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  • Title: The role of lipoxin A4 in exercise-induced bronchoconstriction in asthma.
    Author: Tahan F, Saraymen R, Gumus H.
    Journal: J Asthma; 2008 Mar; 45(2):161-4. PubMed ID: 18350409.
    Abstract:
    BACKGROUND: The pathogenesis of exercise-induced bronchoconstriction in asthma is incompletely understood, and the role of lipoxin A4 has not been investigated. OBJECTIVE: To investigate the involvement of lipoxin A4 in exercise-induced bronchoconstriction. METHODS: Two groups of children were enrolled in the study: asthmatic children with positive (n = 12) and negative (n = 8) responses to exercise. Levels of lipoxin A4 were determined in plasma before and immediately after exercise challenge using enzyme-linked immunosorbent assay. RESULTS: No significant difference was observed in the pre-exercise lipoxin A4 levels among the groups (p > 0.05). A significant difference was observed in the postexercise lipoxin A4 levels between the two groups (p = 0.041). We also observed significant decreases in plasma lipoxin A4 levels immediately after exercise challenge both in asthmatic children with positive responses to exercise (p = 0.013) and negative responses to exercise (p = 0.05). But these levels were significantly higher in asthmatic children with negative responses to exercise (p = 0.041). There was an inverse correlation between lipoxin A4 levels and a reduction in forced expiratory volume at one second percent after exercise (p = 0.045, r = -0.465). CONCLUSION: Our results are the first demonstration of the lower levels of lipoxin A4 associated with exercise-induced bronchoconstriction in asthma. We hypothesize that the development of exercise-induced bronchoconstriction in asthmatic children may be in relation to a reduced endogenous lipoxin biosynthetic capability. Lipoxin mimetics and related compounds could provide novel therapeutic approaches to the treatment of exercise-induced bronchoconstriction in asthma.
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