桔皮素对人肝癌HepG2细胞体外增殖和侵袭的影响及机制研究
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篇名: 桔皮素对人肝癌HepG2细胞体外增殖和侵袭的影响及机制研究
TITLE:
摘要: 目的:考察桔皮素对人肝癌HepG2细胞体外增殖和侵袭的影响,并探讨其作用机制。方法:以0(空白对照组)、10、20、40、60、80 μmol/L桔皮素分别作用于细胞24、48 h后,采用CCK-8法检测细胞增殖率,并计算其半数抑制浓度(IC50)。以0、20、30   μmol/L桔皮素作用细胞48 h后,采用Transwell侵袭实验考察其对细胞侵袭的影响;并分别采用实时荧光定量聚合酶链式反应法和Western blot法考察其对细胞中E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、波形蛋白(Vimentin)、Notch-1、免疫细胞表面抗原44(CD44)、基质金属蛋白酶9(MMP-9) mRNA及其蛋白表达的影响;采用Western blot法考察蛋白激酶B(Akt)、糖原合成酶激酶3β(GSK-3β)的磷酸化水平。结果:10~80 μmol/L桔皮素对人肝癌HepG2细胞的体外增殖均具有明显的抑制作用,且呈时间和剂量依赖性,增殖率较空白对照组显著降低(P<0.05),作用24、48 h后的IC50分别为55.7、23.4 μmol/L。20、30 μmol/L桔皮素作用48 h后,细胞侵袭能力明显受到抑制;细胞中N-cadherin、Vimentin 、Notch-1、CD44和MMP-9 mRNA及其蛋白水平表达明显降低,E-cadherin mRNA及其蛋白表达水平明显升高,且Akt、GSK-3β磷酸化水平升高,较空白对照组差异均有统计学意义(P<0.05)。结论:桔皮素可抑制人肝癌HepG2细胞的体外增殖和侵袭;其机制可能与下调细胞中Notch-1表达、抑制细胞的上皮-间质转化而抑制CD44和MMP-9的表达,以及抑制其上游Akt-GSK-3β信号途径有关。
ABSTRACT: OBJECTIVE: To investigate the effects of tangeretin on in vitro proliferation and invasion of human hepatocellular carcinoma HepG2 cells, and to investigate its mechanism. METHODS: After treated with 0 (blank control group), 10, 20, 40, 60, 80 μmol/L tangeretin for 24, 48 h, the rate of cell proliferation was detected by CCK-8 assay, and IC50 was calculated. After treated with 0, 20, 30 μmol/L tangeretin for 48 h, Transwell invasion test was used to investigate the effects of tangeretin on cell invasion. The effects of tangeretin on mRNA and protein expression of E-cadherin, N-cadherin, Vimentin, Notch-1, CD44 and MMP-9 were determined by RT-PCR and Western blot assay. The phosphorylation of Akt and GSK-3β were investigated by Western blot assay. RESULTS: 10-80 μmol/L tangeretin significantly inhibited in vitro proliferation of human hepatocellular carcinoma HepG2 cells in time and dose-dependent manner; proliferation rates of them were significantly lowered, compared to blank control group (P<0.05); IC50 were 55.7, 23.4 μmol/L after treated for 24, 48 h. After treated with 20, 30 μmol/L tangeretin for 48 h, cell invasion was inhibited in HepG2 cells; mRNA and protein expression of N-cadherin, Vimentin, Notch-1, CD44 and MMP-9 decreased significantly, while those of E-cadherin increased significantly; the phosphorylated levels of Akt and GSK-3β increased; there was statistical significance between them and blank control group (P<0.05). CONCLUSIONS: Tangeretin can inhibit in vitro proliferation and invasion of human hepatocellular carcinoma HepG2 cell, which may be associated with inhibiting the expression of CK44 and MMP-9 and signal pathway of upstream Akt-GSK-3β through up-regulating the expression of Notch-1 and inhibiting epithelial-mesenchymal transition.
期刊: 2016年第27卷第34期
作者: 孙志欣,张莹
AUTHORS: SUN Zhixin,ZHANG Ying
关键字: 桔皮素;人肝癌HepG2细胞;增殖;侵袭;上皮-间质转化
KEYWORDS: Tangeretin; Human hepatocellular carcinoma HepG2 cells; Proliferation; Invasion; Epithelial-mesenchymal transition
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