Phenotype, activation and lymphokine secretion by γ/δ T lymphocytes from schistosomiasis and carcinoma of the urinary bladder

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Abstract
In humans the majority of the CD3+ T cells usually express an α/ß T cell receptor (TcR) and a minority express a γ/δ TcR. The CD3+ TcR α/ß and CD3+ TcR γ/δ cells from blood of the patients with schistosomiasis with carcinoma of the urinary bladder (SCB) were analyzed for phenotype, activation, secretion of interleukin 2 (IL2), B cell growth factor (BCGF) and B cell differentiation factor (BCGF), as well as for autologous (AMLR) and allogeneic (MLR) mixed lymphocyte reaction. Patients with SCB had a highly increased percentage of CD3+ TcRγ/δ and a decreased percentage of CD3+ TcR γ/ß T cells in their circulation. These CD3+ TcR γ/δ T cells expressed the CD25 (IL 2 receptor), CD38, CD71 (transferrin receptor) and HLA‐DR activation antigens at a higher intensity after in vitro stimulation with recombinant IL 2, phytohemagglutinin and soluble egg antigen (from Schistosoma haematobium). The SCB patients' CD3+ TcR γ/δ T cells were highly deficient in secretion of IL 2 but produced highly elevated levels of BCGF and BCDF. On the contrary, both BCGF and BCDF activities of the CD3+ TcR α/β T cells were decreased. Moreover, CD3+ TcR γ/δ T cells demonstrated highly deficient AMLR and MLR activity. These observations suggest a possible role of CD3+ TcR γ/δ T cells in the immune response and the disease pathogenesis in human schistosomiasis infections.

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