Abstract

目的探讨左旋门冬酰胺酶对伯基特淋巴瘤细胞株增殖、细胞周期和凋亡的影响及其作用机制。方法应用CCK-8法检测左旋门冬酰胺酶对伯基特淋巴瘤细胞株细胞增殖的影响,流式细胞术检测细胞凋亡率和细胞周期,实时定量PCR和Western blot检测分析细胞周期、凋亡、自噬和PI3K/Akt/mTOR信号通路中各种分子的表达变化。结果左旋门冬酰胺酶明显抑制多种伯基特淋巴瘤细胞株的增殖,并引起细胞周期G0/G1期阻滞,诱导细胞凋亡和自噬。进一步结果表明左旋门冬酰胺酶抑制c-Myc的表达,同时抑制p-PI3K、p-Akt-S473、p-mTOR、p-70S6K和p-4E-BP1的表达。PI3K抑制剂LY294002联合左旋门冬酰胺酶进一步诱导了细胞凋亡。此外,左旋门冬酰胺酶抑制STAT和ERK信号通路。结论左旋门冬酰胺酶抑制伯基特淋巴瘤细胞株细胞增殖和G0/G1期细胞阻滞,诱导自噬和凋亡并通过抑制PI3K/Akt/mTOR信号通路调控细胞凋亡。

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