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Key bioactive reaction products of the NO/H2S interaction are S/N-hybrid species, polysulfides, and nitroxyl
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Cortese-Krott, Miriam M., Kuhnle, Gunter G. C., Dyson, Alex, Fernandez, Bernadette O., Grman, Marian, DuMond, Jenna F., Barrow, Mark P., McLeod, George, Nakagawa, Hidehiko, Ondrias, Karol, Nagy, Péter, King, S. Bruce, Saavedra, Joseph E., Keefer, Larry K., Singer, Mervyn, Kelm, Malte, Butler, Anthony R. and Feelisch, Martin (2015) Key bioactive reaction products of the NO/H2S interaction are S/N-hybrid species, polysulfides, and nitroxyl. Proceedings of the National Academy of Sciences of the United States of America, 112 (34). E4651-E4660. doi:10.1073/pnas.1509277112 ISSN 0027-8424.
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Official URL: http://dx.doi.org/10.1073/pnas.1509277112
Abstract
Experimental evidence suggests that nitric oxide (NO) and hydrogen sulfide (H2S) signaling pathways are intimately intertwined, with mutual attenuation or potentiation of biological responses in the cardiovascular system and elsewhere. The chemical basis of this interaction is elusive. Moreover, polysulfides recently emerged as potential mediators of H2S/sulfide signaling, but their biosynthesis and relationship to NO remain enigmatic. We sought to characterize the nature, chemical biology, and bioactivity of key reaction products formed in the NO/sulfide system. At physiological pH, we find that NO and sulfide form a network of cascading chemical reactions that generate radical intermediates as well as anionic and uncharged solutes, with accumulation of three major products: nitrosopersulfide (SSNO−), polysulfides, and dinitrososulfite [N-nitrosohydroxylamine-N-sulfonate (SULFI/NO)], each with a distinct chemical biology and in vitro and in vivo bioactivity. SSNO− is resistant to thiols and cyanolysis, efficiently donates both sulfane sulfur and NO, and potently lowers blood pressure. Polysulfides are both intermediates and products of SSNO− synthesis/decomposition, and they also decrease blood pressure and enhance arterial compliance. SULFI/NO is a weak combined NO/nitroxyl donor that releases mainly N2O on decomposition; although it affects blood pressure only mildly, it markedly increases cardiac contractility, and formation of its precursor sulfite likely contributes to NO scavenging. Our results unveil an unexpectedly rich network of coupled chemical reactions between NO and H2S/sulfide, suggesting that the bioactivity of either transmitter is governed by concomitant formation of polysulfides and anionic S/N-hybrid species. This conceptual framework would seem to offer ample opportunities for the modulation of fundamental biological processes governed by redox switching and sulfur trafficking.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
Journal or Publication Title: | Proceedings of the National Academy of Sciences of the United States of America | ||||||
Publisher: | National Academy of Sciences | ||||||
ISSN: | 0027-8424 | ||||||
Official Date: | August 2015 | ||||||
Dates: |
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Volume: | 112 | ||||||
Number: | 34 | ||||||
Page Range: | E4651-E4660 | ||||||
DOI: | 10.1073/pnas.1509277112 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
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