Reparative Dentin Formation by Dentin Matrix Proteins and Small Extracellular Vesicles.

Bo Wen, Yibing Huang, Tao Qiu, Fangjun Huo, Li Xie, Li Liao, Weidong Tian, Weihua Guo

Journal of endodontics 2021 Feb

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Vital pulp therapy aims at preserving pulp vitality and regenerating dentin. Therefore, the purpose of this study was to explore the effects of a combination of treated dentin matrix (TDM) proteins and dental pulp cell (DPC)-derived small extracellular vesicles (sEVs) on pulp-dentin complex repair. We prepared TDM by chemical demineralization and mechanical disruption of teeth to a powder preparation. The sEVs were isolated from culture supernatants of DPCs and identified by nanoparticle tracking analysis, Western blotting, and transmission electron microscopy. The effect of a combination of TDM proteins and DPC-derived sEVs on DPC proliferation, migration, and odontogenic differentiation was evaluated in vitro. A minipig model of pulp injury was used to compare the clinical outcomes and tissue responses attributed to 4 materials including TDM, sEV-TDM, sEVs, and mineral trioxide aggregate. The sEV isolated from the cell supernatant promoted DPC proliferation and migration. The combination of TDM extracts and sEV synergistically promoted the migration of DPCs but suppressed their proliferation. Real-time polymerase chain reaction and Western blot revealed that sEV-TDM enhanced the odontoblast-related protein expressions in DPCs. In in vivo studies, TDM and sEV-TDM promoted the formation of continuous reparative dentin. Furthermore, odontoblastlike high columnar cells were observed on the pulp side of the dentin bridge. The sEV-TDM complex exhibits intrinsic biological activities, which has potential applications as a bioactive pulp-capping material. Copyright © 2020 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

Citation

Bo Wen, Yibing Huang, Tao Qiu, Fangjun Huo, Li Xie, Li Liao, Weidong Tian, Weihua Guo. Reparative Dentin Formation by Dentin Matrix Proteins and Small Extracellular Vesicles. Journal of endodontics. 2021 Feb;47(2):253-262