Abstract
Nestin promoter-GFP (green fluorescent protein) transgenic mice were used to determine the presence of stem/progenitor cells in the mouse inner ear. We examined the inner ear of mice at the following postnatal days (P): P0, P4, P5, P15 and P60. Hair cells stereocilia were identified with the use of the histochemical marker phalloidin. Whole endorgans or cryosections were analyzed under epi-fluorescent or confocal microscopy. From P0 to P5, GFP expressing cells were found in the vestibular sensory epithelia of the macula utricle, but not in the crista ampullaris. Cells within the stroma (tissue underneath the sensory epithelia), utricle, and crista were also GFP-positive. Satellite cells in the vestibular ganglia were GFP-positive, while vestibular ganglia neurons were not. In the organ of Corti, GFP signal was found in inner border and inner phalangeal cells that surround the inner hair cells (GFP-negative), Dieters cells and cells in the great epithelial ridge. Outer hair cells were mildly positive for GFP. Satellite cells in the spiral ganglia were GFP-positive, while spiral ganglia neurons were not. Similar GFP expression was found in the vestibule and cochlea of animals at P15, however, outer hair cells showed no GFP expres...Continue Reading
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