1. SIRT1 regulates O-GlcNAcylation of tau through OGT
- Author
-
Lu Shu, Xiaomin Yin, Jia Wang, Qun Gu, Ziqi Xu, Wei Qian, Nana Jin, Qin Huang, Dandan Chu, and Fei Liu
- Subjects
Aging ,Glycosylation ,tau Proteins ,CREB ,N-Acetylglucosaminyltransferases ,phosphorylation of tau ,Acetylglucosamine ,O glcnacylation ,Rats, Sprague-Dawley ,SIRT1 ,Sirtuin 1 ,Chlorocebus aethiops ,medicine ,Animals ,Humans ,Phosphorylation ,Cyclic AMP Response Element-Binding Protein ,Transcription factor ,O-GlcNAcylation of tau ,chemistry.chemical_classification ,Cellular transcription ,biology ,Cell Biology ,Human brain ,Cell biology ,Rats ,enzymes and coenzymes (carbohydrates) ,medicine.anatomical_structure ,Enzyme ,HEK293 Cells ,chemistry ,Sirtuin ,COS Cells ,biology.protein ,OGT ,Alzheimer’s disease ,Research Paper - Abstract
Tau is modified with O-GlcNAcylation extensively in human brain. The O-GlcNAcylation levels of tau are decreased in Alzheimer's disease (AD) brain. Sirtuin type 1 (SIRT1) is an enzyme that deacetylates proteins including transcriptional factors and associates with neurodegenerative diseases, such as AD. Aberrant SIRT1 expression levels in AD brain is in parallel with the accumulation of tau. cAMP response element binding protein (CREB), a cellular transcription factor, plays a critical role in learning and memory. In this present study, we found SIRT1 deacetylates CREB and inhibits phosphorylation of CREB at Ser133. The inactivated CREB suppresses OGT expression and therefore decreases the O-GlcNAcylation of tau and thus increases the phosphorylation of tau at specific sites. These findings suggest that SIRT1 may be a potential therapeutic target for treating tauopathies.
- Published
- 2020