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- W2412527442 abstract "Natural killer (NK) cells probably have immunoregulatory effects. However, the evidence to date is mainly based on the suppressive effect of enrichment with relatively impure NK populations (large granular lymphocytes, LGL, Leu 7a+ cells). Here we report on the effect of enrichment and depletion of Leu 7a+ and Leu 11b+ cells (the latter containing virtually all NK activity in freshly prepared lymphocytes) on pokeweed mitogen (PWM)-induced immunoglobulin (Ig) synthesis. Enrichment suppressed Ig synthesis to a degree dependent on the number of cells added, and was not enhanced further by their pretreatment with interferon. Furthermore, depletion of Leu 11b+ cells from peripheral blood lymphocytes (PBL) led to marked enhancement (2-25-fold increase) of Ig synthesis, suggesting these cells may normally exert a suppressive effect. The possible underlying mechanisms were investigated further. Enhanced Ig synthesis by Leu 11b-depleted cultures was associated with an increased number of Ig-secreting cells by plaque assay, but with no change in numbers of CD4+ or CD8+ cells. Treatment of PBL with monoclonal antibodies (anti-Leu 7a/Leu 11b) alone suppressed PWM-induced immunoglobulin synthesis. We conclude that NK cells play a role in the regulation of Ig production, at least in part by an effect on activation/differentiation of B cells, but independent of altered T-cell subpopulations. The effect may be unrelated to their cytotoxic function (being unaffected by interferon, IFN), although the direct effects of anti-Leu 11b and Leu 7a in enhancing the suppressive effect suggest an alternative activation pathway." @default.
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- W2412527442 date "1988-09-01" @default.
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- W2412527442 title "Suppressive role of NK cells in pokeweed mitogen-induced immunoglobulin synthesis: effect of depletion/enrichment of Leu 11b+ cells." @default.
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