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Glutathione S-Transferase Variants and Their Interaction with Smoking on Lung Function

The James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia; Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada; and Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota

Correspondence and requests for reprints should be addressed to Andrew J. Sandford, Ph.D., UBC James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, St. Paul's Hospital, 1081 Burrard Street, Vancouver, BC, V6Z 1Y6 Canada. E-mail: asandford{at}mrl.ubc.ca

We studied glutathione S-transferase (GST) polymorphisms in 1,098 whites with the lowest (n = 544, FEV₁ % predicted mean ± SEM = 62.6 ± 0.1) and the highest (n = 554, FEV₁ % predicted mean ± SEM = 91.8 ± 0.1) lung function at the beginning of the Lung Health Study. Homozygosity for GSTP1 105Val was significantly more frequent in the low- than in the high-function group (13.2 vs. 9.3%) (odds ratio = 1.69, 95% confidence interval [CI] = 1.11–2.61, p = 0.016), after adjustment for confounding variables. Subjects with 105Val homozygotes had higher rates of lung function decline in the high-function group (p = 0.017). The frequencies of GSTM1, GSTT1 null genotypes were similar between the high- and low-function groups, but subjects with the GSTT1 null genotype had a faster decline of lung function in the low-function group (p = 0.032). In addition, there was a significant interaction of GSTT1 genotype and pack-years on lung function. When comparing individuals with GSTT1 null genotype with wild type, the adjusted odds ratio was 3.49 (95% CI, 1.48–8.39, p = 0.005) in mild smokers ( 25 pack years). We conclude that GST genotypes are risk factors for rapid decline or low lung function in smokers with mild to moderate airflow obstruction.

Key Words: cigarette smoking • FEV₁ • gene–environment interaction • genetic polymorphism • glutathione S-transferase

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