Background: Cytokines play an important role in skin inflammation.
Objectives: We determined whether polymorphisms in cytokine genes contribute to the occurrence of occupational chronic irritant contact dermatitis (CICD).
Methods: In a case-control study, 9 polymorphisms in the genes coding for interleukin (IL)-1 alpha, IL-1 beta, IL-8, IL-10, and tumour necrosis factor (TNF)-alpha were determined in 197 patients with CICD. 217 apprentices in vocational training for high-risk occupations for CICD served as controls.
Results: For all polymorphisms, no differences in genotype distributions were found between patients and controls. However, in patients with self-reported low levels of wet work and irritant exposure, more TNFA -308 variant genotypes (G/A and A/A) were present compared with those exposed to higher levels or controls, which indicates a TNFA-induced increase of susceptibility. In patients with TNFA -308 variant genotypes, the prevalence of flexural eczema was higher (48% and 57%) compared with that in patients presented with wild-type genotype (30%). Regarding IL1A -889, prevalence of symptoms of dermatitis was lower in apprentices with T/T or C/T genotype (32% and 36%) compared with wild-type genotype (54%, C/C). This indicates a protective effect of these variant alleles in acquiring hand dermatitis.
Conclusions: This study provides evidence that some genetic variations alter susceptibility to (chronic) dermatitis. Knowledge of the impact of genetic differences on the risk of CICD is essential in predictive testing of individuals at risk.
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