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Cytotoxic CD4+ T cells in cancer: Expanding the immune effector toolbox
Open accessAbstract
Cytotoxic T cells are important effectors of anti-tumor immunity. While tumor killing is ascribed to CD8 + T cell function, pre-clinical and clinical studies have identified intra-tumoral CD4 + T cells that possess cytotoxic programs and can directly kill cancer cells. Cytotoxic CD4 + T cells are found in other disease settings including infection and autoimmunity. Here, we review the phenotypic and functional characteristics of cytotoxic CD4 + T cells in non-cancer and cancer contexts. We conduct a comparative examination of cytolytic mechanisms of cytotoxic CD4 + T cells across disease states and synthesize features that define these cells independent of context. We discuss regulatory mechanisms driving ontogeny and effector function and evidence for the clinical relevance of cytotoxic CD4 + T cells in cancer. In this context, we highlight important gaps in understanding in the biology of cytotoxic CD4 + T cells as well as the potential use of these cells in immunotherapies for specific cancers.
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“we observed a significant increase in the total CD4+ T cells expressing IFN-γ (figure 4H) and granzyme B (GZMB; figure 4J),60–65 NK cells (figure 4N), and the amount of GZMB expression in CD8+ T cells (figure 4L) in the post-cryoablated RMS 76-9STINGwt TME as compared with RMS 76-9STING-/- TME in wild-type mice, as was Foxp3+ CD4+ cells (figure 4M).”
From Functional tumor cell-intrinsic STING, not host STING, drives local and systemic antitumor immunity and therapy efficacy following cryoablation (2023) · cites this paper as [64]
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“CD4 T cells exert anti-tumor effects by elevating the level of killing insights of other effector cells within the environment [35, 36].”
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Ribonuclease 1 Enhances Antitumor Immunity against Breast Cancer by Boosting T cell Activation
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“Notably, pre-clinical and clinical studies have clarified the roles of cytotoxic CD4+ T cells in various human cancer types, including breast cancer, in which intra-tumoral CD4+ T cells that express cytolytic proteins, such as granzymes, can directly kill tumor cells independently of conventional CD8+ T cells [67].”
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“CD4 + T cells predominantly amplify CTLs anti-tumor activity through immune regulation but have also been found to possess direct cytotoxic capabilities in both preclinical and clinical studies, with cytotoxic CD4 + T cells identified in human cancer research [53–55].”
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“As an indispensable member of anti-tumor immunity, CD4 + T cells promote anti-tumor immunity by assisting CD8 effector T cells or directly eliminate tumor cells by acting as cytotoxic T cells (Oh and Fong, 2021).”
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TCF-1 Is Required for CD4 T Cell Persistence Functions during AlloImmunity
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“Previous investigation have revealed that CD4+ T cells not only express key molecules associated with cytolysis (such as Granzymes [GZM] and Perforin [PRF1]) but also possess direct cytotoxicity, forming the basis for their protective immunity, including in cancer (40).”
Background
Metadata
- Authors
- Oh, D. Y., & Fong, L.
- Affiliations
- University of California, San Francisco (US)
- Corresponding author
- Fong, Lawrence
- Venue
- Immunity
- Publisher
- Elsevier BV
- Published
- 2021-12
- Volume
- 54
- Issue
- 12
- Pages
- 2701-2711
- ISSN
- 1074-7613 (ISSN-L)
- PMC
- PMC8809482
- OpenAlex
- W4200244347
- Cited by
- 467
- References
- 73
- Citations by year
- 2026: 81 · 2025: 127 · 2024: 116 · 2023: 101 · 2022: 41 · 2021: 1
- FWCI
- 6.86
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Immunity (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion, cc-by)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- Funders
- NCI
- National Institutes of Health (K08AI139375)
- Prostate Cancer Foundation (R35CA253175)
- Bavarian Nordic
- Genentech
- Parker Institute for Cancer Immunotherapy
- AbbVie
- Amgen
- Merck
- Merck KGaA
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
- Keywords
- cytotoxic CD4+ T cells, antitumor immunity, cytotoxicity mechanism, cancer immunotherapy, infection, autoimmunity
- MeSH terms
- Animals, Cytotoxicity, Immunologic, Humans, Neoplasms, T-Lymphocytes, Cytotoxic, CD4-Positive T-Lymphocytes, Immunotherapy, Adoptive
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