摘要
目的探讨p53凋亡刺激蛋白2(apoptosis stimulating protein 2 of p53,ASPP2)对饥饿诱导的大肠癌HCTll6p53-/-(p53缺失)细胞自噬和凋亡的影响。方法实验分3组:(1)绿色荧光蛋白腺病毒(green fluorescent protein adenovirus,rAd-GFP)感染组(对照组);(2)自噬抑制剂LY294002处理组;(3)ASPP2腺病毒(ASPP2adenovirus,rAd-ASPP2)感染组。无血清培养基分别培养0、24、48h诱导细胞自噬和凋亡。利用calcein/PI吸收试验观察各组细胞凋亡水平。细胞转染红色荧光蛋白自噬质粒Lc3(cerisefluorescentproteinautophagyplasmidLc3,CFP-Lc3),在荧光显微镜下观察各组细胞自噬水平。结果rAd—GFP感染组饥饿24h细胞的自噬水平升高显著(0h:1.04±0.24;24h:12.17±0.86,P〈0.05),而凋亡水平改变差异无统计学意义(0h:2.01%4-0.06%;24h:3.23%±0.34%,P〉0.05);饥饿时间延长至48h,自噬水平(0h:1.044-0.24;48h:21.094-3.32)和凋亡水平(0h:2.01%4-0.06%;48h:30.20%-I-3.18%)升高,差异均具有统计学意义(均P〈0.05)。使用LY294002抑制细胞自噬,饥饿24h细胞凋亡显著增多(rAd—GFP组:3.23%±0.34%;LY294002组:15.68%±1.24%,P〈0.01),而饥饿48h凋亡显著减少(rAd—GFP组:30.20%±3.18%;LY294002组:25.44%4-3.01%,P〈0.05)。rAd—ASPP2感染组饥饿24h自噬显著降低(rAd.GFP组:12.17±0.86;ASPP2组:1.454-0.45,P〈0.01),而凋亡显著升高(rAd—GFP组:3.23%±0.34%;ASPP2组:10.45%±0.81%,P〈0.05);饥饿48h自噬(rAd—GFP组:21.09±3.32;ASPP2组:29.93±3.48)和凋亡(rAd.GFP组:30.20%±3.18%;ASPP2组:36.72%±2.74%)水平均显著升高(均P〈0.05)。结论ASPP2通过对自噬的双向调节促进饥饿诱导的大肠癌HCTl16p53。一细胞凋亡。
Objective To investigate the role of ASPP2 ( apoptosis stimulating protein 2 of p53, ASPP2) in starvation-induced autophagy and apoptosis of colorectal cancer HCTll6 p53-/- (p53 gene deletion) cell line. Methods The study included three experiment groups: green fluorescent protein adenovirus (rAd-GFP) infection group, autophagy inhibitor LY294002 treatment group and ASPP2 adenovirus (rAd-ASPP2) infection group. Celluar autophagy and apoptosis were induced by cocuhuring with serum-free medium for 0 h, 24 h, 48 h. Apoptosis level was detected by CalceirdPI uptaking test. Autophagy level was observed under the fluorescence microscope via transfeetion with cerise fluorescent protein autophagy plasmid CFP-Lc3. Results In control group, starvation for 24 hours significantly promoted autophagy of HCTll6 cells (0 h: 1.04 _+0. 24; 24 h: 12. 17 +0. 86,P 〈0. 05), while apoptosis was not increased (0 h: 2.01% ±0.06% ; 24 h: 3.23% ±0.3d% , P 〉0.05). With 48 h starvation, autophagy(0 h: 1, 04 +0. 24; 48 h: 21.09 ~3.32) and apoptosis(0 h:2.01% ±0. 06% ; 48 h:30. 20% ± 3.18% )of HCT116 inereased(P 〈 0. 05). With the use of LY294002 apoptosis induced by 24 h starvation significantly increased ( rAd-GFP group: 3.23% ± O. 34% ; LY294002 group: 15.68% _+ 1.24% , P 〈0. 01 ) , but aopotosis under 48 h starvation decreased ( rAd-GFP group: 30. 20% _+ 3.18% ; LY294002 group: 25.44% -+ 3.01%, P 〈 0.05 ). With ASPP2 transfection, autophagy under 24 h starvation significantly declined ( rAd-GFP group: 12. 17 + 0. 86, ASPP2 group: 1.45 + O. 45, P 〈 0. 01 ) , and apoptosis increased( rAd-GFP group: 3.23% -+ 0. 34% ; ASPP2 group: 10. 45% _+ O. 81% , P 〈 O. 05 ). Both autophagy (rAd-GFP group: 21.09-+ 3.32; ASPP2 group: 29. 93 + 3.48) and apoptosis (rAd-GFP group: 30. 20% -+3.18% ; ASPP2 group: 36.72% -+2. 74% ) were higher than that in controls under 48 h starvation (P 〈 0. 05 ), Conclusion
出处
《中华普通外科杂志》
CSCD
北大核心
2013年第2期129-133,共5页
Chinese Journal of General Surgery
基金
国家自然科学基金资助项目(30870853、30770742)