Nuclear tau, a key player in neuronal DNA protection

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Tau protein is primarily known as a microtubule-associated protein.
• Nuclear localization of Tau has been observed, but its function remains unclear.
• Neurodegenerative disorders like Alzheimer disease are linked to Tau pathology.

Purpose of the Study:

• To investigate the function of nuclear Tau in neurons.
• To determine Tau's role in cellular response to stress.
• To elucidate the protective mechanisms of nuclear Tau.

Main Methods:

• Induction of oxidative and heat stress in neuronal cultures.
• Chromatin immunoprecipitation assays to assess Tau-DNA interaction.
• Comet assays to evaluate DNA damage in wild-type and Tau-deficient cells.
• Overexpression of nuclear-targeted Tau for rescue experiments.

Main Results:

• Acute oxidative and heat stress trigger dephosphorylated Tau accumulation in neuronal nuclei.
• Heat stress enhances the interaction between endogenous Tau and neuronal DNA.
• Tau significantly protects neuronal genomic DNA against heat stress-induced damage.
• Overexpression of nuclear Tau rescues heat stress-induced DNA damage in Tau-deficient cells.

Conclusions:

• Nuclear Tau plays a crucial role in the early cellular stress response.
• Tau acts as a protective factor for neuronal genomic DNA against environmental stressors.
• This finding uncovers a novel function for nuclear Tau beyond its role in microtubule stabilization.