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An integrated approach to assessing nitroso-redox balance in systemic inflammation

An integrated approach to assessing nitroso-redox balance in systemic inflammation
An integrated approach to assessing nitroso-redox balance in systemic inflammation
Most studies examining the metabolic fate of NO during systemic inflammation have focused on measuring the quantitatively predominating, stable anions nitrite and nitrate within the circulation. However, these are not necessarily the NO-related products that govern NO metabolism and signaling in tissues. We assessed all major NO derivatives temporally in blood and vital organs during inflammation and explored their relationship to insult severity and redox status. Male rats receiving intraperitoneal endotoxin or vehicle were sacrificed for organ and blood sampling between 0 and 24 h. Endotoxin induced transient and organ-specific changes in a variety of NO metabolites. Nitrite and nitrate increased, peaking at 8 and 12 h, respectively. S- and N-nitrosation and heme-nitrosylation products also peaked at 8 h; these posttranslational protein modifications were associated with decreased myocardial function (echocardiography). Evidence of oxidative stress and systemic inflammation was also obtained. The rise in most NO derivatives was proportional to insult severity. All metabolite levels normalized within 24 h, despite evidence of persisting myocardial dysfunction and clinical unwellness. Our findings point to a complex interplay between NO production, antioxidant defense, and redox status. Although the precise (patho)physiologic roles of specific NO derivatives and their diagnostic/prognostic utility await further investigation, nitroso species in erythrocytes are the most sensitive markers of NO in systemic inflammation, detectable before clinical symptoms manifest.
nitrite, nitric oxide, sepsis, endotoxin, nitrosation, nitrosylation, free radicals
0891-5849
1137-1145
Dyson, Alex
e288e219-cdac-4c63-85c6-9c2b6cdb194c
Bryan, Nathan S
1983aefc-d955-4e40-9463-07b24128e5ea
Fernandez, Bernadette O
64fe5c50-1fda-4a15-a306-68491abff575
Garcia-Saura, Maria-Francisca
54f3d1ef-7a2d-48ab-bfc7-e2dc80381bb3
Saijo, Fumito
c66d3d87-1cdf-4f51-af1c-fdd1c7e772ea
Mongardon, Nicolas
5d50d0af-b8de-410c-ab63-347bd0443f47
Rodriguez, Juan
055ad15f-3cf3-4366-a11c-9a313cf2fa60
Singer, Mervyn
87229716-c753-44ab-a382-3f93c1c5441d
Feelisch, Martin
8c1b9965-8614-4e85-b2c6-458a2e17eafd
Dyson, Alex
e288e219-cdac-4c63-85c6-9c2b6cdb194c
Bryan, Nathan S
1983aefc-d955-4e40-9463-07b24128e5ea
Fernandez, Bernadette O
64fe5c50-1fda-4a15-a306-68491abff575
Garcia-Saura, Maria-Francisca
54f3d1ef-7a2d-48ab-bfc7-e2dc80381bb3
Saijo, Fumito
c66d3d87-1cdf-4f51-af1c-fdd1c7e772ea
Mongardon, Nicolas
5d50d0af-b8de-410c-ab63-347bd0443f47
Rodriguez, Juan
055ad15f-3cf3-4366-a11c-9a313cf2fa60
Singer, Mervyn
87229716-c753-44ab-a382-3f93c1c5441d
Feelisch, Martin
8c1b9965-8614-4e85-b2c6-458a2e17eafd

Dyson, Alex, Bryan, Nathan S, Fernandez, Bernadette O, Garcia-Saura, Maria-Francisca, Saijo, Fumito, Mongardon, Nicolas, Rodriguez, Juan, Singer, Mervyn and Feelisch, Martin (2011) An integrated approach to assessing nitroso-redox balance in systemic inflammation. Free Radical Biology and Medicine, 51 (6), 1137-1145. (doi:10.1016/j.freeradbiomed.2011.06.012). (PMID:21718783)

Record type: Article

Abstract

Most studies examining the metabolic fate of NO during systemic inflammation have focused on measuring the quantitatively predominating, stable anions nitrite and nitrate within the circulation. However, these are not necessarily the NO-related products that govern NO metabolism and signaling in tissues. We assessed all major NO derivatives temporally in blood and vital organs during inflammation and explored their relationship to insult severity and redox status. Male rats receiving intraperitoneal endotoxin or vehicle were sacrificed for organ and blood sampling between 0 and 24 h. Endotoxin induced transient and organ-specific changes in a variety of NO metabolites. Nitrite and nitrate increased, peaking at 8 and 12 h, respectively. S- and N-nitrosation and heme-nitrosylation products also peaked at 8 h; these posttranslational protein modifications were associated with decreased myocardial function (echocardiography). Evidence of oxidative stress and systemic inflammation was also obtained. The rise in most NO derivatives was proportional to insult severity. All metabolite levels normalized within 24 h, despite evidence of persisting myocardial dysfunction and clinical unwellness. Our findings point to a complex interplay between NO production, antioxidant defense, and redox status. Although the precise (patho)physiologic roles of specific NO derivatives and their diagnostic/prognostic utility await further investigation, nitroso species in erythrocytes are the most sensitive markers of NO in systemic inflammation, detectable before clinical symptoms manifest.

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More information

e-pub ahead of print date: 14 June 2011
Published date: 15 September 2011
Keywords: nitrite, nitric oxide, sepsis, endotoxin, nitrosation, nitrosylation, free radicals
Organisations: Clinical & Experimental Sciences

Identifiers

Local EPrints ID: 337692
URI: http://eprints.soton.ac.uk/id/eprint/337692
ISSN: 0891-5849
PURE UUID: e3aa7540-7a54-49b3-b1a2-d3ce7668ec17
ORCID for Martin Feelisch: ORCID iD orcid.org/0000-0003-2320-1158

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Date deposited: 02 May 2012 12:45
Last modified: 15 Mar 2024 03:41

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Contributors

Author: Alex Dyson
Author: Nathan S Bryan
Author: Bernadette O Fernandez
Author: Maria-Francisca Garcia-Saura
Author: Fumito Saijo
Author: Nicolas Mongardon
Author: Juan Rodriguez
Author: Mervyn Singer
Author: Martin Feelisch ORCID iD

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