基于mRNA高通量测序初探雷帕霉素联合鞭毛蛋白体外抑制4T1乳腺癌细胞的机制

Mechanism of rapamycin combined with flagellin inhibiting 4T1 breast cancer cells in vitro based on mRNA high-throughput sequencing

目的:利用mRNA高通量测序初步探讨雷帕霉素(Rapa)联合鞭毛蛋白(FliC)体外抑制4T1乳腺癌细胞的机制。方法:将4T1乳腺癌细胞分为对照(control)组、Rapa组、FliC组、Rapa+FliC组等4组,CCK-8法与流式细胞术检测细胞活力、凋亡的变化情况。同时,通过mRNA高通量测序,对差异表达基因(DEGs)进行KEGG通路分析;此外,通过STRING分析Rapa+FliC组与Rapa组两组间的DEGs,构建DEGs的蛋白相互作用(PPI)网络、筛选Hub基因。结果:CCK-8和流式细胞术检测结果显示,Rapa+FliC对4T1乳腺癌细胞的活力抑制率和凋亡率都显著高于Rapa和FliC(P<0.05)。转录组测序结果显示,Rapa组和control组之间共有579个DEGs,主要富集于PI3K/Akt等信号通路;FliC组和control组之间的DEGs主要富集于Nod样受体等信号通路;Rapa+FliC组与Rapa组之间共有150个DEGs,主要富集于mTOR等信号通路。从PPI网络中,成功筛选出Atm、Itga2等10个Hub基因。结论:Rapa+FliC可能通过PI3K/Akt/mTOR信号通路,在体外抑制4T1乳腺癌细胞活力,促进细胞凋亡;Atm和Itga2基因可能是两者联合作用的关键基因。

AIM:This study explores how the combination of rapamycin(Rapa)and flagellin(FliC)affects the inhibition of 4T1 breast cancer cells.The approach involves using mRNA high-throughput sequencing to examine the underlying mechanisms of this combination therapy in vitro.METHODS:4T1 breast cancer cells were divided into four groups:control group,Rapa group,FliC group,and Rapa+FliC group.The changes in cell viability and apoptosis were detected by the CCK-8 method and flow cytometry.Concurrently,the KEGG pathway of differentially expressed genes(DEGs)was analyzed by high-throughput mRNA sequencing.Furthermore,the DEGs between the Rapa+FliC group and Rapa groups were analyzed using STRING.The PPI network of DEGs was then constructed,and the Hub genes were subsequently screened.The protein expression of the Hub gene was verified based on the HPA database.RESULTS:CCK-8 assays and flow cytometry analysis revealed that the combination of Rapa and FliC significantly increased both the inhibition and apoptosis rates in 4T1 breast cancer cells compared to the rates observed with Rapa or FliC alone(P<0.05).Transcriptome sequencing indicated 579 DEGs between the Rapa group and the control group,predominantly in the PI3K/Akt signaling pathway.In contrast,DEGs between the FliC group and control were mainly concentrated in signaling pathways like NOD-like receptor signaling.Additionally,150 DEGs were identified between the Rapa+FliC group and the Rapa group,focusing primarily on pathways such as mTOR.From the protein-protein interaction(PPI)network,ten hub genes,including Atm and Itga2,were identified.CONCLUSION:The combination of Rapa+FliC could inhibit the viability of 4T1 breast cancer cells in vitro and promote apoptosis,potentially through the PI3K/Akt/mTOR signaling pathway.The genes Atm and Itga2 could be pivotal in mediating the joint effect of this combination therapy.