Introduction: Saliva is a clinically informative biological fluid that contains many biomarkers, allowing multiple analyses to be performed. Aim: The objectives of this study were the assessment of the serum and saliva levels of biochemical parameters and intensity of free radical processes in T2DM patients and the identification of the correlation between certain criteria. Methods: This case-control study included 40 T2DM patients, which were compared with 40 healthy individuals. The levels of glucose, cholesterol triglycerides, total protein, diene conjugates, and chaperone activity were measured using the spectrophotometric method. The concentration of 8-oxo-2'-deoxyguanosine was assessed by competitive enzyme-linked immunosorbent assay. Results: It was established that the progression of diabetes led to an increase in glucose in saliva. The content of 8-oxo-2'-deoxyguanosine and conjugated dienes increased in serum and this increase was associated with the level of glucose and glycated hemoglobin. The level of protein and chaperone activity increased in the saliva of patients with T2DM compared with the control. The correlation analysis revealed a relationship between total protein concentration and conjugated dienes and between chaperone activity and conjugated dienes in saliva. Conclusions: According to the results of the analysis, the pathological changes in DM affected the salivary glands and their secretions. The obtained results allowed us to recommend using saliva as an alternative to blood for the diagnosis and monitoring of T2DM treatments since it is readily available and quickly responds to changes in metabolism in the body.

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This work is licensed under a Creative Commons Attribution 4.0 License.