Qx28 treatment in neuromast hair cells. Representative images of 5 dpf Tg(brn3c:GFP) zebrafish pretreated with Qx28 (1 nM?300 ?M) followed by coincubation with the different ototoxins. (A?F) Short-term effect (STE) of gentamicin 100 ?M for 1 hour followed by 1-hour recovery in E3 water. (G?L) Long-term effect (LTE) of gentamicin 100 ?M for 1 hour followed by 5-hour recovery in E3 water. (M?R) Neomycin 200 ?M for 30 minutes followed by 1-hour recovery in E3 water. (S?X) CDDP 400 ?M for 6 hours followed by 1-hour recovery. (Y) Vehicle control neuromast. GFP shown in green, otoferlin shown in red. Neuromasts were imaged employing a Zeiss LSM 800 confocal microscope with a 63× oil objective and Airyscan function. Scale bars: 7 ?m (A?X), 5 ?m (Y). (Z) Chemical structure of Qx, Qx28, and Qx66. For sample numbers see legend of Figure 3.
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