纤维细胞分泌的小型细胞外囊泡通过BMP4/BMPR2/Smad信号传递驱动巨细胞M2极化
Chenyang Zhang1, Si Chen1, Chenghui Qian1
1Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, Minhang, Shanghai 201102, P.R. China.
Oncology reports
|February 6, 2026
概括
癌相关纤维细胞 (CAFs) 具有高POSTN表达,在头癌中促进免疫抑制. 阳性CAF驱动M2巨细胞的两极分化,有助于抵抗免疫检查点阻塞疗法.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
背景情况:
- 与癌症相关的纤维细胞 (CAF) 是异质的,并且与头部和部状细胞癌 (HNSCC) 的免疫检查点阻断 (ICB) 抵抗有关.
- 特定的CAF亚型及其在ICB耐药性中的机制需要进一步研究.
研究的目的:
- 在HNSCC中识别不同的CAF亚型.
- 阐明素 (POSTN) 在CAF介导的免疫抑制和ICB抵抗中的作用.
主要方法:
- 对单细胞RNA测序数据集 (GSE103322,GSE139324) 和癌症基因组图谱 (TCGA) -HNSCC数据的分析.
- 基于POSTN表达的纤维细胞亚型的识别.
- 免疫黄金标签和小细胞外囊泡 (sEVs) 的评估.
- 研究巨细胞两极分化和BMP信号通路.
主要成果:
- 确定了两种CAF亚型,即POSTN阴性和POSTN阳性.
- POSTN+ CAFs显示出细胞外矩阵标记物的高表达.
- POSTN表达与巨细胞透相关,并预测了ICB抗性.
- POSTN+ sEVs通过BMP受体2/Smad通路促进了M2巨细胞的极化.
- 在CAF中,POSTN knockdown通过降低巨细胞中的BMP4表达来减少M2极化.
结论:
- POSTN+纤维细胞通过sEV介导的巨细胞两极分化,创造一个免疫抑制的瘤微环境.
- POSTN是一种潜在的治疗点,可以提高HNSCC的ICB疗效.
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