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Updated: Jul 4, 2026
A Preclinical Mouse Model of Osteosarcoma to Define the Extracellular Vesicle-mediated Communication Between Tumor and Mesenchymal Stem Cells
Published on: May 6, 2018
Interactions between osteosarcoma cell lines and dendritic cells immune function: An in vitro study
Michela Muraro1, Oana M Mereuta, Francesco Saglio
1Stem Cell Transplantation and Cellular Therapy Unit, Pediatric Onco-Hematology Department, Regina Margherita Children's Hospital, Piazza Polonia 94, 10126 Turin, Italy.
Abstract:
Dendritic cells (DCs) might be partly responsible for the defective immune response in tumor bearing hosts, but no study in osteosarcoma patients is still available. Therefore, we investigated in vitro whether human osteosarcoma cell lines have an inhibitor effect on different types of DCs: CD14+DCs, DC1 and DC2. DCs derived from healthy donors were cultured with osteosarcoma cell lines and appropriate cytokine cocktails and analysed for the expression of co-stimulatory molecules (CD40, CD80, CD83, CD86, HLA-DR). Each interaction resulted in a lower phenotypic expression of the DCs maturation markers, especially on DC2. Moreover, the addition of various cytokines and compounds (rhIL-12, CD40L, Indometacin) induced the DC1 and DC2 subsets towards the Th1 pattern as shown by ELISA. Osteosarcoma highly interferes with an in vitro DCs immune function as antigen presenting cells. The understanding of tumor biology underlines the need for a specific osteosarcoma immunotherapy able to reverse this immune-surveillance inhibition.
Insights
Osteosarcoma cell lines inhibit dendritic cell (DC) maturation and immune function in vitro. This study highlights the need for osteosarcoma immunotherapies to overcome tumor-induced immune suppression.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial for initiating immune responses.
- Tumor-bearing hosts often exhibit impaired immune function.
- The role of DCs in osteosarcoma immune response is not well understood.
Purpose of the Study:
- To investigate the in vitro inhibitory effect of human osteosarcoma cell lines on different DC subsets.
- To analyze the impact of osteosarcoma cells on DC maturation and immune function.
- To explore potential strategies for reversing tumor-induced immune suppression in osteosarcoma.
Main Methods:
- Human osteosarcoma cell lines were co-cultured with dendritic cells (CD14+DCs, DC1, DC2) derived from healthy donors.
- DC maturation markers (CD40, CD80, CD83, CD86, HLA-DR) were analyzed using flow cytometry.
- The effect of cytokines (rhIL-12, CD40L) and indomethacin on DC differentiation towards a Th1 pattern was assessed by ELISA.
Main Results:
- Osteosarcoma cell lines significantly reduced the phenotypic expression of DC maturation markers, particularly in DC2 subset.
- Co-culture with osteosarcoma cells impaired the antigen-presenting capacity of DCs.
- Treatment with specific cytokines and compounds promoted a Th1 immune response pattern in DC1 and DC2 subsets.
Conclusions:
- Human osteosarcoma cell lines exert a potent inhibitory effect on dendritic cell immune function in vitro.
- Osteosarcoma interferes with DC maturation and antigen presentation, contributing to immune evasion.
- Targeted immunotherapies are needed to reverse osteosarcoma-induced immune suppression and enhance anti-tumor immunity.
