Title:Crosstalk Between Cancer-associated Fibroblasts and Myeloid Cells Shapes the Heterogeneous Microenvironment of Gastric Cancer
Volume: 25
Issue: 5
Author(s): Zhiwei Peng, Can Fang, Zhiwei Tong, Qiufan Rao, Zihao Ren and Kongwang Hu*
Affiliation:
- Department of General Surgery, First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
- Department of General Surgery, Fuyang Affiliated Hospital of Anhui Medical University, Fuyang, Anhui 236000, China
Keywords:
Single-cell sequencing, gastric cancer, cancer-associated fibroblasts, myeloid cells, tumor microenvironment, ligand-receptor pairs.
Abstract:
Background: Targeted therapies have improved the clinical outcomes of most patients
with cancer. However, the heterogeneity of gastric cancer remains a major hurdle for precision
treatment. Further investigations into tumor microenvironment heterogeneity are required to resolve
these problems.
Methods: In this study, bioinformatic analyses, including metabolism analysis, pathway enrichment,
differentiation trajectory inference, regulatory network construction, and survival analysis,
were applied to gain a comprehensive understanding of tumor microenvironment biology within
gastric cancer using single-cell RNA-seq and public datasets and experiments were carried out to
confirm the conclusions of these analyses.
Results: We profiled heterogeneous single-cell atlases and identified eight cell populations with
differential expression patterns. We identified two cancer-associated fibroblasts (CAFs) subtypes,
with particular emphasis on the role of inflammatory cancer-associated fibroblasts (iCAFs) in
EMT and lipid metabolic crosstalk within the tumor microenvironment. Notably, we detected two
differentiation states of iCAFs that existed in different tissues with discrepant expression of genes
involved in immuno-inflammation or ECM remodeling. Moreover, investigation of tumor-infiltrating
myeloid cells has revealed the functional diversity of myeloid cell lineages in gastric cancer.
Of which a proliferative cell lineage named C1QC+MKI67+TAMs was recognized with high immunosuppressive
capacities, suggesting it has immune suppression and cell proliferation functions
in the tumor niche. Finally, we explored regulatory networks based on ligand-receptor pairs and
found crucial pro-tumor crosstalk between CAFs and myeloid cells in the tumor microenvironment
(TME).
Conclusion: These findings provide insights for future cancer treatments and drug discovery.