miR-216a对重症急性胰腺炎腺泡损伤及P2X7-NLRP3/caspase-1 通路的影响

目的探索miR-216a对重症急性胰腺炎(severe acute pancreatitis,SAP)腺泡细胞损伤及P2X7-NLRP3/caspase-1通路的影响.方法将大鼠胰腺腺泡细胞AR42J分为Con组、SAP组、anti-miR-NC组、anti-miR-216a组、Sch+miR-NC组、Sch+miR-216a组.Con组不做任何处理,其余各组采用雨蛙肽(10 nmol/L)联合脂多糖(lipo poly saccharide,LPS)(10 mg/L)处理大鼠胰腺腺泡细胞株AR42J构建SAP细胞模型,anti-miR-NC组、anti-miR-216a组、Sch+miR-NC组、Sch+miR-216a组分别转染anti-miR-NC、anti-miR-216a、miR-NC、miR-216a mimics.酶联免疫吸附法(enzyme linked immunosorbent assay,ELISA)测定各组细胞培养液上清中肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)、白细胞介素-6(interleukin-6,IL-6)浓度;流式细胞术检测各组细胞凋亡率;实时荧光定量聚合酶链式反应(quantitative reverse transcription-polymerase chain reaction,qRT-PCR)检测各组细胞中miR-216a及P2X7、NLRP3、caspase-1 mRNA相对表达量;Western blot法检测各组细胞中P2X7、NLRP3、Caspase-1、B细胞淋巴瘤/白血病-2基因(B-cellymphoma-2,Bcl-2)、Bcl-2相关X蛋白(Bcl-2 associated X protein,Bax)、活化的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved cysteinyl aspartate specific protease-3,Cleaved caspase-3)蛋白表达情况.结果各组细胞中IL-6、TNF-α含量比较,Con组<anti-miR-216a组<SAP组/anti-miR-NC组/Sch+miR-NC组<Sch+miR-216a组,差异有统计学意义(P<0.05).各组细胞凋亡率和Bax蛋白、Cleaved caspase-3蛋白相对表达量比较,Con组<Sch+miR-216a组<SAP组/anti-miR-NC组/Sch+miR-NC组<anti-miR-216a组,差异有统计学意义(P<0.05);各组细胞Bcl-2蛋白相对表达量比较,anti-miR-216a组<SAP组/anti-miR-NC组/Sch+miR-NC组<Sch+miR-216a组<Con组,差异有统计学意义(P<0.05).各组细胞中miR-216a和P2X7、NLRP3、Caspase-1 mRNA及其蛋白相对表达量比较,Con组<anti-miR-216a组<SAP组/anti-miR-NC组/Sch+miR-NC组<Sch+miR-216a组,差异有统计学意义(P<0.05).结论miR-216a可通过抑制P2X7-NLRP3/caspase-1信号通路减轻SAP腺泡细胞炎症,并诱导细胞凋亡,从而减轻SAP腺泡损伤.