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Related Experiment Video

Updated: Jul 23, 2025

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A Chemical Chaperone Restores Connexin 26 Mutant Activity.

Dahua Wang1,2, Hongling Wang1,2, Lu Fan1,2

  • 1Gottfried-Wilhelm-Leibniz University of Hannover, BMWZ (Zentrum für Biomolekulare Wirkstoffe), Schneiderberg 38, 30167 Hannover, Germany.

ACS Pharmacology & Translational Science
|July 20, 2023
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Summary

Researchers identified compounds that restore connexin 26 (Cx26) function, offering potential treatments for hearing disorders caused by Cx26 mutations. A novel screening system identified compounds 3 and 8, with compound 3 showing promising binding affinity.

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Area of Science:

  • Genetics and Molecular Biology
  • Biophysics
  • Pharmacology

Background:

  • Mutations in connexin 26 (Cx26) are a primary cause of hereditary hearing loss.
  • Restoring the function of mutated Cx26 channels is a therapeutic goal for hearing disorders.
  • Existing treatments for hearing loss are limited, necessitating novel therapeutic strategies.

Purpose of the Study:

  • To develop a screening system for identifying compounds that restore connexin 26 (Cx26) function.
  • To discover small molecules capable of rescuing the function of mutated Cx26 channels.
  • To evaluate the efficacy and binding characteristics of identified compounds.

Main Methods:

  • Development of a miniaturized microarray-based screening system for Cx26 functionality assays.
  • Utilized HeLa cells expressing wild-type (WT) and mutant Cx26 for viability and flux assays.
  • Employed thermophoresis to assess compound binding to recombinant Cx26 proteins.

Main Results:

  • Identified compounds 3 (VRT-534) and 8 as capable of restoring mutant Cx26 channel function.
  • Compound 3 demonstrated dose-responsive binding to both WT and mutant Cx26 (K188N).
  • WT Cx26-expressing cells showed sensitivity to HSP90 inhibitor radicicol, aiding in screening.

Conclusions:

  • Novel compounds, particularly VRT-534, show potential for treating Cx26-related hearing disorders.
  • Repurposing existing drugs and utilizing functional bioassays can accelerate the discovery of hearing disorder therapeutics.
  • The developed screening platform offers a robust method for identifying Cx26 modulators.