Association of xanthine oxidoreductase inhibitor use with insulin secretory capacity in patients with type 2 diabetes

ABSTRACT Aim/Introduction Xanthine oxidoreductase (XOR) inhibitor treatment, which reduces reactive oxygen species (ROS) production and increases adenosine triphosphate (ATP) synthesis, has been reported to improve glycemic control. The possible protective effects of XOR inhibitor treatment on insulin secretory capacity were investigated in patients with type 2 diabetes. Materials and Methods This retrospective cross‐sectional study included 428 patients with type 2 diabetes. Insulin secretory capacity was assessed based on fasting serum C‐peptide concentration (CPR) and C‐peptide index (CPI) in all subjects, while insulin resistance in non‐insulin users (n = 312) was determined using the homeostasis model assessment of insulin resistance (HOMA‐IR) index. Results Median values for CPR and CPI in all subjects were 2.4 ng/mL and 1.5, respectively, while that for HOMA‐IR in non‐insulin users was 3.2. The XOR inhibitor users (n = 72) had significantly (P 6.0 mg/dL) uric acid levels (P for interaction