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纤维细胞表观基因组是突肉瘤中SS18::SSX介导的转变的基础
Lesley A Hill1,2, R Wilder Scott1,2, Lauren A Martin1,2
1Biomedical Research Centre, Vancouver, BC, Canada.
Nature communications
|December 2, 2025
概括
研究人员确定了突肉瘤 (SyS) 罕见的中细胞 stromal 细胞 (MSC) 起源. SS18::SSX融合瘤基因通过揭露胚胎MSC程序来驱动SyS,从而导致瘤的发展.
科学领域:
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 突肉瘤 (SyS) 是一种具有攻击性的软组织癌症,其特征是SS18::SSX融合瘤基因.
- 尽管在了解其生物学方面取得了进展,但SyS的确切细胞起源仍然难以捉摸.
- 确定细胞起源对于开发针对性治疗SyS至关重要.
研究的目的:
- 为了基因定义突肉瘤的细胞起源.
- 阐明SS18::SSX瘤基因驱动转变的分子机制.
- 了解介质细胞 (MSCs) 在SyS瘤发生中的作用.
主要方法:
- 利用一个特定于介质细胞 (MSC) 的CreERT2小鼠模型来表达SS18::SSX瘤基因.
- 进行了组织学和分子分析,以比较小鼠瘤与人类的SyS亚型.
- 进行了比较性转录组分析和表观遗传分析 (基因组标记),以确定转化过程中的分子变化.
主要成果:
- 在小鼠中表现出100%的透性SyS发育,中位延迟时间为16.2周.
- 确定了一种罕见的Hic1+,Pdgfra+,Lgr5+纤维细胞群作为SyS的源细胞.
- 揭示SS18::SSX转变涉及成熟纤维细胞身份的丧失和胚胎MSC程序的揭露,标志着H3K27me3损失.
结论:
- 突肉瘤起源于MSCs的一个罕见亚群.
- SS18:SSX瘤基因通过重新激活一个类似胚胎的MSC表型来诱导转变.
- 这些发现提供了对SyS病原体和潜在治疗点的关键见解.
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