[关键词]
[摘要]
摘要:目的 探讨苦丁冬青苷 D (KD-D) 对人 HCC-1806 乳腺癌细胞增殖、凋亡、自噬的影响及机制。方法 将人 HCC-1806 乳腺癌细胞作为研究对象,给予不同浓度 KD-D 处理后,采用 CCK-8 法检测细胞存活率; EdU 法检测细胞增殖能力;结晶紫染色法检测细胞克隆形成能力;流式细胞术 (Annexin V-FITC/PI 法) 检测细 胞凋亡;JC-1 染色法检测细胞线粒体膜电位;免疫荧光法检测细胞 Cleaved Caspase-3、LC3、P62 蛋白表达; Western Blot 法检测细胞 Cleaved Caspase-3、Pan-AKT、Phosp-AKT、LC3Ⅱ蛋白表达;自噬双标 mRFP-EGFP- LC3 腺病毒感染实验检测细胞自噬流。结果 与对照组比较,12.5、25、50、100、200、400 μmol·L-1 KD-D 处理 HCC-1806 细胞 24、48 h 后,随着给药浓度增大和处理时间延长,细胞活性显著降低 (P<0.001) ,细胞 内吸光度值显著降低 (P<0.001) ,细胞增殖受到抑制;60、80 μmol·L-1 KD-D 组的细胞克隆形成计数显著减少 (P<0.001) ;50、100、150 μmol·L-1 KD-D 组细胞的早期及晚期凋亡比例均显著升高 (P<0.05,P<0.001) ; 40、60、80 μmol·L-1 KD-D组的红色荧光比例显著下降 (P<0.001) ,绿色荧光比例显著升高 (P<0.01,P<0.001) , HCC-1806 细胞线粒体膜电位下降;60、80、100 μmol·L-1 KD-D 组细胞的 Cleaved Caspase-3 蛋白表达均显著 上调(P<0.001),60 μmol·L-1 KD-D 组细胞的 Pan-AKT、Phosp-AKT 蛋白表达均显著上调(P<0.001); 60 μmol·L-1 KD-D 组细胞的 LC3 蛋白荧光小点数量显著增加 (P<0.001) ,P62 蛋白平均荧光强度显著降低 (P<0.001) ,LC3Ⅱ蛋白表达显著上调 (P<0.001) ,自噬小体及自噬溶酶体数量显著增加 (P<0.01,P<0.001) , 自噬流激活。与 60 μmol·L-1 KD-D 组比较,KD-D+AKT 抑制剂(Afuresertib)组细胞的 Cleaved Caspase-3、 Pan-AKT 蛋白表达显著下调 (P<0.01,P<0.001) ,Phosp-AKT 蛋白表达显著上调 (P<0.001) 。结论 KD-D 能抑制人乳腺癌 HCC-1806 细胞增殖,并诱导其发生凋亡和自噬,KD-D 诱导 HCC-1806 细胞凋亡可能与激活AKT 信号影响 Cleaved Caspase-3 表达有关。
[Key word]
[Abstract]
Objective To investigate the effect and mechanism of kudinoside D (KD-D) on proliferation, apoptosis and autophagy of human HCC-1806 breast cancer cells. Methods Human HCC-1806 breast cancer cells were treated with different concentrations of KD-D,and the cell viability was detected by CCK-8 method. EdU method was used to detect cell proliferation ability;the ability of cell clone formation was detected by crystal violet staining. Apoptosis was detected by flow cytometry (Annexin V-FITC/PI). Mitochondrial membrane potential was detected by JC-1 staining. The protein expressions of Cleaved Caspase-3, LC3 and P62 were detected by immunofluorescence. The protein expressions of Cleaved Caspase-3, Pan-AKT, Phosp-AKT and LC3 Ⅱ were detected by Western Blot. Autophagy double-labeled mRFP-EGFP-LC3 adenovirus infection assay was used to detect cell autophagy flow. Results Compared with the control group,HCC-1806 cells were treated with 12.5,25, 50,100,200,400 μmol·L-1 KD-D for 24 and 48 hours. With the increase of drug concentration and treatment time,the cell activity was significantly decreased (P<0.001),the intracellular absorbance value was significantly decreased(P<0.001),and the cell proliferation was inhibited. The cell clone formation counts in 60 and 80 μmol·L-1 KD-D groups were significantly decreased (P<0.001). The proportion of early and late apoptosis in 50,100, 150 μmol·L-1 KD-D groups were significantly increased(P<0.05,P<0.001). The proportion of red fluorescence in 40, 60 and 80 μmol·L-1 KD-D groups were significantly decreased (P<0.001), the proportion of green fluorescence was significantly increased(P<0.01,P<0.001),and the mitochondrial membrane potential of HCC- 1806 cells decreased. The protein expression of Cleaved Caspase-3 in 60,80,100 μmol·L-1 KD-D group were significantly up-regulated (P<0.001),and the protein expressions of Pan-AKT and Phosp-AKT in 60 μmol·L-1 KD-D group were significantly up-regulated (P<0.001). In the 60 μmol·L-1 KD-D group,the number of LC3 protein fluorescent dots was significantly increased (P<0.001),the average fluorescence intensity of P62 protein was significantly decreased (P<0.001),the expression of LC3Ⅱ protein was significantly up-regulated (P<0.001),the number of autophagosomes and autolysosomes were significantly increased (P<0.01,P<0.001),and the autophagic flow was activated. Compared with 60 μmol·L-1 KD-D group,the expression of Cleaved Caspase-3 and Pan-AKT protein in KD-D + AKT inhibitor (Afuresertib) group was significantly down-regulated (P<0.01, P<0.001),and the expression of Phosp-AKT protein was significantly up-regulated (P<0.001). Conclusion KD-D can inhibit the proliferation of human breast cancer HCC-1806 cells and induce apoptosis and autophagy. The apoptosis of HCC-1806 cells induced by KD-D may be related to the activation of AKT signal and the expression of Cleaved Caspase-3.
[中图分类号]
R285.5
[基金项目]
国家自然科学基金项目 (81402818);安徽省教育厅高校科学研究项目 (YJS20210556)