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- W2465681305 abstract "Previously it was shown that thiol antioxidants are potent inhibitors of the NO-dependent induction of heme oxygenase 1 (HOX-1) gene. However, the mechanism of HOX-1 gene down-regulation by thiol antioxidants and underlying signaling pathway remain unclear. In this study we have examined, whether the scavenging of reactive oxygen and reactive nitrogen species (ROS and RNS) is the major cause for thiol-mediated suppression of the HOX-1 induction by NO. Further, to identify the ROS family members implicated in the HOX-1 induction, we also exposed cells to various non-thiol antioxidants: dimethyl sulfoxide, dimetylthiourea, sodium salicylate, sodium formate, uric acid, catalase, and superoxide dismutase. A partial inhibition of HOX-1 induction occurred in the presence of non-polar hydroxyl radical scavengers, dimethyl sulfoxide and dimetylthiourea. The other non-thiol antioxidants were ineffective towards HOX-1 expression. Then, in order to determine, whether RNS scavenging is implicated in the HOX-1 down-regulation by thiol antioxidants, we took advantage of the capacity of suboptimal concentrations of the NO scavenger PTIO (2-phenyl-4,4,5,5-tetramethylimidazole-1-oxyl-3-oxide) to oxidize NO to nitrosating species. We showed that simultaneous cell treatment with NO donor and PTIO significantly enhanced the rate of the HOX-1 gene NO-dependent induction indicating that RNS are mediators of HOX-1 gene transcriptional activation. Thiol antioxidants completely suppressed PTIO stimulatory action. These findings imply that inhibitory action of thiol antioxidants is mediated by RNS scavenging. The study provides an approach for pharmacologycal modulation of cell response to NO and its derivatives through the use of antioxidants." @default.
- W2465681305 created "2016-07-22" @default.
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- W2465681305 date "2005-03-19" @default.
- W2465681305 modified "2023-09-23" @default.
- W2465681305 title "[Effect of the antioxidants on NO-dependent induction of heme oxigenase 1 gene in U937 monocytes]." @default.
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