To explore the mechanism of Dahuang Lingxian Formula in relieving inflammatory response of bile duct cells based on IL-6/JAK/STAT3 signaling pathway

Objective:To explore the mechanism of action of Dahuang Lingxian Formula in alleviating the inflammatory response of bile duct cells in LPS-induced intrahepatic bile duct inflammation model rats based on IL-6/JAK/STAT3 signaling pathway.Methods:Fifty SD rats were randomly divided into five groups,blank group,model group,choling tablets(0.5 g/kg),and low and high concentration groups(2.4 g/kg and 4.8 g/kg)of Dahuang Lingxian Formula,ten rats in each group.Except for the blank group,the rats in each group were injected with 1.25 mg/kg LPS at the common bile duct at one time to construct an animal model of intrahepatic bile duct infection.After gavage on day 8,liver tissues were taken from rats at the hepatic hilum,and the histopathological changes of the hepatic hilum and biliary tree were observed by HE staining.The expression levels of serum glutamic alanine transaminase(ALT),glutamic oxalacetic transaminase(AST),malondialdehyde(MDA)and superoxide dismutase(SOD)were measured by biochemical method.The expression levels of interleukin 6(IL-6),Janus protein tyrosine kinase 2(JAK2),signal transducer and activator of transcription 3(STAT3)in rat serum were measured by enzyme-linked immunosorbent assay(ELISA).Protein immunoblotting(WB)and real-time fluorescence quantitative PCR(RT-qPCR)were used to detect the expression levels of IL-6,JAK2,STAT3 protein and mRNA in biliary tree tissues.Results:①Compared with the blank group,the structures such as interlobular bile ducts in the hepatic sinusoids and portal duct area of the model rats were destroyed,and inflammatory cells infiltrated around them.The expression of ALT,AST,MDA,IL-6,JAK2 and STAT3 in the serum increased significantly,the expression level of SOD decreased,and the expression levels of IL-6,JAK2 and STAT3 proteins and mRNA increased.②Compared with the model group,the degree of liver pathological damage in rats in the Chiling Ning tablet group and the low and high concentration groups of Dahuang Lingxian Formula were improved,which could significantly reduce the expression levels of ALT,AST,MDA,IL-6,JAK2,STAT3 and up-regulate SOD in serum,and down-regulate the expression of IL-6,JAK2,STAT3 protein and mRNA,with the best effect in the high concentration group of Dahuang Lingxian Formula.③Compared with the choling tablet group,the rats in the low and high concentration groups of Dahuang Lingxian Formula tended to normalize the degree of liver pathological damage,without obvious inflammatory cell infiltration,and the expression levels of ALT,AST,MDA,IL-6,JAK2,STAT3 and the expression levels of IL-6,JAK2,STAT3 protein and mRNA in serum were reduced,and the expression levels of SOD were increased,with the best effect of Dahuang Lingxian Formula The treatment effect was best in the high concentration group.Conclusion:The mechanism may be related to the down-regulation of IL-6/JAK/STAT3 signaling pathway activation,and the best therapeutic effect was achieved by the high concentration group of Dahuang Lingxian Formula.

miR-19a-3p靶向调控CCND1基因介导FrA-1/IL-6/Stat3信号通路对乳腺癌侵袭转移的作用机制

目的探究miR-19a-3p靶向CCND1基因介导FrA-1/IL-6/Stat3通路对乳腺癌侵袭转移的作用机制。方法癌细胞分组转染(空白组、阴性对照组、miR-19a-3p mimic组、siRNA-CCND1组、miR-19a-3p mimic+siRNA-CCND1组)。分别应用qRT-PCR、Western blot、MTT、划痕实验和Transwell侵袭实验检测相关基因mRNA和蛋白表达及细胞生物学行为变化趋势。结果人乳腺癌组织和细胞中CCND1和Fra-1的表达明显上升,而miR-19a-3p明显下降,差异有统计学意义(P <0. 05)。与空白组和阴性对照组相比,另外3组的miR-19a-3p、CCND1、FrA-1表达水平均上调(P <0. 05),miR-19a-3p mimic+siRNA-CCND1组中上调更为明显(P <0. 05)。各组细胞在24 h时无明显差异。48 h和96 h各组细胞增殖能力均提高。空白组与阴性对照组细胞增殖能力相比无明显差异。另外3组的细胞增殖能力均明显增强,差异有统计学意义(P <0. 05),但miR-19a-3p mimic+siRNA-CCND1组中细胞增殖变化趋势较弱,差异有统计学意义(P <0. 05)。与空白组和阴性对照组相比,另外3组细胞迁移、侵袭能力均减弱,差异有统计学意义(P <0. 05),且miR-19a-3p mimic+siRNA-CCND1组迁移、侵袭能力最弱,差异有统计学意义(P <0. 05)。结论 miR-19a-3p在乳腺癌中呈下降趋势,上调miR-19a-3p可有效抑制CCND1基因表达和FrA-1/IL-6/Stat3通路激活,从而降低乳腺癌细胞侵袭转移。

Sphingosine kinase 1 promotes growth of glioblastoma by increasing inflammation mediated by the NF-κB/IL-6/STAT3 and JNK/PTX3 pathways

Glioblastoma(GBM)is the most challenging malignant tumor of the central nervous system because of its high morbidity,mortality,and recurrence rate.Currently,mechanisms of GBM are still unclear and there is no effective drug for GBM in the clinic.Therefore,it is urgent to identify new drug targets and corresponding drugs for GBM.In this study,in silico analyses and experimental data show that sphingosine kinase 1(SPHK1)is up-regulated in GBM patients,and is strongly correlated with poor prognosis and reduced overall survival.Overexpression of SPHK1 promoted the proliferation,invasion,metastasis,and clonogenicity of GBM cells,while silencing SPHK1 had the opposite effect.SPHK1 promoted inflammation through the NF-κB/IL-6/STAT3 signaling pathway and led to the phosphorylation of JNK,activating the JNK-JUN and JNK-ATF3 pathways and promoting inflammation and proliferation of GBM cells by transcriptional activation of PTX3.SPHK1 interacted with PTX3 and formed a positive feedback loop to reciprocally increase expression,promote inflammation and GBM growth.Inhibition of SPHK1 by the inhibitor,PF543,also decreased tumorigenesis in the U87-MG and U251-MG SPHK1 orthotopic mouse models.In summary,we have characterized the role and molecular mechanisms by which SPHK1 promotes GBM,which may provide opportunities for SPHK1-targeted therapy.