Yucesoy-B; Vallyathan-V; Landsittel-DP; Sharp-DS; Weston-A; Burleson-GR; Simeonova-P; McKinstry-M; Luster-MI
Toxicol Appl Pharmacol 2001 Apr; 172(1):75-82
Silicosis, an interstitial lung disease prevalent among miners, sand blasters, and quarry workers, is manifested as a chronic inflammatory response leading to severe pulmonary fibrotic changes. Proinflammatory cytokines, such as TNFalpha and IL-1, produced in the lung by type II epithelial cells and alveolar macrophages, have been strongly implicated in the formation of these lesions. Recently, a number of single nucleotide polymorphisms (SNPs), which quantitatively affect mRNA synthesis, have been identified in the TNFalpha promoter and IL-1 gene cluster and their frequency is associated with certain chronic inflammatory diseases. To assess the role of these SNPs in silicosis, we examined their frequency in 325 ex-miners with moderate and severe silicosis and 164 miners with no lung disease. The odds ratio of disease for carriers of the minor variant, TNFalpha (-238), was markedly higher for severe silicosis (4.0) and significantly lower for moderate silicosis (0.52). Regardless of disease severity, the odds ratios of disease for carriers of the IL-1RA (+2018) or TNFalpha (-308) variants were elevated. There were no significant consistent differences in the distribution of the IL-1alpha (+4845) or IL-1beta (+3953) variants with respect to disease status. In addition, several significant gene-gene and gene-gene-environment interactions were observed. Different associations between moderate cases and controls versus severe cases and controls were also observed in a number of these multigene comparisons. These studies suggest that gene-environment interactions involving cytokine polymorphisms play a significant role in silicosis by modifying the extent of and susceptibility to disease.
Genes; Silicosis; Epidemiology; Genetic-factors; Genetics; Lung-disease; Pulmonary-system-disorders; Respiratory-system-disorders; Demographic-characteristics
Toxicology and Molecular Biology Branch, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, West Virginia 26505, USA
Toxicology and Applied Pharmacology