An oncolytic virus delivering tumor-irrelevant bystander T cell epitopes induces anti-tumor immunity and potentiates cancer immunotherapy
Open accessAbstract
Tumor-specific T cells are crucial in anti-tumor immunity and act as targets for cancer immunotherapies. However, these cells are numerically scarce and functionally exhausted in the tumor microenvironment (TME), leading to inefficacious immunotherapies in most patients with cancer. By contrast, emerging evidence suggested that tumor-irrelevant bystander T (T BYS) cells are abundant and preserve functional memory properties in the TME. To leverage T BYS cells in the TME to eliminate tumor cells, we engineered oncolytic virus (OV) encoding T BYS epitopes (OV-BYTE) to redirect the antigen specificity of tumor cells to pre-existing T BYS cells, leading to effective tumor inhibition in multiple preclinical models. Mechanistically, OV-BYTE induced epitope spreading of tumor antigens to elicit more diverse tumor-specific T cell responses. Remarkably, the OV-BYTE strategy targeting human severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific T cell memory efficiently inhibited tumor progression in a human tumor cell-derived xenograft model, providing important insights into the improvement of cancer immunotherapies in a large population with a history of SARS-CoV-2 infection or coronavirus disease 2019 (COVID-19) vaccination.
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A recent mouse study reports the anti-tumor activities of pre-existing virus-specific Tem cells.
“A recent mouse study reports the anti-tumor activities of pre-existing virus-specific Tem cells.81”
From Contrasting cytotoxic and regulatory T cell responses underlying distinct clinical outcomes to anti-PD-1 plus lenvatinib therapy in cancer (2025) · cites this paper as [81]
The Results section (‘OV-BYTE promotes in situ TBYS cells to restrain tumor growth’; page unavailable) reports better tumor control in mice whose tumors contained pre-existing LCMV-specific T cells. This supports the anti-tumor activity of pre-existing virus-specific memory T cells, but the paper does not identify those cells specifically as effector-memory (Tem) cells. (LLM, conf=0.82)
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- Authors
- Chen, X., Zhao, J., Yue, S., Li, Z., Duan, X., Lin, Y., Yang, Y., He, J., Gao, L., Pan, Z., Yang, X., Su, X., Huang, M., Li, X., Zhao, Y., Zhang, X., Li, Z., Hu, L., Tang, J., Hao, Y., Tian, Q., Wang, Y., Xu, L., Huang, Q., Cao, Y., Chen, Y., Zhu, B., Li, Y., Bai, F., Zhang, G., & Ye, L.
- Affiliations
- Changping Laboratory (CN)
- China Agricultural University (CN)
- Army Medical University (CN)
- Model Animal Research Center (CN)
- Southern Medical University (CN)
- Chongqing Medical University (CN)
- Chongqing Public Health Medical Center (CN)
- Peking University (CN)
- Corresponding author
- Li, Yan
- Bai, Fan
- Zhang, Guozhong
- Ye, Lilin
- ORCID
- Venue
- Nature Cancer
- Published
- 2024-04-12
- Volume
- 5
- Issue
- 7
- Pages
- 1063-1081
- ISSN
- 2662-1347 (ISSN-L)
- PMC
- PMC11286533
- OpenAlex
- W4394752969
- Cited by
- 68
- References
- 64
- Citations by year
- 2026: 25 · 2025: 37 · 2024: 6
- FWCI
- 11.37
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Nature Cancer (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Greater South Information System
- Funders
- National Natural Science Foundation of China (32070942, 32300785)
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Keywords
- oncolytic viruses, bystander T cells, epitope spreading, tumor-specific T cells, tumor microenvironment, T cell exhaustion, cancer immunotherapy, SARS-CoV-2-specific T cells, COVID-19 vaccination, tumor xenografts
- MeSH terms
- COVID-19, SARS-CoV-2, Animals, Antigens, Neoplasm, Female, Humans, Immunotherapy, Neoplasms, T-Lymphocytes, Epitopes, T-Lymphocyte, Xenograft Model Antitumor Assays, Cell Line, Tumor, Oncolytic Virotherapy, Oncolytic Viruses, Mice, Tumor Microenvironment
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