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High dose of TNF-α suppressed osteogenic differentiation of human dental pulp stem cells by activating the Wnt/β-catenin signaling

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Abstract

Dental pulp stem cells (DPSCs) were a clonogenic, highly proliferative cells capable of self-renewal and multi-lineage differentiation including chondrocytes, adipocytes, neural cells and osteoblasts, which make it an attractive choice for bone regeneration and repair of craniofacial defects. Recent studies showed that tumor necrosis factor α (TNF-α) may affect osteoclastogenesis and bone formation. However, the effect and mechanism of TNF-α on DPSCs is not clear. In this study, we found that low dose TNF-α promoted mineralization and high dose TNF-α suppressed osteogenic differentiation of DPSCs. Levels of ALP, Osteopontin, Osteocalcin, Osterix and Runx2 were up-regulated in DPSCs treated with TNF-α at low concentration, while down-regulated in DPSCs treated with TNF-α at high concentration. Blockade of Wnt/β-catenin signaling reversed the inhibitory effect observed on osteogenic differentiation of DPSCs treated with TNF-α at high concentration. In addition, we did not detect any proliferative effect of TNF-α on DPSCs by cell cycle and cell counts analysis. In summary, our data suggested that high concentration TNF-α suppressed mineralization and mineralization-related gene expressions through the Wnt/β-catenin signaling in DPSCs. Our findings may provide a foundation for autologous transplantation of DPSCs.

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Abbreviations

TNF-α:

Tumor necrosis factor α

DPSCs:

Dental pulp stem cell

MSCs:

Mesenchymal stem cells

ALP:

Alkaline phosphatase

BMP-2:

Bone morphogenic protein 2

DMEM:

Dulbecco modified eagle medium

FBS:

Fetal bovine serum

PFA:

Paraformaldehyde

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The authors deny any conflicts of interest related to this study.

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Correspondence to Guangyun Liu.

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Zhenjie Qin and Zhixiu Fang contributed equally to this work.

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Qin, Z., Fang, Z., Zhao, L. et al. High dose of TNF-α suppressed osteogenic differentiation of human dental pulp stem cells by activating the Wnt/β-catenin signaling. J Mol Hist 46, 409–420 (2015). https://doi.org/10.1007/s10735-015-9630-7

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  • DOI: https://doi.org/10.1007/s10735-015-9630-7

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