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Targeted brain-specific tauopathy compromises peripheral skeletal muscle integrity and function.

Bryan Alava1,2, Gabriela Hery2, Silvana Sidhom1

  • 1Department of Physiology and Aging, University of Florida, Gainesville, Florida, 32610, USA.

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Summary

Tauopathy, a neurodegenerative disease, causes muscle weakness. This study reveals skeletal muscle abnormalities and reduced contractile function in a mouse model, suggesting peripheral effects contribute to weakness.

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Area of Science:

  • Neuroscience
  • Muscle Physiology

Background:

  • Tauopathies are neurodegenerative disorders characterized by tau protein aggregation and cognitive deficits.
  • Clinical observations suggest a link between tauopathy and muscle weakness, but the underlying mechanisms remain unclear.

Approach:

  • Investigated skeletal muscle in a mouse model (AAV8-P301L) of primary tauopathy.
  • Assessed grip strength, muscle histology, gene expression, and soleus muscle contractile function.

Key Points:

  • Mice with tauopathy exhibited grip strength deficits and abnormal skeletal muscle histology.
  • Spatially resolved gene expression analysis revealed alterations in genes related to sarcomeric proteins.
  • Specific force production in the soleus muscle was significantly reduced in male tauopathy mice.

Conclusions:

  • Tauopathy leads to peripheral skeletal muscle abnormalities.
  • These muscle changes contribute to the overall weakness observed in tauopathy patients.