姜黄素调控转录因子FOXP3影响HIV-1感染辅助受体CCR5的作用机制研究  

Mechanism of curcumin-regulated transcription factor FOXP3 on effects of HIV-1 infection co-receptor CCR5

作　　者：冯龙[1] 李青雅[1] 李寒冰[1] 王白燕[1] 曹珊[1] 郑文锦 耿宇轩 李青 FENG Long;LI Qingya;LI Hanbing;WANG Baiyan;CAO Shan;ZHENG Wenjin;GENG Yuxuan;LI Qing(Henan University of Chinese Medicine,School of Medicine,Zhengzhou 450046,China)

机构地区：[1]河南中医药大学医学院,郑州450046

出　　处：《中国免疫学杂志》2024年第4期772-779,共8页Chinese Journal of Immunology

基　　金：国家自然科学基金项目(81503677,81603607);河南省自然科学基金项目(162300410189);河南省高校重点科研项目(20A310008);河南省科技攻关项目(232102310434)。

摘　　要：目的:探讨姜黄素通过调控转录因子FOXP3影响HIV-1感染辅助受体CCR5的作用机制。方法:利用生物信息学方法预测并分析转录因子FOXP3与CCR5启动子的结合位点;采用AutoDock 4.2软件对姜黄素与FOXP3进行柔性对接;MTT法检测姜黄素对Jurkat细胞活性的影响;qRT-PCR和Western blot检测不同浓度姜黄素作用于Jurkat细胞后CCR5和FOXP3 mRNA和蛋白表达水平;构建pcDNA3.1-FOXP3真核表达载体;结合转录因子预测结果,运用Overlap PCR法扩增突变型CCR5基因片段,构建突变型CCR5启动子报告载体pFireRluc-Mt-CCR5;利用双荧光素酶报告基因技术验证转录因子FOXP3与CCR5的启动子结合位点。结果:JASPAR转录因子预测结果显示,CCR5启动子区与转录因子FOXP3存在结合位点;分子对接结果显示,姜黄素能够与FOXP3的酶活区域结合;MTT结果显示,姜黄素作用24 h后对Jurkat细胞活性产生抑制作用,IC50为34.48μmol/L;qRT-PCR和Western bot结果显示,不同浓度姜黄素作用于Jurkat细胞后,CCR5和FOXP3 mRNA和蛋白表达水平均降低,且存在剂量依赖性;双荧光素酶报告基因技术证实FOXP3能够与CCR5启动子结合,且转录因子FOXP3可调控CCR5启动子活性;过表达FOXP3后,姜黄素对CCR5的作用结果显示:当姜黄素浓度为60μmol/L时,作用于共转染pcDNA3.1-FOXP3和pFireRluc-Wt-CCR5的HEK293T细胞CCR5启动子荧光素酶活性相对值明显高于pFireRluc-Wt-CCR5+curcumin-60组(P<0.01)。结论:FOXP3能够调控CCR5启动子活性,其作用机制可能是姜黄素通过作用于FOXP3与CCR5启动子结合位点影响CCR5启动子活性。Objective:To investigate the mechanism of curcumin affecting HIV-1 infection co-receptor CCR5 by regulating transcription factor FOXP3.Methods:Binding sites of transcription factor FOXP3 on CCR5 promoter were predicted and analyzed by bioinformatics method.AutoDock 4.2 software was used to connect curcumin and FOXP3 flexibly.MTT assay was used to detect cytotoxcity of curcumin on activity of Jurkat cells.qRT-PCR and Western blot were used to detect expression levels of CCR5 and FOXP3 mRNA and protein in Jurkat cells that were treated with different concentrations of curcumin.pcDNA3.1-FOXP3 expression vector was built and combined with the prediction results of transcription factors.The mutant CCR5 gene fragment was amplified by Overlap PCR,and the mutant CCR5 promoter recombinant vector pFireRluc-Mt-CCR5 was constructed.Binding site between transcription factor FOXP3 and CCR5 promoter was verified by double luciferase reporter gene assay.Results:Results of JASPAR transcription factor prediction showed that there was a binding site between CCR5 promoter and transcription factor FOXP3;molecular docking results showed that curcumin could bind to the active region of FOXP3;MTT results showed that curcumin inhibited the activity of Jurkat cells after 24 hours,and the IC50 was 34.48μmol/L.qRT-PCR and Western blot showed that expression levels of CCR5 and FOXP3 mRNA and protein were decreased in a dose-dependent manner after different concentrations of curcumin treated Jurkat cells;double luciferase reporter gene confirmed that FOXP3 could bind to CCR5 promoter,and the transcription factor FOXP3 could regulate the activity of CCR5 promoter;results of the recovery experiment of FOXP3 on curcumin showed that when the curcumin concentration was 60μmol/L,relative value of luciferase activity in HEK293T cells with pcDNA3.1-FOXP3 and pFireRluc-Wt-CCR5 was significantly higher than that in pFireRluc-Wt-CCR5+curcumin-60 group(P<0.01).Conclusion:FOXP3 can regulate the activity of CCR5 promoter,and the mechanism may be that cur

关 键 词：姜黄素 FOXP3 CCR5 HIV-1 调控 

分 类 号：R392[医药卫生—免疫学]