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• W2008676708 abstract "Inflammatory conditions characterized by neutrophil activation are associated with a variety of chronic diseases. Reactive oxygen species are produced by activated neutrophils and produce DNA damage which may lead to tissue damage. Previous studies have shown that activated murine neutrophils induce DNA strand breaks in a target plasmacytoma cell, RIMPC 2394. We studied the effect of a water soluble nitroxide anti-oxidant, Tempol, on murine neutrophil induction of DNA strand breaks in this system. Murine neutrophils were isolated from the peritoneal cavity of BALB/cAn mice after an IP injection of pristane oil. Neutrophils were activated by the phorbol esther PMA and co-incubated with RIMPC 2394 cells. Control alkaline elution studies revealed progressive DNA strand breaks in RIMPC cells with time. The addition of Tempol to the incubation mixture prevented DNA damage in a dose dependent fashion. Five mM Tempol provided complete protection. Tempol protection against DNA strand breaks was similar for both stimulated neutrophils and exogenously added hydrogen peroxide. Measurement of hydrogen peroxide produced by stimulated neutrophils demonstrated that Tempol did not decrease hydrogen peroxide concentration. Oxidation of reduced metals, thereby interfering with the production of hydroxyl radical, is the most likely mechanism of nitroxide protection, although superoxide dismutase (SOD)-like activity and scavenging of carbon-based free radicals may also account for a portion of the observed protection. The anti-oxidant activity of Tempol inhibited DNA damage by activated neutrophils. The nitroxides as a class of compounds may have a role in the investigation and modification of inflammatory conditions." @default.
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• W2008676708 date "1997-01-01" @default.
• W2008676708 modified "2023-09-27" @default.
• W2008676708 title "Tempol Inhibits Neutrophil and Hydrogen Peroxide-Mediated DNA Damage" @default.
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• W2008676708 doi "https://doi.org/10.1016/s0891-5849(97)00079-8" @default.
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