Abstract
The generation of cytotoxic T lymphocytes (CTL) towards allogeneic cells was investigated in 19 patients with monoclonal gammopathy of undetermined significance (MGUS) and 31 patients with multiple myeloma (MM). This function was significantly decreased in all patients. The cytotoxic deficiency was more pronounced in MM with poor prognosis than MM with good prognosis and MGUS patients. A phenotypic analysis of PBT lymphocytes showed that poor prognosis MM also had the highest proportions of activated cells (HLA-DR+) in CD8+ subpopulations. CTL were generated after depletion of CD11+ lymphocytes (including suppressor cells) or after inhibition of suppressor function with deoxyguanosine. No increase of cytotoxicity was detected under these conditions. Exogenous supplementation of recombinant interleukin 2 (rIL-2) was also ineffective. These data indicate that MG PBT lymphocytes are unable to fully differentiate into CTL following allogeneic stimulation. This deficiency is most evident in MM patients already showing the poorest prognosis and the most altered T cell phenotype.
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Selected References
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