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武汉市第三医院骨一科,武汉 430060
范明宇,Email:21872407@qq.com,研究方向:骨代谢、椎间盘退变的基础研究。
收稿:2022-12-01,
修回:2023-06-02,
录用:2023-06-23,
纸质出版:2023-07-28
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范明宇,卞峰,周少怀,等.穿心莲内酯对TBHP诱导的椎间盘髓核细胞凋亡的作用及机制研究[J].重庆医科大学学报,2023,48(7):777-783.
Fan Mingyu,Bian Feng,Zhou Shaohuai,et al.Effect of andrographolide on TBHP-induced apoptosis of intervertebral disc nucleus pulposus cells and its mechanism[J].Journal of Chongqing Medical University,2023,48(7):777-783.
范明宇,卞峰,周少怀,等.穿心莲内酯对TBHP诱导的椎间盘髓核细胞凋亡的作用及机制研究[J].重庆医科大学学报,2023,48(7):777-783. DOI: 10.13406/j.cnki.cyxb.003282.
Fan Mingyu,Bian Feng,Zhou Shaohuai,et al.Effect of andrographolide on TBHP-induced apoptosis of intervertebral disc nucleus pulposus cells and its mechanism[J].Journal of Chongqing Medical University,2023,48(7):777-783. DOI: 10.13406/j.cnki.cyxb.003282.
目的
2
探讨穿心莲内酯(andrographolide,ANDRO)对叔丁基过氧化氢(tert-butyl hydroperoxide,TBHP)诱导的椎间盘髓核细胞(nucleus pulposus cells,NPC)凋亡的作用及其机制。
方法
2
用TBHP诱导NPC建立细胞模型。将NPC分为5组:对照组、模型组(100 μmol/L TBHP)、ANDRO低剂量组(100 μmol/L TBHP+9 μmol/L ANDRO)、ANDRO中剂量组(100 μmol/L TBHP+18 μmol/L ANDRO)和ANDRO高剂量组(100 μmol/L TBHP+36 μmol/L ANDRO)。流式细胞术检测细胞凋亡和活性氧(reactive oxygen species,ROS)水平,ELISA试剂盒检测氧化应激相关指标超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-PX)和过氧化氢酶(catalase,CAT)水平,JC-1探针法检测线粒体膜电位,Western blot检测动力相关蛋白1(dynamin-related protein 1,Drp1)、p-Drp1和线粒体融合蛋白2(mitofusin 2,Mfn2)的表达水平。
结果
2
与对照组相比,模型组NPC凋亡率、ROS水平和线粒体膜电位下降细胞比例明显升高(均
P
=0.000),SOD、GSH-PX和CAT水平明显降低(均
P
=0.000),p-Drp1/Drp1水平明显上调(
P
=0.000),Mfn2蛋白表达明显下调(
P
=0.000)。与模型组相比,经ANDRO高剂量干预后,NPC凋亡率[(41.37±0.84)% vs.(26.36±1.33)%]、ROS水平[(42.62±0.71)% vs.(22.50±0.37)%]和线粒体膜电位下降细胞比例[(43.85±0.71)% vs.(24.96±1.04)%]明显降低(均
P
=0.000),SOD[(288.16±14.59) ng/mL vs.(658.87±13.22) ng/mL]、GSH-PX[(6.66±0.37) ng/mL vs.(15.66±0.56) ng/mL]和CAT[(40.89±1.04) pg/mL
vs.(87.91±1.56) pg/mL]水平明显升高(均
P
=0.000),p-Drp1/Drp1水平(0.96±0.05
vs. 0.63±0.01)明显下调(
P
=0.001、0.000),Mfn2蛋白表达(0.39±0.01
vs. 0.64±0.02)明显上调(均
P
=0.000)。
结论
2
ANDRO具有抑制TBHP诱导的NPC细胞凋亡的作用,其机制可能与调节线粒体功能,缓解氧化应激有关。
Objective
2
To investigate the effect and mechanism of andrographolide(ANDRO) on intervertebral disc nucleus pulposus cell(NPC) apoptosis induced by tert-butyl hydroperoxide(TBHP).
Methods
2
The cell model of NPCs induced by TBHP was established. NPCs were divided into five groups: control group,model group(100 μmol/L TBHP),low-dose ANDRO group(100 μmol/L TBHP+9 μmol/L ANDRO),middle-dose ANDRO group(100 μmol/L TBHP+18 μmol/L ANDRO),and high-dose ANDRO group(100 μmol/L TBHP+36 μmol/L ANDRO). Cell apoptosis and reactive oxygen species(ROS) levels were determined by flow cytometry. The levels of oxidative stress related indicators,such as superoxide dismutase(SOD),glutathione peroxidase(GSH-PX),and catalase(CAT),were determined by an enzyme-linked immunosorbent assay kit. Mitochondrial membrane potential was measured by a JC-1 probe. Western blot was used to determine the expression levels of dynamin-related protein 1(Drp1),phosphorylated Drp1(p-Drp1),and mitofusin 2(Mfn2).
Results
2
Compared with the control group,the model group had significantly increased apoptosis rate of NPCs,ROS level,and proportion of cells with decreased mitochondrial membrane potential(all
P
=0.000),significantly decreased SOD,GSH-PX,and CAT levels(all
P
=0.000),a significantly up-regulated p-Drp1/Drp1 level(
P
=0.000),and significantly down-regulated protein expression of Mfn2(
P
=0.000). Compared with the model group,the high-dose ANDRO group had significantly decreased apoptosis rate of NPCs[(41.37±0.84)% vs.(26.36±1.33)%],ROS level[(42.62±0.71)% vs.(22.50±0.37)%],and proportion of cells with decreased mitochondrial membrane potential[(43.85±0.71)% vs.(24.96±1.04)%](all
P
=0.000),significantly increased SOD[(288.16±14.59) ng/mL vs.(658.87±13.22) ng/mL],GSH-PX[(6.66±0.37) ng/mL vs. (15.66±0.56) ng/mL],and CAT[(40.89±1.04) pg/mL
vs. (87.91±1.56) pg/mL] levels(all
P
=0.000),a significantly down-regulated p-Drp1/Drp1 level(0.96±0.05
vs. 0.63±0.01)(
P
=0.001,0.000),and significantly up-regulated protein expression of Mfn2(0.39±0.01 vs. 0.64±0.02)(all
P
=0.000).
Conclusion
2
ANDRO can inhibit TBHP-induced NPC apoptosis,and the mechanism may be related to the regulation of mitochondrial function and the relief of oxidative stress.
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