The University of Southampton
University of Southampton Institutional Repository

Hyperoxia-induced lung injury in gamma-glutamyl transferase deficiency is associated with alterations in nitrosative and nitrative stress

Hyperoxia-induced lung injury in gamma-glutamyl transferase deficiency is associated with alterations in nitrosative and nitrative stress
Hyperoxia-induced lung injury in gamma-glutamyl transferase deficiency is associated with alterations in nitrosative and nitrative stress
gamma-Glutamyl transferase (GGT) regulates glutathione metabolism and cysteine supply. GGT inactivation in GGT(enu1) mice limits cysteine availability causing cellular glutathione deficiency. In lung, the resultant oxidant burden is associated with increased nitric oxide (NO) production, yet GGT(enu1) mice still exhibit higher mortality in hyperoxia. We hypothesized that NO metabolism is altered under severe oxidant stress and contributes to lung cellular injury and death. We compared lung injury, NO synthase (NOS) expression, nitrate/nitrite production, nitroso product formation, peroxynitrite accumulation, and cell death in wild-type and GGT(enu1) mice in normoxia and hyperoxia. The role of NOS activity in cell death was determined by NOS inhibition. Exposure of wild-type mice to hyperoxia caused increased lung injury, altered NO metabolism, and induction of cell death compared with normoxia, which was attenuated by NOS inhibition. Each of these lung injury indices were magnified in hyperoxia-exposed GGT(enu1) mice except nitrosation, which showed a diminished decrease compared with wild-type mice. NOS inhibition attenuated cell death only slightly, likely due to further exacerbation of oxidant stress. Taken together, these data suggest that apoptosis in hyperoxia is partially NO-dependent and reiterate the importance of cellular glutathione in lung antioxidant defense. Therefore, reduced denitrosylation of proteins, possibly resulting in impaired cellular repair, and excessive apoptotic cell death likely contribute to increased lung injury and mortality of GGT(enu1) mice in hyperoxia.
0002-9440
2309-2318
Klings, Elizabeth S.
29d7b1c2-0ca2-4ef6-8313-a3cdae476cfe
Lowry, Matthew H
84d954d4-632d-404e-b982-2c1e803f34ab
Li, Guihua
a37a973e-ce60-4d0b-b566-66872ac32018
Jean, Jyh-Chang
7b33d01f-2b81-436c-bff0-cc885d2f03ca
Fernandez, Bernadette O.
27babc73-7646-4908-86e2-6c29d79fb938
Garcia-Saura, Maria F.
a3df7c56-91cf-476d-8de8-ce31a42c13e4
Feelisch, Martin
8c1b9965-8614-4e85-b2c6-458a2e17eafd
Joyce-Brady, Martin
5aa8b48c-ed94-4ebc-9cd4-8a663b763b6b
Klings, Elizabeth S.
29d7b1c2-0ca2-4ef6-8313-a3cdae476cfe
Lowry, Matthew H
84d954d4-632d-404e-b982-2c1e803f34ab
Li, Guihua
a37a973e-ce60-4d0b-b566-66872ac32018
Jean, Jyh-Chang
7b33d01f-2b81-436c-bff0-cc885d2f03ca
Fernandez, Bernadette O.
27babc73-7646-4908-86e2-6c29d79fb938
Garcia-Saura, Maria F.
a3df7c56-91cf-476d-8de8-ce31a42c13e4
Feelisch, Martin
8c1b9965-8614-4e85-b2c6-458a2e17eafd
Joyce-Brady, Martin
5aa8b48c-ed94-4ebc-9cd4-8a663b763b6b

Klings, Elizabeth S., Lowry, Matthew H, Li, Guihua, Jean, Jyh-Chang, Fernandez, Bernadette O., Garcia-Saura, Maria F., Feelisch, Martin and Joyce-Brady, Martin (2010) Hyperoxia-induced lung injury in gamma-glutamyl transferase deficiency is associated with alterations in nitrosative and nitrative stress. The American Journal of Pathology, 175 (6), 2309-2318. (doi:10.2353/ajpath.2009.081017). (PMID:19850887)

Record type: Article

Abstract

gamma-Glutamyl transferase (GGT) regulates glutathione metabolism and cysteine supply. GGT inactivation in GGT(enu1) mice limits cysteine availability causing cellular glutathione deficiency. In lung, the resultant oxidant burden is associated with increased nitric oxide (NO) production, yet GGT(enu1) mice still exhibit higher mortality in hyperoxia. We hypothesized that NO metabolism is altered under severe oxidant stress and contributes to lung cellular injury and death. We compared lung injury, NO synthase (NOS) expression, nitrate/nitrite production, nitroso product formation, peroxynitrite accumulation, and cell death in wild-type and GGT(enu1) mice in normoxia and hyperoxia. The role of NOS activity in cell death was determined by NOS inhibition. Exposure of wild-type mice to hyperoxia caused increased lung injury, altered NO metabolism, and induction of cell death compared with normoxia, which was attenuated by NOS inhibition. Each of these lung injury indices were magnified in hyperoxia-exposed GGT(enu1) mice except nitrosation, which showed a diminished decrease compared with wild-type mice. NOS inhibition attenuated cell death only slightly, likely due to further exacerbation of oxidant stress. Taken together, these data suggest that apoptosis in hyperoxia is partially NO-dependent and reiterate the importance of cellular glutathione in lung antioxidant defense. Therefore, reduced denitrosylation of proteins, possibly resulting in impaired cellular repair, and excessive apoptotic cell death likely contribute to increased lung injury and mortality of GGT(enu1) mice in hyperoxia.

This record has no associated files available for download.

More information

Published date: 1 December 2010
Organisations: Clinical & Experimental Sciences

Identifiers

Local EPrints ID: 337701
URI: http://eprints.soton.ac.uk/id/eprint/337701
ISSN: 0002-9440
PURE UUID: a0440774-8cb8-4879-9411-6c965b48e01b
ORCID for Martin Feelisch: ORCID iD orcid.org/0000-0003-2320-1158

Catalogue record

Date deposited: 02 May 2012 08:49
Last modified: 15 Mar 2024 03:41

Export record

Altmetrics

Contributors

Author: Elizabeth S. Klings
Author: Matthew H Lowry
Author: Guihua Li
Author: Jyh-Chang Jean
Author: Bernadette O. Fernandez
Author: Maria F. Garcia-Saura
Author: Martin Feelisch ORCID iD
Author: Martin Joyce-Brady

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×