Evaluation of the salivary level of Glutathione reductase, Catalase and Free thiol in patients with oral lichen plaus

Abstract

Objective: Oral lichen planus (OLP) is a usual chronic inflammatory disease of the oral mucosa with malignant capacity, whose pathogenesis is not yet well known. Free radicals and reactive oxygen species may have a vital role in the pathogenesis of oral lichen planus. This study aimed to assess Glutathione reductase, catalase, and free thiol levels in the saliva of OLP patients and compare it with healthy people. Methods: In this cross-sectional study, 35 patients with OLP and 20 healthy people were involved. Five mL of whole, unstimulated saliva samples were collected in the morning, and the salivary levels of antioxidants were measured by ELISA technique. In this experiment, sex, age and OLP types were also evaluated. Results: There was a significant decrease in the salivary level of Glutathione reductase and catalase in patients (p=0.001), but there were no differences between the two groups regarding free-thiol level (p=0.7). However, there was no correlation between age and gender with the antioxidants’ contents. There was a significant decrease in glutathione reductase and catalase in the erosive type than in the non-erosive type. Conclusions: In this study, we found that the salivary levels of Glutathione reductase and Catalase were lower in OLP patients than in the healthy group, which means these antioxidants were affected by OLP and also related to the type of it. So salivary Glutathione reductase and Catalase levels may be used as biomarkers for OLP monitoring and treatment.