Noise-induced plasticity of KCNQ2/3 and HCN channels underlies vulnerability and resilience to tinnitus
Noise-induced plasticity of KCNQ2/3 and HCN channels underlies vulnerability and resilience to tinnitus
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.
- University of Pittsburgh United States
QH301-705.5, Science, Q, R, Nerve Tissue Proteins, hyperexcitability-related disorders, homeostatic plasticity, KCNQ3 Potassium Channel, HCN channels, Mice, Tinnitus, Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels, Medicine, Animals, KCNQ2 Potassium Channel, tinnitus, Biology (General), Noise, potassium channel, Neuroscience
QH301-705.5, Science, Q, R, Nerve Tissue Proteins, hyperexcitability-related disorders, homeostatic plasticity, KCNQ3 Potassium Channel, HCN channels, Mice, Tinnitus, Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels, Medicine, Animals, KCNQ2 Potassium Channel, tinnitus, Biology (General), Noise, potassium channel, Neuroscience
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