Association of tumor necrosis factor-alpha polymorphisms and ozone-induced change in lung function.
Ozone is a major air pollutant with adverse health effects which exhibit marked inter-individual variability. In mice, regions of genetic linkage with ozone-induced lung injury include the tumor necrosis factor-alpha (TNF), lymphotoxin-alpha (LTA), Toll-like receptor 4 (TLR4), superoxide dismutase (SOD2), and glutathione peroxidase (GPX1) genes. We genotyped polymorphisms in these genes in 51 individuals who had undergone ozone challenge. Mean change in FEV1 with ozone challenge, as a percentage of baseline, was -3% in TNF -308G/A or A/A individuals, compared with -9% in G/G individuals (p = 0.024). When considering TNF haplotypes, the smallest change in FEV1 with ozone exposure was associated with the TNF haplotype comprising LTA +252G/TNF -1031T/TNF -308A/TNF -238G. This association remained statistically significant after correction for age, sex, disease, and ozone concentration (p = 0.047). SOD2 or GPX1 genotypes were not associated with lung function, and the TLR4 polymorphism was too infrequent to analyze. The results of this study support TNF as a genetic factor for susceptibility to ozone-induced changes in lung function in humans, and has potential implications for stratifying health risks of air pollution.
Asthma Genetics Laboratory, Human Genetics Division, University of Southampton, United Kingdom. Ian_Yang@health.qld.gov.au
Ian A
IA
Yang
Olaf
O
Holz
Rudolf A
RA
Jörres
Helgo
H
Magnussen
Sheila J
SJ
Barton
Santiago
S
Rodríguez
Julie A
JA
Cakebread
John W
JW
Holloway
Stephen T
ST
Holgate
D000328:Adult; D005260:Female; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008171:Lung Diseases / Q000453:epidemiology / Q000209:etiology* / Q000235:genetics*; D008297:Male; D010126:Ozone / Q000009:adverse effects*; D011110:Polymorphism, Genetic; D012129:Respiratory Function Tests; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
D014409:Tumor Necrosis Factor-alpha; D010126:Ozone