title: Formation of 8-hydroxydeoxyguanosine, hydroxyl free radical adduct of DNA in granulocytes exposed to the tumor promoter, tetradecanoylphorbolacetate.
abstract: The exposure of human granulocytes to the tumor promoter, tetradecanoylphorbolacetate (TPA), resulted in the accumulation of 8-hydroxydeoxyguanosine (8-OHdG) in the DNA of the treated cells. Hydroxyl free radicals react with DNA causing the hydroxylation of guanine at the C-8 position. The modified nucleoside (8-OHdG) cleaved from DNA, was quantitated at subpicomole levels utilizing high pressure liquid chromatography with electrochemical detection (LCED). Superoxide dismutase and catalase caused a marked decrease in the levels of 8-OHdG in the cellular DNA. The level of 8-OHdG formed by TPA stimulation of granulocytes was equivalent to one modified guanine for about every 600 possible guanines in the cellular DNA.
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000378:metabolism*; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000096:biosynthesis; D004563:Electrochemistry; D005609:Free Radicals; D006098:Granulocytes / Q000378:metabolism*; D006801:Humans; D006900:Hydroxylation; D066298:In Vitro Techniques; D010704:Phorbols / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D005609:Free Radicals; D010704:Phorbols; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D003849:Deoxyguanosine; D013755:Tetradecanoylphorbol Acetate