HDAC7 acts as a structural scaffold bringing GSK-3β and tau into direct contact, triggering GSK-3β acetylation at lysine 15, kinase stabilization, and tau hyperphosphorylation in a tauopathy mouse model. Neuronal deletion of HDAC7 lowered GSK-3β activity, restored synaptic integrity, and reversed cognitive deficits. The scaffolding function operates independently of HDAC7's enzymatic deacetylase activity, which reframes how this protein family might be targeted in neurodegeneration.
Key Points
- HDAC7 physically links GSK-3β and tau, activating the kinase
- Scaffolding drives pathology independently of deacetylase enzymatic activity
- Neuronal HDAC7 deletion restored synapses and reversed cognitive deficits
Longevity Analysis
Tau hyperphosphorylation has long been treated as a downstream consequence of kinase overactivity, but the controlling variable here is proximity — a scaffold protein that holds enzyme and substrate together long enough for damage to become self-reinforcing. Removing that interference restored synaptic architecture and cognition in animals, which places structural protein interactions alongside enzyme inhibition as a target for preserving neural function. For the cells that must maintain and repair neural tissue across decades, selectively upregulated HDAC7 in tau-bearing neurons also represents a measurable signal of pathology rather than a generic marker of aging.
Original published by Wiley Aging Cell, by Shifeng Xiao, Lijuan Wu, Wenfei Qiao, Ruizhu Yue, Xing Guo, Chengjia Li, Yingling Tang, Jinwang Ye .