Melanoma Cells Control Antimelanoma CTL Responses via Interaction between TIGIT and CD155 in the Effector Phase

The Journal of Investigative Dermatology
Takashi InozumeShinji Shimada

Abstract

Recently, T-cell immunoreceptor with Ig and ITIM domains (TIGIT) was reported as a candidate for novel immune checkpoints. However, the impact of TIGIT on melanoma-specific cytotoxic T lymphocytes in the effector phase remains unclear. In this study, we demonstrated that melanoma cells control antimelanoma cytotoxic T lymphocyte responses via the TIGIT-CD155 interaction in the effector phase. TIGIT is an inhibitory receptor expressed on T cells, and CD155 is one of the cognate ligands expressed on the tumor cells or antigen-presenting cells. First, we confirmed that CD155 was constitutively expressed on melanoma cells. We then demonstrated that CD155 on melanoma cells suppressed cytokine release from melanoma-specific cytotoxic T lymphocytes via interaction with TIGIT. Overexpression of CD155 enhanced and its downregulation attenuated the suppressive effect. This suggested that antimelanoma cytotoxic T lymphocyte responses are controlled not only by an imbalance in CD226 (an activating molecule that binds to CD155) and TIGIT expression on T cells but also by the expression levels of CD155 on melanoma cells. In addition, the co-blockade of TIGIT and PD-1 signals synergistically elicited a response of tumor-infiltrating lymphocyt...Continue Reading

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