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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