Abstract
Acute rheumatic fever (ARF) is a delayed immunologically mediated sequela of throat infection by group A β-hemolytic streptococci. Inflammatory cytokines may play a pathogenic role in ARF. The objective of this study was to investigate the potential associations between interferon (IFN)-γ, interleukin (IL)-6, tumor necrosis factor (TNF)-α, transforming growth factor (TGF)-β1, and IL-10 gene polymorphisms and childhood ARF. Thirty-eight ARF patients and 40 age- and sex-matched healthy controls were analyzed for eight polymorphisms in five different cytokine genes [IFN-γ (+874), IL-6 (−174), TNF-α (−308), TGF-β1 (+10, +25), and IL-10 (−1082, −819, −592)]. Cytokine genotyping was performed by polymerase chain reaction sequence-specific primer methods. Patients with ARF had significantly higher frequencies of IFN-γ (+874) polymorphism in both TT genotype (p = 0.0002) and T allele (p = 0.0004). No statistically significant differences were observed in genotypes, haplotypes, and allele frequencies of IL-6, TNF-α, TGF-β1, and IL-10 genes between ARF and control groups (p > 0.05). GG genotype frequency of TNF-α gene (low expression) was higher in patients who had previous ARF history (p = 0.006). High expression of TGF-β1 (TT/GG, TC/GG) was more frequent in patients with CRP positivity (p = 0.034). IL-6 CC genotype (low expression) frequency was higher in patients with tricuspid valve insufficiency (p = 0.002), while IFN-γ TT genotype (high expression) frequency was higher in patients with mitral valve prolapse (p = 0.049). Conclusion: High expression of the IFN-γ gene may carry a higher risk for ARF in Turkish children, while IL-6, TNF-α, and TGF-β1 may have an impact in mediating some clinical and laboratory manifestations of the disease.
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Col-Araz, N., Pehlivan, S., Baspinar, O. et al. Role of cytokine gene (IFN-γ, TNF-α, TGF-β1, IL-6, and IL-10) polymorphisms in pathogenesis of acute rheumatic fever in Turkish children. Eur J Pediatr 171, 1103–1108 (2012). https://doi.org/10.1007/s00431-012-1689-5
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DOI: https://doi.org/10.1007/s00431-012-1689-5