Received:23 October 2016,
Published:2017-07
移动端阅览
Wenjuan Zhang, Baoping Xie, Weijuan Li, et al. Inhibitory effect of psoralen on osteoclast formation and its underlying mechanism
Wenjuan Zhang, Baoping Xie, Weijuan Li, et al. Inhibitory effect of psoralen on osteoclast formation and its underlying mechanism
Objective
2
To determine the effect of psoralen on osteoclast differentiation and on the regulation of ER-alpha and IL-17R in the osteoclasts in order to preliminary clarify the anti-osteoporosis effect of psoralen.
Methods
2
In order to induce the differentiation of to osteoclasts
mouse macrophage RAW264.7 cells were divided into 5 groups
and treated respectively with receptor activator for nuclear factor-κB ligand (RANKL)
RANKL+estradiol (positive control)
and RANKL+psoralen at 3 different concentrations (10
5 and 2.5 μmol/L). In 5 d after the treatment
tartrate-resistant acid phosphatase (TRAP) staining and bone resorption essay were used to identify the inhibitory effects of psoralen on the differentiation of osteoclasts. Transcriptional and protein concentration levels of matrix metallopeptidase 9 (MMP-9)
TRAP and Cathepsin K were detected by RT-PCR and ELISA to clarify the activity of osteoclasts
and the expression of IL-17R and estrogen receptor-α (ER-α) was also detected for the role of psoralen in the process.
Results
2
Compared with control cells
high-
middle-and low-dose psoralen significantly inhibited the numbers of osteoclasts and osteoclast-mediated bone resorption
as well as the gene expression of Cathepsin K
TRAP and IL-17R (
P
<
0.05
P
<
0.01)
while markedly enhanced the expression of ER-α (
P
<
0.01). The 3 doses of psoralen also reduced the MMP-9 expression significantly (
P
<
0.05). Compared with the control group
the protein level of Cathepsin K was very significantly decreased in the high-and middle-dose psoralen groups (
P
<
0.01). The treatment of psoralen at 3 doses also markedly reduced the protein contents of TRAP
MMP-9 and IL-17R (
P
<
0.05
P
<
0.01)
and promoted that of ER-α (
P
<
0.01).
Conclusion
2
Psoralen remarkably inhibits the differentiation of osteoclasts and the function of osteolysis at the same time
which might be due to its enhancing the expression of ER and suppressing that of IL-17R.
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