Sirtuin 2(SIRT2)inhibition or Sirt2 knocko ut in animal models protects against the development of neurodegenerative diseases and cerebral ischemia.However,the role of SIRT2 in traumatic brain injury(TBI)remains uncle...Sirtuin 2(SIRT2)inhibition or Sirt2 knocko ut in animal models protects against the development of neurodegenerative diseases and cerebral ischemia.However,the role of SIRT2 in traumatic brain injury(TBI)remains unclear.In this study,we found that knockout of Sirt2 in a mouse model of TBI reduced brain edema,attenuated dis ruption of the blood-brain barrie r,decreased expression of the nucleotide-binding oligomerization domain-like receptor protein 3(NLRP3)inflammasome,reduced the activity of the effector caspase-1,reduced neuroinflammation and neuronal pyroptosis,and improved neurological function.Knoc kout of Sirt2 in a mechanical stretch injury cell model in vitro also decreased expression of the NLRP3 inflammasome and pyroptosis.Our findings suggest that knockout of Sirt2 is neuro protective against TBI;therefore.Sirt2 could be a novel to rget for TBI treatment.展开更多
目的探讨慢病毒介导的沉默信息调节因子2(silent information regulator2,SIRT2)基因沉默对肝癌细胞的迁移和侵袭能力的影响。方法 Western blot分析SIRT2在多个肝癌细胞系和永生化肝细胞中的表达,通过慢病毒介导的shRNA干扰技术靶向沉...目的探讨慢病毒介导的沉默信息调节因子2(silent information regulator2,SIRT2)基因沉默对肝癌细胞的迁移和侵袭能力的影响。方法 Western blot分析SIRT2在多个肝癌细胞系和永生化肝细胞中的表达,通过慢病毒介导的shRNA干扰技术靶向沉默SIRT2的表达,并通过Real-time PCR和Western blot验证SIRT2基因的沉默效果。细胞迁移及侵袭实验检测SIRT2基因沉默对肝癌细胞迁移和侵袭能力的影响,Western blot检测上皮细胞间充质转化(epithelialmesenchymal transition,EMT)指标蛋白(E-cadherin、α-catenin、α-SMA、N-cadherin)的表达。结果 SIRT2在多个肝癌细胞系中蛋白表达水平明显上调;慢病毒介导的shRNA能显著抑制细胞SIRT2的表达水平(P<0.05)。SIRT2基因沉默能抑制肝癌细胞的迁移和侵袭能力(P<0.01),并使上皮属性蛋白E-cadherin、α-catenin表达水平升高,使间质属性蛋白α-SMA、N-cadherin表达水平降低。结论 SIRT2基因沉默可以通过抑制肝癌细胞上皮细胞间充质转化从而抑制肝癌细胞的迁移和侵袭能力。展开更多
沉默信息调节因子(silence information regulator,sirtuin)是一类高度保守的烟酰胺腺嘌呤二核苷酸(NAD^+)依赖的组蛋白去乙酰化酶,在衰老、代谢、细胞凋亡、基因转录、炎症发生等过程中发挥重要作用。哺乳动物有7种sirtuin,即SIRT1~SI...沉默信息调节因子(silence information regulator,sirtuin)是一类高度保守的烟酰胺腺嘌呤二核苷酸(NAD^+)依赖的组蛋白去乙酰化酶,在衰老、代谢、细胞凋亡、基因转录、炎症发生等过程中发挥重要作用。哺乳动物有7种sirtuin,即SIRT1~SIRT7。其中SIRT2的异常表达与包括肝癌在内的多种癌症相关:SIRT2既可以发挥癌基因的作用,也可以发挥抑癌基因的作用。而SIRT2如何通过对不同底物去乙酰化发挥不同的作用仍然存在争议。该文主要对SIRT2在肝癌发生发展中的作用进行综述。展开更多
目的探讨沉默信息调节因子2相关酶2(silent information regulator 2 related enzyme 2,SIRT2)基因沉默对肝癌细胞增殖的影响及分子机制。方法利用慢病毒介导的shRNA干扰技术,靶向沉默SIRT2基因的表达;Western blot检测SIRT2基因沉默效...目的探讨沉默信息调节因子2相关酶2(silent information regulator 2 related enzyme 2,SIRT2)基因沉默对肝癌细胞增殖的影响及分子机制。方法利用慢病毒介导的shRNA干扰技术,靶向沉默SIRT2基因的表达;Western blot检测SIRT2基因沉默效果及SIRT2沉默后β-catenin蛋白的表达变化;流式细胞计数检测SIRT2基因沉默后肝癌细胞周期的变化,CCK-8法检测SIRT2基因沉默对肝癌细胞增殖的影响,台盼蓝计数检测SIRT2基因沉默及过表达β-catenin后,SIRT2基因沉默对肝癌细胞增殖的影响;BrdU实验检测SIRT2基因沉默对肝癌细胞DNA合成的影响;平板集落实验检测SIRT2沉默对肝癌细胞克隆形成能力的影响。结果 SIRT2 shRNA靶向沉默显著抑制肝癌细胞SIRT2的表达水平,shRNA沉默组肝癌细胞PLC-5的增殖能力较对照组分别下降48.3%(shSIRT2-1)、55.6%(shSIRT2-2)(P<0.01);SIRT2基因沉默后,肝癌细胞出现G1期阻滞,β-catenin蛋白表达水平下降;过表达β-catenin后SIRT2基因沉默组较对照组肝癌细胞增殖分别升高了89%(shSIRT2-1)、75%(shSIRT2-2)(P<0.01)。结论 SIRT2沉默可能通过调节β-catenin信号通路来影响肝癌细胞增殖。展开更多
基金supported by the National Nature Science Foundation of China,Nos.81671207 and 81974189(both to HLT)。
摘要Sirtuin 2(SIRT2)inhibition or Sirt2 knocko ut in animal models protects against the development of neurodegenerative diseases and cerebral ischemia.However,the role of SIRT2 in traumatic brain injury(TBI)remains unclear.In this study,we found that knockout of Sirt2 in a mouse model of TBI reduced brain edema,attenuated dis ruption of the blood-brain barrie r,decreased expression of the nucleotide-binding oligomerization domain-like receptor protein 3(NLRP3)inflammasome,reduced the activity of the effector caspase-1,reduced neuroinflammation and neuronal pyroptosis,and improved neurological function.Knoc kout of Sirt2 in a mechanical stretch injury cell model in vitro also decreased expression of the NLRP3 inflammasome and pyroptosis.Our findings suggest that knockout of Sirt2 is neuro protective against TBI;therefore.Sirt2 could be a novel to rget for TBI treatment.
摘要沉默信息调节因子(silence information regulator,sirtuin)是一类高度保守的烟酰胺腺嘌呤二核苷酸(NAD^+)依赖的组蛋白去乙酰化酶,在衰老、代谢、细胞凋亡、基因转录、炎症发生等过程中发挥重要作用。哺乳动物有7种sirtuin,即SIRT1~SIRT7。其中SIRT2的异常表达与包括肝癌在内的多种癌症相关:SIRT2既可以发挥癌基因的作用,也可以发挥抑癌基因的作用。而SIRT2如何通过对不同底物去乙酰化发挥不同的作用仍然存在争议。该文主要对SIRT2在肝癌发生发展中的作用进行综述。