突变的CEBPA通过缺陷的AP-1激活促进对炎症性压力的耐受性
Maria Cadefau-Fabregat1,2,3, Gerard Martínez-Cebrián1, Lucía Lorenzi1
1Josep Carreras Leukaemia Research Institute (IJC), Badalona, Spain.
Nature communications
|April 12, 2025
概括
在急性髓性白血病 (AML) 中,突变的CCAAT增强剂结合蛋白α (CEBPA) 产生一种改变炎症和压力反应的p30异型. 这影响了细胞因子分泌,并赋予了对炎症的抵抗力,揭示了潜在的AML脆弱性.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 免疫学 免疫学 免疫学
背景情况:
- CCAAT增强剂结合蛋白α (CEBPA) 是一种转录因子,在急性髓性白血病 (AML) 中经常发生突变.
- CEBPA突变往往导致双性损失和产生截断的p30异型,与正规的p42异型不同.
- 对于CEBPA突变的功能后果,特别是p30异型在AML发病过程中的作用,目前尚不完全理解.
研究的目的:
- 阐明由正规的p42和AML相关的p30CEBPA异型调节的独特的转录程序.
- 研究这些异构体如何影响细胞对炎症刺激和压力的反应.
- 确定与AML中的突变CEBPA相关的潜在治疗漏洞.
主要方法:
- 对表达p42和p30异型的细胞之间的基因表达特征进行比较分析.
- 评估转录诱导动态响应脂多糖 (LPS) 刺激.
- 对细胞因子分泌概况的评估.
- 在ER压力条件下研究AP-1家族蛋白调节和ATF4功能.
主要成果:
- 表达p30异型的细胞表现出基线炎症基因表达的减少.
- 表达p30的细胞对LPS的转录反应发生变化,导致修饰的细胞因子分泌.
- 这些细胞对长时间的炎症信号具有较强的抵抗力.
- 包括ATF4在内的AP-1家族蛋白的差异调节是这些功能变化的基础.
- 在p30表达细胞中的ATF4功能受损会影响对内质网膜 (ER) 应激反应.
结论:
- 突变CEBPA (p30异型) 在AML细胞中显著改变炎症基因表达和细胞因子分泌.
- 通过增加对炎症应激的抵抗力,p30异型赋予了生存优势.
- 失调AP-1蛋白和改变ER应激反应是关键机制.
- 这些发现强调了突变CEBPA,炎症和AML中的压力反应途径之间的关键联系,表明了新的治疗点.
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