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Bacterial induction of human activated lymphocyte killing and its inhibition by lipopolysaccharide (LPS).

J Tarkkanen, H Saxén, M Nurminen, P H Mäkelä and E Saksela
J Immunol April 1, 1986, 136 (7) 2662-2669;
J Tarkkanen
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H Saxén
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M Nurminen
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P H Mäkelä
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E Saksela
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Abstract

Peripheral blood lymphocytes were incubated with glutaraldehyde-fixed Salmonella bacteria. This resulted in rapid activation of nonspecific cytotoxic potential of the lymphocytes. Both originally noncytotoxic, high-density Percoll-fractionated cells, and cytotoxic natural killer (NK) cell-enriched low-density cells were activated. The induction of originally noncytotoxic cells into activated killer (AK) cells was apparently independent of interferon (IFN), whereas the activation of the NK cell-enriched fractions also involved IFN production. Neither the AK nor NK activity were associated with significant bactericidal activity. The IFN-independent induction of AK activity was not dependent on the O-antigenic polysaccharide part of the lipopolysaccharide (LPS) on the bacterial cell surface, because both smooth (S) strains with differing O-antigenic structures (S-4,12 and S-6,7) and a rough (Re) strain without O-antigen were effective inducers. Isolated LPS, and especially alkali-hydrolyzed (O-deacylated, detoxified) LPS (ALPS) interfered with the induction of cytotoxicity. At concentrations of 10 to 30 micrograms/ml, ALPS totally inhibited the induction of AK activity without affecting the endogenous NK activity. Thus contact with bacteria can lead to the emergence of AK cells, and a bacterial product can effectively block this activation. These phenomena stress the complexity of interactions with host defenses that can take place during bacterial infection.

  • Copyright © 1986 by American Association of Immunologists

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The Journal of Immunology
Vol. 136, Issue 7
1 Apr 1986
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Bacterial induction of human activated lymphocyte killing and its inhibition by lipopolysaccharide (LPS).
J Tarkkanen, H Saxén, M Nurminen, P H Mäkelä, E Saksela
The Journal of Immunology April 1, 1986, 136 (7) 2662-2669;

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Bacterial induction of human activated lymphocyte killing and its inhibition by lipopolysaccharide (LPS).
J Tarkkanen, H Saxén, M Nurminen, P H Mäkelä, E Saksela
The Journal of Immunology April 1, 1986, 136 (7) 2662-2669;
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Print ISSN 0022-1767        Online ISSN 1550-6606