Anti-Inflammation of N-Benzyl-4-Bromobenzamide in Lipopolysaccharide-Induced Human Gingival Fibroblasts

Objective: To evaluate the effect of N-benzyl-4-bromobenzamide (NBBA) on lipopolysaccharide (LPS)-induced IL-6 and prostaglandin E-2 (PGE(2)) production in human gingival fibroblasts (HGFs). Material and Methods: The benzamide compound was synthesized. The condition for IL-6 production of HGFs after induction with LPS was optimized. The HGFs were incubated with NBBA (10 mu g/ml) for 30 min before LPS (1 mu g/ml) was added. After 24 h of incubation time, the culture media were harvested and their IL-6 and PGE(2) contents were determined using an enzyme-linked immunosorbent assay. Prednisolone (PDS) and NS-398 were used as positive controls. Statistical analysis of the IL-6 and PGE(2) contents was performed using the ANOVA test followed by the Tukey multiple- comparisons test to compare replicate means. p < 0.001 was considered statistically significant. Results: The maximum IL-6 production was achieved when HGFs were exposed to 1 mu g/ml of LPS for 24 h, which was inhibited by the IL-6 immunosuppressant PDS. The benzamide compound, NBBA, exhibited a potent anti-IL-6 activity with inhibition of 35.6 +/- 0.5%, significantly different from in the LPS-induced HGFs (p < 0.001). In addition, it inhibited 75.6 +/- 0.52% PGE(2) production. Cell viability was not significantly affected by treatment with NBBA at a concentration < 10 mu g/ml (p < 0.001). Conclusions: NBBA exhibited an inhibitory effect on the production of IL-6 and PGE 2 in LPS-induced HGFs. It could serve as a compound with inhibiting inflammatory activity in periodontal disease. (C) 2015 S. Karger AG, Basel