LILRB3 Supports Immunosuppressive Activity of Myeloid Cells and Tumor Development
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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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Patient-derived MDSCs suppressed the proliferation and function of autologous T cells in a coculture system.
“As expected, patient-derived MDSCs suppressed the proliferation and function of autologous T cells in a coculture system (Fig. 3c–e and Supplementary Fig. 5b), which is consistent with their known immunosuppressive activity31,32.”
From Oligomeric cystatin C supports the immunosuppressive activity of myeloid cells through interaction with inhibitory receptors (2025) · cites this paper as [32]
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Zhang, C., He, Y., Liu, X., Xie, J., Fang, M., Yang, X., Huang, R., Lou, Q., Li, B., Gupta, A., et al. (2025) · Signal Transduction and Targeted Therapy · doi:10.1038/s41392-025-02462-x · Cited by 2 · see citing works
Self-citation
- Authors
- Huang, R., Liu, X., Kim, J., Deng, H., Deng, M., Gui, X., Chen, H., Wu, G., Xiong, W., Xie, J., Lewis, C., Homsi, J., Yang, X., Zhang, C., He, Y., Lou, Q., Smith, C., John, S., Zhang, N., An, Z., & Zhang, C. C.
- Affiliations
- The University of Texas Southwestern Medical Center (US)
- Brown Foundation Institute of Molecular Medicine for the Prevention of Human Diseases (US)
- Harold C. Simmons Comprehensive Cancer Center (US)
- 1Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas.
- ORCID
- Venue
- Cancer Immunology Research
- Published
- 2023-12-19
- Volume
- 12
- Issue
- 3
- Pages
- 350-362
- ISSN
- 2326-6066 (ISSN-L)
- 2326-6074
- PMC
- PMC10932818
- OpenAlex
- W4389935829
- Cited by
- 24
- References
- 2
- Citations by year
- 2026: 7 · 2025: 9 · 2024: 8
- FWCI
- 2.93
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Cancer Immunology Research (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Digital Commons-TMC (Texas Medical Center) (submittedVersion)
- Funders
- National Cancer Institute (R01CA248736, R01CA263079, 5P30CA142543, Lung Cancer SPORE Development Research Program at UT Southwestern)
- Cancer Prevention and Research Institute of Texas (RP220032, RP15150551, RP190561)
- Welch Foundation (AU-0042-20030616)
- Leukemia and Lymphoma Society (6629-21)
- Immune-Onc Therapeutics, Inc. (Sponsored Research Grant #111077)
- Topics
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
- Life Sciences › Immunology and Microbiology › Immunology › Galectins and Cancer Biology
- Keywords
- LILRB3, immunosuppressive myeloid cells, myeloid-derived suppressor cells, galectin-4, galectin-7, immune checkpoint blockade, carcinogenesis, solid tumors, T cell-dependent immunity, cancer immunotherapy
- MeSH terms
- Myeloid-Derived Suppressor Cells, Animals, Humans, Neoplasms, Receptors, Immunologic, T-Lymphocytes, Antigens, CD, Myeloid Cells, Mice, Tumor Microenvironment
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