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Inventi Impact - Pulmonology
(Formerly Inventi Rapid/Impact: Lungs)

Articles

  • Inventi:hln/84/14
    THE VITAMIN E ISOFORMS ?-TOCOPHEROL AND ?-TOCOPHEROL HAVE OPPOSITE ASSOCIATIONS WITH SPIROMETRIC PARAMETERS: THE CARDIA STUDY
    Michelle E Marchese, Rajesh Kumar, Laura A Colangelo, Pedro C Avila, David R Jacobs Jr, Myron Gross, Akshay Sood, Kiang Liu, Joan M Cook-Mills

    Background: Clinical studies of the associations of vitamin E with lung function have reported conflicting results. However, these reports primarily examine the a-tocopherol isoform of vitamin E and have not included the isoform ?-tocopherol which we recently demonstrated in vitro opposes the function of a-tocopherol. We previously demonstrated, in vitro and in animal studies, that the vitamin E isoform a-tocopherol protects, but the isoform ?-tocopherol promotes lung inflammation and airway hyperresponsiveness. Methods: To translate these findings to humans, we conducted analysis of 4526 adults in the Coronary Artery Risk Development in Young Adults (CARDIA) multi-center cohort with available spirometry and tocopherol data in blacks and whites. Spirometry was obtained at years 0, 5, 10, and 20 and serum tocopherol was from years 0, 7 and 15 of CARDIA. Results: In cross-sectional regression analysis at year 0, higher ?-tocopherol associated with lower FEV1 (p = 0.03 in blacks and p = 0.01 in all participants) and FVC (p = 0.01 in blacks, p = 0.05 in whites, and p = 0.005 in all participants), whereas higher a-tocopherol associated with higher FVC (p = 0.04 in blacks and whites and p = 0.01 in all participants). In the lowest quartile of a-tocopherol, higher ?-tocopherol associated with a lower FEV1 (p = 0.05 in blacks and p = 0.02 in all participants). In contrast, in the lowest quartile of ?-tocopherol, higher a-tocopherol associated with a higher FEV1 (p = 0.03) in blacks. Serum ?-tocopherol >10 µM was associated with a 175–545 ml lower FEV1 and FVC at ages 21–55 years. Conclusion: Increasing serum concentrations of ?-tocopherol were associated with lower FEV1 or FVC, whereas increasing serum concentrations of a-tocopherol was associated with higher FEV1 or FVC. Based on the prevalence of serum ?-tocopherol >10 µM in adults in CARDIA and the adult U.S. population in the 2011 census, we expect that the lower FEV1 and FVC at these concentrations of serum ?-tocopherol occur in up to 4.5 million adults in the population.

    How to Cite this Article
    CC Compliant Citation: Marchese et al.: The vitamin E isoforms ?-tocopherol and ?-tocopherol have opposite associations with spirometric parameters: the CARDIA study. Respiratory Research 2014 15:31, doi:10.1186/1465-9921-15-31.
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