title: Hydrogen peroxide induces adaptive response and differential gene expression in human embryo lung fibroblast cells.
abstract: Hydrogen peroxide (H2 O2 ), a substance involved in cellular oxidative stress, has been observed to induce an adaptive response, which is characterized by a protection against the toxic effect of H2 O2 at higher concentrations. However, the molecular mechanism for the adaptive response remains unclear. In particular, the existing reports on H2 O2 -induced adaptive response are limited to animal cells and human tumor cells, and relatively normal human cells have never been observed for an adaptive response to H2 O2 . In this study, a human embryo lung fibroblast (MRC-5) cell line was used to model an adaptive response to H2 O2 , and the relevant differential gene expressions by using fluoro mRNA differential display RT-PCR. The results showed significant suppression of cytotoxicity of H2 O2 (1100 μM, 1 h) after pretreatment of the cells with H2 O2 at lower concentrations (0.088-8.8 μM, 24 h), as indicated by cell survival, lactate dehydrogenase release, and the rate of apoptotic cells. Totally 60 mRNA components were differentially expressed compared to untreated cells, and five of them (sizing 400-600 bp) which demonstrated the greatest increase in expression were cloned and sequenced. They showed identity with known genes, such as BCL-2, eIF3S5, NDUFS4, and RPS10. Real time RT-PCR analysis of the five genes displayed a pattern of differential expression consistent with that by the last method. These five genes may be involved in the induction of adaptive response by H2 O2 in human cells, at least in this particular cell type.
authors.affiliation: Department of Toxicology, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou 510515, People's Republic of China; Department of Toxicology, Faculty of Preventive Medicine, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, People's Republic of China; Toxicology Laboratory, Shenzhen Center for Disease Control and Prevention, Shenzhen, 21 TianBei 1st Road, Shenzhen 518020, Guangdong Province, People's Republic of China.
authors.forename: Qinzhi
authors.initials: Q
authors.lastname: Wei
authors.forename: Haiyan
authors.initials: H
authors.lastname: Huang
authors.forename: Linqing
authors.initials: L
authors.lastname: Yang
authors.forename: Jianhui
authors.initials: J
authors.lastname: Yuan
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Yang
authors.forename: Yungang
authors.initials: Y
authors.lastname: Liu
authors.forename: Zhixiong
authors.initials: Z
authors.lastname: Zhuang
mesh_terms: D002460:Cell Line; D002470:Cell Survival; D004622:Embryo, Mammalian / Q000166:cytology*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D015870:Gene Expression; D020869:Gene Expression Profiling; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism* / Q000633:toxicity; D008168:Lung / Q000166:cytology* / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D012333:RNA, Messenger; D006861:Hydrogen Peroxide