灯盏花乙素对J774A.1巨噬细胞中ATP诱导的炎症小体活化和细胞焦亡的影响

摘要

目的 以LPS致敏的小鼠巨噬细胞J774A.1作为炎症细胞模型,研究灯盏花乙素对ATP诱导的炎症小体活化和细胞焦亡的影响及其机制.方法 利用碘化丙锭(PI)染色法检测LPS+ ATP诱导的小鼠J774A.1巨噬细胞发生细胞焦亡的情况;免疫印迹法检测细胞裂解液和上清中IL-1β、caspase-1、HMGB1等蛋白的表达水平;基于微珠的免疫测定法(CBA)检测细胞上清中IL-1β的分泌水平.结果 ATP能够明显诱导LPS致敏的J774A.1巨噬细胞中caspase-1活化、成熟IL-1β(17 ku)和HMGB1释放至培养上清中,并诱导细胞焦亡;而灯盏花乙素预处理能够剂量依赖性地抑制ATP诱导的caspase-1活化以及成熟IL-1β、HMGB1的释放,并抑制细胞焦亡;同时,经腺苷酸环化酶抑制剂MDL12330A和蛋白激酶A(PKA)抑制剂H89处理,可以逆转灯盏花乙素对ATP诱导的细胞焦亡的抑制作用.结论 灯盏花乙素通过调节PKA活性,抑制NLRP3炎症小体的活化与细胞焦亡,从而发挥抗炎作用.%Aim To explore the influences of scutellarin on ATP-induced NLRP3 inflammasome activation and pyroptosis,using LPS-primed murine macrophages J774A.1 as an inflammatory cell model,and to explore the underlying mechanism.Methods The effects of scutellarin on ATP-induced pyroptosis in murine J774A.1 macrophages were analyzed by propidium iodide (PI) staining assay.The levels of IL-1β,caspase-1 and HMGB1 in cell lysates and culture supernatants were analysed using Western blot.The levels of IL-1β in cell culture supernatants were measured by cytometric beads array (CBA).Results ATP significantly induced caspase-1 activation and mature IL-1β and HMGB1 release into the culture supernatants in LPS-primed murine J774A.1 macrophages,and induced pyroptosis.Scutellarin treatment dose-dependently inhibited ATP-induced caspase-1 activation,mature IL-1β and HMGB1 release,and pyroptosis.Notably,scutellarin's inhibitory effects on ATP-induced pyroptosis were markedly reversed by the adenylate cyclase inhibitor MDL12330A and selective protein kinase A (PKA) inhibitor H89.Conclusion Scutellarin inhibits NLRP3 inflammasome activation and pyroptosis by modulating the PKA activity in macrophages,thereby exhibiting anti-inflammatory activities.