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RANKL expression is mediated by p38 MAPK in rat periodontal ligament cells  

Kim, Chong-Cheol (Dept. of Periodontology, College of Dentistry and Dental science research institute, Chonnam National University)
Kim, Young-Joon (Dept. of Periodontology, College of Dentistry and Dental science research institute, Chonnam National University)
Chung, Hyun-Ju (Dept. of Periodontology, College of Dentistry and Dental science research institute, Chonnam National University)
Kim, Ok-Su (Dept. of Periodontology, College of Dentistry and Dental science research institute, Chonnam National University)
Publication Information
Journal of Periodontal and Implant Science / v.34, no.3, 2004 , pp. 489-498 More about this Journal
Abstract
Recent studies have demonstrated that human periodontal ligament cells express receptor activation of nuclear factor ${\kappa}B$ ligand (RANKL) which enhances the bone resorbing activity of osteoclasts differentiated from hematopoietic preosteoclasts. The purpose of this study is to determine the effects of p38 MAPK and JNK kinase upon regulating RANKL and OPG in response to $IL-1{\beta}$(l ng/ml) in rat periodontal ligament cells. Soluble RANKL was measured by immunoassay. The effects of p38 MAPK on RANKL and OPG expression was determined by RT-PCR. The results were as follows: 1. Periodontal ligament cells which stimulated by $IL-1{\beta}$ increased soluble RANKL synthesis by dose-dependent pattern. 2. p38 MAP kinase inhibitor (SB203580) showed regulation of soluble RANKL expression by dose-dependent manners. 3. p38 MAP kinase inhibitor (SB203580) regulated the expression of RANKL, but it dose regulate the expresseion of OPG. 4. JNK (c-jun $NH_2-terminal$ kinase) inhibitor (PD98059) did not regulate mRANKL and mOPG. These results suggested that p38 MAPK play a significant role in RANKL gene expression.
Keywords
RANKL; OPG; p38 MAPK; periodontal ligament cell; RT-PCR;
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