Related Experiment Video
Updated: Jun 21, 2025
Flow Cytometry-Based Isolation and Therapeutic Evaluation of Tumor-Infiltrating Lymphocytes in a Mouse Model of Pancreatic Cancer
Published on: January 17, 2025
Intratumoral NKT cell accumulation promotes antitumor immunity in pancreatic cancer
Jiayun Li1, Philip Moresco1,2,3, Douglas T Fearon1,4
1Cancer Center, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724.
Abstract:
Pancreatic ductal adenocarcinoma (PDA) is a potentially lethal disease lacking effective treatments. Its immunosuppressive tumor microenvironment (TME) allows it to evade host immunosurveillance and limits response to immunotherapy. Here, using the mouse KRT19-deficient (sgKRT19-edited) PDA model, we find that intratumoral accumulation of natural killer T (NKT) cells is required to establish an immunologically active TME. Mechanistically, intratumoral NKT cells facilitate type I interferon (IFN) production to initiate an antitumor adaptive immune response, and orchestrate the intratumoral infiltration of T cells, dendritic cells, natural killer cells, and myeloid-derived suppressor cells. At the molecular level, NKT cells promote the production of type I IFN through the interaction of their CD40L with CD40 on myeloid cells. To evaluate the therapeutic potential of these observations, we find that administration of folinic acid to mice bearing PDA increases NKT cells in the TME and improves their response to anti-PD-1 antibody treatment. In conclusion, NKT cells have an essential role in the immune response to mouse PDA and are potential targets for immunotherapy.
Insights
Natural killer T (NKT) cells are crucial for an active anti-tumor immune response in pancreatic ductal adenocarcinoma (PDA). Boosting NKT cells enhances immunotherapy effectiveness against this lethal cancer.
Area of Science:
- Immunology
- Oncology
Background:
- Pancreatic ductal adenocarcinoma (PDA) is a lethal cancer with limited treatment options.
- The immunosuppressive tumor microenvironment (TME) hinders effective anti-cancer immunity and immunotherapy response.
- Understanding the immune dynamics within the PDA TME is critical for developing novel therapeutic strategies.
Purpose of the Study:
- To investigate the role of natural killer T (NKT) cells in shaping the immune landscape of the PDA TME.
- To elucidate the mechanisms by which NKT cells influence anti-tumor immunity in PDA.
- To explore the therapeutic potential of targeting NKT cells for PDA treatment.
Main Methods:
- Utilized a mouse model of pancreatic ductal adenocarcinoma (sgKRT19-edited).
- Analyzed the composition and function of immune cells within the tumor microenvironment.
- Investigated molecular interactions between NKT cells and myeloid cells (CD40L-CD40).
- Assessed the therapeutic efficacy of folinic acid combined with anti-PD-1 antibody treatment.
Main Results:
- Intratumoral accumulation of NKT cells was essential for an immunologically active PDA TME.
- NKT cells promoted type I interferon (IFN) production, initiating adaptive anti-tumor immunity.
- NKT cells orchestrated the infiltration of various immune cells, including T cells, dendritic cells, and NK cells.
- NKT cell-mediated type I IFN production involved CD40L-CD40 interactions with myeloid cells.
- Folinic acid administration increased intratumoral NKT cells and enhanced anti-PD-1 therapy response in mice.
Conclusions:
- NKT cells play a pivotal role in mediating immune responses against mouse PDA.
- NKT cells are a promising therapeutic target for enhancing immunotherapy in pancreatic cancer.
- Modulating NKT cell activity represents a potential strategy to overcome immune evasion in PDA.
Related Concept Videos
01:27Tumor Immunotherapy
01:27Cytotoxic T Cells-mediated Immune Response
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
02:30Metastasis
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...