Salivary chromogranin A and myeloid-related protein-8/14 from periodontitis patients with type 2 diabetes

Objectives: The bidirectional relationship between diabetes mellitus and chronic periodontitis is well known from clinical trials. Periodontitis in diabetic patients is characterized by severe inflammation and tissue destruction. The purpose of this study was to investigate the levels of chromogranin A (CgA), a stress marker, and myeloid-related protein (MRP)-8/14, an inflammatory marker, in saliva from patients with periodontitis and diabetes mellitus, and to investigate the relationship between CgA and MRP-8/14 in all individuals and in the three groups separately. Method and materials: Stimulated saliva was collected from 20 diabetic patients with chronic periodontitis, 16 patients with chronic periodontitis, and 21 healthy individuals. Salivary CgA and MRP-8/14 were determined with enzyme-linked immunosorbent assay. Salivary CgA and MRP-8/14 levels were assessed in the saliva of diabetic periodontitis and periodontitis patients, and the relationship with periodontal disease severity was investigated. Results: CgA values in saliva samples from chronic periodontitis patients and diabetic patients with chronic periodontitis were significantly higher than those of the control group. MRP-8/14 values in saliva from chronic periodontitis patients and diabetic patients with chronic periodontitis was significantly higher than that in the control group. Salivary CgA level was positively correlated to MRP-8/14 in all individuals, but there was no significant correlation within the chronic periodontitis patient group, diabetic patients with chronic periodontitis group, and the healthy patient group. No significant correlation between salivary CgA/MRP-8/14 and clinical parameters of periodontitis was found in the three groups. Conclusions: The results suggest that salivary CgA and MRP-8/14 could be related to the pathogenesis of periodontitis and diabetes. CgA concentration in saliva was positively associated with increased MRP-8/14 in all individuals. Keywords: chromogranin A, diabetes, MRP-8/14 (myeloid-related protein-8/14), periodontitis, saliva