title: Expression of PTPRO in the interneurons of adult mouse olfactory bulb.
abstract: PTPRO is a receptor-type protein tyrosine phosphatase (PTP) with a single catalytic domain in its cytoplasmic region and multiple fibronectin type III-like domains in its extracellular region. In the chick, PTPRO mRNA has been shown to be particularly abundant in embryonic brain, and PTPRO is implicated in axon growth and guidance during embryonic development. However, the temporal and spatial expression of PTPRO protein in the mammalian CNS, particularly in the juvenile and adult mammalian brain, has not been evaluated in any detail. By immunohistofluorescence analysis with a monoclonal antibody to PTPRO, we show that PTPRO is widely expressed throughout the mouse brain from embryonic day 16 to postnatal day 1, while expression is largely confined to the olfactory bulb (OB) and olfactory tubercle in the adult brain. In the OB, PTPRO protein is expressed predominantly in the external plexiform layer, the granule cell layer, and the glomerular layer (GL). In these regions, expression of PTPRO is predominant in interneurons such as gamma-aminobutyric acid (GABA)-ergic or calretinin (CR)-positive granule cells. In addition, PTPRO is expressed in GABAergic, CR-positive, tyrosine hydroxylase-positive, or neurocalcin-positive periglomerular cells in the GL. Costaining of PTPRO with other neuronal markers suggests that PTPRO is likely to be localized to the dendrites or dendritic spines of these olfactory interneurons. Thus, PTPRO might participate in regulation of dendritic morphology or synapse formation of interneurons in the adult mouse OB.
authors.affiliation: Laboratory of Biosignal Sciences, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma 371-8512, Japan.
authors.forename: Takenori
authors.initials: T
authors.lastname: Kotani
authors.forename: Yoji
authors.initials: Y
authors.lastname: Murata
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohnishi
authors.forename: Munemasa
authors.initials: M
authors.lastname: Mori
authors.forename: Shinya
authors.initials: S
authors.lastname: Kusakari
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Saito
authors.forename: Hideki
authors.initials: H
authors.lastname: Okazawa
authors.forename: John L
authors.initials: JL
authors.lastname: Bixby
authors.forename: Takashi
authors.initials: T
authors.lastname: Matozaki
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry; D015415:Biomarkers; D002478:Cells, Cultured; D005260:Female; D005455:Fluorescent Antibody Technique; D007202:Indicators and Reagents; D007395:Interneurons / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009830:Olfactory Bulb / Q000166:cytology / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics; D011247:Pregnancy; D036122:Receptor, EphA4 / Q000378:metabolism; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3 / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification; D014162:Transfection; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D015415:Biomarkers; D007202:Indicators and Reagents; D005680:gamma-Aminobutyric Acid; D036122:Receptor, EphA4; C516890:Ptpro protein, mouse; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3