在三阴性乳腺癌中,RBM15通过向TNFSF9的甲基化和诱导瘤相关巨细胞向M2表型的两极化来增强帕克利塔塞尔耐药性
Jinkun Fu1, Chao Wei1, Yijian Chen1
1Department of General Surgery, Xianyang Hospital of Yan'an University, Xianyang, Shaanxi, China.
Hereditas
|August 20, 2025
概括
通过增强TNFSF9的m6A甲基化,导致M2巨分化,促进三阴性乳腺癌 (TNBC) 中的帕克利塔塞尔耐药性. 这一发现为克服TNBC药物耐药性的潜在治疗目标提供了帮助.
科学领域:
- 癌症学
- 分子生物学
- 免疫学
背景情况:
- 三重阴性乳腺癌 (TNBC) 预后不佳,治疗选择有限.
- 对化疗的耐药性是TNBC治疗的一个主要挑战.
- 了解化学抵抗的机制对于开发有效疗法至关重要.
研究的目的:
- 研究RNA结合动机蛋白15 (RBM15) 在TNBC中对帕克利塔塞尔 (PTX) 耐药性的作用.
- 阐明RBM15赋予PTX抗性的分子机制.
- 探索RBM15对瘤微环境的影响,特别是巨细胞两极分化.
主要方法:
- 生物信息学分析以识别PTX抗性TNBC细胞中的上调基因.
- 抗PTX的TNBC细胞系的构造和表征 (MDA-MB-231/PTX,MDA-MB-468/PTX).
- 使用各种测定方法 (CCK-8,EDU,流细胞计,Transwell) 评估细胞活力,增殖,亡,迁移,入侵和巨分化.
- 检测TNFSF9和RBM15蛋白质和mRNA水平 (西斑,RT-qPCR).
- 通过m6A修饰试验 (RIP,MeRIP) 分析RBM15-TNFSF9的相互作用.
- 使用异种移植瘤模型进行体内验证.
主要成果:
- 在抗PTX的TNBC细胞中TNFSF9的表达很高,其沉默增加了PTX的敏感性.
- 抑制TNFSF9将巨细胞偏向从M2转移到M1,改变细胞因子 (减少IL-10,TGF-β;增加IL-1β,TNF-α).
- 发现RBM15通过m6A修饰来调节TNFSF9的表达.
- 在体外和体内,TNFSF9的过度表达逆转了RBM15沉默的瘤抑制作用.
- 患者样本证实了RBM15在PTX抗性TNBC组织中高TNFSF9表达中的作用.
结论:
- 通过增强TNFSF9的m6A甲基化,RBM15促进了TNBC中的PTX耐药性.
- 这一过程导致与瘤相关的巨细胞的M2两极分化,导致化学抵抗.
- 针对RBM15/TNFSF9轴可能是克服TNBC中PTX耐药性的新疗法.
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