Abstract
Metastasis suppressor 1 (MTSS1) plays an inhibitory role in tumorigenesis and metastasis of a variety of cancers. To date, the function of MTSS1 in the differentiation of marrow stromal progenitor cells remains to be explored. In the current study, we investigated whether and how MTSS1 has a role in osteoblast differentiation and bone homeostasis. Our data showed that MTSS1 mRNA was upregulated during osteoblast differentiation and downregulated in the osteoblastic lineage cells of ovariectomized and aged mice. Functional studies revealed that MTSS1 promoted the osteogenic differentiation from marrow stromal progenitor cells. Mechanistic explorations uncovered that the inactivation of Src and afterward activation of canonical Wnt signaling were involved in osteoblast differentiation induced by MTSS1. The enhanced osteogenic differentiation induced by MTSS1 overexpression was attenuated when Src was simultaneously overexpressed, and conversely, the inhibition of osteogenic differentiation by MTSS1 siRNA was rescued when the Src inhibitor was supplemented to the culture. Finally, the in vivo transfection of MTSS1 siRNA to the marrow of mice significantly reduced the trabecular bone mass, along with the reduction of trabecular osteoblasts, the accumulation of marrow adipocytes, and the increase of phospho-Src-positive cells on the trabeculae. No change in the number of osteoclasts was observed. This study has unraveled that MTSS1 contributes to osteoblast differentiation and bone homeostasis through regulating Src-Wnt/β-catenin signaling. It also suggests the potential of MTSS1 as a new target for the treatment of osteoporosis.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- ALP:
-
Alkaline phosphatase
- BMP2:
-
Bone morphogenetic protein 2
- BMSCs:
-
Bone marrow mesenchymal stem cells
- C/EBP:
-
CCAAT/enhancer binding protein
- FBS:
-
Fetal bovine serum
- GSK3β:
-
Glycogen synthase kinase 3β
- HRP:
-
Horseradish peroxidase
- LRP6:
-
Low-density lipoprotein receptor-related protein 6
- MTSS1:
-
Metastasis suppressor 1
- OPN:
-
Osteopontin
- PPARγ:
-
Peroxisome proliferator-activated receptor γ
- Quantitative reverse transcription polymerase chain reaction:
-
QRT-PCR
- Runx2:
-
Runt-related transcription factor 2
- siRNA:
-
Small interfering RNA
- TCF7L2:
-
Transcription factor 7-like 2
- TRAP:
-
Tartrate-resistant acid phosphatase
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Acknowledgements
The authors thank the National Natural Science Foundation of China (NSFC) and Natural Science Foundation of Tianjin City for funding.
Funding
This work was funded by National Natural Science Foundation of China (81871741, 82072389, 81972033, and 81972031) and by Natural Science Foundation of Tianjin City (19JCYBJC25400).
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MC, LS, YG, and LT performed the experiments. JZ, EZ, and HY analyzed the data. XL supervised the research. BW designed the study, supervised the research, and wrote the manuscript. All the authors read and approved the final manuscript.
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The animal experiments were carried out following the National Standard of Animal Care and Use Procedures, and was approved by the Animal Ethics Committee of Tianjin Medical University Chu Hsien-I Memorial Hospital.
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Chen, M., Shan, L., Gan, Y. et al. Metastasis suppressor 1 controls osteoblast differentiation and bone homeostasis through regulating Src-Wnt/β-catenin signaling. Cell. Mol. Life Sci. 79, 107 (2022). https://doi.org/10.1007/s00018-022-04147-y
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DOI: https://doi.org/10.1007/s00018-022-04147-y