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TROY, a Novel Member of the Tumor Necrosis Factor Receptor Superfamily in the Central Nervous System
Author(s) -
MORIKAWA YOSHIHIRO,
HISAOKA TOMOKO,
KITAMURA TOSHIO,
SENBA EMIKO
Publication year - 2006
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1366.036
Subject(s) - olfactory bulb , biology , subventricular zone , olfactory nerve , olfactory ensheathing glia , glial fibrillary acidic protein , in situ hybridization , olfactory epithelium , microbiology and biotechnology , central nervous system , olfactory marker protein , neuroepithelial cell , olfactory system , neural stem cell , messenger rna , neuroscience , immunology , stem cell , immunohistochemistry , genetics , gene
: Using a signal sequence trap method, we isolated TROY, a novel member of the tumor necrosis factor receptor superfamily (TNFRSF), from a mouse brain cDNA library. TROY mRNA is strongly expressed in brain and embryo. In situ hybridization analysis of the embryo showed that TROY mRNA was exclusively expressed in the epithelium of many tissues, including neuroepithelium. In the developing central nervous system, TROY mRNA was strongly expressed in the ventricular and subventricular zones, which contain neuronal and glial precursors during mouse embryogenesis that are both region‐specific and stage‐dependent. In addition, TROY mRNA was expressed in the developing olfactory bulb from embryonic day (E) 13.5 to neonate. Next, we focused on the detailed cellular characterization of TROY‐expressing cells in the developing olfactory system. TROY mRNA was first detected in the olfactory nerve layer (ONL) of the olfactory bulb at E13.5 and was expressed most intensely in the inner ONL (ONL‐i) during late embryogenesis. In the postnatal olfactory bulb, TROY‐expressing cells were also detected in the glomerular layer (GL) and ONL‐i. TROY was intensely expressed in olfactory ensheathing cells (OECs) of the ONL‐i, which are positive for neuropeptide Y (NPY), but negative for S‐100 or p75 low‐affinity nerve growth factor receptor. Furthermore, TROY was also detected in glial fibrillary acidic protein (GFAP)‐positive glial cells of the ONL‐i and GL. Thus, TROY was expressed in some specific subsets of glial cells in the olfactory bulb, including OECs, and may play some roles in the developing and adult olfactory system.