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백서 치주인대세포의 분화에 대한 Bone morphogenetic protein-7의 영향

Effect of BMP-7 on osteoblastic differentiation of rat periodontal ligament cells

김영준|정현주|이호재
대한치주과학회 (The Korean Academy Of Periodontology)|2005.09|Journal of Periodontal & Implant Science|제35권 제3호|pp. 747-760

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참고문헌

주제분류치의학

초록

Abstract

Periodontal therapy has dealt primarily with attempts at arresting progression of disease, however, more recent techniques have focused on regenerating the periodontal ligament having the capacity to regenerate the periodontium. Recombinant human bone morphogenetic protein-7(rhBMP-7) can differentiate the osteoprogenitor cells and induce bone formation. The purpose of this study was to evaluate the effect of BMP-7 on rat periodontal ligament cells differentiation, in vitro. In the control group, cells was cultured with DMEM media. In the experimental groups, cells were cultured with rhBMP-7 in concentration of 10, 25, 50 and 100 ng/㎖. Each group was characterized by examining alkaline phosphatase activity at 3 and 5 days of culture and the ability to produce mineralized nodules of rat calvarial cells at 14 days of culture. Synthesis of type I collagen(COL-I), osteocalcin(OCN), and bone sialoprotein (BSP) was evaluated by RT-PCR at 7 days of culture. Activation of Smad proteins and p38 MAP kinase was determined by western blot analysis of the cell lysates. Alkaline phosphatase activity was significantly increased in the concentration of BMP-7 50 ng/ml and 100 ng/㎖ compared to the control(p<0.05). The mineralized bone nodule formation was greater with addition of 50 ng/㎖ and 100 ng/㎖ BMP-7 than the control(p<0.01). In 7 days' culture, the expressions of COL-1, BSP, and OCN was increased by BMP-7 in concentration of 10 ng/㎖～100 ng/㎖. In western blot analysis, BMP-7 treated culture cells expressed Smad 1,5,8 in dose-dependent manner, whereas BMP-7 did not activate phosphorylated form of p38 MAP kinase. These result suggested that BMP-7 stimulate rat periodontal ligament cells to differentiate toward osteoblast phenotype and increase bone matrix production by activation of BMP-Smad pathway.

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