Complex interactions occur among host defense cells during bacterial infection. Bacteria and bacterial products may enhance or inhibit the effector and regulatory activity of human lymphocytes. Accordingly, we tested the ability of human periodontal pathogens to activate peripheral blood lymphocytes using standard 51chromium-release assays to measure lymphocyte-mediated cytolysis. Human adherent-cell depleted peripheral blood lymphocytes (PBL) with the addition of glutaraldehyde-fixed bacteria at a 5:1 bacteria:lymphocyte ratio were incubated at 37°C for 24 hr in RPMI 1640 medium. Six of eight bacteria tested significantly augmented lymphocyte killing of the natural killer (NK) cell-sensitive human erythroleukemia cell line K562. E. corrodens, representing activating bacteria, was also able to induce the killing of NK-resistant targets (M14, Raji), comparable with induction by interleukin-2. Lipopolysaccharides extracted from A. actinomycetemcomitans strains, when incubated with PBL, were able to enhance cytotoxicity without the presence of whole bacteria. A majority of cytotoxicity was mediated by NK cells bearing Leu-11 and NKH-1 markers.
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