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Abstract
Porphyromonas gingivalis is an oral pathogen with the ability to induce oral dysbiosis and periodontal disease. Nevertheless, the mechanisms by which P. gingivalis could abrogate the host-microbe symbiotic relationship leading to oral dysbiosis remain unclear. We have recently demonstrated that P. gingivalis specifically increased the antimicrobial properties of oral epithelial cells, through a strong induction of the expression of PLA2-IIA in a mechanism that involves activation of the Notch-1 receptor. Moreover, gingival expression of PLA2-IIA was significantly increased during initiation and progression of periodontal disease in non-human primates and interestingly, those PLA2-IIA expression changes were concurrent with oral dysbiosis. In this chapter, we present an innovative hypothesis of a potential mechanism involved in P. gingivalis-induced oral dysbiosis and inflammation based on our previous observations and a robust body of literature that supports the antimicrobial and proinflammatory properties of PLA2-IIA as well as its role in other chronic inflammatory diseases.
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