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• W2117742059 abstract "We previously found hydroperoxide-responsive proteins (HPRPs), which are comprised of peroxiredoxin I (Prx I), Prx II, Prx III, Prx VI, HSP27, G3PDH and two unidentified proteins (HPRP-2' and HPRP-5'), in human umbilical vein endothelial cells. It was demonstrated by two-dimensional polyacrylamide gel electrophoresis (2D PAGE) that most HPRPs are converted into variants with lower pI upon exposure to hydroperoxides. In this study, we examined the HPRP response on 2D gels upon exposure of human endothelial cells (ECV304) to paraquat (PQ2+), which generates reactive oxygen species (ROS) within cells. PQ2+ exerted cytotoxic effects in a dose-(10 microM-10 mM) and time-(24-168 h) dependent manner. Two-dimensional PAGE analysis revealed that HPRP-2', and oxidized forms of Prx I, Prx II and Prx III were clearly increased upon exposure of cells to sublethal levels of PQ2+. Microsequence analysis revealed that both HPRP-2 and -2' were identical with human DJ-1. Moreover immunoblot analysis confirmed the increase of oxidized forms of Prx II, Prx III and DJ-1 in response to sublethal levels of PQ2+. PQ2+ treatment failed to increase fluorescence intensity derived from DCF, which is believed to be an indicator for intracellular levels of hydroperoxide. Although pentachlorophenol (PCP), an uncoupler of the mitochondrial respiratory chain, clearly elevated the fluorescence, PCP had no effect on HPRP response. These observations indicated that DCF-derived fluorescence is not correlated with HPRP response. We consider that the response of Prxs and DJ-1 on 2D gels could reflect endogenous production of ROS in PQ(2+)-treated cells, and might be a sensitive indicator of oxidative stress status." @default.
• W2117742059 created "2016-06-24" @default.
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• W2117742059 date "2001-01-01" @default.
• W2117742059 modified "2023-10-18" @default.
• W2117742059 title "Oxidized forms of peroxiredoxins and DJ-1 on two-dimensional gels increased in response to sublethal levels of paraquat" @default.
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• W2117742059 doi "https://doi.org/10.1080/10715760100300831" @default.
• W2117742059 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11697128" @default.
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