Department of Colorectal Surgery, Harbin Medical University Cancer Hospital, Harbin, 150086, China.
School of Life Science and Technology, Harbin Institute of Technology, Harbin, 150080, China.
J Transl Med. 2023 Nov 8;21(1):794. doi: 10.1186/s12967-023-04600-x.
The occurrence and progression of tumors can be established through a complex interplay among tumor cells undergoing epithelial-mesenchymal transition (EMT), invasive factors and immune cells. In this study, we employed single-cell RNA sequencing (scRNA-seq) and spatially resolved transcriptomics (ST) to evaluate the pseudotime trajectory and spatial interactive relationship between EMT-invasive malignant tumors and immune cells in primary colorectal cancer (CRC) tissues at different stages (stage I/II and stage III with tumor deposit). Our research characterized the spatiotemporal relationship among different invasive tumor programs by constructing pseudotime endpoint-EMT-invasion tumor programs (EMTPs) located at the edge of ST, utilizing evolution trajectory analysis integrated with EMT-invasion genes. Strikingly, the invasive and expansive process of tumors undergoes remarkable spatial reprogramming of regulatory and immunosuppressive cells, such as myeloid-derived suppressor cells (MDSCs), tumor-associated macrophages (TAMs), regulatory T cells (Treg), and exhausted T cells (Tex). These EMTP-adjacent cell are linked to EMT-related invasion genes, especially the C-X-C motif ligand 1 (CXCL1) and CXCL8 genes that are important for CRC prognosis. Interestingly, the EMTPs in stage I mainly produce an inflammatory margin invasive niche, while the EMTPs in stage III tissues likely produce a hypoxic pre-invasive niche. Our data demonstrate the crucial role of regulatory and immunosuppressive cells in tumor formation and progression of CRC. This study provides a framework to delineate the spatiotemporal invasive niche in CRC samples.
肿瘤的发生和发展可以通过经历上皮-间充质转化 (EMT) 的肿瘤细胞、侵袭因子和免疫细胞之间的复杂相互作用来建立。在这项研究中,我们采用单细胞 RNA 测序 (scRNA-seq) 和空间分辨转录组学 (ST) 来评估 EMT-侵袭性恶性肿瘤和不同阶段(I/II 期和有肿瘤沉积的 III 期)原发性结直肠癌 (CRC) 组织中免疫细胞之间的伪时间轨迹和空间相互作用关系。我们通过构建位于 ST 边缘的伪时间终点-EMT-侵袭性肿瘤程序 (EMTP),利用进化轨迹分析与 EMT-侵袭性基因相结合,对不同侵袭性肿瘤程序的时空关系进行了特征描述。引人注目的是,肿瘤的侵袭和扩张过程经历了调节性和免疫抑制性细胞(如髓系来源的抑制细胞 (MDSCs)、肿瘤相关巨噬细胞 (TAMs)、调节性 T 细胞 (Treg) 和耗竭性 T 细胞 (Tex))的显著空间重编程。这些 EMTP 相邻细胞与 EMT 相关的侵袭基因相关,特别是对 CRC 预后很重要的 C-X-C 基序配体 1 (CXCL1) 和 CXCL8 基因。有趣的是,I 期的 EMTP 主要产生炎症性边缘侵袭性生态位,而 III 期组织中的 EMTP 可能产生缺氧前侵袭性生态位。我们的数据表明调节性和免疫抑制性细胞在 CRC 的形成和发展中起着关键作用。本研究为描绘 CRC 样本中的时空侵袭生态位提供了一个框架。
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