摘要目的:探究环状RNA VMA21(circVMA21)是否靶向miR-497-5p/黏蛋白(MUC1)影响LPS诱导的肺上皮细胞炎症因子表达和细胞凋亡.方法:肺上皮细胞A549分为Con组(对照)、LPS组(LPS损伤)、LPS+pcDNA组、LPS+pcDNA-circ VMA21 组、LPS+anti-miR-NC组、LPS+anti-miR-497-5p组、LPS+pcDNA-circVMA21+miR-NC组、LPS+pcDNA-circVMA21+miR-497-5p组.qRT-PCR测定circVMA21和miR-497-5p表达,ELISA测定炎症因子IL-6、IL-1β和TNF-α表达,流式细胞术测定细胞凋亡,Western blot测定MUC1、TLR4/NF-κB通路和凋亡相关cleaved-caspase3、cleaved-caspase9蛋白表达.双荧光素酶报告实验测定circVMA21与miR-497-5p、miR-497-5p与MUC1的靶向关系.结果:与Con组比较,LPS组肺上皮细胞中circVMA21、MUC1表达量减少,miR-497-5p表达量、IL-6、IL-1β、TNF-α表达水平、细胞凋亡率和凋亡蛋白cleaved-caspase3、cleaved-caspase9及TLR4、p-NF-κB p65/NF-κB p65表达增加(P<0.05).与LPS+pcDNA组比较,LPS+pcDNA-circVMA21组肺上皮细胞中circV-MA21、MUC1表达升高,IL-6、IL-1β、TNF-α表达水平、细胞凋亡率和蛋白cleaved-caspase3、cleaved-caspase9及TLR4、p-NF-κB p65/NF-κB p65表达降低(P<0.05).circVMA21靶向调控miR-497-5p表达.与LPS+anti-miR-NC组比较,LPS+anti-miR-497-5p组肺上皮细胞中MUC1表达升高,IL-6、IL-1β、TNF-α表达水平、细胞凋亡率和蛋白cleaved-caspase3、cleaved-caspase9及TLR4、p-NF-κB p65/NF-κB p65表达量降低(P<0.05).miR-497-5p靶向调控MUC1表达.与LPS+pcDNA-circVMA21+miR-NC组比较,LPS+pcDNA-circVMA21+miR-497-5p组肺上皮细胞中MUC1表达降低,IL-6、IL-1β、TNF-α表达水平、细胞凋亡率和蛋白cleaved-caspase3、cleaved-caspase9及TLR4、p-NF-κB p65/NF-κB p65表达升高(P<0.05).结论:circVMA21可能通过靶向下调miR-497-5p促进MUC1表达,抑制TLR-4/NF-κB通路活化,进而减少LPS诱导的肺上皮细胞炎症因子表达和细胞凋亡.