American Association for Cancer Research
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Supplementary Fig. 1A from LILRB3 Supports Immunosuppressive Activity of Myeloid Cells and Tumor Development

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posted on 2024-03-04, 22:22 authored by Ryan Huang, Xiaoye Liu, Jaehyup Kim, Hui Deng, Mi Deng, Xun Gui, Heyu Chen, Guojin Wu, Wei Xiong, Jingjing Xie, Cheryl Lewis, Jade Homsi, Xing Yang, Chengcheng Zhang, Yubo He, Qi Lou, Caroline Smith, Samuel John, Ningyan Zhang, Zhiqiang An, Cheng Cheng Zhang

Supplementary Fig. 1A with figure legend

Funding

National Cancer Institute (NCI)

United States Department of Health and Human Services

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Cancer Prevention and Research Institute of Texas (CPRIT)

Welch Foundation (The Welch Foundation)

Leukemia and Lymphoma Society (LLS)

Immune-Onc Therapeutics, Inc.

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ARTICLE ABSTRACT

The existing T cell–centered immune checkpoint blockade therapies have been successful in treating some but not all patients with cancer. Immunosuppressive myeloid cells, including myeloid-derived suppressor cells (MDSC), that inhibit antitumor immunity and support multiple steps of tumor development are recognized as one of the major obstacles in cancer treatment. Leukocyte Ig-like receptor subfamily B3 (LILRB3), an immune inhibitory receptor containing tyrosine-based inhibitory motifs (ITIM), is expressed solely on myeloid cells. However, it is unknown whether LILRB3 is a critical checkpoint receptor in regulating the activity of immunosuppressive myeloid cells, and whether LILRB3 signaling can be blocked to activate the immune system to treat solid tumors. Here, we report that galectin-4 and galectin-7 induce activation of LILRB3 and that LILRB3 is functionally expressed on immunosuppressive myeloid cells. In some samples from patients with solid cancers, blockade of LILRB3 signaling by an antagonistic antibody inhibited the activity of immunosuppressive myeloid cells. Anti-LILRB3 also impeded tumor development in myeloid-specific LILRB3 transgenic mice through a T cell–dependent manner. LILRB3 blockade may prove to be a novel approach for immunotherapy of solid cancers.

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