Evaluation of salivary interleukin‐17 and developmental endothelial locus‐1 in patients with periodontitis with and without type 2 diabetes mellitus

Periodontitis and type 2 diabetes mellitus (T2DM) are two common diseases all over the world, some inflammatory mediators (interleukin 17 [IL-17] and developmental endothelial locus-1 [Del-1]) regulate neutrophil production, recruitment and clearance when the body becomes infected and believed to be involved in the progress of diseases of periodontitis and diabetes. In this study, we enrolled healthy subjects, patients with periodontitis, patients with periodontitis and diabetes. We performed dental examinations and evaluated their blood glucose levels, collected their saliva, and detected IL-17 and Del-1 levels in their saliva. We found both patients with periodontitis and patients with periodontitis and diabetes showed higher IL-17 levels and lower Del-1 levels compared with healthy subjects. Patients with periodontitis and diabetes showed higher IL-17 levels and lower Del-1 levels compared with patients with periodontitis. Salivary IL-17 and Del-1 levels were both correlated with dental examination results and blood glucose levels, and salivary IL-17 and Del-1 displayed an inverse relationship.