Abstract
The study aims to explore the role of the ERK signaling pathway in the crosstalk between Dkk-1 and TNF-α in MC3T3E1 pre-osteoblasts under cyclic tensile/compressive stress. A forced four-point bending system was used to apply cyclic uniaxial tensile/compressive strain (2000 μ, 0.5 Hz) to MC3T3E1 cells. Dkk-1 and TNF-α expression were upregulated in MC3T3E1 cells under compressive strain. Cell proliferation, the cell cycle, osteogenesis-related gene (Wnt5a, Runx2, Osterix) expression, β-catenin expression, and the p-ERK/ERK ratio were significantly enhanced, whereas apoptosis, the RANKL/OPG ratio, and TNF-α expression were significantly attenuated, by Dkk-1 silencing. Dkk-1 expression increased and the effects of Dkk-1 silencing were reversed when exogenous TNF-α was added. Mechanically, TNF-α crosstalked with Dkk-1 through ERK signaling in MC3T3E1 cells. ERK signaling blockade impaired Dkk-1-induced TNF-α expression and TNF-α-mediated Dkk-1 expression. Dkk-1 and TNF-α crosstalked, partially through ERK signaling, in MC3T3E1 cells under compressive/tensile strain, synergistically modulating various biological behaviors of the cells. These findings not only provide mechanical insight into the cellular events and molecular regulation of orthodontic tooth movement (OTM), but also aid the development of novel strategies to accelerate OTM.
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Data Availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
Abbreviations
- OTM:
-
Orthodontic tooth movement
- Dkk-1:
-
Dickkopf-related protein 1
- RANKL:
-
Nuclear factor-κB ligand
- OPG:
-
Osteoprotegerin
- TNF:
-
Tumor necrosis factor
- ERK:
-
Extracellular-regulated protein kinase
- MSCs:
-
Mesenchymal stem cells
- ATCC:
-
American Typical Culture Collection
- α-MEM:
-
α -Modified Eagle’s medium (
- FBS:
-
Fetal bovine serum
- siRNAs:
-
Small interfering RNAs
- RT-PCR:
-
Reverse-transcription polymerase chain reaction
- FITC:
-
Fluorescein isothiocyanate
- DAPI:
-
4′,6-Diamidino-2-phenylindole
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Acknowledgements
This work was supported by grants from the National Nature Science Foundation of China (Nos. 81973684, 81500818, 81873334, and 82174358).
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This work was supported by grants from the National Nature Science Foundation of China (Nos. 81973684, 82174358 and 81873334).
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YW: conceptualization, investigation, methodology, and writing of original draft. ZJ: investigation, methodology, and writing of original draft. DD: investigation, methodology, and writing of original draft. JY: investigation, methodology, and writing of original draft. ML: conceptualization, project administration, and writing – review & editing. LL: conceptualization, project administration, and writing – review & editing. YZ: methodology and visualization. WW: visualization, funding acquisition, project administration, and supervision. QH: funding acquisition, project administration, and supervision. YX: funding acquisition, project administration, and supervision.
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Wu, Y., Jing, Z., Deng, D. et al. Dkk-1–TNF-α crosstalk regulates MC3T3E1 pre-osteoblast proliferation and differentiation under mechanical stress through the ERK signaling pathway. Mol Cell Biochem 478, 2191–2206 (2023). https://doi.org/10.1007/s11010-022-04645-4
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DOI: https://doi.org/10.1007/s11010-022-04645-4