Abstract
Reactive nitrogen species have been implicated in the pathogenesis of over 40 human diseases, including inflammation. Evidences suggest that reactive nitrogen species such as nitrite/nitrate and halogenated oxidant-HOCl accumulate at the site of inflammation. At physiologically attainable concentrations, HOCl was found to significantly damage the antiproteolytic potential of human α2M and induce subtle changes in conformation as judged by fluorescence analysis. Our studies further suggest that at physiological concentrations, nitrite offered significant protection against HOCl induced α2M inactivation. Our studies suggest that nitrite may act as an antioxidant at physiological concentrations by removing HOCl at sites where both NO2 and HOCl are formed.
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Abbreviations
- α2M:
-
Alpha-2-Macroglobulin
- HOCl:
-
Hypochlorous acid
- NO2 :
-
Nitrite
- NO2 − :
-
Nitrite anion
- NO:
-
Nitric oxide
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Acknowledgments
MWK would like to thank the Indian Council of Medical Research, New Delhi for a research fellowship. FHK acknowledges the generous financial support provided by UGC-DRS program for this study.
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Wasim Khan, M., Naqshbandi, A., Zubair, H. et al. Nitrite, a Reactive Nitrogen Species, Protects Human Alpha-2-Macroglobulin from Halogenated Oxidant, HOCl. Protein J 29, 276–282 (2010). https://doi.org/10.1007/s10930-010-9249-1
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DOI: https://doi.org/10.1007/s10930-010-9249-1