Bone Morphogenetic Protein-7 Enhances Cementoblast Function In Vitro

作者：Hakki Sema S^*; Foster Brian L; Nagatomo Kanako J; Bozkurt S Buket; Hakki Erdogan E; Somerman Martha J; Nohutcu Rahime M

来源：Journal of Periodontology, 2010, 81(11): 1663-1674.

DOI：10.1902/jop.2010.100074

• Bone morphogenetic protein 7
• collagen
• dental cementum
• extracellular matrix
• matrix metalloproteinases
• regeneration

Background: Bone morphogenetic protein (BMP)-7 is a potent bone-inducing factor and was shown to promote periodontal regeneration in vivo and in vitro; however, to our knowledge, the specific effect of BMP-7 on cementoblasts has not been defined. We aimed to investigate the effects of BMP-7 on cementoblasts, which are cells responsible for tooth root-cementum formation. We hypothesized that BMP-7 would regulate mineralized tissue-associated genes in cementoblasts and influence the expression profile of genes associated with cementoblast extracellular matrix (ECM) and cell adhesion molecules (CAMs).
Methods: A murine immortalized cementoblast cell line (OCCM.30) was cultured with and without 50 ng/ml BMP-7. After 72 hours, total RNA was isolated, and mRNA levels for bone/cementum markers, including bone sialoprotein (BSP), osteocalcin (OCN), osteopontin (OPN), and runt-related transcription factor-2 (Runx2), were investigated by real-time quantitative reverse transcription-polymerase chain reaction (Q-PCR). In vitro mineral nodule formation was assayed on day 8 using von Kossa staining. A pathway-specific gene-expression array was used to determine BMP-7-responsive ECM and CAM genes in cementoblasts.
Results: Mineralized tissue markers were strongly regulated by BMP-7, with an almost three-fold increase in BSP and OCN transcripts and significant increases in OPN and Runx2 mRNA expressions. BMP-7 treatment markedly stimulated cementoblast-mediated biomineralization in vitro compared to untreated cells at day 8. BMP-7 treatment altered the OCCM.30 expression profile for ECM and CAM functional gene groups. BMP-7 tended to increase the expression of collagens and matrix metalloproteinases (MMPs), mildly decreased tissue inhibitors of MMPs (TIMPs), and had mixed regulatory effects on integrins. Using Q-PCR, selected array results were confirmed, including a significant BMP-7-induced increase in MMP-3 and a decrease in TIMP-2 mRNA expression.
Conclusion: These results support the promising applications of BMP-7 in therapies aimed at regenerating periodontal tissues lost as a consequence of disease. J Periodontol 2010;81:1663-1674.

• 出版日期2010-11