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Activated gamma/delta T lymphocytes infiltrating renal cell carcinoma
D Kowalczyk1, W Skorupski, Z Kwias
1Institute of Human Genetics, Polish Academy of Sciences, Poznań, Poland.
Immunology Letters
|October 1, 1996
Summary
Gamma/delta T lymphocytes, crucial for immune surveillance, are activated within tumors of renal cell carcinoma patients. These cells show higher activation and express CD4/CD8, suggesting a role in anti-tumor immunity.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Gamma/delta (gamma delta) T lymphocytes are implicated in eliminating damaged or transformed cells.
- Their specific role in renal cell carcinoma (RCC) immune surveillance requires further investigation.
Purpose of the Study:
- To determine the frequency and phenotype of gamma delta T cells in tumor-infiltrating lymphocytes (TIL) and peripheral blood lymphocytes (PBL) of RCC patients.
- To assess the activation status and co-receptor expression of tumor-infiltrating gamma delta T cells.
Main Methods:
- Flow cytometry was used to analyze TIL and PBL from RCC patients.
- Immunophenotyping identified gamma delta T cells and assessed expression of activation markers (CD25, HLA-DR) and co-receptors (CD4, CD8).
Main Results:
- Gamma delta T cells constituted 3.8% of CD3+ TIL and 5.2% of PBL.
- Tumor-infiltrating gamma delta T cells exhibited significantly higher expression of CD25 (median 27.6%) and HLA-DR (median 52.0%) compared to other CD3+ cells.
- A notable proportion of gamma delta TILs expressed CD4 (17.2%) or CD8 (36.8%).
Conclusions:
- Gamma delta T lymphocytes are activated within the tumor microenvironment of RCC patients.
- Their co-expression of CD4/CD8 suggests antigen recognition in the context of MHC class I or II.
- These findings support a potential role for gamma delta T cells in anti-tumor immune responses against renal cell carcinoma.