furthermore, increased glycation enhanced HTT toxicity in human cells and neurodegeneration in fruit flies, impairing eclosion and decreasing life span. Overall, our study provides evidence that glycation modulates HTT exon-1 aggregation and toxicity, and suggests it may constitute a novel target for therapeutic intervention in HD.
Author(s): Vicente Miranda H, Gomes MA, Branco-Santos J, Breda C, Lazaro DF, Lopes LV, Herrera F, Giorgini F, Outeiro TF
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Online publication date: 18/11/2016
Acceptance date: 21/10/2016
Date deposited: 20/12/2017
ISSN (print): 2045-2322
Publisher: Nature Publishing Group
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