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To date over 400 HUCB transplants have been reported from different centers. It has been suggested that there is a reduced graft-versus-host-disease (GVHD) with HUCB compared to bone marrow transplantation. Since cytokine production by a cell is an indication of the cells function it is important to determinate the differences between APB and HUCB with respect to production of these soluble factors. Our aim was to analyse the intracellular cytokine production by HUCB and APB T lymphocytes with and emphasize on their possible role in GVHD. Heparinized HUCB samples from 8 normal full-term deliveries and 10 normal blood donors were stimulated 4 hours at 37 degrees C and 5% CO2 with phorbol 12-myristate 13-acetate (PMA) and lonomycin in the presence of brefeldine. Afterwards cells were stained with CD3, CD4 or CD8 in different combinations. Finally, after cell permeabilization, cells were stained with Il-2, Il-4 or IFN-gamma. Data acquisition was performed on a FACScan flow cytometer. Compared to APB, HUCB T lymphocytes produced less Il-2, Il-4 and IFN-gamma. In HUCB, Il-2, Il-4 and IFN-gamma were produced predominantly by CD4+ T cells. In APB, Il-2 and Il-4 were also produced predominantly by CD4+ cells compared with CD8+ T lymphocytes, however, IFN-gamma was produced by both CD4+ and CD8+ T cells. These results indicate that there are clear differences in the cytokine profile between T cells in APB and HUCB.

analytical cellular pathology

Comparative Intracellular Cytokine Production by<i>In Vitro</i>Stimulated T Lymphocytes from Human Umbilical Cord Blood (HUCB) and Adult Peripheral Blood (APB)

Comparative Intracellular Cytokine Production byIn VitroStimulated T Lymphocytes from Human Umbilical Cord Blood (HUCB) and Adult Peripheral Blood (APB)