Abstract
BACKGROUND AND AIM: Head and neck cancers (HNC) are aggressive tumours. Tumour-specific T cells are frequently identified in patients with cancer, although they fail to control tumour progression. A family of proteins called co-stimulatory receptors regulate the function of T cells and may account for T cell dysfunction in cancer. Our aim was to characterise co-stimulatory receptors on T cells in HNC patients to identify novel targets for immunotherapy.
METHODS: Peripheral blood mononuclear cells were isolated from HNC patients and healthy controls and the expression of co-stimulatory (OX40, 4-1BB, ICOS) and co-inhibitory (CTLA-4, PD1) receptors was analysed on CD4(+) and CD8(+) T cells using flow cytometry.
RESULTS: We found that the levels of co-stimulatory receptors OX40 and 4-1BB were significantly lower on CD4(+) T cells from HNC patients. This was more pronounced in locally advanced tumours (T3/T4) compared to early carcinomas (T1/T2). PD-1 levels were higher on CD8(+) T cells in HNC patients compared to controls. Human papilloma virus (HPV)-specific CD8(+) T cells appeared to be more affected than Influenza-specific T cells.
CONCLUSIONS: Our results indicate that expression of co-stimulatory receptors on T cells from HNC patients is imbalanced with a preponderance of inhibitory signals, and reduction of stimulatory signals, especially in advanced disease. Restoring this balance could improve T cell therapy outcomes in HNC.
Original language | English |
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Pages (from-to) | 669-75 |
Number of pages | 7 |
Journal | Immunobiology |
Volume | 217 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2012 |
Keywords
- CD4-Positive T-Lymphocytes/metabolism
- CD8-Positive T-Lymphocytes/metabolism
- CTLA-4 Antigen/genetics
- Carcinoma/genetics
- Case-Control Studies
- Flow Cytometry
- Gene Expression Regulation, Neoplastic
- Head and Neck Neoplasms/genetics
- Humans
- Inducible T-Cell Co-Stimulator Protein/genetics
- Influenza, Human/genetics
- Neoplasm Staging
- Orthomyxoviridae/immunology
- Papillomaviridae/immunology
- Programmed Cell Death 1 Receptor/genetics
- Receptors, Antigen, T-Cell/genetics
- Receptors, OX40/genetics
- Tumor Necrosis Factor Receptor Superfamily, Member 9/genetics