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氧化苦参碱通过COX-2/PINK1/Parkin信号通路介导的线粒体自

          噬对MG63骨肉瘤细胞的促凋亡机制                                        Δ



          姬健钧 ,邱文奎(开封市中心医院骨科二病区,河南 开封 475000)
                          #
                *
          中图分类号  R965      文献标志码  A      文章编号  1001-0408(2024)01-0044-07
          DOI  10.6039/j.issn.1001-0408.2024.01.08

          摘   要  目的  基于环氧合酶2(COX-2)/PTEN诱导激酶1(PINK1)/帕金森病蛋白2(Parkin)信号通路介导的线粒体自噬研究氧化
          苦参碱对人骨肉瘤MG63细胞的促凋亡机制。方法  取MG63细胞经2.0、4.0、8.0 mg/mL的氧化苦参碱和6 μmol/L的5-氟尿嘧啶
         (5-FU)作用后,检测细胞凋亡率、凋亡相关蛋白[B细胞淋巴瘤2(Bcl-2)、Bcl-2相关X蛋白(Bax)]表达水平、线粒体膜电位降低比
          例、线粒体自噬水平以及 PINK1、Parkin、微管相关蛋白 1 轻链 3Ⅱ(LC3-Ⅱ)蛋白表达水平。采用 PINK1 小干扰 RNA(PINK1
          siRNA)干扰 PINK1 的表达,将细胞分为对照组、PINK1 siRNA 组、氧化苦参碱组、PINK1 siRNA+氧化苦参碱组,检测细胞中
          PINK1、Parkin、LC3-Ⅱ蛋白表达水平和线粒体膜电位降低比例以及细胞凋亡率。采用慢病毒感染使COX-2过表达,将细胞分为
          对照组、氧化苦参碱组、COX-2组、COX-2+氧化苦参碱组,检测细胞中COX-2、PINK1和Parkin蛋白表达水平以及线粒体膜电位降
          低比例。结果  经氧化苦参碱干预后,细胞凋亡率,Bax、PINK1、Parkin、LC3-Ⅱ蛋白表达水平,线粒体自噬水平和线粒体膜电位降
          低比例均显著升高(P<0.05),Bcl-2蛋白表达水平显著降低(P<0.05)。与氧化苦参碱组比较,PINK1 siRNA+氧化苦参碱组细胞
          中PINK1、Parkin、LC3-Ⅱ蛋白表达水平和细胞凋亡率以及线粒体膜电位降低比例均显著降低(P<0.05)。与氧化苦参碱组比较,
          COX-2+氧化苦参碱组细胞中COX-2蛋白表达水平显著升高(P<0.05),PINK1、Parkin蛋白表达水平和线粒体膜电位降低比例均
          显著降低(P<0.05)。结论  氧化苦参碱可通过抑制COX-2表达,介导线粒体自噬信号通路PINK1/Parkin的过度活化,从而促进骨
          肉瘤细胞凋亡。
          关键词  氧化苦参碱;骨肉瘤;细胞凋亡;线粒体自噬;环氧合酶2;PTEN诱导激酶1;帕金森病蛋白2

          Mechanism  of  oxymatrine  promoting  the  apoptosis  of  osteosarcoma  MG63  cell  line  through  mitophagy
          mediated by COX-2/PINK1/Parkin signaling pathway
          JI Jianjun,QIU Wenkui(Second  Ward  of  Orthopaedics,  Kaifeng  Central  Hospital,  Henan  Kaifeng  475000,
          China)

          ABSTRACT    OBJECTIVE  To  study  the  mechanism  of  oxymatrine  inducing  apoptosis  of  osteosarcoma  MG63  cell  line  based  on
          mitophagy mediated by cyclooxygenase-2 (COX-2)/PTEN-induced putative kinase-1 (PINK1)/Parkinson disease protein-2 (Parkin)
          signaling  pathway.  METHODS  MG63  cells  were  treated  with  2.0,  4.0,  8.0  mg/mL  oxymatrine  and  6  μmol/L  5-fluorouracil,  then
          the  apoptotic  rate,  the  expression  of  apoptosis-related  proteins  [B-cell  lymphoma-2 (Bcl-2),  Bcl-2  related  X  protein (Bax)],  the
          proportion  of  decrease  in  mitochondrial  membrane  potential,  the  level  of  mitophagy  as  well  as  the  protein  expressions  of  PINK1,
          Parkin, and microtubule-associated protein 1 light chain-3Ⅱ (LC3-Ⅱ) were detected. PINK1 small interfering RNA (siRNA) was
          adopted  to  intervene  in  the  expression  of  PINK1,  the  cells  were  divided  into  control  group,  PINK1  siRNA  group,  oxymatrine
          group, and PINK1 siRNA+oxymatrine group; the protein expressions of PINK1, Parkin, and LC3-Ⅱ, the proportion of decrease
          in mitochondrial membrane potential (MMP) as well as apoptotic rate were detected. The lentivirus infection technique was used to
          overexpress  COX-2,  the  cells  were  divided  into  control  group,  oxymatrine  group,  COX-2  group,  and  COX-2+oxymatrine  group.
          The  protein  expressions  of  COX-2,  PINK1,  and  Parkin,  as  well  as  the  proportion  of  decrease  in  MMP  were  detected.  RESULTS
          After being treated with oxymatrine, the apoptotic rate, the protein expressions of Bax, PINK1, Parkin, and LC3-Ⅱ, the level of
          mitophagy  as  well  as  the  proportion  of  decrease  in  MMP  were  significantly  increased (P<0.05),  while  the  protein  expression  of
          Bcl-2 was significantly decreased (P<0.05). Compared with the oxymatrine group, the protein expressions of PINK1, Parkin, and
          LC3-Ⅱ,  apoptotic  rate  and  the  proportion  of  decrease  in  MMP  were  significantly  decreased  in  PINK1  siRNA+oxymatrine  group
                                                             (P<0.05).  Compared  with  the  oxymatrine  group,  the  protein
              Δ 基金项目 河南省医学科技攻关计划项目(No.LHGJ20210834)           expression  of  COX-2  in  the  COX-2+oxymatrine  group  was
             * 第一作者 主 治 医 师 ,硕 士 。 研 究 方 向 :骨 科 学 。 E-mail:
                                                              increased  significantly  (P<0.05) ,  while  the  protein
          jijianjun653@163.com
                                                              expressions  of  PINK1  and  Parkin  as  well  as  the  proportion  of
              # 通信作者 副主任医师,硕士。研究方向:骨科学。E-mail:
          526087266@qq.com                                    decrease  in  MMP  were  decreased  significantly (P<0.05).


          · 44 ·    China Pharmacy  2024 Vol. 35  No. 1                                中国药房  2024年第35卷第1期
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