胰腺癌衍生的细胞外囊的差异性影响驱动压制性环境
Anurag Purushothaman1,2, Jacqueline Oliva-Ramírez1, Warapen Treekitkarnmongkol1
1Department of Translational Molecular Pathology, MD Anderson Cancer Center, Houston, TX 77030, USA.
International journal of molecular sciences
|October 14, 2023
概括
胰腺癌细胞释放出影响免疫细胞和纤维细胞的囊泡. 这些囊泡中的氨酸 (HA) 影响免疫抑制和亲瘤原因子释放,表明治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 细胞外囊泡 细胞外囊泡
背景情况:
- 胰腺管腺癌 (PDAC) 细胞与其微环境广泛相互作用.
- 小型细胞外囊泡 (sEVs) 在PDAC中调解细胞间通信,影响瘤进展.
- 癌症相关纤维细胞 (CAFs) 在PDAC的复杂细胞交叉声中发挥作用.
研究的目的:
- 调查PDAC衍生的sEVs对单细胞系转换和免疫标记物表达的影响.
- 分析与sEV相关的氨酸 (HA) 在免疫调节和纤维细胞激活中的作用.
- 探索针对PDAC中HA合成的潜在治疗策略.
主要方法:
- 来自健康捐赠者的外周血液单细胞暴露在PDAC衍生的sEV中.
- 单细胞和胰腺恒星细胞 (PSC) 用PDACsEV培养,有或没有HA.
- 对免疫细胞表型,细胞因子分泌和T细胞增殖抑制的分析.
- 与TCGA数据库发现的HA合成途径酶和患者存活率的相关性.
主要成果:
- PDAC sEVs诱导了单细胞标记物 (HLA-DR,PD-L1,CD86,CD64) 和细胞因子分泌 (HA-独立,除IL-1β,MIP1β外) 的表型变化.
- 暴露于低HA的sEVs减少了单细胞介导的自身T细胞增殖的抑制.
- PDAC sEVs从PSC上调调节了来自PSC的亲瘤原生细胞因子MMP-9分泌;HA的减少减弱了这种效应.
- 在PDAC患者中HA合成酶的高表达与更差的生存率相关.
结论:
- 由PDAC衍生的sEVs调节免疫细胞激活和纤维细胞的行为.
- 与sEV相关的HA影响细胞因子分泌,T细胞抑制,以及PSCs释放的亲瘤原因子.
- 针对赫索胺生物合成途径以抑制HA合成,为PDAC提供了一个潜在的临床策略.
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