title: Changes in glutamate receptor subunit 4 expression in the deafferented olfactory bulb of zebrafish.
abstract: The distribution of ionotropic glutamate receptor subunit 4 (iGluR4) was examined in both normal and deafferented olfactory bulbs of adult zebrafish, Danio rerio. With the exception of the olfactory nerve layer, there was extensive labeling with antibodies to iGluR4 in the olfactory bulbs, specifically in juxtaglomerular cell bodies and their processes. These results are consistent with previous work, which has suggested differential distribution of glutamate receptors in the vertebrate olfactory system. Analysis of bulbs following olfactory organ removal revealed a significant loss of iGluR4 immunoreactivity by 24 h post-deafferentation. At 48 h after denervation, iGluR4 labeling had returned to normal levels and was retained through 3 weeks post-surgery. Thus, afferent input plays a role in reduced labeling of this protein immediately following injury, but return of immunoreactivity can occur even without sensory innervation.
authors.affiliation: Department of Biological Sciences, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, MI 49008-5410, USA.
authors.forename: Cynthia L
authors.initials: CL
authors.lastname: Fuller
authors.forename: Ruth
authors.initials: R
authors.lastname: Villanueva
authors.forename: Christine A
authors.initials: CA
authors.lastname: Byrd
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002452:Cell Count; D003714:Denervation / Q000009:adverse effects; D005260:Female; D005786:Gene Expression Regulation / Q000502:physiology*; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D009474:Neurons / Q000378:metabolism*; D009830:Olfactory Bulb / Q000166:cytology* / Q000502:physiology; D018091:Receptors, AMPA / Q000378:metabolism*; D013997:Time Factors; D014446:Tyrosine 3-Monooxygenase / Q000378:metabolism; D015027:Zebrafish
chemical_list: D018091:Receptors, AMPA; C104724:glutamate receptor ionotropic, AMPA 4; D014446:Tyrosine 3-Monooxygenase