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Area of Science:

  • Epigenetics and molecular medicine
  • Genetics and genomics of rare diseases

Background:

  • Protein-misfolding diseases present therapeutic challenges due to genetic diversity and variable patient responses.
  • Histone deacetylase inhibitors (HDACi) show potential in correcting diseases caused by familial and somatic mutations.
  • Cystic fibrosis (CF), caused by CF transmembrane conductance regulator (CFTR) gene mutations, has over 2000 variants, with HDACi efficacy debated.

Purpose of the Study:

  • To investigate the impact of FDA-approved HDAC inhibitors on the trafficking and function of various CFTR variants.
  • To assess the potential of HDAC inhibitors as a therapeutic strategy for CF-causing mutations.

Main Methods:

  • Examined the effects of panobinostat (LBH-589) and romidepsin (FK-228) on a panel of CFTR variants.
  • Assessed functional correction by measuring cell surface chloride channel activity in primary human bronchial epithelial cells.
  • Investigated synergistic effects of HDAC inhibitors in combination with Vx809.

Main Results:

  • Panobinostat and romidepsin demonstrated functional correction for Class II and III CFTR variants, restoring chloride channel activity.
  • These HDAC inhibitors synergized with Vx809, significantly enhancing channel activity for multiple CFTR variants.
  • The findings suggest HDAC inhibitors can help normalize cellular function affected by CF-causing mutations.

Conclusions:

  • FDA-approved HDAC inhibitors, panobinostat and romidepsin, can functionally correct specific CFTR variants.
  • A combination therapy of HDAC inhibitors with Vx809 shows significant potential for treating a broader range of CFTR mutations.
  • HDAC inhibitors may offer a 'leveling' effect for correcting CF-causing mutations, potentially applicable to other protein-misfolding diseases.