Abstract
The immunogenic cell death (ICD) is a specific type of regulatory cell death (RCD), which induces adaptive immunity against antigens of dead cells. ICDs have received increasing attention for their potential role in tumor microenvironment reprogramming and immunotherapy. However, the relationship between ICD-related features and stomach adenocarcinoma (STAD) prognosis, immune cell infiltration and immunotherapy remains unclear. Patients were divided into different ICD-related subtypes by consensus clustering. The differences in prognosis, Tumor microenvironment (TME), and immune checkpoint expression between different ICD-related subtypes were systematically assessed. Additionally, we constructed an ICD-related gene risk score (ICDRS). We systematically analyzed the correlation between ICDRS and prognosis, TME, immunotherapy response and drug sensitivity of gastric cancer. In addition, we explored the role of TGM2 in promoting gastric cancer progression through in vitro experiments. We identified three ICD-associated subtypes by consensus clustering. The ICD gene was highly expressed in Cluster B. Compared with the other two subtypes, Cluster B had better prognosis, higher immune response signaling activity, massive immune cell infiltration and lower tumor purity. Immune checkpoint (ICP) and human leukocyte antigen (HLA) related genes were also highly expressed in Cluster B. In addition, we found that ICDRS is an effective indicator for predicting the prognosis and immune efficacy of STAD. The low ICDRS group has the characteristics of good prognosis, high tumor mutation burden (TMB), high microsatellite instability (MSI), and sensitivity to immunotherapy, while the high ICDRS group is prone to immune escape and immunotherapy resistance. In addition, we found that down-regulating TGM2 gene can inhibit the proliferation and migration of gastric cancer cells through in vitro experiments. Our study found that the model based on ICD features is helpful to clarify the TME characteristics of STAD, and has important clinical significance for evaluating the prognosis and immunotherapy response of STAD patients. TGM2 plays an important role in the progression of STAD, suggesting that TGM2 can be used as a new target for the treatment of STAD.
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Data availability
The datasets analyzed during the current study are available at TCGA-STAD [GDC (GDC (cancer.gov)], GSE84437 [GEO Accession viewer (nih.gov)] and Supplementary Materials.
Abbreviations
- ICD:
-
Immunogenic cell death
- RCD:
-
Regulatory cell death
- TME:
-
Tumor microenvironment
- STAD:
-
Stomach adenocarcinoma
- GC:
-
Gastric cancer
- ICDRS:
-
ICD-related gene risk score
- TMB:
-
Tumor mutation burden
- MSI:
-
Microsatellite instability
- ICIs:
-
Immune checkpoint inhibitors
- DAMPs:
-
Damage-associated molecular patterns
- TCGA:
-
The Cancer Genome Atlas
- GEO:
-
Gene Expression Omnibus
- GSVA:
-
Gene set variation analysis
- ssGSEA:
-
Single-sample gene set enrichment analysis
- DEGs:
-
Differentially expressed genes
- OS:
-
Overall survival time
- TIDE:
-
Tumor immune dysfunction and exclusion
- ImmuCellIA:
-
Abundance of immune cell infiltrates
- RNAss:
-
RNA stemness score
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Acknowledgements
We would like to express our appreciation to TCGA-STAD [GDC (cancer.gov)] and GEO databases (https://www.ncbi.nlm.nih.gov/geo/) for providing the open-access databases utilized in this research study.
Funding
This research was funded by the Project of the Jiangxi Provincial Education Department of Science and Technology Research (Grant Number: GJJ2200234).
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ZTL, LS and XYP conceived and designed the study, CH and SCL collected the data and clinical specimens. ZTL and LS analyzed the data, searched the literature and evaluated the quality. ZMZ, ZTL, and CH prepared the first draft of the manuscript and corrected it. All the authors have read the manuscript and agreed to the final version of the manuscript.
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Liu, Z., Sun, L., Peng, X. et al. An immunogenic cell death-related signature predicts prognosis and immunotherapy response in stomach adenocarcinoma. Apoptosis 28, 1564–1583 (2023). https://doi.org/10.1007/s10495-023-01879-5
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DOI: https://doi.org/10.1007/s10495-023-01879-5