Circulating Interleukin-22 Is a Biomarker for Newly Diagnosed Type 2 Diabetes Mellitus and Associated with Hypoglycemic Effect of Sitagliptin.

Purpose: Interleukin-22 (IL-22) has been demonstrated to be involved in the regulation of glucose metabolism, insulin resistance and inflammation response, which indicates that IL-22 might be associated with the occurrence and progression of diabetes. This study aimed to assess serum IL-22 levels in participants with type 2 diabetes mellitus (T2DM) and analyze the association between IL-22 levels and T2DM risk.

Methods: Serum IL-22 concentrations of recruited healthy participants (n=48), newly diagnosed T2DM participants (n=46), and T2DM participants receiving placebo (n=7) or dipeptidyl peptidase-4 inhibitors (DPP-4i) sitagliptin monotherapy (n=7) were measured using a commercial enzyme-linked immunosorbent assay (ELISA) kit.