吉林大学学报(医学版) ›› 2022, Vol. 48 ›› Issue (3): 711-717.doi: 10.13481/j.1671-587X.20220320

• 基础研究 • 上一篇    

贝母素乙对肺癌A549细胞凋亡的诱导作用及其机制

杨明星,董文(),李冀   

  1. 海南省肿瘤医院呼吸内科,海南 海口 570312
  • 收稿日期:2021-07-24 出版日期:2022-05-28 发布日期:2022-06-21
  • 通讯作者: 董文 E-mail:tonydwking@126.com
  • 作者简介:杨明星(1979-),男,海南省琼海市人,主治医师,主要从事慢性肺部疾病和呼吸系统疾病方面的研究。
  • 基金资助:
    海南省科技厅重点研发计划项目(ZDYF2018172)

Inductive effect of peiminine on apoptosis of lung cancer A549 cells and its mechanism

Ming xing YANG,Wen DONG(),Ji LI   

  1. Department of Respiratory Medicine,Hainan Cancer Hospital,Haikou 570312,China
  • Received:2021-07-24 Online:2022-05-28 Published:2022-06-21
  • Contact: Wen DONG E-mail:tonydwking@126.com

摘要: 目的

探讨不同浓度贝母素乙(PMI)对人肺癌A549细胞凋亡的影响,阐明其可能的分子机制。

方法

采用不同浓度PMI(0.025、0.050、0.100、0.200和0.400 mmol·L-1)分别处理A549细胞24、48和72 h,MTT法检测A549细胞增殖活性,并计算半数抑制浓度(IC50)。不同浓度PMI(0.050、0.100、0.200 mmol·L-1)或0.200 mmol·L-1 PMI联合p38 MAPK抑制剂SB203580处理A549细胞48 h后,细胞分为空白对照组、不同浓度(0.050、0.100和0.200 mmol·L-1)PMI组和联合组(0.200 mmol·L-1 PMI + 20 μmol·L-1 SB203580)。Annexin Ⅴ-FITC/PI法检测各组细胞凋亡率,Western blotting法检测各组细胞中凋亡相关蛋白B细胞淋巴瘤2(Bcl-2)、Bcl-2相关X蛋白(Bax)和cleaved-caspase-3及p38丝裂原活化蛋白激酶(p38 MAPK)/p53信号通路相关蛋白磷酸化p38MAPK (p-p38MAPK)(Thr180/Thr182)、p-p53(ser15)、p53、PUMA和小鼠双微体2(MDM2)表达水平,免疫荧光实验观察各组细胞中p53蛋白定位情况。

结果

与对照组比较,0.10和0.20 mmol·L-1 PMI组A549细胞存活率降低(P<0.05),细胞凋亡率升高(P<0.05),细胞中Bax、cleaved-caspase-3、p-p38MAPK(Thr180/Thr182)、p-p53(ser15)、p53和PUMA蛋白表达水平均升高(P<0.05),Bcl-2和MDM2蛋白表达水平均降低(P<0.05)。与0.20 mmol·L-1 PMI组比较,联合组A549细胞存活率升高(P<0.05),细胞凋亡率降低(P<0.05),细胞中Bax、cleaved-caspase-3p-p38MAPK(Thr180/Thr182)、p-p53(ser15)、p53和PUMA蛋白表达水平均降低(P<0.05),Bcl-2和MDM2蛋白表达水平均升高(P<0.05)。免疫荧光检测,p53蛋白存在由细胞质向细胞核转移的现象,且p53蛋白在细胞质和细胞核均有表达。

结论

PMI可诱导A549细胞凋亡,其分子机制可能与p38 MAPK/p53信号通路介导的细胞凋亡有关。

关键词: 贝母素乙, 肺肿瘤, p38丝裂原活化蛋白激酶, p53, 细胞凋亡

Abstract: Objective

To discuss the effect of different concentrations of peiminine (PMI) on the apoptosis of the human lung cancer A549 cells, and to clarify its possible molecular mechanism.

Methods

The A549 cells were treated with different concentrations (0.025, 0.050, 0.100, 0.200 and 0.400 mmol·L-1) of PMI for 24, 48 and 72 h,respectively. The proliferation activity of the A549 cells was detected by MTT method, and the half inhibitory concentration (IC50) was calculated.The A549 cells were treated with different concentrations (0.050,0.100,0.200 mmol·L-1)of PMI or 0.200 mmol·L-1 PMI combined with p38 MAPK inhibitor SB203580 for 48 h. The cells were divided into blank control group, different concentrations(0.050, 0.100 and 0.200 mmol·L-1) of PMI groups and combination group (0.200 mmol·L-1 PMI + 20 μmol·L-1 SB203580).The apoptotic rates of the A549 cells in various groups were detected by Annexin Ⅴ-FITC/PI method; the expression levels of apoptosis-related proteins B-cell lymphoma-2 (Bcl-2),Bcl-2 associated X protein(Bax),and cleaved-caspase-3 and mitogen-activated protein kinases (p38MAPK)/p53 signaling pathway related proteins phosphorylaed p38MAPK (p-p38 MAPK) (Thr180/Thr182), p-p53 (ser15), p53, PUMA, and murine double minute 2(MDM2) in the A549 cells in various groups were detected by Western blotting method the localization of p53 protein of the A549 cells in various groups was observed by immunofluorescence assay.

Results

Compared with control group, the survival rates of the A549 cells in 0.10 and 0.20 mmol·L-1 PMI groups were decreased (P<0.05), the apoptotic rates were increased (P<0.05), and the expression levels of Bax, cleaved-caspase-3, p-p38 MAPK (Thr180/Thr182), p-p53 (ser15), p53 and PUMA proteins were increased (P<0.05),and the expression levels of Bcl-2 and MDM2 proteins were decreased (P<0.05).Compared with 0.20 mmol·L-1 PMI group, the survival rate of the A549 cells in combination group was increased (P<0.05), the apoptotic rate was decreased (P<0.05), the expression levels of Bax, cleaved-caspase-3, p-p38MAPK (Thr180/Thr182), p-p53 (ser15), p53, and PUMA proteins were decreased (P<0.05), while the expression levels of Bcl-2 and MDM2 proteins were increased (P<0.05).The immunofluorescence results showed that the phenomenon of p53 protein transferring from cytoplasm to nucleus could be seen, and the p53 protein was expressed in both the cytoplasm and nucleus.

Conclusion

Peiminine can induce the apoptosis of the A549 cells, and its molecular mechanism may be related to the p38 MAPK/ P53 signaling pathway mediated apoptosis.

Key words: Peiminine, Lung neoplasm, P38 mitogen-activated protein kinase, P53, Apoptosis

中图分类号: 

  • R734.2