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Basic Science and Pathogenesis.

Larissa J Strath1, Airam Vivanco-Estela1, Jinying Yang1

  • 1University of Florida, Gainesville, FL, USA.

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Summary
This summary is machine-generated.

Mice with tau pathology showed increased pain sensitivity linked to mitochondrial and autophagy dysfunction. These findings highlight early-stage tauopathy mechanisms relevant to dementia and chronic pain.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Dementia and chronic pain comorbidities are under-researched.
  • Tauopathies, linked to dementia, involve tau aggregation, mitochondrial dysfunction, and impaired autophagy.
  • Mitochondrial changes correlate with pain sensitivity and chronic pain.

Purpose of the Study:

  • Investigate the link between mitochondrial complexes, autophagy proteins, and pain-like behaviors in the rTg4510 tauopathy mouse model.
  • Examine sex-specific differences in these relationships.

Main Methods:

  • Utilized wildtype, 2xTau Tg4510, and 13xTau rTg4510 mice (male and female) for pain testing (reflexive and non-reflexive assays).
  • Analyzed protein expression of mitochondrial complexes (I-V), chaperones (Hsp60, Hsp90), and autophagy markers (LC3, Beclin-1) via Western blot.
  • Employed ANOVA and correlation analyses to assess group differences and behavior-protein associations.

Main Results:

  • 2xTau Tg4510 mice exhibited significant downregulation of mitochondrial complex II, autophagy proteins, and chaperones compared to wildtypes.
  • 2xTau Tg4510 mice showed increased sensitivity in multiple pain assays.
  • Mitochondrial, autophagy, and chaperone protein levels significantly correlated with pain behaviors, particularly in 2xTau Tg4510 mice, in a sex-dependent manner.

Conclusions:

  • The rTg4510 model demonstrates mitochondrial and autophagy dysregulation relevant to tauopathies and dementia.
  • Aberrant mitochondrial and autophagy pathways are associated with pain-like behaviors in early-stage tauopathy.
  • Findings offer insights into the interplay between pain, mitochondrial function, and autophagy in tauopathies.