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• W2113142937 endingPage "4379" @default.
• W2113142937 startingPage "4369" @default.
• W2113142937 abstract "Epidemiological research has linked exposure to atmospheric particulate matter (PM) to several adverse health effects, including cardiovascular and pulmonary morbidity and mortality. Despite these links, the mechanisms by which PM causes adverse health effects are poorly understood. The generation of hydroxyl radical (OH) and other reactive oxygen species (ROS) through transition-metal-mediated pathways is one of the main hypotheses for PM toxicity. In order to better understand the ability of particulate transition metals to produce ROS, we have quantified the amounts of OH produced from dissolved iron and copper in a cell-free, surrogate lung fluid (SLF). We also examined how two important biological molecules, citrate and ascorbate, affect the generation of OH by these metals. We have found that Fe(II) and Fe(III) produce little OH in the absence of ascorbate and citrate, but that they efficiently make OH in the presence of ascorbate and this is further enhanced when citrate is also added. In the presence of ascorbate, with or without citrate, the oxidation state of iron makes little difference on the amount of OH formed after 24 h. In the case of Cu(II), the production of OH is greatly enhanced in the presence of ascorbate, but is inhibited by the addition of citrate. The mechanism for this effect is unclear, but appears to involve formation of a citrate–copper complex that is apparently less reactive than free, aquated copper in either the generation of hydrogen peroxide (HOOH) or in the Fenton-like reaction of copper with HOOH to make OH. By quantifying the amount of OH that Fe and Cu can produce in surrogate lung fluid, we have provided a first step into being able to predict the amounts of OH that can be produced in the human lung from exposure to PM containing known amounts of transition metals." @default.
• W2113142937 created "2016-06-24" @default.
• W2113142937 creator A5009015086 @default.
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• W2113142937 date "2008-06-01" @default.
• W2113142937 modified "2023-10-01" @default.
• W2113142937 title "Generation of hydroxyl radicals from dissolved transition metals in surrogate lung fluid solutions" @default.
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• W2113142937 doi "https://doi.org/10.1016/j.atmosenv.2008.01.004" @default.
• W2113142937 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2626252" @default.
• W2113142937 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19148304" @default.
• W2113142937 hasPublicationYear "2008" @default.
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