Document Detail

Ephrin-B2 reverse signaling is required for topography but not pattern formation of lateral superior olivary inputs to the inferior colliculus.
MedLine Citation:
PMID:  23042409     Owner:  NLM     Status:  MEDLINE    
Graded and modular expressions of Eph-ephrins are known to provide positional information for the formation of topographic maps and patterning in the developing nervous system. Previously we have shown that ephrin-B2 is expressed in a continuous gradient across the tonotopic axis of the central nucleus of the inferior colliculus (CNIC), whereas patterns are discontinuous and modular in the lateral cortex of the IC (LCIC). The present study explores the involvement of ephrin-B2 signaling in the development of projections to the CNIC and LCIC arising from the lateral superior olivary nuclei (LSO) prior to hearing onset. Anterograde and retrograde fluorescent tracing methods in neonatal fixed tissue preparations were used to compare topographic mapping and the establishment of LSO layers/modules in wild-type and ephrin-B2(lacZ/+) mice (severely compromised reverse signaling). At birth, pioneer LSO axons occupy the ipsilateral IC in both groups but are delayed contralaterally in ephrin-B2(lacZ/+) mutants. By the onset of hearing, both wild-type and mutant projections form discernible layers bilaterally in the CNIC and modular arrangements within the ipsilateral LCIC. In contrast, ephrin-B2(lacZ/+) mice lack a reliable topography in LSO-IC projections, suggesting that fully functional ephrin-B2 reverse signaling is required for normal projection mapping. Taken together, these ephrin-B2 findings paired with known coexpression of EphA4 suggest the importance of these signaling proteins in establishing functional auditory circuits prior to experience.
Matthew M Wallace; Sarah M Kavianpour; Mark L Gabriele
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  521     ISSN:  1096-9861     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-03-19     Completed Date:  2013-08-26     Revised Date:  2014-05-14    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1585-97     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
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MeSH Terms
Ephrin-B2 / metabolism*
Inferior Colliculi / cytology,  growth & development*,  metabolism*
Mice, Inbred C57BL
Mice, Mutant Strains
Neurogenesis / physiology*
Olivary Nucleus / cytology,  growth & development*,  metabolism*
Signal Transduction* / physiology
Grant Support
Reg. No./Substance:

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