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SIRT6 Reported to Destabilize APP
19 Dec 2024
Why is age the strongest risk factor for Alzheimer’s disease? In the December 10 Science Signaling, scientists led by Ning Bai, Difei Wang, Yu Di, and Liu Cao at China Medical University in Shenyang, and Hua Liu at Jinzhou Medical University, offer a clue. They report that levels of sirtuin 6, a member of a family of proteins deacetylases, drop with age in human and mouse brain.
SIRT6 deacetylates three lysine residues in amyloid precursor protein.
As SIRT6 falls with age, APP rises.
A SIRT6 activator reduced plaque burden in mice.
The AD connection? SIRT6 deacetylates three adjacent lysines in amyloid precursor protein, and this post-translational modification offers APP up to the ubiquitin-proteasome system for degradation. As SIRT6 peters out, more APP remains to generate Aβ peptides. Indeed, co-first authors Bai and Rong Cheng also found that a SIRT6 activator reined in plaque burden in an APP/PS1 mouse model of AD.
hTtps://www.alzforum.org/news/research-news/sirt6-reported-destabilize-app