实用医学杂志 ›› 2021, Vol. 37 ›› Issue (1): 25-29.doi: 10.3969/j.issn.1006⁃5725.2021.01.006

• 基础研究 • 上一篇    下一篇

去泛素化酶抑制剂Au(PPh3)PT 对胃癌细胞活力和凋亡的影响及机制

张培全, 黄擎天, 龙惠丹 ,李小芬   

  1. 广州医科大学广东省蛋白质修饰与降解重点实验室(广州 511436)
  • 出版日期:2021-01-10 发布日期:2021-01-10
  • 通讯作者: 李小芬 E⁃mail:xiaofen.li@gzhmu.edu.cn
  • 基金资助:
    国家自然科学基金项目(编号:81602427);广东省自然科学基金博士启动项目(编号:2016A030310281);广东省中医药局面上科研项目(编号:20192047)

Cytotoxic effects of deubiquitinase inhibitor Au(PPh3)PT on gastric cancer cells

ZHANG Peiquan,HUANG Qingtian,LONG Huidan,LI Xiaofen
  

  1. Guangdong Provincial Key Laboratory of Protein Modification and Degrada⁃tion,Guangzhou Medical University,Guangzhou 511436,China
  • Online:2021-01-10 Published:2021-01-10
  • Contact: LI Xiaofen E⁃mail:xiaofen.li@gzhmu.edu.cn

摘要:

目的 探讨去泛素化酶抑制剂 Au(PPh3)PT 对胃癌细胞的毒性作用及机制。方法 MTS 法检测 Au(PPh3)PT 对胃癌细胞 MGC⁃803 SGC⁃7901 活力的影响;倒置荧光显微镜观察或流式细胞术检 Au(PPh3)PT 诱导胃癌细胞凋亡情况;Western blot 方法分析 Au(PPh3)PT 对凋亡相关蛋白及泛素化蛋白 的影响。结果 Au(PPh3)PT 明显抑制胃癌细胞的活力,呈浓度和时间依赖性。1.0 μmol/L 1.5 μmol/L Au(PPh3)PT 作用 24 h,胃癌细胞凋亡率显著增加(P < 0.05)。Au(PPh3)PT 引起凋亡相关蛋白 caspase⁃3 caspase⁃8、caspase⁃9 前体减少,活化带增多及 PARP 切割带出现,诱导胃癌细胞总的及 K48⁃链接的泛素化 蛋白聚集增多。结论 Au(PPh3)PT 明显抑制胃癌细胞的活力及诱导其凋亡,作用机制与 caspase 系统激 活和蛋白酶体抑制有关。

关键词:

Abstract:

Objective To investigate the effect of Deubiquitinase inhibitor Au(PPh3)PT on inducing gastric cancer cells cytotoxicity. Methods MTS assay was performed to test the cell viability of MGC⁃803 and SGC⁃ 7901 cancer cells. Apoptotic rates were assessed by microscopy and flow cytometry analysis using Annexin V/PI double staining. Apoptosis related proteins and ubiquitinated proteins were detected by western blot analysis. Results We found that Au(PPh3)PT significantly decreased the cell viability in a dose⁃ and time⁃dependent man⁃ ner. The cell apoptosis rate was obviously higher than that in control group after 24 h treatment with 1.0 μmol/L and 1.5 μmol/L of Au(PPh3)PT(P < 0.05). It was confirmed that Au(PPh3)PT resulted in a reduction in precursor forms of caspase⁃3,⁃8,and ⁃9 with a concomitant increase in the cleaved forms of caspase⁃3,caspase⁃8,caspase⁃9 and PARP. Also,we found that a striking increase in total and K48⁃linked ubiquitinated proteins. Conclusion The results show that Au(PPh3)PT induced cytotoxicity and cell death in gastric cancer cells. This effect may be 

Key words: