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Updated: Sep 11, 2025
Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells
Published on: March 7, 2025
Essential Role of NLRC5 in Cancer Immune Surveillance and Cancer Immunoediting
Akhil Shukla1, Anny Armas Cayarga1, Jean-François Lucier2
1Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada.
Abstract:
A key mechanism of tumour immune escape from CD8+ cytotoxic T lymphocytes occurs via downregulation of NLRC5, an IFNγ-induced transcriptional activator of MHC class-I. As NLRC5 deficiency does not abrogate CD8+ T cell development, we investigated whether NLRC5-dependent antitumour immune mechanisms are required for immune surveillance. We studied the development of 3-methylcholanthrene (MCA)-induced endogenous fibrosarcoma in Nlrc5-/- mice with Nlrc5+/+ and Rag1-/- mice serving as controls. Nlrc5-/- and Rag1-/- mice showed increased propensity to develop MCA-induced tumours with a higher growth rate compared to Nlrc5+/+ mice and displayed significantly reduced survival. Tumours from Nlrc5+/+ and Nlrc5-/- mice, but not from Rag1-/- mice, contained necrotic areas and displayed T cell infiltration. Tumour cell lines established from MCA-induced tumours were evaluated for their sensitivity to immune-mediated growth control following implantation into immunocompetent C57BL/6 and immunodeficient Rag1-/- hosts. Tumours formed by Nlrc5+/+ tumour cell lines progressed unhindered in C57BL/6 hosts that reflected their immunoedited status, whereas cell lines from Nlrc5-/- and Rag1-/- tumours were efficiently controlled, indicating their non-immunoedited status. Proteomic analysis by mass spectrometry followed by pathway analysis revealed enrichment of granzyme-mediated cytolytic pathway in Nlrc5+/+ tumours that were absent in Nlrc5-/- tumours, which showed enrichment of humoral and innate immune pathways. Overall, our findings show that NLRC5 is required for robust tumour immune surveillance and tumour immunoediting and that compensatory humoral and innate immune mechanisms activated by the loss of NLRC5 are insufficient for cancer immune surveillance and cancer immunoediting.
Insights
NLRC5 is crucial for anti-tumor immunity and immune surveillance. Its absence impairs the immune system's ability to control cancer growth, highlighting NLRC5's role in tumor immunoediting.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Tumor immune escape involves NLRC5 downregulation, affecting CD8+ T cell activity.
- NLRC5 is an IFNγ-induced activator of MHC class-I, critical for anti-tumor immunity.
- NLRC5 deficiency does not impede CD8+ T cell development, prompting investigation into its immune surveillance role.
Purpose of the Study:
- To investigate the role of NLRC5-dependent mechanisms in anti-tumor immune surveillance.
- To determine if NLRC5 is required for tumor immunoediting.
- To compare tumor development and immune responses in mice with and without NLRC5.
Main Methods:
- Studied 3-methylcholanthrene (MCA)-induced fibrosarcoma development in Nlrc5-/- mice, Nlrc5+/+ mice, and Rag1-/- mice.
- Assessed tumor growth rate, survival, and T cell infiltration.
- Evaluated tumor cell line sensitivity to immune-mediated control in C57BL/6 and Rag1-/- hosts.
- Performed proteomic analysis using mass spectrometry and pathway analysis.
Main Results:
- Nlrc5-/- and Rag1-/- mice exhibited increased tumor incidence, faster growth, and reduced survival compared to Nlrc5+/+ mice.
- Tumors from Nlrc5-/- mice showed altered immune cell infiltration and lacked granzyme-mediated cytotoxicity pathways.
- Tumor cell lines from Nlrc5-/- and Rag1-/- mice were efficiently controlled in immunocompetent hosts, indicating a non-immunoedited status.
- Proteomic analysis revealed enrichment of humoral and innate immune pathways in Nlrc5-/- tumors, contrasting with the granzyme pathway in Nlrc5+/+ tumors.
Conclusions:
- NLRC5 is essential for effective tumor immune surveillance and immunoediting.
- Compensatory humoral and innate immune pathways are insufficient to replace NLRC5's function in cancer immune surveillance.
- Loss of NLRC5 compromises the host's ability to control tumor development and progression.
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