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. 1986 Jun;58(2):291–296.

Cytotoxicity by human adherent cells: oxygen-dependent and -independent cytotoxic reactions by different cell populations.

K P van Kessel, M R Visser, J A van Strijp, J H van Kats-Renaud, J Verhoef
PMCID: PMC1452664  PMID: 3710525

Abstract

Human adherent cells, obtained by EDTA reversible adherence to plastic, are potent effectors in cell-mediated cytotoxicity. Spontaneous cytotoxicity in a 2-hr assay against K562 target cells was shown to be largely mediated by contaminating natural killer (NK) cells. Treatment of adherent cells with NK-specific monoclonal antibody anti-Leu-11 plus complement abolished almost completely the spontaneous cytotoxicity. Spontaneous cytotoxicity by adherent cells was also reduced when the phorbol ester PMA was present in the assay. On the other hand, PMA induced a cytotoxic response in NK-cell depleted adherent cells after prolonged 18 hr incubation. The cell population responsible for this dichotomous effect of PMA on adherent cell-mediated cytotoxicity was shown to be monocytes, as revealed by monoclonal antibody treatment. Pure NK cell preparations were not affected by PMA in their cytolytic capacities. Reactive oxygen species are not involved in NK-cell mediated cytotoxicity, while PMA stimulated the monocytes to exert cytolysis and suppressed NK cells by the generation of these highly toxic oxygen products. Hydrogen peroxide especially seemed to be the mediator in this oxygen-dependent monocyte-mediated cytotoxicity and NK-cell suppression.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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