Songtao LI, Jing SUN, Wugui CHEN, et al. Hypoxia inhibits osteoclast differentiation by HIF-1α-mediated upregulation of NRP-1[J]. Journal of Third Military Medical University, 2019, 41(11): 1052-1058.
DOI:
Songtao LI, Jing SUN, Wugui CHEN, et al. Hypoxia inhibits osteoclast differentiation by HIF-1α-mediated upregulation of NRP-1[J]. Journal of Third Military Medical University, 2019, 41(11): 1052-1058. DOI: 10.16016/j.1000-5404.201811206.
Hypoxia inhibits osteoclast differentiation by HIF-1α-mediated upregulation of NRP-1
To investigate the regulation effect of hypoxic/HIF-1α pathway on the differentiation of RAW264.7 cells into mature osteoclasts
and to explore the possible molecular mechanism.
Methods
2
RAW264.7 cell lines with stable low expression of HIF-1α and NRP-1 were respectively established by short hairpin RNA (shRNA) lentivirus infection. Then the RAW264.7 cells were cultured in groups
that is
control group
differentiation group [100 ng/mL RANKL+50% osteoblast conditioned medium (CM)
]
hypoxia group (100 ng/mL RANKL+50% osteoblast CM+100 μmol/L CoCl
2
)
hypoxia+HIF-1α-NC group
hypoxia+HIF-1α shRNA group
hypoxia+NRP-1-NC group
and hypoxia+NRP-1-shRNA group. TRAP staining was used to observe osteoclast differentiation. The mRNA expression of Cath K
MMP-9
TRAP
HIF-1α and NRP-1 were detected by RT-PCR. Western blotting was used to detect the expression of HIF-1α and NRP-1
proteins.
Results
2
① The mRNA expression levels of Cath K
MMP-9 and TRAP and the number of TRAP positive cells in the hypoxia groups were significantly lower than those in the differentiation groups (
P
<
0.05). ② The expression levels of HIF-1α and NRP-1 were significantly higher in the hypoxic groups than the differentiation groups (
P
<
0.05). ③ Compared with the hypoxia groups
the number of TRAP positive cells and the expression levels of osteoclast differentiation related genes were significantly increased
while those of HIF-1α and NRP-1 were significantly reduced in the hypoxic+HIF-1α shRNA group (
P
<
0.05). ④ Compared with the hypoxia groups
the number of TRAP positive cells and the expression levels of osteoclast differentiation related genes were significantly increased
while the level of NRP-1 was significantly decreased in the hypoxia+NRP-1-shRNA group (
P
<
0.05).
Conclusion
2
The hypoxia-mediated HIF-1α-dependent up-regulation of NRP-1 inhibits the differentiation of RAW264.7 cells into mature osteoclasts.
关键词
Keywords
references
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