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• W2553945311 endingPage "118" @default.
• W2553945311 startingPage "110" @default.
• W2553945311 abstract "Resin monomers such as 2-hydroxyethyl methacrylate (HEMA) induce apoptosis because of the excess formation of reactive oxygen species (ROS). The portion of ROS including superoxide anions, hydrogen peroxide or hydroxyl radicals in monomer-induced apoptosis is unknown. Here, the effectiveness of superoxide anions or hydroxyl radicals was analyzed using tempol or sodium formate as radical scavengers. RAW264.7 mouse macrophages were exposed to HEMA (0–6–8 mM) in the presence of tempol (0–0.05–0.5–5.0 mM) or sodium formate (0–1–5–10 mM). The formation of ROS using DCFH2-DA or dihydrorhodamine 123 (DHR123) as fluorescent dyes and the induction of apoptosis was determined by flow cytometry after 1 h or 24 h exposure periods. Expression of enzymes related to ROS metabolism was detected by Western blotting. DCF fluorescence significantly increased after short exposure (1 h) while DHR123 fluorescence was enhanced after a long exposure period (24 h) in cells treated with HEMA. Although no influence was detected on the formation of ROS, tempol or sodium formate protected cells from HEMA-induced apoptosis. The number of cells in late apoptosis or necrosis induced with 6 or 8 mM HEMA was reduced in the presence of tempol or low concentrations of sodium formate. HEMA-induced expression of catalase, indicating oxidative stress, decreased in the presence of tempol. Superoxide anions and hydroxyl radicals contribute to HEMA-induced apoptosis. The current findings support the development of strategies based on the pharmacological inhibition of enzymes producing superoxide anions finally converted to hydroxyl radicals to compensate for potential adverse tissue reactions associated with dental composites." @default.
• W2553945311 created "2016-11-30" @default.
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• W2553945311 date "2017-01-01" @default.
• W2553945311 modified "2023-10-17" @default.
• W2553945311 title "Critical role of superoxide anions and hydroxyl radicals in HEMA-induced apoptosis" @default.
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• W2553945311 doi "https://doi.org/10.1016/j.dental.2016.11.003" @default.
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