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  • CD4+ T cell exhaustion leads to adoptive transfer therapy failure which can be prevented by immune checkpoint blockade.

CD4+ T cell exhaustion leads to adoptive transfer therapy failure which can be prevented by immune checkpoint blockade.

American journal of cancer research (2021-01-09)
Jinfei Fu, Anze Yu, Xiang Xiao, Juyu Tang, Xiongbing Zu, Wenhao Chen, Bin He
ABSTRACT

Cytotoxic CD8+ T cell exhaustion is one of the mechanisms underlying the tumor immune escape. The paradigm-shifting immune checkpoint therapy can mitigate CD8+ T lymphocyte exhaustion, reinvigorate the anticancer immunity, and achieve durable tumor regression for some patients. Emerging evidence indicates that CD4+ T lymphocytes also have a critical role in anticancer immunity, either by directly applying cytotoxicity toward cancer cells or as a helper to augment CD8+ T cell cytotoxicity. Whether anticancer CD4+ T lymphocytes undergo exhaustion during immunotherapy of solid tumors remains unknown. Here we report that melanoma antigen TRP-1/gp75-specific CD4+ T lymphocytes exhibit an exhaustion phenotype after being adoptively transferred into mice bearing large subcutaneous melanoma. Exhaustion of these CD4+ T lymphocytes is accompanied with reduced cytokine release and increased expression of inhibitory receptors, resulting in loss of tumor control. Importantly, we demonstrate that PD-L1 immune checkpoint blockade can prevent exhaustion, induce proliferation of the CD4+ T lymphocytes, and consequently prevent tumor recurrence. Therefore, when encountering an excessive amount of tumor antigens, tumor-reactive CD4+ T lymphocytes also enter the exhaustion state, which can be prevented by immune checkpoint blockade. Our results highlight the importance of tumor-specific CD4+ T lymphocytes in antitumor immunity and suggest that the current immune checkpoint blockade therapy may achieve durable anticancer efficacy by rejuvenating both tumor antigen-specific CD8+ T lymphocytes and CD4+ T lymphocytes.

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Product Description

Sigma-Aldrich
Collagenase type I, The collagenase type I (from Clostridium histolyticum) is a crude collagenase preparation that can be used for the isolation of primary cells or for tissue dissociation by enzymatic means.
Sigma-Aldrich
RPMI-1640 Medium, With L-glutamine, without sodium bicarbonate, powder, suitable for cell culture