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Identification of the protein components of protein-bound polysaccharide (PSK) that interact with NKL cells

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Abstract

We identified the protein components of a protein-bound polysaccharide (PSK) that are responsible for the biological function of this immunomodulator in its interaction with NKL cells, an NK-derived cell line previously known to be activated by this extract, obtained from the basidiomycete Coriolus versiocolor. In addition, we show that PSK protein interacts with NKL cells through a different receptor from that used by IL-2. This was deduced from the different molecular weights of the PSK/NKL and IL-2/NKL receptor complexes. We show that PSK is composed of a highly glycosylated 12-kDa protein. Protein-bound polysaccharide interacts in vitro with an NKL receptor of approximately 48 kDa, whereas IL-2 shows a similar interaction with NKL receptor proteins of approximately 64 and 75 kDa. Our results may explain why PSK and IL-2 use completely different intracellular routes for their biological activities in NKL cells—i.e., regulating different PKC isozymes, mitogen-activated protein kinases, and nuclear transcription factors.

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Acknowledgments

We thank K. Shashok for improving the English in the manuscript. This work was supported by Kureha Chemical Industry, Tokyo, Japan.

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Correspondence to Federico Garrido.

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Jiménez, E., Garcia-Lora, A., Martinez, M. et al. Identification of the protein components of protein-bound polysaccharide (PSK) that interact with NKL cells. Cancer Immunol Immunother 54, 395–399 (2005). https://doi.org/10.1007/s00262-004-0601-1

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  • DOI: https://doi.org/10.1007/s00262-004-0601-1

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