Tau acetylation at K280 regulates tau phosphorylation

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Hyperphosphorylated tau accumulation is a hallmark of Alzheimer's disease (AD).
• Tau acetylation, especially at K280, is an emerging pathogenic modification linked to tau aggregation.
• The interplay between tau acetylation and phosphorylation remains largely unexplored in AD pathogenesis.

Purpose of the Study:

• To investigate the effect of tau acetylation at K280 on the tau phosphorylation profile.
• To elucidate the relationship between tau acetylation and phosphorylation in the context of Alzheimer's disease pathology.

Main Methods:

• Utilized SH-SY5Y neuroblastoma cells transfected with p300 acetyltransferase and tau to induce acetylation.
• Evaluated tau phosphorylation profiles using western blot analysis after inducing acetylation.
• Employed K280A-mutant tau to specifically block acetylation at K280 and assess its impact on phosphorylation.

Main Results:

• p300-induced tau acetylation increased phosphorylation at multiple sites (S199/202, S202/T205, T231, S422), but not S396.
• Blocking acetylation at K280 using K280A-mutant tau reversed increased phosphorylation at S202/T205, T231, and S422.
• Phosphorylation at S199/202 and S396 was not significantly affected by blocking K280 acetylation.

Conclusions:

• Tau acetylation differentially affects tau phosphorylation depending on the specific residue.
• Acetylation at K280 plays a critical role in determining tau phosphorylation at certain sites under pathological conditions.
• A complex interplay exists between tau acetylation and phosphorylation, warranting further investigation in Alzheimer's disease research.