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• W2022069503 abstract "Bilirubin-IX-alpha (BR) is an endogenous molecule with a strong antioxidant feature due to its ability to scavenge free radicals. In this paper, we demonstrated that BR, at concentrations close to those found within the cell (0.1-2.5 microM), acted as a denitrosylating agent and increased the release of nitric oxide from S-nitrosoglutathione (GSNO) and S-nitrosocysteine (SNOC) (2.5 microM). The complexation of BR with saturating concentrations of human serum albumin (HSA, 2.5 microM) did not further increase nitric oxide release from GSNO and SNOC. At concentrations similar to those reached in plasma (5-20 microM), BR denitrosylated S-nitroso-HSA (2.5 microM), the main circulating S-nitrosothiol, and this effect was potentiated by the complexation of BR with saturating HSA (20 microM). Furthermore, the product(s) of the reaction between nitric oxide and BR were identified. Ultraviolet and mass spectrometry analysis revealed that nitric oxide binds to BR forming a N-nitroso derivative (BR-nitric oxide) with extinction coefficients of 1.393 mM(-1)cm(-1) and 2.254 mM(-1)cm(-1) in methanol and NaOH, respectively. The formation of BR-nitric oxide did not occur only in a reconstituted system, but was confirmed in rat fibroblasts exposed to pro-oxidant stimuli. These results provided novel insights on the antioxidant characteristic of BR through its interaction with nitric oxide, a gaseous neurotransmitter with a well-known dual effect, namely neuroprotective under physiological conditions or neurotoxic if produced in excess, and proposed BR-nitric oxide as a new biomarker of oxidative/nitrosative stress." @default.
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• W2022069503 date "2009-08-01" @default.
• W2022069503 modified "2023-10-01" @default.
• W2022069503 title "Characterization of the S-denitrosylating activity of bilirubin" @default.
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• W2022069503 doi "https://doi.org/10.1111/j.1582-4934.2009.00680.x" @default.
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