title: Comparison of newly generated doublecortin-immunoreactive neuronal progenitors in the main olfactory bulb among variously aged gerbils.
abstract: In the present study, we investigated age-related differences in neuronal progenitors in the gerbil main olfactory bulb (MOB) using doublecortin (DCX), a marker for neuronal progenitors which differentiate into neurons in the brain. No difference in the number of neuronal nuclei (NeuN)-immunoreactive neurons was found in the MOB at variously aged gerbils. At postnatal month (PM) 1, DCX immunoreaction was detected in all layers of the MOB except for the olfactory nerve layer. At this time point, DCX-immunoreactive cells (neuronal progenitors) were very abundant; however, they did not have fully developed-processes. From PM 3, the number of DCX-immunoreactive neuronal progenitors was decreased with age. At PM 6, DCX-immunoreactive cells showed very well-developed processes. In western blot analysis, DCX protein level in the MOB was highest at PM 1. Thereafter, levels of DCX protein were decreased with age. In the subventricular zone of the lateral ventricle, the number of Ki-67-immunoractive cells (proliferating cells) was also significantly decreased with age. In addition, increases of α-synuclein-immunoreactive structures were observed in the MOB with age. These results suggest that decrease in DCX-immunoreactive neuronal progenitors and its protein levels in the MOB with age may be associated with reduction of cell proliferation in the SVZ and with an increase in α-synuclein in the MOB.
authors.affiliation: Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon, South Korea.
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Choi
authors.forename: Ki-Yeon
authors.initials: KY
authors.lastname: Yoo
authors.forename: Choong Hyun
authors.initials: CH
authors.lastname: Lee
authors.forename: Ok Kyu
authors.initials: OK
authors.lastname: Park
authors.forename: Bing Chun
authors.initials: BC
authors.lastname: Yan
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: In Koo
authors.initials: IK
authors.lastname: Hwang
authors.forename: Jeong Ho
authors.initials: JH
authors.lastname: Park
authors.forename: Sung Koo
authors.initials: SK
authors.lastname: Kim
authors.forename: Moo-Ho
authors.initials: MH
authors.lastname: Won
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D034961:Antigens, Nuclear / Q000378:metabolism; D049109:Cell Proliferation; D000089622:Doublecortin Domain Proteins; D000089662:Doublecortin Protein; D005849:Gerbillinae; D007150:Immunohistochemistry; D008297:Male; D008869:Microtubule-Associated Proteins / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000378:metabolism; D058953:Neural Stem Cells / Q000166:cytology / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D009479:Neuropeptides / Q000378:metabolism*; D009830:Olfactory Bulb / Q000166:cytology / Q000378:metabolism*; D051844:alpha-Synuclein / Q000378:metabolism
chemical_list: D034961:Antigens, Nuclear; C000714848:Dcx protein, rat; D000089622:Doublecortin Domain Proteins; D000089662:Doublecortin Protein; D008869:Microtubule-Associated Proteins; D009419:Nerve Tissue Proteins; D009479:Neuropeptides; C546339:Rbfox3 protein, rat; D051844:alpha-Synuclein