Secretory phospholipase-A2 and fatty acid composition in oral reactive lesions: a cross-sectional study

Abstract

Background: Oral reactive lesions are the most common lesions of oral cavity. Phospholipases and fatty acids play key roles in the creation of inflammation by change in metabolic activities and production of lipid mediators. The aim of this study was to investigate the amount of secretory phospholipase-A2 (sPLA2) and difference of fatty acid pattern in oral reactive hyperplasia and adjacent normal appearing tissues in patients with oral reactive lesions. Methods: Paired samples of oral hyperplastic (OH) and adjacent normal-appearing tissue of 45 patients were investigated in this study. The collected samples were analyzed with enzymatic spectrophotometric method in terms of the amount of sPLA2 and composition of fatty acids by gas-liquid chromatography method. Results: The amount of sPLA2 (1.8-fold, p < 0.001), stearic acid (1.2-fold, p < 0.001), oleic acid (1.1-fold, p = 0.01), arachidonic acid (1.5-fold, p < 0.001) and docosahexaenoic acid (1.3-fold, p = 0.02) were increased, while the amount of palmitoleic acid (-45%, p < 0.001) and linoleic acid (-19%, p < 0.001) were reduced in the OH tissue samples. Furthermore, the results demonstrated significant associations between the type and location of tissue samples with monounsaturated fatty acids (MUFAs) and n-3 polyunsaturated fatty acids. Tissue samples from patients with inflammatory fibroepithelial hyperplasia showed relatively higher MUFAs and lower n-3 polyunsaturated fatty acids than other type of lesions. Conclusions: Localized changes in the sPLA2 activity and composition of fatty acid are associated with oral reactive hyperplasia and the type of pathological response. We suggest that sPLA2 activity and multiple type of fatty acids might be used as potential therapeutic target for oral reactive hyperplasia.