title: Comparison of the immunoreactivities of NMDA receptors between the young and adult hippocampal CA1 region induced by experimentally transient cerebral ischemia.
abstract: Young gerbils are much more resistant to transient cerebral ischemia than the adult. In the present study, we observed that about 90% of CA1 pyramidal cells in the adult hippocampus died 4days post-ischemia; however, about 56% of them in the young hippocampus died at 7days post-ischemia. To compare excitotoxicity between them, we carried out immunoreactivities of NMDA receptor 1 (NMDAR1) and NMDAR2A/B in the hippocampal CA1 region (CA1) induced by 5min of transient cerebral ischemia in the young and adult gerbils. Their immunoreactivities and protein levels in the young sham-group were much lower than those in the adult sham-group. Four days after ischemia-reperfusion, they were significantly decreased in the adult ischemia-group; however, in the young ischemia-group, they were much higher than those in the adult. Seven days after ischemia-reperfusion, NMDAR1 immunoreactivity and its level in the young were much higher than those in the adult; NMDAR2A/B immunoreactivity and its level in the young were lower than in the adult. In brief, the immunoreactivities of NMDARs were not decreased in the ischemic CA1 region of the young 4days after transient cerebral ischemia. This finding indicates that longer maintenance of NMDARs may contribute to less and more delayed neuronal death/damage in the young CA1.
authors.affiliation: Department of Emergency Medicine, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, 200-702 South Korea.
authors.forename: Jeong Yeol
authors.initials: JY
authors.lastname: Seo
authors.forename: Bing Chun
authors.initials: BC
authors.lastname: Yan
authors.forename: Joon Ha
authors.initials: JH
authors.lastname: Park
authors.forename: Ji Hyeon
authors.initials: JH
authors.lastname: Ahn
authors.forename: In Hye
authors.initials: IH
authors.lastname: Kim
authors.forename: Jae-Chul
authors.initials: JC
authors.lastname: Lee
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Kwon
authors.forename: Young-Myeong
authors.initials: YM
authors.lastname: Kim
authors.forename: Jun Hwi
authors.initials: JH
authors.lastname: Cho
authors.forename: Moo-Ho
authors.initials: MH
authors.lastname: Won
mesh_terms: D000375:Aging / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D056547:CA1 Region, Hippocampal / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D005849:Gerbillinae; D002546:Ischemic Attack, Transient / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D008297:Male; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism*
chemical_list: D016194:Receptors, N-Methyl-D-Aspartate; C121001:NR2B NMDA receptor