Publication date: Available online 9 February 2017
Source:European Annals of Otorhinolaryngology, Head and Neck Diseases
Author(s): M. Risoud, J. Sircoglou, G. Dedieu, M. Tardivel, C. Vincent, N.-X. Bonne
ObjectivesTo draw up a clearing protocol for Mongolian gerbil cochlea, and to assess the feasibility of quantifying and analyzing 3D cell architecture in the transparent cochleae.Materials and methodsFreshly dissected inner ears were prepared on a 13-day protocol: fixation, microdissection, post-fixation, decalcification, pretreatment (signal enhancement, permeabilization and blocking), fluorescent labeling (indirect immunolabeling and direct labeling), dehydration, clearing in Spalteholz solution (MSBB: methyl salicylate and benzyl benzoate) and mounting. Image acquisition used laser scanning confocal microscopy. ImageJ software was used to measure the length of the organ of Corti thus available for analysis and to count inner and outer hair cells.ResultsFour cochleas underwent imaging. 3D reconstruction enabled organ of Corti length to be measured, at a mean 1269±346μm. Mean inner and outer hair-cell count per organ of Corti length was 142±44 and 400±122, respectively.ConclusionCochlear clearing by MSBB was feasible in Mongolian gerbils and provided high-resolution immunofluorescence-labeled inner-ear images. To our knowledge, this was the first application of the technique in this species. Cell count could thus be performed along the organ of Corti length without traumatic dissection.
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