纤细薯蓣皂苷诱导肺癌A549细胞自噬的作用及机制
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篇名: 纤细薯蓣皂苷诱导肺癌A549细胞自噬的作用及机制
TITLE: Effect and mechanism of gracillin-induced autophagy in lung cancer A549 cells
摘要: 目的 探讨吉祥草中纤细薯蓣皂苷(gracillin)诱导人非小细胞肺癌A549细胞自噬的作用及机制。方法以A549细胞为对象,采用CCK-8法检测不同浓度(0.25、0.5、1、2、4μmol/L)gracillin作用不同时间(12、24、48h)对细胞增殖的影响。与不加药物的对照组进行比较,采用生物透射电子显微镜观察gracillin(2μmol/L)作用24h对细胞自噬小体形成的影响;通过GFP-LC3质粒转染实验检测gracillin(0.25、0.5、1、2μmol/L)作用24h后GFP-LC3在细胞自噬小体膜上的聚集情况;采用实时定量聚合酶链式反应法和Westernblot法检测gracillin(0.25、0.5、1、2μmol/L)作用24h后A549细胞中序列相似性家族102成员A(FAM102A)mRNA和蛋白的表达水平,以及自噬相关蛋白[p62、Beclin-1、微管相关蛋白1轻链3B(LC3B)]和磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(又名Akt)信号通路相关蛋白的表达水平。结果gracillin对A549细胞具有一定的增殖抑制作用,且呈浓度和时间依赖趋势;其作用24h的半数抑制浓度为2.55μmol/L。gracillin作用24h后,细胞胞浆内可见含双层膜结构的自噬小体;自噬小体膜上可见明显的GFP-LC3绿色荧光斑点,且有随药物浓度升高而增多的趋势。与对照组比较,gracillin不同浓度组细胞中FAM102AmRNA和蛋白的表达水平(0.5、1、2μmol/L组)、Beclin-1蛋白的表达水平(1、2μmol/L组)和LC3B-Ⅱ/LC3B-Ⅰ比值(2μmol/L组)均显著升高,p62蛋白的表达水平(1、2μmol/L组)和Akt蛋白(1、2μmol/L组)、PI3K蛋白(2μmol/L组)的磷酸化水平均显著降低(P<0.05或P<0.01)。结论gracillin可能通过上调FAM102AmRNA和蛋白的表达、抑制PI3K/Akt信号通路来促进A549细胞发生自噬,从而发挥抑制细胞增殖的作用。
ABSTRACT: OBJECTIVE To investigate the effect and mechanism of gracillin from Reineckia carnea on autophagy in non- small cell lung cancer A549 cells. METHODS Using A549 cells as subjects, the effects of different concentrations of gracillin (0.25, 0.5, 1, 2, 4 μmol/L) on the proliferation of cells were detected by CCK-8 after being treated for different time (12, 24, 48 h). Compared with the control group without medication, the effect of gracillin (2 μmol/L) on the formation of autophagosomes in cells was observed by transmission electron microscope after 24 h of exposure. The aggregation of GFP-LC3 on autophagosome membrane was detected by GFP-LC3 plasmid transfection after being treated with gracillin (0.25, 0.5, 1, 2 μmol/L) for 24 h. Quantitative real-time PCR and Western blot assay were used to detect the mRNA and protein expressions of family with sequence similarity 102 member A(FAM102A), the expressions of autophagy-related proteins [p62, Beclin-1, microtubule-associated protein 1 light chain 3B (LC3B)], and the expressions of phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway-related proteins in A549 cells after being treated with gracillin (0.25, 0.5, 1 and 2 μmol/L) for 24 h. RESULTS Gracillin significantly inhibited the proliferation of A549 cells in a concentration- and time-dependent manner. The IC50 was 2.55 μmol/L at 24 h. After 24 h of gracillin treatment, autophagosomes with bilayer membrane structure were found in the cell cytoplasm, and GFP-LC3 green fluorescent spots on autophagosome membrane were obvious, representing an increasing trend as drug concentration. Compared with the control group, mRNA and protein expressions of FAM102A (0.5, 1, 2 μmol/L groups), protein expression of Beclin-1 (1, 2 μmol/L groups) and LC3B-Ⅱ/LC3B-Ⅰ ratio (2 μmol/L group) were significantly increased in different concentrations of gracillin groups, while the protein expression of p62 (1, 2 μmol/L groups), and the protein phosphorylations of Akt (1, 2 μmol/L groups) and PI3K (2 μmol/L group) were all decreased significantly (P<0.05 or P<0.01). CONCLUSIONS Gracillin can promote excessive autophagy in A549 cells by up-regulating mRNA and protein expressions of FAM102A and inhibiting PI3K/Akt signaling pathway, thus inhibiting cell proliferation.
期刊: 2024年第35卷第08期
作者: 李燕;李亚梅;雷歌燕;康佳兰;刘明轩;张敏鸿;杨建琼
AUTHORS: LI Yan,LI Yamei,LEI Geyan,KANG Jialan,LIU Mingxuan,ZHANG Minhong,YANG Jianqiong
关键字: 吉祥草;纤细薯蓣皂苷;非小细胞肺癌细胞;自噬;FAM102A;PI3K/Akt信号通路
KEYWORDS: Reineckia carnea; gracillin; non-small cell lung cancer cells; autophagy; FAM102A; PI3K/Akt signaling pathway
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