THE INHIBITORY EFFECT OF TAURINE AND ALENDRONATE ON THE OSTEOCLAST DIFFERENTIATION MEDIATED BY SONICATED EXTRACTS OF PORPHYROMONAS GINGIVALIS IN VITRO.

The objective of this study was to investigate the inhibitory effect of taurine and alendronate on the osteoclast differentiation. Osteoblasts and bone marrow cells from 1-2 day old mouse were co-cultured in 10% fetal bovine serum - minimal essential media (FBS-MEM). Osteoclast differentiation was induced by adding the sonicated extracts of Porphyromonas gingivalis (P.gingivalis). Osteoclasts were identified using tartrate resistant acid phosphotase staining (TRAP). Alendronate of 10, 10, 10M and taurine of 500, 1000, 1500/ml were added respectively. The cytotoxic effects of alendronate and taurine were examined using MTT(3-(4,5-dimethylthiazol -2-yl-2,5-diphenyltetrazo- lium bromide) method. After culturing with the sonicated extracts of P.gingivalis, the amounts of IL-6 in the culture supernatant were measured and compared using the ELISA method. The results were as follows : 1. Osteoclasts were differentiated at the concentration of 0.01~0.1/ml sonicated extracts of P.gingivalis. (P M when the concentration of sonicated extracts of P.gingivalis was 0.01/ml. 3. Taurine inhibited osteoclasts differentiation at the concentration of 1500/ml when the concentration of sonicated extracts of P.gingivalis 0.01/ml. 4. In cytotoxic test (MTT test), no cytotoxic effect was evident in all concentrations of alendronate and taurine. 5. Taurine (10M) and alendronate(1500/ml) did not change the amounts of IL-6 induced by sonicated extracts of P.gingivalis significantly.

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