Abstract
To investigate the expression of C-JNK, RANKL and OPG after SP600125 administration in cultured dental follicle cells (DFCs). TRAP staining and electron microscope were carried out on day 7 and 9 after coculture of BMMs and DFCs with a ratio of 5:1 in different groups. To determine the effects of SP600125 on the expression of C-JNK, RANKL and OPG mRNA and protein, cultured DFCs were divided into control group, DMSO group and SP600125 groups. Real-time PCR and Western blot analysis were performed to investigate the expression of the mRNA and protein, respectively. TRAP assay indicated that the number of multinucleated osteoclasts in the SP600125 group showed significant decrease compared with that of control (P < 0.05). The expression of JNK protein in the SP600125 groups showed significant decline compared with that of the control group and blank control (P < 0.05). Significant decrease was noticed in the RANKL protein expression with the elevation of SP600125. SP600125 could inhibit the formation of osteoclast in the coculture system of DFCs and BMMs. After SP600125 treatment, the expression of RANKL and JNK showed a trend of decrease, and the expression of OPG showed gradual increase followed by gradual decrease.
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