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. 1998 Aug;53(8):677–679. doi: 10.1136/thx.53.8.677

Acute inhalation of cigarette smoke increases lower respiratory tract nitric oxide concentrations

D Chambers 1, W Tunnicliffe 1, J Ayres 1
PMCID: PMC1745302  PMID: 9828855

Abstract

BACKGROUND—Cigarette smoking is associated with a number of common pulmonary diseases including chronic airflow limitation and bronchial carcinoma. Lower respiratory tract (LRT) nitric oxide (NO) concentrations are reduced in habitual cigarette smokers between cigarettes, and although this finding has been implicated in the pathogenesis of smoking related disease, the underlying mechanisms are unclear. A study was undertaken to determine the nature and time course for changes in LRT NO concentrations following acute inhalation of cigarette smoke.
METHODS—Twenty four healthy habitual smokers were studied. The concentration of LRT NO in exhaled breath before, one and ten minutes after smoking a single cigarette was measured using chemiluminescence.
RESULTS—LRT NO concentrations increased in all subjects from a mean (SE) of 2.6 (0.27) to 4.8 (0.26) ppb (p<0.0001) at one minute, and at 10 minutes remained significantly raised above the baseline level at 3.2 (0.25) ppb (p = 0.003). The mean (95% CI) increases in NO concentrations were 2.2 (1.7 to 2.7) and 0.6 (0.2 to 1.0) ppb, respectively.
CONCLUSIONS—These findings were unexpected in both their direction and time course. They suggest a novel mechanism for the handling of NO in the human lung. We hypothesise that NO is trapped in the epithelial lining fluid (ELF) of the normal human respiratory tract in bioequivalent forms such as S-nitrosothiols or peroxynitrite and that this trapping mechanism is sensitive to the redox state of the ELF. LRT NO concentrations will thus increase with oxidant exposure and decline as pulmonary antioxidant defence mechanisms take effect. These findings may have implications for the pathogenesis and diagnosis of oxidant mediated pulmonary disease.



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Selected References

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