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1.陆军军医大学(第三军医大学)第二附属医院骨科,重庆
2.中国人民解放军总医院第九医疗中心脊柱外科,北京
初同伟,E-mail:chtw@sina.com
收稿日期:2025-02-17,
修回日期:2025-03-02,
纸质出版日期:2025-04-30
移动端阅览
李松涛,孙靖,初同伟.RANKL通过ROS介导HIF-1α下调促进自噬和破骨细胞分化[J].陆军军医大学学报,2025,47(08):816-825.
LI Songtao,SUN Jing,CHU Tongwei.RANKL drives autophagy and osteoclast differentiation via ROS-mediated HIF-1α down-regulation[J].J Army Med Univ,2025,47(08):816-825.
李松涛,孙靖,初同伟.RANKL通过ROS介导HIF-1α下调促进自噬和破骨细胞分化[J].陆军军医大学学报,2025,47(08):816-825. DOI:10.16016/j.2097-0927.202502048.
LI Songtao,SUN Jing,CHU Tongwei.RANKL drives autophagy and osteoclast differentiation via ROS-mediated HIF-1α down-regulation[J].J Army Med Univ,2025,47(08):816-825. DOI:10.16016/j.2097-0927.202502048.
目的
2
探究核因子κB受体活化因子配体(receptor activator of nuclear factor-κB ligand, RANKL)通过ROS-HIF-1α信号轴调控自噬和破骨细胞分化的分子机制。
方法
2
以RAW264.7小鼠单核/巨噬细胞系为模型,采用随机数字表法将细胞分为Control组、RANKL组及联合干预组[RANKL+CQ组(自噬抑制剂干预)、RANKL+FG-4592组(HIF-1α稳定剂干预)、RANKL+NAC组(ROS清除剂干预)]。通过抗酒石酸酸性磷酸酶(TRAP)染色定量检测成熟多核破骨细胞数量;Western blot检测HIF-1α、LC3蛋白表达水平;qRT-PCR分析破骨细胞分化相关基因(
TRAP、Cath K
和
MMP-9
)mRNA表达水平;基于腺病毒mRFP-GFP-LC3标记系统结合激光共聚焦显微镜观察自噬通量活性;DCFH-DA探针检测细胞内活性氧(ROS)水平。
结果
2
与Control组相比,RANKL组中TRAP阳性多核破骨细胞数量显著增加(
P
<
0.05),破骨细胞分化相关基因mRNA表达水平明显上调;同时激活自噬通路,表现为LC3-Ⅱ/LC3-Ⅰ比值升高(
P
<
0.05)及自噬溶酶体数量增加(
P
<
0.05);细胞内ROS水平显著升高(
P
<
0.05),且HIF-1α蛋白表达下调(
P
<
0.05)。与RANKL组比较,RANKL+NAC组显著抑制细胞内ROS蓄积(
P
<
0.05),并逆转HIF-1α蛋白的低表达(
P
<
0.05);同时降低LC3-Ⅱ/LC3-Ⅰ比值(
P
<
0.05)及自噬通量活性(
P
<
0.05);伴随破骨细胞分化相关基因表达水平下降(
P
<
0.05)及成熟破骨细胞数量减少(
P
<
0.05)。与RANKL组比较,RANKL+FG-4592组明显提升HIF-1α蛋白表达水平(
P
<
0.05);同时抑制自噬激活[LC3-Ⅱ/LC3-Ⅰ比值降低(
P
<
0.05);自噬通量活性减少(
P
<
0.05)],进而减少破骨细胞分化相关基因表达(
P
<
0.05)及成熟破骨细胞数量(
P
<
0.05)。与RANKL组比较,RANKL+CQ组显著抑制自噬通量活性(
P
<
0.05);同时明显减少破骨细胞分化相关基因表达水平(
P
<
0.05)及成熟破骨细胞数量(
P
<
0.05)。
结论
2
RANKL通过ROS介导的HIF-1α下调激活自噬,促进破骨细胞分化。
Ob
jective To investigate the molecular mechanism by which receptor activator of nuclear factor-κB ligand (RANKL) regulates autophagy and osteoclast differentiation through the ROS-HIF-1α signaling axis. Methods Mouse monocytic/macrophage RAW264.7 cells were randomly divided into control group
RANKL group
and 3 combined intervention groups
that is
RANKL+CQ group (intervention with autophagy inhibitor
CQ)
RANKL+FG-4592 group (intervention with HIF-1α stabilizer
FG-4592)
and RANKL+NAC group (intervention with ROS scavenger
NAC). The number of mature multinucleated osteoclasts was quantitatively detected with tartrate-resistant acid phosphatase (TRAP) staining; the protein levels of HIF-1α and LC3 were detected by Western blotting and the mRNA levels of osteoclast differentiation-related genes (
TRAP
Cath K
and
MMP-9
) were analyzed by qRT-PCR; autophagy flux and activity were observed by adenovirus mRFP-GFP-LC3 labeling system combined with confocal laser microscopy; and the production of intracellular reactive oxygen species (ROS) was measured by DCFH-DA probe. Results Compared with the control group
the RANKL group obtained significantly increased number of TRAP-positive multinucleated osteoclasts (
P
<
0.05)
up-regulated mRNA levels of osteoclast differentiation-related genes
activated autophagy pathway
as evidenced by the increased LC3-Ⅱ/LC3-Ⅰ ratio (
P
<
0.05) and number of autophagic lysosomes (
P
<
0.05)
elevated intracellular ROS generation (
P
<
0.05)
and down-regulated HIF-1α protein level (
P
<
0.05). NAC intervention significantly inhibited intracellular ROS accumulation (
P
<
0.05)
reversed the lowered expression of HIF-1α protein (
P
<
0.05)
decreased the LC3-Ⅱ/LC3-Ⅰ ratio (
P
<
0.05) and autophagy flux and activity (
P
<
0.05)
and reduced expression levels of osteoclast differenti
ation-related genes and the number of mature osteoclasts (
P
<
0.05). In the RANKL+FG-4592 group
HIF-1α protein level was significantly increased (
P
<
0.05)
autophagy activation was inhibited [with decreased LC3-Ⅱ/LC3-Ⅰ ratio (
P
<
0.05) and autophagy flux and activity (
P
<
0.05)
]
and the expression of osteoclast differentiation-related genes and number of mature osteoclasts were decreased (
P
<
0.05) when compared with the RANKL group. While CQ treatment resulted in inhibited autophagy flux and activity (
P
<
0.05)
declined expression levels of osteoclast differentiation-related genes
and reduced number of mature osteoclasts (
P
<
0.05). Conclusion RANKL activates autophagy through ROS-mediated down-regulation of HIF-1α
and thereby promotes osteoclast differentiation.
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