The authors have no financial disclosures for this article.
Version of Record online: 6 JUN 2011
Copyright © 2011 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 121, Issue 7, pages 1541–1547, July 2011
How to Cite
Zhou, C. Q., Lee, J., Henkemeyer, M. J. and Lee, K. H. (2011), Disruption of ephrin B/Eph B interaction results in abnormal cochlear innervation patterns. The Laryngoscope, 121: 1541–1547. doi: 10.1002/lary.21861
The authors have no conflicts of interest to declare.
- Issue online: 16 JUN 2011
- Version of Record online: 6 JUN 2011
- Manuscript Accepted: 29 MAR 2011
- Manuscript Received: 20 JAN 2011
- Cochlear implants;
- cochlear innervation;
- axon guidance;
- ephrins and Ephs
To determine the expression patterns of B ephrins and Ephs in the cochlea and identify functional consequences of disruption of ephrin B/Eph B interactions in both cultured spiral ganglion neurons and in the cochlea of live animals.
The expression patterns of various B ephrins and Ephs were determined in mice with Lac-Z mutation. Mice with null function of individual B ephrin and Eph proteins and those with multiple knockouts were studied for cochlear innervation patterns.
Mice with B ephrins and Ephs disrupted with the β-galactosidase gene were sacrificed at P6, and their cochleae isolated and processed for Lac-Z staining to determine expression of these proteins in cochlear tissue. Spiral ganglion cells from wild-type as well as ephrin B1 knockout mice were isolated and cocultured with Eph B2 expressing Cos1 cells and neurite lengths were determined. Fluorescent lipophillic dyes were used to label spiral ganglion cell nerve fibers to determine cochlear innervation patterns in wild-type and knockout mice.
Eph B1, B2, and ephrin B2 but not B3 was expressed in the cochlea. Eph B2 inhibited outgrowth of spiral ganglion cell axons from wild-type mice, but not from ephrin B1 knockout mice in culture. Knockout mice with null function of ephrin B1 alone or Eph B1, Eph B2, Eph B3 in combination demonstrated abnormal innervation patterns in the organ of Corti.
Disruption of B ephrins and Ephs results in functional consequences in spiral ganglion cells, suggesting that these proteins play a role in establishing normal innervation patterns in the cochlea.