摘要
目的:探讨在骨髓增生异常综合征(MDS)中TP53基因不同突变状态(野生型/突变型)对地西他滨(DAC)耐药性的影响,并筛选耐药相关调控基因。方法:选用2种TP53状态差异的MDS细胞:M-07e:野生型;SKM-1:突变型,用递增浓度(0、0.5、1、5和10μmol/L)的地西他滨干预0-72 h后,采用CCK-8法检测细胞活力。通过RNA-Seq转录组测序和甲基化组学分析,筛选与耐药相关的关键基因。结果:CCK-8实验结果显示DAC对M-07e和SKM-1细胞活力的抑制作用呈时间和剂量依赖性(SKM-1耐药性最强,IC_(50)=5μmol/L vs M-07e IC_(50)=0.5μmol/L,P<0.01)。基因表达分析结果显示,M-07e细胞经DAC处理后共鉴定到662个上调基因和452个下调基因;SKM-1细胞经DAC处理后共发现515个上调基因和73个下调基因。蛋白质组学检测显示:DAC处理的M-07e细胞中共鉴定117个上调蛋白和136个下调蛋白;DAC处理的SKM-1细胞中发现91个上调蛋白和46个下调蛋白。通过整合分析上调基因和蛋白表达谱,共筛选出181个候选基因。甲基化组学分析发现884个低甲基化基因中存在高敏感位点和高CpG密度区域,其中与上述181个候选基因存在交集的共31个基因,GO功能富集分析表明这31个基因主要参与细胞分化正调控、结合过程负调控以及细胞组分组织负调控等生物学过程。结论:TP53突变通过表观遗传重编程介导DAC耐药,靶向这些基因可能改善TP53突变型MDS的预后。
Objective:To investigate the effects of TP53 genetic status(wild-type/mutated/null)on the drug resistance of decitabine(DAC)in myelodysplastic syndromes(MDS)and identify key resistance-associated genes.Methods:Two myeloid cell lines with distinct TP53 status(M-07e:wild-type;SKM-1:mutated;)were treated with gradient DAC concentrations(0-10μmol/L)for 0-72 h.Cell viability was detected by CCK-8 assay.RNA-Seq transcriptomics,and methylation profiling were integrated to analyze differentially expressed genes.Results:Decitabine(DAC)treatment induced time-and dose-dependent inhibition of cell viability in CCK-8 assays,with SKM-1 cells exhibiting the highest resistance(IC_(50)=5μmol/L vs M-07e=0.5μmol/L,P<0.01).Transcriptomic analysis revealed 662 upregulated and 452 downregulated genes in DAC-treated M-07e cells,while SKM-1 cells showed 515 upregulated and 73 downregulated genes.By proteomic profiling,117 upregulated and 136 downregulated proteins were identified in M-07e cells,while 91 upregulated and 46 downregulated proteins were identified in SKM-1 cells following DAC exposure.Through integrated analysis of upregulated genes and proteins expression profiles,181 candidate genes were screened out,while methylation studies identified 884 hypomethylated genes with high-sensitivity loci and CpG density. Notably, 31 genes overlapped between these datasets, and functional annotation indicated these drug-resistance-associated genes are primarily involved in positive regulation of cell differentiation, negative regulation of binding processes, and negative regulation of cellular component organization. Conclusion: TP53 mutations drive DAC resistance via epigenetic reprogramming. Targeting these genes may improve outcomes in TP53-mutated MDS.
作者
张岚
任育烨
陈玮
胡文雅
赵晨曦
苏丽萍
ZHANG Lan;REN Yu-Ye;CHEN Wei;HU Wen-Ya;ZHAO Chen-Xi;SU Li-Ping(Department of Hematology,The First Hospital,Shanxi Medical University,Taiyuan 030001,Shanxi Province,China;Department of Hematology,Shanxi Province Cancer Hospital/Shanxi Hospital Affiliated to Cancer Hospital,Chinese Academy of Medical Sciences/Cancer Hospital Affiliated to Shanxi Medical University,Taiyuan 030013,Shanxi Province,China;Shanxi Provincial Key Laboratory of Lymphoma Precision Diagnosis and Treatment Research,Taiyuan 030013,Shanxi Province,China)
出处
《中国实验血液学杂志》
北大核心
2025年第6期1681-1687,共7页
Journal of Experimental Hematology
基金
山西省重点实验室开放课题项目(KFKT2024003)
山西省科技合作交流专项(202304041101043)。
