Authors: Dengke Li Jianhe Sun Lidong Zhao Weiwei Guo Wei Sun Shiming Yang
Publish Date: 2016/12/22
Volume: 31, Issue: 3, Pages: 348-357
Abstract
The spiral ganglion neurons SGNs located in the Rosenthal’s canal of cochlea are essential target for cochlear implant Previous studies found that the canaliculi perforantes small pores on the surface of the osseous spiral lamina OSL of the scala tympanic ST of cochlea may provide communication between the cochlear perilymph and SGNs In this study we found that chronic treatment of aminoglycosides antibiotics which is well known to cause sensory cell damage in the cochlea induced significant damage of bone lining cells on the OSLs and increased the permeability of the Rosenthal’s canal The pores among the bone lining cells became significantly wider after chronic treatment of amikacin 100 mg/kg/day for 3–7 days Injection of Evans Blue in the ST resulted in significant increase in its migration in the modulus in the amikacintreated cochlea compared to the control ears suggesting increased permeability of these passages Treatment of amikacin with oxytetracycline an inhibitor of matrix metalloproteases MMPs significantly reduced the amount of dye migrated from the ST to the modiolus These results suggest that amikacin enhanced the permeability between the ST and SGNs by increasing MMPs Aggregating the permeability of the bone lining cells on the OSLs may benefit gene and stem cell delivery to the SGNs in the cochlea
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