Suppression of B cell responses by natural killer cells is mediated through direct effects on T cells

Paul Katz, S. Ray Mitchell, Thomas R. Cupps, Mishell Evans, Gail Whalen

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16 Scopus citations


We examined the ability of human natural killer (NK) cells to modulate T cell-dependent mitogen-induced B cell responses. Highly purified NK cells inhibited the polyclonal antibody responses of autologous pokeweed mitogen (PWM)-stimulated unfractionated mononuclear cells in a reverse hemolytic plaque-forming cell (PFC) assay. Investigation of the possible mechanism(s) of the suppressor activity of NK cells revealed that lysis of mitogen-stimulated cells was unlikely. Chromium-51 release cytotoxicity assays of PWM-stimulated mononuclear cells did not demonstrate lysis by NK cells. Additionally, the monoclonal antibody 13.3, which abrogates NK cell cytolysis, did not reverse NK cell-dependent suppression of PFC formation. The putative lytic molecule elaborated by NK cells, NK cytotoxic factor, did not suppress B cell responses, further supporting a nonlytic inhibitory mechanism. That NK cell-derived lymphokines such as IFN-α, IFN-γ, or IL-2 were uninvolved in the down-regulation of B cells was corroborated by the failure of antibodies to these mediators to reverse the suppression. NK cells did not suppress PFC formation when T cells were replaced by supernatants from PWM-stimulated T cells; additionally, NK cells had no effect on the generation of these necessary T cell factors. However, the coculture of T cells with NK cells resulted in the induction of suppressor activity within the T cell population suggesting that this was the mechanism of NK cellmediated Suppression of B cell responses.

Original languageEnglish (US)
Pages (from-to)130-142
Number of pages13
JournalCellular Immunology
Issue number1
StatePublished - Mar 1989

ASJC Scopus subject areas

  • Immunology


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