石 金,于永波,张 杰.ATG7对神经母细胞瘤增殖和耐药的影响及机制研究[J].肿瘤学杂志,2018,24(6):562-567. |
ATG7对神经母细胞瘤增殖和耐药的影响及机制研究 |
Effects of ATG7 Gene on Proliferation and Drug Resistance in Neuroblastoma |
投稿时间:2017-05-08 |
DOI:10.11735/j.issn.1671-170X.2018.06.B007 |
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中文关键词: ATG7基因 神经母细胞瘤 自噬 细胞增殖 耐药性 |
英文关键词:ATG7 gene autophagy neuroblastoma cell proliferation drug resistance |
基金项目:国家自然科学基金项目(81472369,31401067,81502144);北京市科技计划(D131100005313014);首都医科大学基础-临床科研合作基金(16JL57);北京市优秀人才培养资助(2015000021469G210, 2015000021469G211) |
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中文摘要: |
摘 要:[目的] 研究自噬相关基因ATG7对神经母细胞瘤增殖和化疗耐药性的影响,初步探索其分子机制,为神经母细胞瘤临床治疗提供新的线索和理论依据。[方法] 在神经母细胞瘤细胞系SH-SY5Y和SK-N-BE2中,慢病毒转染敲减ATG7基因,采用MTT染色检测ATG7对细胞增殖能力的影响,同时通过Western blotting方法检测细胞内自噬标志性蛋白LC3表达量来反映细胞内自噬水平;通过检测Bcl-2、Bax、Caspase-3等凋亡相关蛋白研究ATG7对细胞凋亡的影响。SH-SY5Y细胞经阿霉素处理后,采用实时无标记细胞分析仪连续监测细胞增殖情况,探讨ATG7在神经母细胞瘤耐药中作用。[结果] 敲减ATG7基因能显著抑制细胞内自噬水平,而且ATG7敲减后细胞在第4、5d的增殖倍数分别为3.05±0.05和3.92±0.08,低于对照组的3.40±0.05和4.35±0.13(P=0.0012,P=0.0085);与对照组相比,ATG7敲减组其凋亡抑制蛋白Bcl-2表达明显降低,促凋亡蛋白Bax和Caspase-3表达显著升高(P<0.05)。经阿霉素处理后,ATG7敲减组细胞增殖率明显低于对照组(P<0.05)。[结论] 由于ATG7基因介导细胞自噬过程,ATG7基因在神经母细胞瘤中可能通过自噬作用促进肿瘤细胞异常增殖,抑制细胞凋亡,进而增强细胞耐药性。 |
英文摘要: |
Abstract:[Objective] To study the effects of autophagy related gene ATG7 on the proliferation and drug resistance in neuroblastoma cells. [Methods] Lentiviral was used to knockdown ATG7 gene and MTT staining was applied to evaluate cell proliferation in human neuroblastoma SH-SY5Y and SK-N-BE2 cells.To confirm the effects of ATG7 in autophagy,autophagy marker LC3 was detected;apoptosis-related proteins(Bcl-2,Bax,Caspase-3) was assessed by Western blotting. In addition,after doxorubicin(25nM) treatment,the proliferation of SH-SY5Y cells were monitored through real-time cell analyzer. [Results] Autophagy was suppressed after ATG7 knockdown in SH-SY5Y cells. The proliferation rates in ATG7 knockdown cells were significantly lower than those in the control group(3.05±0.05 vs. 3.40±0.05,3.92±0.08 vs. 4.35± 0.13,P=0.0012,0.0085) at d4 and d5,respectively. Compared to control group,the expression of Bcl-2 decreased,while the pro-apoptotic protein Bax and Caspase-3 was significantly increased(P<0.05) in ATG7 knockdown group. Moreover,compared with the control group,cell proliferation rate in ATG7 knockdown cells was significantly reduced after doxorubicin treatment. [Conclusion] ATG7 may promote cellular proliferation,suppress apoptosis and enhance drug resistance through autophagy in neuroblatoma. |
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