Tumor Necrosis Factor (TNF-α) and C-reactive Protein (CRP) are Positively Associated with the Risk of Chronic Kidney Disease in Patients with Type 2 Diabetes

PURPOSE: Chronic low-grade inflammation may induce chronic kidney disease in patients with type 2 diabetes. This study investigated the relation between inflammatory biomarkers and chronic kidney disease in patients with type 2 diabetes, which has not yet been reported in Asian populations. MATERIALS AND METHODS: A cross-sectional study was performed in 543 patients recruited from diabetic clinics for an ongoing, prospective study. Multivariate logistic regression was used to evaluate the association between inflammatory biomarkers and the presence of chronic kidney disease (estimated glomerular filtration rate < 60 mL/min per 1.73 m(2) by the simplified Modification of Diet in Renal Disease equation using plasma creatinine). RESULTS: The risk of chronic kidney disease increased in the highest quartiles of C-reactive protein (CRP) [multivariate odds ratio (OR) = 3.73; 95% CI = 1.19-1.70] and tumor necrosis factor-α (multivariate OR = 4.45; 95% CI = 1.63-12.11) compared to the lowest quartiles after adjustments for age, sex, zinc intake, and other putative risk factors for chronic kidney disease. CONCLUSION: Our results suggest that CRP and tumor necrosis factor-α may be independent risk factors for chronic kidney disease in patients with type 2 diabetes. A causal mechanism of this association should be evaluated in a follow-up study of Korean patients with type 2 diabetes.