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- W2022255346 abstract "The cultivation of peripheral blood lymphocytes (PBL) obtained from patients with colorectal or bladder carcinoma and melanoma and from healthy donors in the presence of interleukin-2 (IL-2) and PHA resulted in the induction of cytotoxic activity against autologous and/or allogeneic tumour cells in 12 out of 13 patients and in 10 out of 10 donors. A higher level of cytolytic activity was achieved when PBL were separated by means of Percoll density gradient (1.077; 1.067 and 1.056 g/ml) centrifugation and the cells of fraction II (1.077-1.067 g/ml) were employed in the experiment, the level of cytotoxicity being elevated in all cases (1.7-fold elevation in donors and 2-fold elevation in patients on the average). The addition of fraction I (1.067-1.056 g/ml) to fraction II prevented (PHA + IL-2)-mediated induction of cytotoxic activity in all the patients, but in 4 out of 10 donors, i.e. cells of fraction I expressed a suppressor activity. The immunofluorescent analysis has shown that fraction II was enriched by T cells (92%) and depleted of monocytes (7%), as compared to unseparated PBL (66% and 27%, respectively). On the contrary, fraction I was characterized by a decreased T cell ratio (36%) and an increased monocyte level (up to 69%)." @default.
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- W2022255346 title "Cytotoxic and suppressor activity of human peripheral blood lymphocytes, stimulated by interleukin-2 and phytohemagglutinin, before and after separation in a percoll gradient" @default.
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