瘤微环境中的调节性T细胞表现出独特的染色质可访问性概况
Rebekah E Dadey1,2,3, Jian Cui1,2, Dhivyaa Rajasundaram4
1Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.
ImmunoHorizons
|February 18, 2025
概括
调节性T细胞 (Tregs) 在瘤微环境 (TME) 中表现出独特的染色质可访问性特征,与外围Tregs不同. 尽管瘤进展或抗PD-1免疫疗法,但该概况仍然稳定.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 调控性T细胞 (Tregs) 是重要的CD4+T细胞抑制剂,阻碍抗瘤免疫反应.
- 了解瘤微环境 (TME) 中的Treg功能是开发有效癌症免疫疗法的关键.
研究的目的:
- 为了研究Tregs在小鼠TME中的染色质可访问性景观.
- 确定Tregs中的瘤特异性可访问的染色体区域,并评估它们随时间的推移和抗PD-1免疫治疗的动态.
主要方法:
- 在小鼠B16和MC38瘤模型中使用ATAC-seq对Treg染色质可访问性的分析.
- 在TME中的Treg染色质可访问性与外围部位的比较.
- 在抗PD-1治疗后对Treg转录和染色质可访问性变化的评估.
主要成果:
- 与外围Tregs相比,TME中的Tregs显示出一个独特的染色质可访问性签名.
- 这种特征的特点是,与CD4+常规T细胞效应器功能相关的位点的可访问性降低.
- 随着时间的推移和抗PD-1 免疫治疗后,Treg 染色体的可访问性和转录组基本保持不变.
- 皮肤居民瘤中的Tregs与天真皮居民Tregs有相似之处,但保留了TME特异性差异.
结论:
- 对于Tregs来说,TME形成了一个独特的,尽管稳定的染色质可访问性概况.
- 瘤中的Treg染色体可访问性在不同瘤类型,时间点和对免疫治疗的反应中非常一致.
- 这些发现表明Tregs具有稳定的,适应TME的表观遗传状态,可以抵抗免疫疗法诱导的调制.
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