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273413 occurrences (No.92 in the rank) during 5 years in the PubMed. [no cache] 500 found
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273413 occurrences (No.92 in the rank) during 5 years in the PubMed. [no cache] 500 found
| 354) When photoirradiation was conducted in the presence of a lipid (methyl linoleate), BaP metabolites, BPDE, and three related PAHs, pyrene, 7,8,9,10-tetrahydro-BaP trans-7,8-diol, and 7,8,9,10-tetrahydro-BaP trans-9,10-diol, all induced lipid peroxidation. |
| PMID:23552265 DOI:10.1177/0748233713484648 |
| 2015 Toxicology and industrial health |
| * UVA photoirradiation of benzo[a]pyrene metabolites: induction of cytotoxicity, reactive oxygen species, and lipid peroxidation. |
| - Benzo[a]pyrene (BaP) is a prototype for studying carcinogenesis of polycyclic aromatic hydrocarbons (PAHs). We have long been interested in studying the phototoxicity of PAHs. In this study, we determined that metabolism of BaP by human skin HaCaT keratinocytes resulted in six identified phase I metabolites, for example, BaP trans-7,8-dihydrodiol (BaP t-7,8-diol), BaP t-4,5-diol, BaP t-9,10-diol, 3-hydroxybenzo[a]pyrene (3-OH-BaP), BaP (7,10/8,9)tetrol, and BaP (7/8,9,10)tetrol. The photocytotoxicity of BaP, 3-OH-BaP, BaP t-7,8-diol, BaP trans-7,8-diol-anti-9,10-epoxide (BPDE), and BaP (7,10/8,9)tetrol in the HaCaT keratinocytes was examined. When irradiated with 1.0 J/cm(2) UVA light, these compounds when tested at doses of 0.1, 0.2, and 0.5 μM, all induced photocytotoxicity in a dose-dependent manner. When photoirradiation was conducted in the presence of a lipid (methyl linoleate), BaP metabolites, BPDE, and three related PAHs, pyrene, 7,8,9,10-tetrahydro-BaP trans-7,8-diol, and 7,8,9,10-tetrahydro-BaP trans-9,10-diol, all induced lipid peroxidation. The formation of lipid peroxides by BaP t-7,8-diol was inhibited by NaN3 and enhanced by deuterated methanol, which suggests that singlet oxygen may be involved in the generation of lipid peroxides. The formation of lipid hydroperoxides was partially inhibited by superoxide dismutase (SOD). Electron spin resonance spin trapping experiments indicated that both singlet oxygen and superoxide radical anion were generated from UVA photoirradiation of BPDE in a light dose responding manner. |
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