Adoptive immunotherapy with transient anti-CD4 treatment enhances anti-tumor response by increasing IL-18Rαhi CD8+ T cells

Seon-Hee Kim, Eunjung Cho, Yu I. Kim, Chungyong Han (), Beom K. Choi () and Byoung S. Kwon ()
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Seon-Hee Kim: National Cancer Center
Eunjung Cho: National Cancer Center
Yu I. Kim: National Cancer Center
Chungyong Han: National Cancer Center
Beom K. Choi: National Cancer Center
Byoung S. Kwon: Eutilex Institute for Biomedical Research, Eutilex Co., Ltd

Nature Communications, 2021, vol. 12, issue 1, 1-15

Abstract: Abstract Adoptive T cell therapy (ACT) requires lymphodepletion preconditioning to eliminate immune-suppressive elements and enable efficient engraftment of adoptively transferred tumor-reactive T cells. As anti-CD4 monoclonal antibody depletes CD4+ immune-suppressive cells, the combination of anti-CD4 treatment and ACT has synergistic potential in cancer therapy. Here, we demonstrate a post-ACT conditioning regimen that involves transient anti-CD4 treatment (CD4post). Using murine melanoma, the combined effect of cyclophosphamide preconditioning (CTXpre), CD4post, and ex vivo primed tumor-reactive CD8+ T-cell infusion is presented. CTXpre/CD4post increases tumor suppression and host survival by accelerating the proliferation and differentiation of ex vivo primed CD8+ T cells and endogenous CD8+ T cells. Endogenous CD8+ T cells enhance effector profile and tumor-reactivity, indicating skewing of the TCR repertoire. Notably, enrichment of polyfunctional IL-18Rαhi CD8+ T cell subset is the key event in CTXpre/CD4post-induced tumor suppression. Mechanistically, the anti-tumor effect of IL-18Rαhi subset is mediated by IL-18 signaling and TCR–MHC I interaction. This study highlights the clinical relevance of CD4post in ACT and provides insights regarding the immunological nature of anti-CD4 treatment, which enhances anti-tumor response of CD8+ T cells.

Date: 2021
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DOI: 10.1038/s41467-021-25559-7

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