PMID: 25750309Mar 10, 2015Paper

In vitro exposure of NK-92 cells to serum from patients with non-small cell lung cancer impairs their cytotoxicity

Anticancer Research
Dimitris TsartsalisKonstantinos Syrigos

Abstract

To investigate the effect of serum from patients with non-small cell lung cancer (NSCLC) on in vitro cytotoxicity of the clonal cell line NK-92. Twenty-six patients with NSCLC were included in this study. NK-92 cells were incubated in medium supplemented with 25% of each patient's serum (before and after chemotherapy) for 24 h, then washed and tested for cytotoxicity against NK-sensitive K562 targets. The cytotoxicity of NK-92 cells exposed to serum from patients with NSCLC before chemotherapy initiation was significantly reduced compared to that upon incubated with serum from healthy individuals (p<0.001). NK-92 cytotoxicity was further reduced upon exposure to patient's serum after the first and third chemo therapy cycles (p<0.001). The results of our in vitro study suggest that serum of patients with NSCLC may exert per se an inhibitory effect on the cytotoxicity of NK-92 cells and this negative regulation may be enhanced with chemotherapy.

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