天津医药 ›› 2023, Vol. 51 ›› Issue (10): 1090-1097.doi: 10.11958/20221976

• 实验研究 • 上一篇    下一篇

大黄素对膝骨关节炎大鼠软骨细胞铁死亡的影响及机制研究

王柯1(), 叶寒露2,()   

  1. 1.武汉市中医医院骨伤科(邮编430014)
    2.内分泌科
  • 收稿日期:2022-12-02 修回日期:2023-02-17 出版日期:2023-10-15 发布日期:2023-10-18
  • 通讯作者: E-mail:jueax516@163.com
  • 作者简介:王柯(1981),男,主治医师,主要从事膝关节骨性关节炎临床研究。E-mail:emf3q7@sina.com
  • 基金资助:
    武汉市中医药科研项目(wz22c62)

Effect and its mechanism of emodin on the ferroptosis of chondrocytes in rats with knee osteoarthritis

WANG Ke1(), YE Hanlu2,()   

  1. 2. Department of Orthopedics and Traumatology
    2. Department of Endocrinology, Wuhan Hospital of Traditional Chinese Medicine, Wuhan 430014, China
  • Received:2022-12-02 Revised:2023-02-17 Published:2023-10-15 Online:2023-10-18
  • Contact: E-mail:jueax516@163.com

摘要:

目的 探讨大黄素对膝骨关节炎(KOA)大鼠软骨细胞铁死亡的影响及其机制。方法 96只SD大鼠分为假手术(Sham)组、KOA组、大黄素(EMO)组、大黄素+Nrf2抑制剂(EMO+ML385)组,每组24只,除Sham组外,其余组均采用改良Hulth法构建KOA模型。酶联免疫吸附试验(ELISA)检测血清肿瘤坏死因子-α(TNF-α)、一氧化氮(NO)、前列腺素E2(PGE2)水平;肉眼观察膝关节大体形态;番红O-固绿染色观察膝关节软骨组织病理形态学;原位末端标记(TUNEL)染色检测膝关节软骨细胞凋亡率;生化试剂盒检测膝关节软骨组织中丙二醛(MDA)、活性氧(ROS)、谷胱甘肽(GSH)、亚铁离子(Fe2+)水平;实时荧光定量PCR(qRT-PCR)、蛋白免疫印迹或免疫组化检测膝关节软骨组织中基质金属蛋白酶(MMP)-3、MMP-13、Ⅱ型胶原α1(COL2A1)、前列腺素内过氧化物合酶2(PTGS2)、谷胱甘肽过氧化物酶4(GPX4)、长链脂酰辅酶A合成酶4(ACSL4)、核因子E2相关因子2(Nrf2)、血红素加氧酶-1(HO-1)mRNA或蛋白表达。结果 与Sham组比较,KOA组大鼠血清TNF-α、NO、PGE2水平,膝关节软骨组织国际骨关节炎研究协会(OARSI)评分,细胞凋亡率,MMP-3、MMP-13、PTGS2 mRNA和蛋白表达,MDA、ROS、Fe2+水平,ACSL4阳性细胞比例和ACSL4、胞核Nrf2、HO-1蛋白表达升高,GSH水平、COL2A1 mRNA和蛋白表达、GPX4阳性细胞比例和GPX4、胞质Nrf2蛋白表达降低(P<0.05),关节软骨明显破坏。EMO可改善KOA大鼠炎症反应、膝关节软骨组织损伤和软骨细胞铁死亡,同时进一步激活Nrf2/HO-1信号通路,而ML385不仅抑制Nrf2/HO-1信号通路激活,还可减弱EMO对KOA大鼠膝关节软骨组织损伤和软骨细胞铁死亡的改善作用。结论 大黄素可激活Nrf2/HO-1信号通路,抑制KOA大鼠软骨细胞铁死亡,保护膝关节软骨。

关键词: 大黄素, 骨关节炎, 膝, 关节炎, 实验性, 软骨细胞, 铁死亡, Nrf2/HO-1信号通路

Abstract:

Objective To investigate the effect and its mechanism of emodin on the ferroptosis of chondrocytes in rats with knee osteoarthritis (KOA). Methods A total of 96 SD rats were divided into the sham operation (sham) group, the KOA group, the emodin (EMO) group and the emodin+Nrf2 inhibitor (EMO+ML385) group, with 24 rats in each group. Except for the sham group, KOA rat models were established by modified Hulth method in each group. The tumor necrosis factor-α (TNF-α), nitric oxide (NO) and prostaglandin E2 (PGE2) levels were detected by enzyme-linked immunosorbent assay (ELISA). General morphology of knee joint was observed with naked eyes. The pathological morphology of knee joint cartilage was observed with safranine O-solid green staining. Apoptosis rate of chondrocytes of knee joint was detected by TdT-mediated dUTP nick end labeling (TUNEL) staining. Malondialdehyde (MDA), reactive oxygen species (ROS), glutathione (GSH) and ferrous ion (Fe2+) levels in knee joint cartilage were detected by biochemical reagent kit. Expression levels of matrix metalloproteinase (MMP)-3, MMP-13, collagen type II α1 (COL2A1), prostaglandin-endoperoxide synthase 2 (PTGS2), glutathione peroxidase 4 (GPX4), acyl-CoA synthetase long chain family member 4 (ACSL4), nuclear factor E2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) mRNA or protein in knee joint cartilage were detected by real-time fluorescence quantitative PCR (qRT-PCR), Western blot assay or immunohistochemistry. Results Compared with the sham group, the serum TNF-α, NO and PGE2 levels, Osteoarthritis Research Society International (OARSI) score, apoptosis rate, mRNA expression of MMP-3, MMP-13 and PTGS2, MDA, ROS, and Fe2+ levels, proportion of ACSL4 positive cells, and protein expression of ACSL4, nuclear Nrf2 and HO-1 increased in the KOA group. GSH levels, mRNA expression of COL2A1, proportion of GPX4 positive cells, and protein expression of GPX4 and cytoplasmic Nrf2 decreased (P<0.05). The articular cartilage was obviously damaged. EMO can improve the inflammatory reaction, knee joint cartilage tissue injury and chondrocyte ferroptosis of KOA rats, and further activate Nrf2/HO-1 signal pathway. ML385 not only inhibited the activation of Nrf2/HO-1 signal pathway, but also attenuated the improvement of EMO on knee joint cartilage tissue injury and chondrocyte ferroptosis of KOA rats. Conclusion Emodin can activate Nrf2/HO-1 signal pathway, inhibit chondrocyte ferroptosis and protect knee articular cartilage of KOA rats.

Key words: emodin, osteoarthritis, knee, arthritis, experimental, chondrocytes, ferroptosis, Nrf2/HO-1 signal pathway

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