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pubmed-article:17020887pubmed:abstractTextIncreased expression of heme oxygenase-1 (HO-1) increases NO resistance in several cell types, although the biochemical mechanism for this protection is unknown. To address this issue, we have measured different molecular markers of nitrosative stress in three stably transfected cell lines derived from the human lung epithelial line A549: two lines that overexpress rat HO-1 (L1 and A4), and a control line with the empty vector (Neo). Compared with the control Neo cells, L1 and A4 cells had, respectively, 5.8- and 3.8-fold greater HO activity accompanied by increased resistance to NO-induced necrosis. Compared with the Neo control, the HO-1-overexpressing cells also showed significantly less lipid peroxide formation and decreased perturbation of transition metal oxidation and coordination states following a cytotoxic NO exposure. These effects were blocked by the HO-1 inhibitors Zn- and Sn-protoporphyrin IX. In contrast, HO-1 overexpression did not significantly affect total reactive oxygen or nitrogen species, the levels of the nucleobase deamination products in DNA (xanthine, inosine, and uracil) following NO exposure, or NO-induced protein nitration. While increased HO-1 activity prevented NO-induced fluctuations in transition metal homeostasis, addition of an iron chelator decreased NO toxicity only slightly. Our results indicate that lipid peroxidation is a significant cause of NO-induced necrosis in human lung epithelial cells, and that the increased NO survival of L1 cells is due at least in part to decreased lipid peroxidation mediated by HO-1-generated biliverdin or bilirubin.lld:pubmed
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pubmed-article:17020887pubmed:articleTitleResistance to nitric oxide-induced necrosis in heme oxygenase-1 overexpressing pulmonary epithelial cells associated with decreased lipid peroxidation.lld:pubmed
pubmed-article:17020887pubmed:affiliationDepartment of Genetics and Complex Diseases, Harvard School of Public Health, Boston, Massachusetts 02115, USA.lld:pubmed
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