In the present study, we investigated the anti-inflammatory effects of a Kampo medicine Shosaikoto (TJ-9) using in vitro periodontal disease model, in which human gingival fibroblasts (HGFs) treated with lipopolysaccharide (LPS) from Porphyromonas gingivalis (PgLPS) produce IL-6, IL-8 and prostaglandin E2 (PGE2). Treatment with PgLPS (10 ng/ml), TJ-9 (up to 1 mg/ml) and their combinations for 24 h did not affect the viability of HGFs. Moreover, TJ-9 did not alter LPS-induced IL-6 and IL-8 productions. However, TJ-9 significantly suppressed LPS-induced PGE2 production in a dose-dependent manner but TJ-9 alone did not affect basal PGE2 level. Western blotting demonstrated that TJ-9 decreased cyclooxygenase-2 (COX-2) expression in a dose-dependent manner but not phospholipase A2. Moreover, TJ-9 selectively and dose-dependently inhibited COX-2 activity. These results suggest that TJ-9 decreased PGE2 production by inhibition of both COX-2 expression and activity and that TJ-9 may be useful to improve gingival inflammation in periodontal disease.
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