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tmie Is required for gentamicin uptake by the hair cells of mice.

Comp. Med.2013 Apr;63(2):136-42
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摘要


The circling (cir/cir) mouse is a spontaneous model of deafness due to deletion of a 40-kb genomic region that includes the transmembrane inner ear (tmie) gene. In addition to being deaf, cir/cir mice exhibit abnormal behaviors including circling and hyperactivity. Here we investigated differences between 3-d-old (that is, before hair-cell degeneration) cir/cir and phenotypically normal (+/cir) mice and the reason underlying the degeneration of the inner ear structure of cir/cir mice. To this end, we used gentamicin, gentamicin-Texas red conjugate, and FM1-43 to investigate mechanotransducer channel activity in the hair cells of cir/cir mice; these compounds are presumed to enter hair cells through the mechanotransducer channel. Although the structure of the inner ear of +/cir mice was equivalent to that of cir/cir mice, the hair cells of cir/cir mice (unlike +/cir) did not take up gentamicin, gentamicin-Texas red conjugate, or FM1-43. These findings suggest that hair cells in cir/cir mice demonstrate abnormal maturation and mechanotransduction. In addition, our current results indicate that tmie is required for maturation and maintenance of hair cells.

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