IL-21通过 SENP1调控 NK细胞生物学特性

目的 探讨IL-21对小泛素相关修饰蛋白特异性蛋白酶1(SENP1)表达的影响及其对NK细胞生物学特性的调控作用.方法 以NK92细胞系为模型,采用慢病毒介导的Senp1基因干涉策略,抑制NK92细胞SENP1的表达.实时荧光定量PCR和Western印迹检测SENP1表达水平;利用CCK-8细胞增殖检测试剂盒测定细胞增殖活性;Annexin Ⅴ-APC/PI标记检测细胞凋亡.将K562细胞与NK92细胞共培养,荧光素酶报告基因方法检测NK92细胞的杀伤活性.结果 IL-21处理上调NK92细胞SENP1的表达;慢病毒介导Senp1-shRNA转染显著降低NK92细胞内Senp1 mRNA和蛋白表达水平.Senp1干涉组NK92细胞增殖能力较对照组明显降低.同时,干涉Senp1能促进NK92细胞凋亡,但对NK92细胞杀伤K562活性无显著影响.结论 IL-21上调NK92细胞SENP1的表达;干涉Senp1能抑制NK92细胞增殖,促进细胞凋亡,同时影响穿孔素表达和对肿瘤细胞的杀伤活性.

IL-21 modulates biological characteristics of NK92 cells by upregulating SENP1 expression

Objective To investigate the roles of SENP1 in regulation of biological characteristics of NK cells.Methods Lentivirus-mediated-Senp1-small-hairpinRNA (shRNA) transduction was applied to NK92 cells.The expression of SENP1 in NK92 cells was determined by real-time PCR and Western blot.The proliferation of NK92 cells was detected by CCK-8 assay.The apoptosis of NK92 cells was determined by Annexin Ⅴ and PI labeling.The cytotoxicity of NK92 cells against K562 cells was evaluated by luciferase reporter assay.Results Treatment of NK92 cells with IL-21 resulted in SENP1 upregulation.Lentivirus mediated SENP1 knockdown reduced proliferation and increased apoptosis in NK-92 cells,but SENP1 inhibition had slight impact on the cytotoxic ability of NK92 cells to kill K562 cells.Conclusion SENP1 mediates the regulatory effect of IL-21 on the proliferation and survival of NK92 cells.