Effect of mechano-growth factor on osteoclast activity and its mechanism / 中华创伤杂志
Chinese Journal of Trauma
;
(12): 1034-1041, 2021.
Article
in Chinese
| WPRIM
| ID: wpr-909973
ABSTRACT
Objective:
To investigate the effect of mechano-growth factor(MGF)on osteoclast activity and its mechanism.Methods:
The RAW264.7 precursor osteoclast cell line was cultured with 25 ng/ml macrophage-colony stimulating factor(M-CSF)and 30 ng/ml receptor activator of NF-κB ligand(RANKL),and identified by tartrate resistant acid phosphatase(TRAP)staining after 7 days of culture. Western blot anslysis was used to determine the effect of 45 ng/ml MGF on the phosphoinositide-3-kinase/protein kinase B(PI3K/AKT)signaling pathway in separated osteoclasts,including levels of AKT,phosphorylation(p)-AKT,lactation mammalian target of rapamycin(mTOR),p-mTOR and TRAP at 0,4,8 and 12 hours. Real-time fluorescence quantitative PCR was used to expressions of TRAP in osteoclasts at 0,4,8 and 12 hours. The PI3K/Akt phosphorylation inhibitor LY294002(20 μmol/L)combined with MGF(45 ng/ml)was used to act on osteoclasts,and expression levels of Akt,p-Akt,mTOR,p-mTOR and TRAP were detected by Western blot at 0,4,8 and 12 hours.Results:
After culturing RAW264.7 cells with M-CSF and RANKL for 7 days,a large number of osteoclasts with positive TRAP staining can be obtained. Western blot analysis showed expression levels of Akt and mTOR did not change significantly over time( P>0.05),expression levels of p-Akt and p-mTOR increased continuously from(2.18±0.34)pg/ml and(0.83±0.10)pg/ml at 0 hour to(3.86±0.36)pg/ml and(1.56±0.19)pg/ml at 12 hours( P<0.05),and expression level of TRAP decreased significantly over time,from(5.66±0.47)pg/ml at 0 hour to(3.76±0.38)pg/ml at 12 hours( P<0.05). Real-time fluorescence quantitative PCR analysis of expression of TRAP in osteoclasts showed that MGF inhibited the expression of TRAP in osteoclasts,which decreased from 1.02±0.06 at 0 hour to 0.53±0.11 at 12 hours( P<0.05). After acting LY294002 combined with MGF on osteoclasts,Western blot analysis showed expression levels of Akt and mTOR did not change significantly over time( P>0.05),expression levels of p-AKT and p-mTOR decreased significantly from(3.28±0.18)pg/ml and(3.29±0.22)pg/ml at 0 hour to(2.06±0.34)pg/ml and(2.04±0.20)pg/ml at 12 hours( P<0.05),and expression level of TRAP had no significant difference over time( P>0.05).Conclusions:
MGF inhibits osteoclast activity by inhibiting the expression of TRAP in osteoclasts through PI3K/Akt signaling pathway. LY294002 inhibits the expression of PI3K/Akt signaling pathway in osteoclasts,further verifying the mechanism of MGF inhibiting osteoclast activity,and this finding puts forward new ideas for clinical prevention and treatment of osteoporosis.
Full text:
Available
Index:
WPRIM (Western Pacific)
Type of study:
Prognostic study
Language:
Chinese
Journal:
Chinese Journal of Trauma
Year:
2021
Type:
Article
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