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- W2000523615 abstract "Nitric oxide (NO) plays an important role in a number of physiological processes in the airways, including host defense. Although the exact cellular and molecular source of the NO formation in airways is unknown, there is recent evidence that neuronal NO synthase (NOS1) contributes significantly to NO in the lower airways of cystic fibrosis (CF) patients. NOS1 protein has been shown to be expressed in nasal epithelium, suggesting an involvement of NOS1-derived NO in upper airway biology. We here hypothesized that nasal NO concentrations in CF patients are related to genotype variants in the NOS1 gene. Measurements of nasal NO concentration and pulmonary function were performed in 40 clinically stable CF patients. Genomic DNA from all patients was screened for an intronic AAT-repeat polymorphism in the NOS1 gene using polymerase chain reaction and simple sequence length polymorphism (SSLP) analysis. The allele size at that locus was significantly (P = 0.001) associated with upper airway NO. Mean (+/- SD) nasal NO concentrations were 40.5 +/- 5.2 ppb in CF patients (n = 12) with high repeat numbers (i.e., both alleles > or =12 repeats) and 72.6 +/- 7.4 ppb in patients (n = 28) with low repeat numbers (i.e., at least one allele <12 repeats). Furthermore, in the group of CF patients harboring NOS1 genotypes associated with low nasal NO, colonization of airways with P. aeruginosa was significantly more frequent than in patients with NOS1 genotypes associated high nasal NO concentrations (P = 0.0022). We conclude that (1) the variability in CF nasal NO levels are related to naturally occurring variants in the NOS1 gene, and (2) that nasal NOS1-derived NO affects the susceptibility of CF airways to infection with P. aeruginosa." @default.
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- W2000523615 date "2002-03-01" @default.
- W2000523615 modified "2023-09-25" @default.
- W2000523615 title "Nasal Nitric Oxide Levels in Cystic Fibrosis Patients Are Associated with a Neuronal NO Synthase (NOS1) Gene Polymorphism" @default.
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- W2000523615 doi "https://doi.org/10.1006/niox.2001.0408" @default.
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