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. 1992 Jun;76(2):299–304.

Modulation of in vitro porcine natural killer cell activity by recombinant interleukin-1 alpha, interleukin-2 and interleukin-4.

K F Knoblock 1, P C Canning 1
PMCID: PMC1421538  PMID: 1634252

Abstract

In order to understand better how cytokines modulate porcine lymphocyte-mediated natural cytotoxicity and to develop a rapid and reliable colorimetric assay to study that activity in young pigs, we studied inherent and cytokine induced in vitro natural killer (NK) activity. The cytokines we studied were human recombinant interleukin-1 alpha (IL-1 alpha), IL-2, IL-4 and interferon-gamma (IFN-gamma). Natural killer activity by peripheral blood mononuclear cells (PBMC), reported as per cent specific lysis (%SL), was determined by the colorimetric measurement of lactate dehydrogenase released from tumour cell targets, YAC-1 and K562. Inherent NK activity was low and remained relatively unchanged by alterations of assay length or effector cell concentration. Low NK activity was also observed in response to IL-4 and IFN-gamma. IL-2 and, to a lesser extent, IL-1 alpha induced significant NK activity with trends towards increasing %SL with increasing cytokine dose. Optimal IL-1 alpha- and IL-2-induced NK activity could be observed at 18 hr, with significant activity stimulated by IL-2 as early as 4 hr. IL-2-induced NK activity was sensitive to effector cell concentration; %SL decreased as the effector to target ratio decreased. IL-1 alpha- and IL-2-induced NK activities were decreased in the presence of IL-4. These results indicate porcine PBMC are sensitive to in vitro modulation by human recombinant IL-1 alpha, IL-2 and IL-4. The ability of IL-1 alpha and IL-2 to induce swine NK activity and the ability of IL-4 to inhibit that activity are similar to the actions of those cytokines in human NK systems.

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Selected References

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