Kaempferol promotes osteogenic differentiation of mouse bone marrow mesenchymal cells under tension stress via the mTORC1 signaling pathway
10.12016/j.issn.2096-1456.2021.04.003
- Author:
CUI Linna
1
,
2
;
JIANG Xiaowen
1
,
3
;
HUANG Huaqing
1
,
4
;
CHEN Jinyong
1
,
2
Author Information
1. 1.Department of Stomatology, The First People&prime
2. s Hospital of Chenzhou City, Institute of Translation Medicine, University of China South 2.School of Stomatology of Southern Medical University
3. s Hospital of Chenzhou City, Institute of Translation Medicine, University of China South 2.School of Stomatology of Southern Medical University
4. s Hospital of Chenzhou City, Institute of Translation Medicine, University of China South 2School of Stomatology of Southern Medical University.
- Publication Type:Journal Article
- Keywords:
bone marrow mesenchymal cells;
mammalian target of rapamycin complex 1;
cyclic uniaxial tension;
distraction osteogenesis;
alkaline phosphatase;
osteocalcin;
runt related transcription factors;
ribosomal protein S6 kinase;
kaempferol
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2021;29(4):234-240
- CountryChina
- Language:Chinese
-
Abstract:
Objective :To investigate the activation of the mammalian target of rapamycin complex 1 (mTORC1) signaling pathway molecules during the process by which kaempferol (Kae) promotes osteogenic differentiation of mouse bone marrow mesenchymal cells (BMMCs) under cyclic and uniaxial tension.
Methods :BMMCs isolated and cultured in vitro were subjected to uniaxial dynamic tension with a 10% shape variable. The appropriate concentration of Kae was selected by cytotoxicity testing. The endogenous mTOR signal was inhibited by pp242. Four hours after traction, alkaline phosphatase (ALP) and osteocalcin (OCN) were detected by chemical colorimetry and ELISA, and the relative concentration of intracellular calcium was detected by flow cytometry. Phosphorylation of mTOR, 4E/BP1, and ribosomal protein S6 kinases (S6K), which are the main molecules of the endogenous mTORC1 signaling pathway, and expression of osteogenic transcription factors (Runx2 and Osterix) were detected by western blotting (WB), and mRNA expression levels of the above factors were detected by qRT-PCR.
Results : The cytotoxicity test showed that 10 μmol/L Kae had little inhibitory effect on cell proliferation but had the strongest osteogenic ability. Four hours after stretching, Kae effectively promoted the osteogenic differentiation of BMMCs. The expression of ALP was （153.04 ± 18.72） U/mg, the expression of OCN was （1.64 ± 0.25） U. The mRNA and protein levels of Runx2 and Osterix were upregulated, and the intracellular calcium content was decreased. The mRNA and protein phosphorylation of mTOR and S6K was upregulated, and the opposite effect was observed with 4E/BP1. After pp242 was added to inhibit mTOR signaling, mTOR and S6K mRNA and protein phosphorylation were downregulated, but 4E/BP1 mRNA and protein phosphorylation was upregulated. The osteogenic differentiation of BMMCs was also significantly inhibited, mRNA and protein expression of Runx2 and Osterix were significantly downregulated, ALP and OCN expression were downregulated, and intracellular calcium content was increased.
Conclusion:Kae promotes osteogenic differentiation of mouse BMMCs under uniaxial dynamic tension through the mTORC1 signaling pathway.
- Full text:山奈酚通过mTORC1信号促进牵张力下小鼠骨髓间充质细胞成骨分化机制研究.pdf
