Mitochondrial Oxidative Stress Causes Hyperphosphorylation of Tau
Author Information
Author(s): Simon Melov, Paul A. Adlard, Karl Morten, Felicity Johnson, Tamara R. Golden, Doug Hinerfeld, Birgit Schilling, Christine Mavros, Colin L. Masters, Irene Volitakis, Qiao-Xin Li, Katrina Laughton, Alan Hubbard, Robert A. Cherny, Brad Gibson, Ashley I. Bush
Primary Institution: Buck Institute for Age Research
Hypothesis
Increased mitochondrial oxidative stress modulates tau phosphorylation and amyloid deposition in Alzheimer's disease.
Conclusion
Mitochondrial oxidative stress is linked to hyperphosphorylation of tau, which can be prevented by antioxidant treatment.
Supporting Evidence
- Mice lacking SOD2 showed increased tau phosphorylation at specific residues.
- Antioxidant treatment normalized hyperphosphorylation levels in sod2 null mice.
- Genetic combination of sod2 knockout and APP overexpression exacerbated amyloid burden.
Takeaway
The study found that stress in the mitochondria can make a protein called tau get too sticky, which is a problem in Alzheimer's disease, but giving antioxidants can help fix this.
Methodology
The study used sod2 null mice treated with different doses of a catalytic antioxidant to assess tau phosphorylation levels.
Potential Biases
Potential bias in interpreting results due to the specific genetic background of the mouse models used.
Limitations
The study primarily focused on a specific mouse model and may not fully represent human Alzheimer's disease pathology.
Participant Demographics
Mice of both sexes were used in the study.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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