Ozone exposure, antioxidant genes, and lung function in an elderly cohort: VA normative aging study. Issue 11 (4th June 2008)

• Record Type: Journal Article
• Authors: Alexeeff, S E; Litonjua, A A; Wright, R O; Baccarelli, A; Suh, H; Sparrow, D; Vokonas, P S; Schwartz, J
• Is Part Of: Occupational and environmental medicine. Volume 65:Issue 11(2008)
• Page Start: 736
• Page End: 742
• Publication Date: 2008-06-04
• Subjects: Medicine, Industrial -- Periodicals; Environmental health -- Periodicals; 616.980305
• DOI: 10.1136/oem.2007.035253
• Languages: English
• ISSNs: 1351-0711

Abstract

Abstract : Background: Ozone (O3 ) exposure is known to cause oxidative stress. This study investigated the acute effects of O3 on lung function in the elderly, a suspected risk group. It then investigated whether genetic polymorphisms of antioxidant genes (heme oxygenase-1 ( HMOX1 ) and glutathione S -transferase pi ( GSTP1 )) modified these associations. Methods: 1100 elderly men from the Normative Aging Study were examined whose lung function (forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1)) was measured every 3 years from 1995 to 2005. The study genotyped the GSTP1 Ile105Val and Ala114Val polymorphisms and the (GT)n repeat polymorphism in the HMOX1 promoter, classifying repeats as short (n<25) or long (n⩾25). Ambient O3 was measured continuously at locations in the Greater Boston area. Mixed linear models were used, adjusting for known confounders. Results: A 15 ppb increase in O3 during the previous 48 h was associated with a 1.25% decrease in FEV1 (95% CI: −1.96% to −0.54%). This estimated effect was worsened with either the presence of a long (GT)n repeat in HMOX1 (−1.38%, 95% CI: −2.11% to −0.65%) or the presence of an allele coding for Val105 in GSTP1 (−1.69%, 95% CI: −2.63% to −0.75%). A stronger estimated effect of O3 on FEV1 was found in subjects carrying both the GSTP1 105Val variant and the HMOX1 long (GT)n repeat (−1.94%, 95% CI: −2.89% to −0.98%). Similar associations were also found between FVC and O3 exposure. Conclusions: Our results suggest that O3 has an acute effect on lung function in the elderly, and the effects may be modified by the presence of specific polymorphisms in antioxidant genes.