IL-1A gene variation in relation to cytokine levels and clinical characteristics in ankylosing spondylitis

• Published in: European journal of rheumatology 2019-04, Vol.6 (2), p.67-67
• Main Authors: Nossent, Johannes C, Sagen-Johnsen, Sylvia, Bakland, Gunnstein
• Format: Article
• Language: English
• Subjects: Ankylosing spondylitis; Blood tests; C-reactive protein; Cancer treatment; Cytokines; Enzyme-linked immunosorbent assay; Erythrocyte sedimentation rate; Gene expression; Genes; Genetic aspects; Genetic polymorphisms; Genetic variation; Genotypes; Heart diseases; Interleukin-1; Medical research; Mortality; Necrosis; Original; Regression analysis; Single nucleotide polymorphisms; Spondylitis; Tumor necrosis factor; Tumors
• ISSN: 2147-9720; 2148-4279
• DOI: 10.5152/eurjrheum.2018.18150

Variations in the IL-1 alpha (IL-A) gene increase the risk for ankylosing spondylitis (AS), but the pathway underlying this association is not fully understood. As IL-1A is primarily a regulatory cytokine, we investigated the influence of IL-1A gene variation on disease severity and cytokine expression in AS. This was a cross sectional study of tumor necrosis factor inhibitors (TNFi)-naïve AS patients (n=334, 90% B27 +, age 45 years) fulfilling the modified New York criteria. We recorded demographics, clinical findings, spinal mobility, Bath AS Functional Index (BASFI), and routine lab findings. IL-1A genotyping for three AS-associated single nucleotide polymorphism (SNP; rs2856836, rs17561 and rs1894399) was performed using Taqman RT-PCR, with TNF, IL-6, IL-17A, and IL-23 levels measured using ELISA. Genotypic associations included logistic regression analysis for genotype (codominant model) and global haplotype (threshold 5%) associations with cytokine levels and clinical features. The three variants were in near complete linkage disequilibrium and formed two only common haplotypes (ACC 67%, GAT 33%). The levels for TNF, IL-6, IL-17A, IL-23, C-reactive protein (CRP), and erythrocyte sedimentation rate (ESR) were similar across genotypes and haplotypes (all p-values >0.4) as were the measures for spinal mobility and BASFI. The TAQ haplotype showed a borderline significant trend with reduced heart disease and mortality during follow-up. IL-1A gene cluster variations do not have an impact on the clinical disease measures or cytokine levels in AS, suggesting that IL-1A has no direct role in AS.