目的 探討2',4'-二羥基-3'-甲基-3-甲氧基查耳酮(C20)對(duì)人肝癌HepG2細(xì)胞的體外抗腫瘤作用及其潛在的作用機(jī)制。方法 通過(guò)CCK-8法、集落形成實(shí)驗(yàn)、5-乙炔基-2'-脫氧尿苷(EdU)染色法檢測(cè)C20對(duì)人肝癌HepG2細(xì)胞增殖的影響;通過(guò)彗星實(shí)驗(yàn)檢測(cè)C20(10 μmol·L^-1)對(duì)HepG2細(xì)胞DNA損傷的影響;通過(guò)流式細(xì)胞術(shù)檢測(cè)C20(5、10 μmol·L^-1)對(duì)HepG2細(xì)胞周期阻滯的影響;通過(guò)Hoechst染色和流式細(xì)胞術(shù)檢測(cè)C20(5、10 μmol·L^-1)對(duì)HepG2細(xì)胞凋亡的影響。借助Western blotting法檢測(cè)C20(5、10 μmol·L^-1)處理對(duì)HepG2細(xì)胞中與凋亡、DNA損傷、細(xì)胞周期阻滯相關(guān)蛋白表達(dá)水平的調(diào)控作用。結(jié)果 與對(duì)照組比較,C20顯著抑制HepG2細(xì)胞的活力(P<0.001),給藥48 h的半數(shù)抑制濃度(IC₅₀)為7.937 μmol·L^-1;5 μmol·L^-1 C20能夠顯著抑制HepG2細(xì)胞的集落形成能力(P<0.01);EdU染色結(jié)果顯示5、10 μmol·L^-1的C20能夠抑制人肝癌HepG2細(xì)胞的增殖能力;5、10 μmol·L^-1的C20顯著誘導(dǎo)HepG2細(xì)胞G₂/M期阻滯(P<0.001);5、10 μmol·L^-1的C20顯著促進(jìn)HepG2細(xì)胞凋亡(P<0.001),并顯著上調(diào)Caspas-3、Caspase-9以及PARP的剪切水平(P<0.01);10 μmol·L^-1的C20能夠誘導(dǎo)HepG2細(xì)胞發(fā)生DNA損傷,并且5、10 μmol·L^-1的C20顯著上調(diào)γH2AX、p21的蛋白水平(P<0.01)。結(jié)論 C20能夠造成HepG2細(xì)胞發(fā)生DNA損傷,上調(diào)p21蛋白水平,導(dǎo)致細(xì)胞G₂/M期阻滯,并進(jìn)一步誘發(fā)凋亡,發(fā)揮體外抗肝癌作用。

Objective To investigate the in vitro antitumor effects of 2',4'-dihydroxy-3'-methyl-3-methoxychalcone (C20) on human hepatocellular carcinoma HepG2 cells and its potential mechanisms. Methods The effects of C20 on the proliferation of HepG2 cells were detected by CCK8 assay, colony formation assay, and 5-ethynyl-2'-deoxyuridine (EdU) staining assay. The effects of C20 (10 μmol·L^-1) on DNA damage of HepG2 cells were detected by comet assay. The effects of C20 (5, 10 μmol·L^-1) on cell cycle of HepG2 cells were detected by flow cytometry. The effects of C20 (5 and 10 μmol·L^-1) on apoptosis of HepG2 cells were detected by Hoechst staining and flow cytometry. The effects of C20 (5 and 10 μmol·L^-1) on expression levels of proteins related to DNA damage, cell cycle, and apoptosis in HepG2 cells were detected by Western blotting. Results Compared with control group, C20 significantly inhibited the viability of HepG2 cells (P < 0.001), with a half-maximal inhibitory concentration (IC₅₀) of 7.937 μmol·L^-1 after 48 h of treatment; 5 μmol·L^-1 C20 significantly inhibited the colony-forming ability of HepG2 cells (P < 0.01); the EdU staining results showed that 5 and 10 μmol·L^-1 of C20 could inhibit the proliferation of human hepatocellular carcinoma HepG2 cells; 5 and 10 μmol·L^-1 of C20 significantly induced G₂/M phase arrest in HepG2 cells (P < 0.001); 5 and 10 μmol·L^-1 of C20 significantly promoted apoptosis in HepG2 cells (P < 0.001), and significantly upregulated the cleavage levels of Caspas-3, Caspase- 9, and PARP (P < 0.01); 10 μmol·L^-1 of C20 could induce DNA damage in HepG2 cells, and 5 and 10 μmol·L^-1 of C20 significantly upregulated the protein levels of γH2AX and p21 (P < 0.01). Conclusion We speculate that C20 treatment can induce DNA damage and upregulate p21 expression in HepG2 cells, leading to G₂/M arrest and further inducing apoptosis, which is partially responsible for anti-hepatocellular carcinoma activity of C20.

R965

國(guó)家自然科學(xué)基金項(xiàng)目(82074072);中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(2023-JYB-JBQN-051);北京中醫(yī)藥大學(xué)國(guó)家級(jí)人才精準(zhǔn)培育計(jì)劃(JZPY202206);國(guó)家中醫(yī)藥管理局青年岐黃學(xué)者支持項(xiàng)目