Transient Delivery of a KCNQ2/3-Specific Channel Activator 1 Week After Noise Trauma Mitigates Noise-Induced Tinnitus.

Summary

Prior work showed that a non-specific KCNQ activator given immediately after noise trauma prevented tinnitus. Here, using RL-81, a highly specific and potent KCNQ2/3 activator, the authors tested whether delaying treatment still worked. Using an operant mouse model in which animals are trained to move to sound but stay still in silence (validated with salicylate, a known tinnitus-inducing drug), transient RL-81 given a full week after noise exposure did not affect hearing loss but significantly reduced the percentage of mice showing behavioral evidence of tinnitus two weeks later.

Key findings

• RL-81, a highly specific KCNQ2/3 activator, was tested starting a week AFTER noise trauma, a clinically realistic delay.
• Delayed treatment still significantly reduced behavioral evidence of tinnitus, without affecting hearing loss itself.
• Validated using an operant conditioning model of tinnitus, confirmed against salicylate-induced tinnitus.
• Suggests a meaningful treatment window exists well after the initial noise injury.