Open Access Research article

Enamel matrix derivative protein enhances production of matrixmetalloproteinase-2 by osteoblasts

Seiji Goda1*, Hiroshi Inoue2, Osamu Takeuchi3, Yosuke Ujii4, Eisuke Domae1 and Takashi Ikeo1

Author Affiliations

1 Department of Biochemistry, Osaka Dental University, Osaka, Japan

2 Department of Physiology, Osaka Dental University, Osaka, Japan

3 Department of Operative Dentistry, Osaka Dental University, Osaka, Japan

4 Department of Orthodontics, Osaka Dental University, Osaka, Japan

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BMC Oral Health 2014, 14:85  doi:10.1186/1472-6831-14-85

Published: 10 July 2014

Abstract

Background

Matrix metalloproteinases (MMPs) degrade the extracellular matrix (ECM) and regulate remodeling and regeneration of bone. Enamel matrix derivative (EMD) protein has been used clinically for periodontal regeneration, although its molecular mechanisms are not clear. We evaluated the role of matrix metalloproteinases (MMPs) in regulating EMD-dependent degradation of gelatin on oeoblast-like cell line MG63.

Methods

MG-63 cells (osteoblast cell line) were incubated with 100 μg/ml EMD protein in the presence or absence of MMP-2 tissue inhibitor for 20 h followed by incubation on DQ-gelatin-coated plates for 4 h. MG-63 cells (1 × 106) were preincubated with SB203580 for 30 min at 37°C and were then placed in 100 μg/ml EMD protein for 24 h. Conditioned media were collected and detected by Western blot analysis.

Results

EMD protein enhanced cell-mediated degradation of gelatin, which was inhibited by the MMP inhibitor TIMP-2. Furthermore, MMP-2 was produced by MG63 cells in response to EMD protein in a P38 MAPK-dependent manner. In addition, blocking of p38 MAPK activation by SB203580 significantly inhibited generation of the active form of MMP-2.

Conclusion

P38 MAPK pathway promotes expression MMP-2 in EMD activated osteoblasts, which in turn stimulates periodontal regeneration by degrading matrix proteins in periodontal connective tissue.