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Spatially distinct reprogramming of the tumor microenvironment based on tumor invasion in diffuse-type gastric cancers

ABSTRACT: Spatially distinct reprogramming of the tumor microenvironment based on tumor invasion in diffuse-type gastric cancers

PROVIDER: PRJNA704101 | ENA |

REPOSITORIES: ENA

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Spatially distinct reprogramming of the tumor microenvironment based on tumor invasion in diffuse-type gastric cancers

Project description:The invasive potential of gastric cancers (GCs) defines the hallmarks of malignancies; however, the cellular components and their molecular features associated with tumor invasiveness in GC microenvironments (TME) are poorly understood. In this study, we constructed a comprehensive atlas of 23,060 single cells obtained from surgically dissected superficial and deep layers of five diffuse-type GC along with matched normal. As a result, seven major cell types were identified. Fibroblasts, endothelial cells, and myeloid cells were categorized as being enriched in the deep layers. Cell type-specific clustering further revealed that the superficial-to-deep layer transition is associated with enrichment in inflammatory endothelial cells and fibroblasts with upregulated CCL2 transcripts. This study reveals the spatial reprogramming of the TME that may underlie invasive tumor potential in diffuse-type GC. This TME profiling across tumor layers suggests new targets, such as CCL2, that can modify the TME to inhibit tumor progression in diffuse-type GC.

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Expression data from intestinal-type and diffuse-type gastric cancers

Project description:To identify the specific genes for intestinal-type and diffuse-type gastric cancers. We selected 18 intestinal-type gastric cancers and 12 diffuse-type gastric cancers showing typical characteristics on the form of cell growth (clustered or scattered) and the degree of differentiation (well/moderate or poor), and performed microarray analysis for obtaining genome-wide mRNA expression profiles.

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Project description:Here we present a dataset from 84 DGC patients with paired tumor and nearby tissue. Tumors and their nearby tissues were evaluated by pathologists. Nearby tissues were designated as non-cancerous and were greater than 5 cm away from the surgery margin. Hematoxylin and eosin (H&E) stained sections were examined by two expert gastrointestinal pathologists (Z.L. and Yumei Lai) independently to confirm: (1) diffuse type (Lauren type); (2) >50% tumor cell nuclei; (3) <20% necrosis in tumor tissue; (4) no tumor cells in nearby tissue.

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