Obesity-asthma association: Is it explained by systemic oxidant stress?

Akshay Sood, Clifford Qualls, Alexander Arynchyn, William S. Beckett, Myron D. Gross, Michael W. Steffes, Lewis J. Smith, Paul Holvoet, Bharat Thyagarajan, David R. Jacobs

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23 Scopus citations

Abstract

Background: The mechanism for the obesity-asthma association is unknown. This study evaluated the hypothesis that systemic oxidant stress explains this association. Methods: This cross-sectional study used year-20 follow-up evaluation data of 2,865 eligible participants in the Coronary Artery Risk Development in Young Adults (CARDIA) cohort. Current asthma was self-reported. Oxidant stress primarily was assessed by plasma F2-isoprostane concentrations. Obesity measures included categories of BMI and dual-energy x-ray absorptiometry-assessed fat mass index (FMI) and lean mass index (LMI). Logistic and linear regressions were used for analyses. Results: Asthma was associated with higher plasma F2-isoprostane concentrations (p = 0.049); however, this association was not significant when adjusted for either gender or BMI. The BMI-asthma association was seen only among women (p = 0.03; gender-specific interaction, p = 0.01), and this association was not explained by plasma F2-isoprostane levels. Similarly, both FMI and LMI were positively associated with asthma in women (p = 0.20 and 0.01, respectively). These associations also were not explained by plasma F2-isoprostane levels. Similar results were obtained when plasma levels of oxidized low-density lipoprotein were used instead of F2-isoprostane levels to study the BMI-asthma association at the year-15 evaluation. Conclusions: Systemic oxidant stress, primarily assessed by plasma F2-isoprostane concentrations, was not independently associated with asthma and, therefore, may not explain the obesity-asthma association in women. The asthma-oxidant stress association is confounded by gender and obesity. This study is limited by the inability to measure airway oxidant stress. It is possible that another (as yet undetermined) measure of systemic oxidant stress may be more relevant in asthma.

Original languageEnglish (US)
Pages (from-to)1055-1062
Number of pages8
JournalCHEST
Volume136
Issue number4
DOIs
StatePublished - Oct 1 2009

Bibliographical note

Funding Information:
Funding/Support: This study was supported by CARDIA contracts N01-HC-48047–50 and N01-HC-95095 and by an ancillary study grant R01 HL 53560 . Dr. Sood is supported by the University of New Mexico Clinical Translational Science Center Scholar Award and by Department of Health and Human Services/National Institutes of Health/National Center for Research Resources/GCRC grant No. 5M01 RR00997 . Dr. Steffes has several grants/contracts from the National Institute of Diabetes and Digestive and Kidney Diseases; the National Heart, Lung, and Blood Institute; and the National Institute of Child Health and Human Development.

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