RGD Reference Report - Augmented inducible nitric oxide synthase expression and increased NO production reduce sepsis-induced lung injury and mortality in myeloperoxidase-null mice.

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Augmented inducible nitric oxide synthase expression and increased NO production reduce sepsis-induced lung injury and mortality in myeloperoxidase-null mice.
Authors:	Brovkovych, V Gao, XP Ong, E Brovkovych, S Brennan, ML Su, X Hazen, SL Malik, AB Skidgel, RA
Citation:	Brovkovych V, etal., Am J Physiol Lung Cell Mol Physiol. 2008 Jul;295(1):L96-103. Epub 2008 Apr 18.
RGD ID:	5130966
Pubmed:	PMID:18424617 (View Abstract at PubMed)
PMCID:	PMC2494780 (View Article at PubMed Central)
DOI:	DOI:10.1152/ajplung.00450.2007 (Journal Full-text)
The myeloperoxidase (MPO)-hydrogen peroxide-halide system is an efficient oxygen-dependent antimicrobial component of polymorphonuclear leukocyte (PMN)-mediated host defense. However, MPO deficiency results in few clinical consequences indicating the activation of compensatory mechanisms. Here, we determined possible mechanisms protecting the host using MPO(-/-) mice challenged with live gram-negative bacterium Escherichia coli. We observed that MPO(-/-) mice unexpectedly had improved survival compared with wild-type (WT) mice within 5-12 h after intraperitoneal E. coli challenge. Lungs of MPO(-/-) mice also demonstrated lower bacterial colonization and markedly attenuated increases in microvascular permeability and edema formation after E. coli challenge compared with WT. However, PMN sequestration in lungs of both groups was similar. Basal inducible nitric oxide synthase (iNOS) expression was significantly elevated in lungs and PMNs of MPO(-/-) mice, and NO production was increased two- to sixfold compared with WT. Nitrotyrosine levels doubled in lungs of WT mice within 1 h after E. coli challenge but did not change in MPO(-/-) mice. Inhibition of iNOS in MPO(-/-) mice significantly increased lung edema and reduced their survival after E. coli challenge, but iNOS inhibitor had the opposite effect in WT mice. Thus augmented iNOS expression and NO production in MPO(-/-) mice compensate for the lack of HOCl-mediated bacterial killing, and the absence of MPO-derived oxidants mitigates E. coli sepsis-induced lung inflammation and injury.

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Object Symbol	Species	Term	Qualifier	Evidence	With	Notes	Source	Original Reference(s)
MPO	Human	Sepsis		ISO	Mpo (Mus musculus)		RGD
Mpo	Mouse	Sepsis		IMP			RGD
Mpo	Rat	Sepsis		ISO	Mpo (Mus musculus)		RGD

Objects Annotated

Genes (Rattus norvegicus)

Mpo (myeloperoxidase)

Genes (Mus musculus)

Mpo (myeloperoxidase)

Genes (Homo sapiens)

MPO (myeloperoxidase)

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Augmented inducible nitric oxide synthase expression and increased NO production reduce sepsis-induced lung injury and mortality in myeloperoxidase-null mice.