Integrating Single-cell and Spatial Analysis Reveals MUC1-mediated Cellular Crosstalk in Mucinous Colorectal Adenocarcinoma

Overview

Journal Clin Transl Med

Publisher Wiley

Specialty General Medicine

Date 2024 May 23

PMID 38778448

Authors

Haiyang Zhou

Yiwen Shen

Guangyong Zheng

Beibei Zhang

Anqi Wang

Jing Zhang

Hao Hu

Jiayi Lin

Sanhong Liu

Xin Luan

Weidong Zhang

Affiliations

Soon will be listed here.

Abstract

Background: Mucinous colorectal adenocarcinoma (MCA) is a distinct subtype of colorectal cancer (CRC) with the most aggressive pattern, but effective treatment of MCA remains a challenge due to its vague pathological characteristics. An in-depth understanding of transcriptional dynamics at the cellular level is critical for developing specialised MCA treatment strategies.

Methods: We integrated single-cell RNA sequencing and spatial transcriptomics data to systematically profile the MCA tumor microenvironment (TME), particularly the interactome of stromal and immune cells. In addition, a three-dimensional bioprinting technique, canonical ex vivo co-culture system, and immunofluorescence staining were further applied to validate the cellular communication networks within the TME.

Results: This study identified the crucial intercellular interactions that engaged in MCA pathogenesis. We found the increased infiltration of FGF7/THBS1 myofibroblasts in MCA tissues with decreased expression of genes associated with leukocyte-mediated immunity and T cell activation, suggesting a crucial role of these cells in regulating the immunosuppressive TME. In addition, MS4A4A macrophages that exhibit M2-phenotype were enriched in the tumoral niche and high expression of MS4A4A was associated with poor prognosis in the cohort data. The ligand-receptor-based intercellular communication analysis revealed the tight interaction of MUC1 malignant cells and ZEB1 endothelial cells, providing mechanistic information for MCA angiogenesis and molecular targets for subsequent translational applications.

Conclusions: Our study provides novel insights into communications among tumour cells with stromal and immune cells that are significantly enriched in the TME during MCA progression, presenting potential prognostic biomarkers and therapeutic strategies for MCA.

Key Points: Tumour microenvironment profiling of MCA is developed. MUC1 tumour cells interplay with FGF7/THBS1 myofibroblasts to promote MCA development. MS4A4A macrophages exhibit M2 phenotype in MCA. ZEB1 endotheliocytes engage in EndMT process in MCA.

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