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- W2162817186 abstract "Lipopolysaccharide (LPS) is known to generate nitric oxide (NO) in the airway through the activation of nitric-oxide synthase (NOS). The functional consequences of this on the inflammatory response are not clear, with conflicting data published. In the clinic, exhaled NO (ex-NO) is used as a noninvasive biomarker to assess the extent of airway inflammation. It is proposed that monitoring levels of ex-NO could be a useful guide to determining the effectiveness of disease modifying therapies. The aim was, using pharmacological tools, to determine the role of NO in an aerosolized LPS-driven animal model of airway inflammation by assessment of ex-NO, neutrophilia, and inflammatory biomarkers, using a nonselective NOS inhibitor, <i>N</i><sup>G</sup>-nitro-l-arginine methyl ester (l-NAME), and a selective inducible NOS (iNOS) inhibitor, <i>N</i>-3 (aminomethyl)benzyl)acetamidine (1400W). Real-time mRNA analysis of the lung tissue indicated an increased gene expression of iNOS following LPS challenge with minimal impact on constitutive NOS isoforms. LPS induced an increase in ex-NO, which appeared to correlate with the increase in iNOS gene expression and airway neutrophilia. Treatment with l-NAME and 1400W resulted in comparable reductions in ex-NO, a reduction in airway neutrophilia, but had little impact on a range of inflammatory biomarkers. This study indicates that the LPS-induced rise in ex-NO is due to enhanced iNOS activity and that NO has a role in airway neutrophilia. Additionally, it appears using ex-NO as a guide to monitoring airway inflammation may have some use, but data should be interpreted with caution when assessing therapies that may directly impact on NO formation." @default.
- W2162817186 created "2016-06-24" @default.
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- W2162817186 date "2004-06-29" @default.
- W2162817186 modified "2023-09-27" @default.
- W2162817186 title "Nitric Oxide as a Noninvasive Biomarker of Lipopolysaccharide-Induced Airway Inflammation: Possible Role in Lung Neutrophilia" @default.
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- W2162817186 doi "https://doi.org/10.1124/jpet.104.068890" @default.
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