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白血病突变FLT3-ITD被保留在树突细胞中,并破坏其平衡,导致扩大Th17频率

Patrick A Flynn¹, Mark D Long², Yoko Kosaka¹

¹Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, OR, United States.

Frontiers in immunology

|March 18, 2024

概括

在急性髓性白血病 (AML) 中激活FLT3 (Fms-like tyrosine kinase 3) 中的突变会改变树突细胞 (DC) 现型. 这些与白血病相关的DCs促进Th17 T细胞反应,可能会影响患者的生存.

科学领域:

免疫学免疫学免疫学
血液学血液学血液学
癌症生物学癌症生物学

背景情况:

状细胞 (DCs) 构成了天生的免疫和适应性免疫的桥梁.
类似FMS的氨酸激酶3 (FLT3) 信号传递对于DC的发展至关重要.
激活FLT3突变,如内部并列重复 (FLT3-ITD),与急性髓性白血病 (AML) 的预后不佳有关.

研究的目的:

研究FLT3-ITD突变对AML.DC树突细胞生物学和表型的影响.
了解FLT3-ITD如何影响瘤微环境中的DC种群.
为了确定改变的直流电流对T细胞偏振的下游影响.

主要方法:

使用了CITE-seq,流细胞计和人类和小鼠样本的多重免疫试验.
在FLT3-ITD+AML患者骨髓中检查了常规DC (cDC) 现型和频率.
使用FLT3-ITD+AML的小鼠模型进行体内和体外分析.

主要成果:

与健康的捐赠者相比,FLT3-ITD+ AML 患者表现出过多的cDC 种群,表型乱.
FLT3-ITD+ AML小鼠表现出增加的cDC数量,倾向于cDC2 T-bet-表型.
甲ML小鼠表现出丰富的Treg和Th17 CD4+T细胞种群;ex vivo和共同培养研究证实了FLT3-ITD+DCs的Th17倾斜.

结论:

与白血病相关的FLT3-ITD+cDCs促进CD4+T细胞向Th17亚群的偏离.
这种Th17歪曲可能会对存活率产生负面影响,类似于实体瘤的观察.
强调FLT3-ITD在塑造AML瘤微环境和免疫反应方面的复杂作用.

关键词:

在AML,AML就是AML.FLT3 FLT3 在线播放 T 辅助器 (T) 17 个细胞这就是Treg Treg.树突细胞是一种树突细胞.一个单细胞的单细胞.

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