Interleukin 18 levels in patients with stable coronary artery disease is associated with IL18RAP and IL18R1 gene polymorphism and the risk of myocardial infarction

Aim. To determine the relationship between the serum interleukin (IL) 18 level, the carriage of variant alleles IL18, IL18R1, IL18RAP and the risks of myocardial infarction (MI), hypertension, multifocal atherosclerosis in patients with stable coronary artery disease (CAD).

Material and methods. Two hundred and sixty patients with stable coronary artery disease living in a large industrial region ofWestern Siberia were examined. Serum IL18 concentrations was determined by the enzyme immunoassay. Genotyping was performed by real-time polymerase chain reaction using TaqMan technology.

Results. We revealed associations of rs13015714 IL18R1 and rs917997 IL18RAP sites with the MI risk (odds ratio (OR), 1,95 [95% confidence interval (CI), 1,063,58], p=0,029; OR, 2,01 [95% CI, 1,11-3,64], p=0,018, respectively). Associations of rs13015714 and rs917997 sites with high IL18 concentrations (genotypes C/T + T/T 488,0 [321,0, 687,2] pg/ml and T/G + G/G 504,2 [275,6; 655,5] pg/ml) was observed.

Conclusion. The relationship between the minor alleles of rs13015714 IL18R1 and rs917997 IL18RAP sites with an increased risk of MI in patients with stable CAD was shown. Also, polymorphism at rs13015714 and rs917997 sites provides different levels of circulating IL18. In particular, the carriage of minor alleles is associated with increased IL-18 levels in patients with previous MI and multifocal atherosclerosis or hypertension, as well as with an increase in the risk of these pathologies.

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