Title |
Toll-Like Receptor 3 Signal in Dendritic Cells Benefits Cancer Immunotherapy
|
---|---|
Published in |
Frontiers in immunology, December 2017
|
DOI | 10.3389/fimmu.2017.01897 |
Pubmed ID | |
Authors |
Misako Matsumoto, Yohei Takeda, Megumi Tatematsu, Tsukasa Seya |
Abstract |
Pattern recognition receptors (PRRs) play a crucial role in the innate immune system and contribute to host defense against microbial infection. PRR-mediated antimicrobial signals provide robust type-I IFN/cytokine production and trigger inflammation, thereby affecting tumor progression and autoimmune diseases. Accumulating evidence demonstrates that among the PRRs, only the signaling pathway of endosomal toll-like receptor 3 (TLR3) induces no systemic inflammation and mediates cross-priming of antigen-specific CD8+ T cells by dendritic cells. Treatment with a newly developed TLR3-specific ligand, ARNAX, along with tumor-associated antigens (TAAs), induces tumor-specific cytotoxic T lymphocytes, modulates the tumor microenvironment to establish Th1-type antitumor immunity, and leads to tumor regression without inflammation in mouse tumor models. Combination therapy using ARNAX/TAA and PD-1/PD-L1 blockade potently enhances antitumor response and overcomes anti-PD-1/PD-L1 resistance. In this review, we will discuss the TLR3-mediated signaling in antitumor immunity and its application to cancer immunotherapy. |
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