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白花丹素對術前PF化療殺傷舌鱗癌細胞凋亡和自噬的影響及作用機制

發(fā)布時間:2018-07-25 19:50
【摘要】:目的:研究白花丹素(Plumbagin,PB)對術前PF化療方案殺傷舌鱗癌CAL27細胞凋亡和自噬的影響及作用機制。方法:1、人舌鱗癌CAL27細胞的細胞培養(yǎng)。2、MTT法分別檢測PB、DDP、5-Fu對CAL27細胞的增殖抑制作用及半數抑制濃度IC50。3、MTT法檢測PB聯(lián)合PF方案對CAL27細胞的增殖抑制作用。4、流式細胞儀檢測PB和/或PF方案作用于舌鱗癌CAL27細胞后的細胞凋亡率。5、Cyto ID熒光顯微鏡檢測PB和/或PF方案作用于舌鱗癌CAL27細胞后的自噬水平。6、Western Blot法檢測PB和/或PF方案作用于舌鱗癌CAL27細胞后自噬相關蛋白Beclin1、LC3的表達。7、Western Blot法檢測PB和/或PF方案作用于舌鱗癌CAL27細胞后PI3K/AKT/mTOR信號通路蛋白的表達。結果:1、PB、DDP、5-Fu分別以濃度依賴方式抑制CAL27細胞增殖,其作用24h的半數抑制濃度(IC50)分別為7.77μmol/L、10.50μg/ml、1.26mg/ml。2、PB聯(lián)合PF方案作用,與單獨PF方案比較,舌鱗癌CAL27細胞的增殖抑制作用明顯增強。3、PB聯(lián)合PF方案作用,與單獨PF方案比較,舌鱗癌CAL27細胞的凋亡率明顯增強。4、PB聯(lián)合PF方案作用,與單獨PF方案比較,舌鱗癌CAL27細胞的自噬水平明顯增強。5、當PB單獨作用時,CAL27細胞中PI3K、p-AKT、p-mTOR蛋白表達不同程度下調,且PB聯(lián)合PF方案比起單獨應用PF方案,其細胞中PI3K、p-AKT、p-mTOR蛋白表達亦不同程度降低。6、應用PI3K/AKT激動劑IGF-1、mTOR激動劑MHY1485作用后,該激動劑逆轉了PB對CAL27細胞中PI3K、p-AKT、p-mTOR蛋白的下調作用,同時顯著抑制PB對PF化療CAL27細胞凋亡和自噬誘導作用。結論:白花丹素通過抑制PI3K/AKT/mTOR信號通路誘導舌鱗癌細胞凋亡和自噬從而增強PF化療方案殺傷舌鱗癌CAL27細胞。
[Abstract]:Aim: to study the effect and mechanism of Plumbagin PB on apoptosis and autophagy of CAL27 cells in tongue squamous cell carcinoma treated with PF regimen before operation. Methods the cell culture of human tongue squamous cell carcinoma (CAL27) cells was used to detect the proliferation inhibition of CAL27 cells by PBP 5-Fu, the inhibitory effect of PB combined with PF regimen on the proliferation of CAL27 cells by IC50.3% MTT assay, and the proliferation inhibition of PB by flow cytometry. Apoptosis rate of CAL27 cells in tongue squamous cell carcinoma treated with PF and / or PF. 5 Cyto ID fluorescence microscope to detect autophagy level of PB and / or PF on CAL27 cells of tongue squamous cell carcinoma. Western Blot assay to detect PB and / or PF regimen acting on tongue scale Expression of autophagy associated protein Beclin1hLC3 in CAL27 cells was detected by Western Blot. The expression of PI3K/AKT/mTOR signal pathway protein was detected by PB and / or PF regimen in CAL27 cells of tongue squamous cell carcinoma. Results the proliferation of CAL27 cells was inhibited in a concentration-dependent manner. The half inhibitory concentration (IC50) was 7.77 渭 mol / L (10.50 渭 g / L) and 1.26 mg / ml 路2nPB in combination with PF regimen, respectively. Compared with PF alone, the inhibitory concentration (IC50) was 7.77 渭 mol 路L ~ (-1) 路ml ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1), respectively. Compared with PF alone, the apoptotic rate of CAL27 cells in tongue squamous cell carcinoma was significantly increased, and compared with PF alone, the apoptotic rate of CAL27 cells in tongue squamous cell carcinoma was significantly increased. The level of autophagy in CAL27 cells of tongue squamous cell carcinoma was significantly increased. When PB was treated alone, the expression of p-mTOR protein was down-regulated in CAL27 cells, and PB combined with PF regimen was significantly lower than that of PF alone. The expression of PI3Knp-AKTor p-mTOR protein was also decreased in different degree. The agonist MHY1485, a PI3K/AKT agonist, reversed the down-regulation of PI3KPT-AKTnp-mTOR protein in CAL27 cells by using IGF-1mTOR agonist. At the same time, PB significantly inhibited apoptosis and autophagy induced by PF chemotherapeutic CAL27 cells. Conclusion: Baihuadan inhibits PI3K/AKT/mTOR signaling pathway and induces apoptosis and autophagy in tongue squamous cell carcinoma cells, thereby enhancing PF chemotherapy regimen to kill CAL27 cells.
【學位授予單位】:南昌大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R739.86

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