RORC gene polymorphism is associated with acute kidney injury following cardiac surgery.

Background Acute kidney injury (AKI) is a common complication of cardiopulmonary bypass (CPB), associated with increased mortality in surgical patients. It is well proven that Th17 and its hallmark cytokine, IL-17, contribute to AKI development. Since the RAR-related orphan receptor C (RORC) gene is a master regulator of the Th17 differentiation, we aimed to evaluate the association between its polymorphisms, CPB-AKI and plasma IL-17 levels among Iranian patients undergoing cardiopulmonary bypass. Method Totally, 138 patients undergoing cardiopulmonary bypass in Bandar Abbas, Iran, were enrolled. The allele and genotype frequencies of the selected SNPs were determined using PCR-SSP. IL-17 serum level was determined using an enzyme-linked immunosorbent assay. Results Rs9017 GG genotype and G allele were associated with increased risk of CPB-AKI (OR=3, 95% CI=1.4-6.6 and OR=2.3, 95% CI=1.3-3.9 respectively) while A allele was protective against the disease (OR=0.4, 95% CI=0.3-0.7, P=0.02). There was not a statistically significant interaction between the three genotypes of rs9017 and AKI disease with IL-17 serum level before (P=0.9) and after (P=0.6) the operation. The IL-17 serum level before surgery was significantly higher in patients carrying GG genotype compared to GA genotype (P=0.017). Conclusion Our results showed that the rs9017 GG genotype was associated with an increased level of IL-17 and risk of CBP-AKI in the Iranian population. Our current results suggest that the rs9017 GG genotype could be a probable predictor of AKI after cardiac surgery.