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ER81 and CaMKIV identify anatomically and phenotypically defined subsets of mouse olfactory bulb interneurons
Author(s) -
SainoSaito Sachiko,
Cave John W.,
Akiba Yosuke,
Sasaki Hayato,
Goto Kaoru,
Kobayashi Kazuto,
Berlin Roseann,
Baker Harriet
Publication year - 2007
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.21293
Subject(s) - biology , olfactory bulb , tyrosine hydroxylase , neuroscience , phenotype , transcription factor , microbiology and biotechnology , dopamine , gene , genetics , central nervous system
The mechanisms underlying dopamine (DA) phenotypic differentiation in the olfactory bulb (OB) have not yet been fully elucidated and are the subject of some controversy. OB DA interneurons destined for the glomerular layer were shown to originate in the subventricular zone (SVZ) and in the rostral migratory stream (RMS). The current study investigated whether calcium/calmodulin‐dependent protein kinase IV (CaMKIV) either alone or together with the Ets transcription factor ER81 was necessary for phenotypic determination during migration of progenitors. In most brain areas, including the OB, CaMKIV and ER81 displayed a reciprocal distribution. In the SVZ, only ER81 could be demonstrated. In the RMS, a subpopulation of progenitors contained ER81, but few, if any, contained CaMKIV. In OB, CaMKIV expression, restricted to deep granule cells, showed limited overlap with ER81. ER81 expression was weak in deep granule cells. Strong labeling occurred in the mitral and glomerular layers, where ER81 colabeled dopaminergic periglomerular cells that expressed either tyrosine hydroxylase (TH) or green fluorescent protein, the latter reporter gene under control of 9‐kb of 5′ TH promoter. Odor deprivation resulted in a significant 5.2‐fold decline in TH immunoreactivity, but ER81 exhibited a relatively small 1.7‐fold decline in immunoreactivity. TH expression as well as brain and bulb size were unchanged in CaMKIV knockout mice. These data suggest that ER81 may be required but is not sufficient for DA neuron differentiation and that CaMKIV is not directly involved in TH gene regulation. J. Comp. Neurol. 502:485–496, 2007. © 2007 Wiley‐Liss, Inc.