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CD4+ cytotoxic T cells: an emerging effector arm of anti-tumor immunity

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BMB REPORTS
卷 56, 期 3, 页码 140-144

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KOREAN SOCIETY BIOCHEMISTRY & MOLECULAR BIOLOGY
DOI: 10.5483/BMBRep.2023-0014

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Anti-tumor immunity; Cancer immunotherapy; CD4(+) cy-totoxic T cells; CD4(+) helper T cells; MHC-II antigen presentation

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While CD8+ cytotoxic T cells have traditionally been considered the main drivers of tumor control, the role of CD4+ helper T cells in anti-tumor immunity has been underestimated. Recent studies on intra-tumoral T cells using genomic technologies have led to a reassessment of CD4+ T cells' indirect helper role. Accumulating evidence suggests that CD4+ T cells can directly kill tumor cells in a MHC-II-dependent manner, highlighting their potentially critical contribution to immune responses against a wide range of tumor types.
While CD8+ cytotoxic T cells have long been considered the primary effector in controlling tumors, the involvement of CD4+ helper T cells in anti-tumor immunity has been underappreciated. The investigations of intra-tumoral T cells, fueled by the recent advances in genomic technologies, have led to a rethinking of the indirect role of CD4+ T cells that have traditionally been described as a helper. Accumulating evidence from preclinical and clinical studies indicates that CD4+ T cells can acquire intrinsic cytotoxic properties and directly kill various types of tumor cells in a major histocompatibility complex class II (MHC-II)-dependent manner, as opposed to the indirect helper function, thus underscoring a potentially critical contribution of CD4+ cytotoxic T cells to immune responses against a wide range of tumor types. Here, we discuss the biological properties of anti-tumor CD4+ T cells with cytotoxic capability and highlight the emerging observations suggesting their more significant role in anti-tumor immunity than previously appreciated. [BMB Reports 2023; 56(3): 140-144]

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