Regular ArticleHydrogen Peroxide Suppresses U937 Cell Death by Two Different Mechanisms Depending on Its Concentration
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2008, Brain ResearchCitation Excerpt :Most cells have enzymatic cellular defense against H2O2 including catalase and glutathione peroxidase (Simonian and Coyle 1996). When the cells are challenged with small doses of H2O2, the defenses are upregulated, and with the result, cells are more resilient to subsequent exposure to cytotoxic doses (Valen et al. 1998; Lee and Um 1999; Tang et al. 2006; Sharma and Netland 2007). However, under the conditions of stress, the antioxidant cellular defense system becomes depleted (Conklin 2000).
HSF1 down-regulates XAF1 through transcriptional regulation
2006, Journal of Biological ChemistryCitation Excerpt :Anti-oxidants Overcome the Suppression of XAF1 Expression—ROS has been implicated as an etiologic factor in numerous diseases, including cancer. ROS can originate exogenously from agents that generate oxygen free radicals and originate endogenously, for example, as a result of normal cellular metabolism, such as mitochondrial oxidative phosphorylation (25–27). It has been reported that H2O2 could stimulate binding of HSF1 to the HSE (28–30).
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