title: [Influence of reactive oxygen species on mouse bone marrow hematopoietic stem cell apoptosis].
abstract: Objective of this study was to investigate the mechanism of the biological function damage resulting from increased ROS in peripheral blood stem cells during peripheral blood stem cell transplantation. Bone marrow hematopoietic stem cells (BMHSC) were cultured at the oxygen concentration imitated according to the bone marrow oxygen concentration (5% O2) including mean venous oxygen concentration (12% O2), mean arterial oxygen concentration (20% O2). The ROS level in BMHSC was detected by using fluorescent probe, the percentage of BM-HSC in cell cycle was determined by flow cytometry, the apoptosis rate was assayed by Annexin V/PI double staining, the expression levels of ATM gene and P21 protein were measured by PCR and Western respectively. The results showed that as compared with control group (5% O2), the ROS levels were lower, the percentage of cells in G1, S,G2/M phase increased (P < 0.01), the apoptosis rate of cells obviously increased (P < 0.01), the expression level of ATM gene obviously decreased (P < 0.01), while the expression level of P21 protein significantly was enhanced (P < 0.01) in 12% O2, 20% O2 and 5%-12%-20% O2 groups. It is concluded that ROS results in the apoptosis of BMHSC through inhibiting the expression of ATM gene and activating P21 protein.
authors.affiliation: Department of Blood Transfusion, The First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China. E-mail hyw82666@163.com.
authors.forename: Yi-Wen
authors.initials: YW
authors.lastname: Hao
authors.forename: Huan-Ming
authors.initials: HM
authors.lastname: Xu
authors.forename: Da-Ye
authors.initials: DY
authors.lastname: Cheng
authors.forename: Yi-Ran
authors.initials: YR
authors.lastname: Ma
mesh_terms: D000818:Animals; D017209:Apoptosis; D064007:Ataxia Telangiectasia Mutated Proteins / Q000378:metabolism; D001854:Bone Marrow Cells / Q000166:cytology*; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D051379:Mice; D008810:Mice, Inbred C57BL; D017382:Reactive Oxygen Species / Q000378:metabolism*
chemical_list: C493957:Cdkn1a protein, mouse; D050759:Cyclin-Dependent Kinase Inhibitor p21; D017382:Reactive Oxygen Species; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse