[关键词]
[摘要]
【目的】 探讨靛蓝对脂多糖(LPS)诱导的角质形成细胞(HaCaT)炎症因子及芳香烃受体(AhR)/ NOD样受体热蛋白结构 域相关蛋白 3(NLRP3)信号通路的影响。【方法】 建立 LPS 诱导的 HaCaT 细胞模型,设置实验分组:空白组、模型组、靛蓝 组、AhR激动剂[2,3,7,8-四氯二苯并二噁英(TCDD)]组、AhR抑制剂(CH-223191)组、靛蓝+AhR抑制剂组。采用细胞计 数试剂盒 8(CCK-8)法检测不同浓度靛蓝、TCDD、CH-223191干预 24 h对 HaCaT细胞活性的影响。通过实时荧光定量聚合 酶链反应(qPCR)检测各组细胞中白细胞介素 1β(IL-1β)、核因子 κB(NF-κB)、肿瘤坏死因子 α(TNF-α)、AhR、细胞色素 P450家族 1亚家族 A成员 1(CYP1A1)、NLRP3、半胱天冬酶 1(Caspase-1)、凋亡相关斑点样蛋白(ASC)的 mRNA 表达水平。 采用蛋白质免疫印迹(Western Blot)法分析 AhR 蛋白表达的细胞定位变化。【结果】(1)靛蓝干预 HaCaT 细胞的半抑制浓度 (IC50)为118.7 μmol·L-1 。不同浓度的CH-223191及TCDD处理24 h对HaCaT细胞活力无明显影响。(2)与模型组比较,靛蓝组 IL-1β、NF-κB、NLRP3及Caspase-1的mRNA表达水平下降(P<0.05或P<0.000 1),而AhR、CYP1A1的mRNA表达水平显 著升高(P<0.05或P<0.000 1)。(3)与空白组比较,靛蓝组细胞质内AhR蛋白表达水平下降,细胞核内AhR蛋白表达水平升 高(P<0.001或 P<0.000 1)。(4)与模型组比较,靛蓝组和 AhR激动剂组 AhR的 mRNA表达水平显著上升(P<0.05),AhR抑 制剂组的 AhR、CYP1A1 的 mRNA 表达水平下降(P<0.05),而 IL-1β、NLRP3 的 mRNA 表达水平上升(P<0.05)。(5)与 AhR 抑制剂组比较,靛蓝+AhR 抑制剂组中 AhR、CYP1A1 的 mRNA 表达水平上升(P<0.05),NLRP3、Caspase-1、IL-1β 的 mRNA 表达水平下降(P<0.05)。【结论】 靛蓝可降低 LPS 诱导的 HaCaT 细胞炎症因子,且通过激活 AhR 负调控炎症小体 NLRP3参与抑制银屑病的发生发展。
[Key word]
[Abstract]
Objective To investigate the effect of indigo on inflammatory factors and the aryl hydrocarbon receptor (AhR)/NOD-like receptor thermal protein domain associated protein 3 (NLRP3) signaling pathway in lipopolysaccharide (LPS)-induced keratinocytes (HaCaT cells). Methods An LPS-induced HaCaT cell model was established,and experimental groups were set as follows:blank group,model group,indigo group,AhR agonist (2, 3, 7, 8-tetrachlorodibenzo-p-dioxin, TCDD) group, AhR inhibitor (CH-223191) group, and indigo + AhR inhibitor group. The Cell Counting Kit-8(CCK-8) assay was used to detect the effects of different concentrations of indigo, TCDD, and CH-223191 on HaCaT cell viability after 24 hours of intervention. Quantitative real-time PCR (qPCR) was employed to measure the mRNA expression levels of interleukin-1β (IL-1β),nuclear factor kappa B (NF-κB),tumor necrosis factor-α(TNF-α),AhR,cytochrome P450 family 1 subfamily A member 1(CYP1A1),NLRP3,Caspase-1,and apoptosis-associated speck-like protein (ASC)in each group. Western Blot analysis was used to assess changes in the cellular localization of AhR protein expression. Results (1)The IC50 of indigo intervention in HaCaT cells was 118.7 μmol·L-1 . Treatment with different concentrations of CH-223191 and TCDD for 24 hours had no significant effect on HaCaT cell viability.(2)Compared with the model group,the indigo group showed decreased mRNA expression levels of IL-1β,NF-κB,NLRP3, and Caspase-1 (P<0.05 or P<0.000 1), while the mRNA expression levels of AhR and CYP1A1 were significantly increased (P<0.05 or P<0.000 1).(3)Compared with the blank group,the indigo group reduced cytoplasmic AhR protein expression and increased nuclear AhR protein expression (P<0.001 or P<0.000 1). (4)Compared with the model group,both the indigo group and the AhR agonist group significantly increased AhR mRNA expression levels (P<0.05), while the AhR inhibitor group decreased AhR and CYP1A1 mRNA expression levels (P<0.05) and increased IL-1β and NLRP3 mRNA expression levels (P<0.05).(5)Compared with the AhR inhibitor group,the indigo + AhR inhibitor group showed increased mRNA expression levels of AhR and CYP1A1(P<0.05) and decreased mRNA expression levels of NLRP3,Caspase-1,and IL-1β(P<0.05). Conclusion Indigo reduces inflammatory factors in LPS-induced HaCaT cells and participates in inhibiting the occurrence and development of psoriasis by activating AhR to negatively regulate the NLRP3 inflammasome.
[中图分类号]
R285.5
[基金项目]
国家自然科学基金项目(编号:82374313);广东省教育厅高校科研项目(编号:2021ZDZX2026);国家中医药传承创新中心科研 专项项目(编号:2022QN28);广东省中医药局科研项目(编号:20251116);劳绍贤全国名老中医传承工作室项目