Cytokine Profiles as Molecular Markers Associated with Physical Exercise and Insulin Therapy in Patients with Type 2 Diabetes Mellitus

Background: Type 2 diabetes mellitus is characterized by chronic low-grade inflammation, immune dysregulation, and metabolic impairment. This study investigated cytokine profiles associated with physical exercise and insulin therapy in patients with Type 2 diabetes mellitus. Methods: Blood samples were collected from 51 volunteers to evaluate metabolic parameters and cytokine concentrations. According to glycemic status and insulin use, participants were classified into non-diabetic, non-insulin-dependent Type 2 Diabetes Mellitus, and insulin-dependent Type 2 Diabetes Mellitus groups. Results: Physically active individuals with non-insulin-dependent Type 2 Diabetes Mellitus exhibited increased IL-4, IL-6, and IL-10 levels, suggesting enhanced immunoregulatory and anti-inflammatory responses. Physically active patients with insulin-dependent Type 2 Diabetes Mellitus showed elevated IL-17 concentrations. In contrast, sedentary individuals with insulin-dependent Type 2 Diabetes Mellitus exhibited higher TNF-α levels, indicating a more pronounced proinflammatory profile. IFN-γ concentrations were significantly higher in patients with insulin-dependent Type 2 Diabetes Mellitus, regardless of exercise status. Correlation analyses demonstrated distinct cytokinemetabolic interaction patterns according to metabolic condition and physical exercise. Conclusion: Cytokines can serve as molecular markers of immunometabolic responses associated with physical exercise and insulin therapy in Type 2 Diabetes Mellitus, reflecting alterations in systemic inflammatory regulation and immune–metabolic crosstalk related to glycemic adaptation.