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Updated: Oct 5, 2026

Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
Published on: February 22, 2020
Protein-bound polysaccharide K and interleukin-2 regulate different nuclear transcription factors in the NKL human
A García-Lora1, S Pedrinaci, F Garrido
1Servicio de Análisis Clínicos e Inmunología, Hospital Universitario Virgen de las Nieves, Universidad de Granada, Spain.
Abstract:
The activation of natural killer cells and induction of cytotoxicity are complex processes whose molecular mechanisms have not been clearly elucidated. Stimulation of the NKL human NK cell line with interleukin-2 (IL-2) or protein-bound polysaccharide K (PSK) leads to sustained growth and cytolytic activity in comparison to unstimulated NKL cells. However, it is not known whether both agents give rise to the same or different intracellular signals. To determine the molecular basis for the action of IL-2 and PSK, the binding activity of AP-1, CRE, NF-kappaB, PU.1, SP-1, NFAT, STAT1, STAT5/6, GAS/ISRE and IRF-1 transcription factors was compared in IL-2- and PSK-stimulated NKL cells. Here we report that PSK enhanced AP-1 and CRE binding activities, whereas IL-2 increased AP-1 and SP-1 and modified GAS/ISRE, IRF-1 and STAT5. Our results indicate that IL-2 and PSK regulate different nuclear transcription factors in NKL cells, and that the signal transduction pathway used by these inducers is different.
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