Abstract
Nickel sulphate antigen-induced peripheral blood lymphocyte activation in vitro was characterized by lymphokine measurement (IL-2, IFN-gamma) and phenotyping of the IL-2 responsive cells. Mononuclear cells from nickel-sensitive patients synthesized more DNA, produced more IL-2 and had more IL-2 receptor positive cells in response to nickel than did those of the control subjects. On the other hand no IFN-gamma was detectable in the nickel supernatants, while PPD, used as the control antigen, induced pronounced quantities of IFN-gamma with an equal amount of DNA synthesis. The increase in IL-2 receptor positive cells was due to activation of CD4+ (helper/inducer) T cells. T cells with HLA-DR antigen surface markers were more numerous on each day of culture than cells with IL-2 receptors. These two activation markers were co-expressed on the same cells only to a certain extent, thus perhaps reflecting different types or phases of activation. In conclusion, nickel-induced peripheral blood mononuclear cell activation in vitro differs from microbial antigen-induced activation with respect to its modest or non-existent IFN-gamma response.
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Selected References
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