Noise-induced plasticity of KCNQ2/3 and HCN channels underlies vulnerability and resilience to tinnitus

Abstract

Vulnerability to noise-induced tinnitus is associated with increased spontaneous firing rate in dorsal cochlear nucleus principal neurons, fusiform cells. This hyperactivity is caused, at least in part, by decreased Kv7.2/3 (KCNQ2/3) potassium currents. However, the biophysical mechanisms underlying resilience to tinnitus, which is observed in noise-exposed mice that do not develop tinnitus (non-tinnitus mice), remain unknown. Our results show that noise exposure induces, on average, a reduction in KCNQ2/3 channel activity in fusiform cells in noise-exposed mice by 4 days after exposure. Tinnitus is developed in mice that do not compensate for this reduction within the next 3 days. Resilience to tinnitus is developed in mice that show a re-emergence of KCNQ2/3 channel activity and a reduction in HCN channel activity. Our results highlight KCNQ2/3 and HCN channels as potential targets for designing novel therapeutics that may promote resilience to tinnitus.

Document Details

Document Type
Pub Defense Publication
Publication Date
Aug 27, 2015
Source ID
10.7554/elife.07242

Entities

People

  • Bopanna I Kalappa
  • Shuang Li
  • Thanos Tzounopoulos

Organizations

  • National Institute on Deafness and Other Communication Disorders
  • United States Department of Defense
  • University of Pittsburgh

Tags

Fields of Study

  • Biology

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Immunology and Pathology
  • Neuroscience

Technology Areas

  • Biotechnology