title: The nucleotide pool is a significant target for oxidative stress.
abstract: Oxidative stress is considered to be one of the most important phenomena involved in the process of aging and age-related diseases. 8-Oxo-7,8-dihydro-2'-deoxyguanosine (8-oxo-dG) has been frequently used as a marker for oxidative stress. However, the origin of extracellular 8-oxo-dG is not well understood. The aim of this work was to investigate the nucleotide pool and the role of the human mutT homologue protein (hMTH1) in the appearance of extracellular 8-oxo-dG in a cellular model system. For this purpose we used primary human fibroblast cells, which were transfected by siRNAs homologous to hMTH1. Extracellular 8-oxo-dG in cell culture media after exposure of the cells to ionizing radiation was measured as enzyme-linked immunosorbent assay reactivity. Our results demonstrate the profound effect of both hMTH1 expression and nucleotide pool size on the cellular excretion of 8-oxo-dG, suggesting that the nucleotide pool is a significant target for the formation of extracellular 8-oxo-dG.
authors.affiliation: Department of Genetics, Microbiology, and Toxicology, Stockholm University, S 10691 Stockholm, Sweden.
authors.forename: Siamak
authors.initials: S
authors.lastname: Haghdoost
authors.forename: Lena
authors.initials: L
authors.lastname: Sjölander
authors.forename: Stefan
authors.initials: S
authors.lastname: Czene
authors.forename: Mats
authors.initials: M
authors.lastname: Harms-Ringdahl
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D015153:Blotting, Western; D002460:Cell Line; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000378:metabolism; D006801:Humans; D009711:Nucleotides / Q000378:metabolism*; D018384:Oxidative Stress; D034741:RNA, Small Interfering
chemical_list: D009711:Nucleotides; D034741:RNA, Small Interfering; D000080242:8-Hydroxy-2'-Deoxyguanosine; D003849:Deoxyguanosine