title: Involvement of Cold Inducible RNA-Binding Protein in Severe Hypoxia-Induced Growth Arrest of Neural Stem Cells In Vitro.
abstract: Neonatal hypoxia is the leading cause of brain damage with birth complications. Many studies have reported proliferation-promoting effect of mild hypoxia on neural stem cells (NSCs). However, how severe hypoxia influences the behavior of NSCs has been poorly explored. In the present study, we investigated the effects of 5, 3, and 1 % oxygen exposure on NSCs in vitro. MTT, neurosphere assay, and 5-ethynyl-2'-deoxyuridine (EdU) incorporation revealed a quick growth arrest of C17.2 cells and primary NSCs induced by 1 % oxygen exposure. Cell cycle analysis showed that this hypoxia exposure caused a significant increase of cells in G0/G1 phase and decrease of cells in S phase that is associated with decrease of Cyclin D1. Interestingly, the expression of cold inducible RNA-binding protein (CIRBP), a cold responsive gene reacting to multiple cellular stresses, was decreased in parallel with the 1 % oxygen-induced proliferation inhibition. Forced expression of CIRBP under hypoxia could restore the proliferation of NSCs, as showed by EdU incorporation and cell cycle analysis. Furthermore, the expression of Cyclin D1 under hypoxia was also restored by CIRBP overexpression. Taken together, these data suggested a growth-suppressing effect of severe hypoxia on NSCs and, for the first time, revealed a novel role of CIRBP in hypoxia-induced cell cycle arrest, suggesting that modulating CIRBP may be utilized for preventing hypoxia-induced neonatal brain injury.
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Ya-Zhou
authors.initials: YZ
authors.lastname: Wang
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Jiye
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China.
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Occupational and Environmental Health, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, 169 Chang Le Xi Road, Xi'an, Shaanxi, 710032, China. luowenj@fmmu.edu.cn.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Luo
mesh_terms: D000818:Animals; D017209:Apoptosis; D059447:Cell Cycle Checkpoints; D015687:Cell Hypoxia; D049109:Cell Proliferation; D002478:Cells, Cultured; D051379:Mice; D058953:Neural Stem Cells / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010766:Phosphorylation; D016601:RNA-Binding Proteins / Q000378:metabolism*
chemical_list: D016601:RNA-Binding Proteins; D010100:Oxygen
keywords: CIRBP; Neural stem cells; Proliferation; Severe hypoxia