Soluble LPS receptor CD14 is increased in saliva of patients with geographic tongue

Abstract

Objectives The soluble bacterial pattern recognition receptor, sCD14 augments inflammatory responses in oral cavity. The aim of the study was to investigate whether patients with geographic tongue (GT) with and without fissured tongue (FT) have impaired inflammatory regulation, manifesting as increased levels of sCD14 in the saliva. Material and Methods An enzyme-linked immunosorbent assay was used to measure the amount of sCD14 in whole and parotid saliva of patients diagnosed with GT (GT whole, n = 21; GT parotid, n = 23) and control subjects (GT whole, n = 25; GT parotid, n = 18). The levels of sCD14 were also evaluated according to our previous clinical assessment of GT based on the number of lesions detected on the tongue, as ‘mild’ (a single lesion), ‘moderate’ (2–5 lesions), or ‘severe’ (≥6 lesions). Diagnosis of FT was established when multiple grooves or fissures were observed on the dorsal and lateral surfaces of the tongue. Results GT patients had significantly higher sCD14 levels in whole (p<.05) and parotid saliva (p<.001), compared with controls. GT patients with FT had significantly increased sCD14 levels only in parotid saliva. A gradual increase in sCD14 levels in parotid and unstimulated saliva was seen in GT patients with multiple tongue lesions compared with single lesions. Conclusions GT patients had increased sCD14 in both parotid and unstimulated saliva. sCD14 seems to increase local inflammatory responses, which suggests its involvement in the pathophysiology of GT.