title: Activated gamma/delta T lymphocytes infiltrating renal cell carcinoma.
abstract: Gamma/delta (gamma delta) T lymphocytes have been postulated to play a role in a surveillance mechanism that eliminates transformed or otherwise damaged cells. In this study, we examined by flow cytometry the frequency and phenotype of gamma delta T cells in the tumour infiltrating lymphocytes (TIL) and peripheral blood (PBL) from renal cell carcinoma patients. The TCR gamma delta + cells comprised an average of 3.8% of the CD3+ TIL and 5.2% of circulating T cells. Analysis of surface immunophenotype revealed that activation markers of T lymphocytes: CD25 and HLA DR were highly expressed on the tumour infiltrating gamma delta + T lymphocytes (median 27.6% for CD25 and 52.0% for HLA DR). More importantly, percentage of activated gamma delta T cells was found to be much higher than compared to all activated CD3+ cells. Furthermore, an unusually high proportion of gamma delta positive TILs express CD4 or CD8 molecules (17.2 and 36.8%, respectively), indicating that they might recognise antigen presented within MHC II or I context. These results suggest that gamma delta T lymphocytes may play a certain role in immune response against tumour cells.
authors.affiliation: Institute of Human Genetics, Polish Academy of Sciences, Poznań, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Kowalczyk
authors.forename: W
authors.initials: W
authors.lastname: Skorupski
authors.forename: Z
authors.initials: Z
authors.lastname: Kwias
authors.forename: J
authors.initials: J
authors.lastname: Nowak
mesh_terms: D017252:CD3 Complex / Q000276:immunology; D015704:CD4 Antigens / Q000276:immunology; D016827:CD8 Antigens / Q000276:immunology; D002292:Carcinoma, Renal Cell / Q000276:immunology* / Q000473:pathology; D005434:Flow Cytometry / Q000379:methods; D006684:HLA-DR Antigens / Q000276:immunology; D006801:Humans; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000145:classification / Q000276:immunology*; D015375:Receptors, Interleukin-2 / Q000276:immunology
chemical_list: D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; D006684:HLA-DR Antigens; D016692:Receptors, Antigen, T-Cell, gamma-delta; D015375:Receptors, Interleukin-2