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Summary
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Histone deacetylase (HDAC) inhibition promotes TDP43 aggregation and mislocalization in neurodegenerative diseases like ALS and FTLD. Acetylation drives disulfide-linked TDP43 oligomers, suggesting a new therapeutic target.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • TDP43 proteinopathies, including ALS and FTLD, involve pathological TDP43 aggregation and mislocalization, leading to neurodegeneration.
  • The precise molecular mechanisms driving TDP43 aggregation are not fully understood.
  • Histone deacetylases (HDACs) regulate protein acetylation, a process linked to protein aggregation in neurodegenerative diseases.

Purpose of the Study:

  • To investigate the role of HDAC inhibition and acetylation in TDP43 aggregation, focusing on mislocalization and oligomerization.
  • To elucidate the impact of HDACs on TDP43's nuclear retention and cytoplasmic translocation.
  • To determine the aggregation mechanisms, particularly the role of disulfide bonds versus phosphorylation.

Main Methods:

  • Established a TDP43-BiFC cell model for real-time visualization of TDP43 oligomerization.
  • Examined the effects of cellular stress and HDAC inhibitors on TDP43 aggregation using fluorescence microscopy.
  • Performed biochemical analyses including SDS-PAGE, Western blotting, and immunocytochemistry to characterize TDP43 aggregates.

Main Results:

  • Cellular stress induced distinct TDP43 aggregation patterns in the nucleus and cytoplasm.
  • HDAC inhibition caused time-dependent TDP43 mislocalization from the nucleus to the cytoplasm, linked to increased cellular acetylation.
  • HDAC inhibition promoted stable, SDS-resistant TDP43 oligomers via disulfide-linked aggregation, with disulfide bonding being the primary driver over phosphorylation.

Conclusions:

  • Acetylation-mediated disulfide-linked aggregation is critical in TDP43 pathology.
  • HDAC inhibition contributes to TDP43 mislocalization and the formation of stable oligomers.
  • Targeting the HDAC/acetylation pathway offers a potential therapeutic strategy for TDP43 proteinopathies like ALS and FTLD.