中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (27): 4373-4377.doi: 10.12307/2024.556

• 骨组织构建 bone tissue construction • 上一篇    下一篇

齐墩果酸调节Wnt/β-catenin信号通路减轻大鼠激素性股骨头坏死

龚高进,黄海汛   

  1. 成都医学院第二附属医院•核工业四一六医院脊柱骨科,四川省成都市  610051
  • 收稿日期:2023-10-10 接受日期:2023-11-17 出版日期:2024-09-28 发布日期:2024-01-29
  • 通讯作者: 黄海汛,副主任医师,成都医学院第二附属医院•核工业四一六医院脊柱骨科,四川省成都市 610051
  • 作者简介:龚高进,男,1981年生,四川省成都市人,汉族,2006年四川大学毕业,主治医师,主要从事骨科方向的研究。

Oleanolic acid alleviates steroid-induced osteonecrosis of the femoral head in rats by regulating Wnt/beta-catenin signaling pathway

Gong Gaojin, Huang Haixun   

  1. Department of Spine and Orthopaedics, the Second Affiliated Hospital of Chengdu Medical College•Nuclear Industry 416 Hospital, Chengdu 610051, Sichuan Province, China
  • Received:2023-10-10 Accepted:2023-11-17 Online:2024-09-28 Published:2024-01-29
  • Contact: Huang Haixun, Associate chief physician, Department of Spine and Orthopaedics, the Second Affiliated Hospital of Chengdu Medical College•Nuclear Industry 416 Hospital, Chengdu 610051, Sichuan Province, China
  • About author:Gong Gaojin, Attending physician, Department of Spine and Orthopaedics, the Second Affiliated Hospital of Chengdu Medical College • Nuclear Industry 416 Hospital, Chengdu 610051, Sichuan Province, China

摘要:


文题释义:

齐墩果酸:是从中药中提取的一种五环三萜类化合物,研究表明齐墩果酸具有治疗骨质疏松的作用。
Wnt/β-Catenin 信号通路:可调节干细胞的多能性,并且在发育过程中决定细胞的分化命运。这种发育性级联整合其他通路的信号,包括视黄酸、成纤维细胞生长因子、转化生长因子β和骨形态发生蛋白,存在于各种不同的细胞类型和组织。


背景:齐墩果酸具有促进成骨细胞增殖、抑制破骨细胞增殖,进而改善激素性股骨头坏死的功效,但其具体作用机制尚不完全清楚。

目的:探究齐墩果酸通过调节Wnt/β-catenin信号通路减轻大鼠激素性股骨头坏死的机制。
方法:将40只SD大鼠随机分为对照组、模型组、齐墩果酸组、齐墩果酸+sFRP1组,后3组大鼠注射醋酸泼尼松龙建立大鼠激素性股骨头坏死模型。齐墩果酸组大鼠灌胃10 mg/(kg•d)齐墩果酸并肌肉注射相应生理盐水,齐墩果酸+sFRP1组大鼠灌胃10 mg/(kg•d)的齐墩果酸并肌肉注射1 mg/(kg•d)的Wnt抑制剂sFRP1,对照组和模型组大鼠灌胃和肌肉注射等体积生理盐水,给药6周。检测各组大鼠血清Ca、P、转化生长因子β1及碱性磷酸酶水平;micro-CT检测股骨形态;苏木精-伊红染色观察股骨组织形态;TUNEL检测组织细胞凋亡率;蛋白印迹法检测Bcl-2、Bax、Wnt、β-catenin蛋白水平。

结果与结论:①与对照组相比,模型组大鼠骨小梁、股骨头严重损伤,血清Ca、P、转化生长因子β1水平、骨组织Bcl-2、Wnt、β-catenin蛋白水平显著降低,血清碱性磷酸酶水平、细胞凋亡率、Bax蛋白水平显著升高(P < 0.05);与模型组相比,齐墩果酸组大鼠骨小梁稀疏程度明显改善,股骨头损害程度显著减轻,血清碱性磷酸酶水平、细胞凋亡率、Bax蛋白水平显著降低,血清Ca、P、转化生长因子β1水平、骨组织Bcl-2、Wnt、β-catenin蛋白水平显著升高(P < 0.05);与齐墩果酸组相比,齐墩果酸+sFRP1组大鼠上述指标呈现相反变化(P < 0.05)。②结果说明,齐墩果酸可改善激素性股骨头坏死大鼠的骨代谢指标和骨小梁结构,减轻股骨头坏死,可能是通过激活Wnt/β-catenin信号通路实现的。

https://orcid.org/0009-0005-2397-9068(龚高进)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 齐墩果酸, Wnt, β-catenin, 激素性股骨头坏死, 骨代谢, 信号通路

Abstract: BACKGROUND: Oleanolic acid can promote osteoblast proliferation and inhibit osteoclast proliferation, thereby improving steroid-induced osteonecrosis of the femoral head, but its specific mechanism of action is not yet fully understood.
OBJECTIVE: To explore the mechanism by which oleanolic acid alleviates steroid-induced osteonecrosis of the femoral head in rats by regulating the Wnt/β-catenin signaling pathway. 
METHODS: Forty Sprague-Dawley rats were randomized into control group, model group, oleanolic acid group and oleanolic acid+sFRP1 group. An animal model of steroid-induced osteonecrosis of the femoral head was established by injecting prednisolone acetate in the latter three groups. Rats in the oleanolic acid group were gavaged with 10 mg/kg/d oleanolic acid and intramuscularly injected with the corresponding saline; rats in the oleanolic acid+sFRP1 group were gavaged with 10 mg/kg/d oleanolic acid and intramuscularly injected with 1 mg/kg/d Wnt inhibitor-sFRP1; and rats in the control and model groups were administered by gavage and intramuscularly injected with equal volumes of saline for 6 weeks. The levels of serum calcium, phosphorus, transforming growth factor-β1, and alkaline phosphatase were detected. Micro-CT was applied to detect femoral morphology. The morphology of femoral tissue was detected by hematoxylin-eosin staining. Cell apoptosis was detected by TUNEL. The levels of Bcl-2, Bax, β-catenin, and Wnt proteins were determined by western blot. 
RESULTS AND CONCLUSION: Compared with the control group, the trabeculae bone and femoral head of the model group were seriously injured, the serum levels of calcium, phosphorus, and transforming growth factor-β1 were significantly decreased, the levels of Bcl-2, Wnt, and β-catenin proteins in bone tissue were significantly reduced, and the serum alkaline phosphatase level, cell apoptosis rate, and Bax protein level were significantly increased (P < 0.05). Compared with the model group, the degree of trabecular thinning in the oleanolic acid group was significantly improved, and the degree of femoral head damage was significantly reduced, serum alkaline phosphatase level, cell apoptosis rate, and Bax protein level were significantly reduced, serum levels of calcium, phosphorus, and transforming growth factor-β1, and levels of Bcl-2, Wnt, and β-catenin proteins in bone tissue were significantly increased (P < 0.05). Compared with the oleanolic acid group, the oleanolic acid+sFRP1 group showed opposite changes in the above-mentioned indicators (P < 0.05). To conclude, oleanolic acid can improve bone metabolism indicators and trabecular structure and attenuate femoral head necrosis in rats with steroid-induced osteonecrosis of the femoral head, which can be achieved by activating the Wnt/β-catenin signaling pathway.

Key words: oleanolic acid, Wnt, β-catenin, steroid-induced osteonecrosis of the femoral head, bone metabolism, signaling pathway

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