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Flow Cytometry-Based Isolation and Therapeutic Evaluation of Tumor-Infiltrating Lymphocytes in a Mouse Model of Pancreatic Cancer
Published on: January 17, 2025
726
IL-2 promotes expansion and intratumoral accumulation of tumor infiltrating dendritic cells in pancreatic cancer
Tingting Gong1, Xinyang Huang1, Zhuoxin Wang1
1Department of Gastroenterology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin Er Road, Shanghai, 200025, China.
Cancer Immunology, Immunotherapy : CII
|March 30, 2024
Summary
Higher interleukin-2 (IL-2) levels correlate with better pancreatic ductal adenocarcinoma (PDAC) survival. Co-culturing dendritic cells (DCs) with peripheral blood mononuclear cells (PBMCs) and IL-2 enhances anti-PDAC vaccine efficacy.
Area of Science:
- Immunology
- Oncology
- Biotechnology
Background:
- Pancreatic ductal adenocarcinoma (PDAC) remains a challenging malignancy with limited treatment options.
- Interleukin-2 (IL-2) is a cytokine with known roles in immune regulation.
- Dendritic cell (DC) based vaccines are a promising strategy for cancer immunotherapy.
Purpose of the Study:
- To investigate the diagnostic and prognostic value of IL-2 in PDAC.
- To develop an improved DC-based vaccine strategy for PDAC by exploring novel culture conditions.
Main Methods:
- Analysis of gene expression and clinical data from 178 PDAC patients (TCGA).
- Isolation and culture of human peripheral blood mononuclear cells (PBMCs) and dendritic cells (DCs) under various conditions, including co-culture with PBMCs and IL-2.
- Pulsing DCs with tumor lysates or KRAS G12D peptide and evaluating their ability to activate T cells.
- Assessment of DC and T cell infiltration in a xenograft mouse model via immunohistochemistry.
- In vitro killing assays to determine the generation of KRAS G12D mutation-specific cytotoxic T cells.
Main Results:
- Elevated IL-2 mRNA levels in PDAC patients were associated with improved overall survival and increased infiltration of CD8+ T cells, NK cells, B cells, and myeloid DCs.
- IL-2 alone did not significantly improve DC function without co-culture with PBMCs.
- DCs co-cultured with PBMCs and IL-2 demonstrated potent in vitro and in vivo anti-tumor effects.
- This novel PBMC-IL-2 co-culture method enhanced DC tumor infiltration capacity compared to traditional methods (GM-CSF/IL-4).
- DCs cultured with PBMCs and IL-2 effectively promoted the generation of cytotoxic T cells targeting KRAS G12D-mutated tumor cells.
Conclusions:
- IL-2 shows potential as a prognostic biomarker for PDAC.
- Co-culturing dendritic cells with PBMCs and IL-2 represents a promising strategy to enhance DC-based vaccine efficacy against PDAC by improving T cell immunity and tumor infiltration.
