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.
Similar content being viewed by others
References
Algarra I, Collado A, Garrido F (1997) Protein-bound polysaccharide PSK abrogates more efficiently experimental metastases derived from H-2 negative than from H-2 positive fibrosarcoma tumor clones. J Exp Clin Cancer Res 16:373
Algarra I, Garcia-Lora A, Collado A, Garrido F (1999) Differential effect of protein-bound polysaccharide (PSK) on survival of experimental murine tumors. J Exp Clin Cancer Res 18:39
Asai K, Kato H, Hirose K, Akaogi K, Kimura S, Mukai S, Inoue M, Yamamura Y, Sano H, Sugino S, Yoshikawa T, Kondo M (2000) PSK and OK-432-induced immunomodulation of inducible nitric oxide (NO) synthase gene expression in mouse peritoneal polymorphonuclear leukocytes and NO-mediated cytotoxicity. Immunopharmacol Immunotoxicol 22:221
Browder LW, Wilkes J, Rodenhiser DI (1992) Preparative labeling of proteins with [35S]methionine. Anal Biochem 204:85
Fisher M, Yang LX (2002) Anticancer effects and mechanisms of polysaccharide-K (PSK): implications of cancer immunotherapy. Anticancer Res 22:1737
Fujii T, Hisanaka T, Ogoma Y, Kondo Y (1993) Interaction of a protein-bound polysaccharide (PSK) with chicken gizzard caldesmon. Biol Pharm Bull 16:544
Garcia-Lora A, Pedrinaci S, Garrido F (2001) Protein-bound polysaccharide K and interleukin-2 regulate different nuclear transcription factors in the NKL human natural killer cell line. Cancer Immunol Immunother 50:191
Garcia-Lora A, Martinez M, Pedrinaci S, Garrido F (2003) Different regulation of PKC isoenzymes and MAPK by PSK and IL-2 in the proliferative and cytotoxic activities of the NKL human natural killer cell line. Cancer Immunol Immunother 52:59
Kanazawa M, Mori Y, Yoshihara K, Iwadate M, Suzuki S, Endoh Y, Ohki S, Takita K, Sekikawa K, Takenoshita S (2004) Effect of PSK on the maturation of dendritic cells derived from human peripheral blood monocytes. Immunol Lett 15(91):229
Kariya Y, Inoue N, Kihara T, Fujii M (1992) Activation of human natural killer cells by the protein bound polysaccharide PSK independently of interferon and interleukin 2. Immunol Lett 31:241
Kobayashi H, Matsunaga K, Oguchi Y (1995) Antimetastatic effects of PSK (Krestin), a protein-bound polysaccharide obtained from basidiomycetes: an overview. Cancer Epidemiol Biomarkers Prev 4:275
Kudo S, Tanaka J, Kashida H, Tamegai Y, Endo S, Yamano HO (2002) Effectiveness of immunochemotherapy with PSK, a protein-bound polysaccharide, in colorectal cancer and changes of tumor marker. Oncol Rep 9:635
Laemmli UK (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 15(227):680
Liu F, Ooi VE, Chang ST (1997) Free radical scavenging activities of mushroom polysaccharide extracts. Life Sci 60:763
Munemoto Y, Lida Y, Abe J, Saito H, Fujisawa K, Kasahara I, Mitsui T, Asada Y, Miura S (2002) Significance of postoperative adjuvant immunochemotherapy after curative resection of colorectal cancers: association between host or tumor factors and survival. Int J Oncol 20:403
Munemoto Y, Iida Y, Ohata K, Saito H, Fujisawa K, Kasahara Y, Mitsui T, Asada Y, Miura S (2004) Significance of postoperative adjuvant immunochemotherapy after curative resection of colorectal cancers: identification of responders incorporating the age factor. Oncol Rep 11:623
Nakazato H, Koike A, Saji S, Ogawa N, Sakamoto J (1994) Efficacy of immunochemotherapy as adjuvant treatment after curative resection of gastric cancer. Lancet 343:1122
Nio Y, Shiraishi T, Tsubono M, Morimoto H, Tseng C, Imai S, Tobe T (1991) In vitro immunomodulating effect of protein-bound polysaccharide PSK on peripheral blood, regional nodes, and spleen lymphocytes in patients with gastric cancer. Cancer Immunol Immunother 32:335
Ohwada S, Ikeya T, Yokomori T, Kusaba T, Roppongi T, Takahashi T, Nakamura S, Kakinuma S, Iwazaki S, Ishikawa H, Kawate S, Nakajima T, Morishita Y (2004) Adjuvant immunochemotherapy with oral Tegafur/Uracil plus PSK in patients with stage II or III colorectal cancer: a randomised controlled study. Br J Cancer 90:1003
Okuzawa M, Shinohara H, Kobayashi T, Iwamoto M, Toyoda M, Tanigawa N (2002) PSK, a protein-bound polysaccharide, overcomes defective maturation of dendritic cells exposed to tumor-derived factors in vitro. Int J Oncol 20:1189
Ooi VE, Liu F (2000) Immunomodulation and anti-cancer activity of polysaccharide-protein complexes. Curr Med Chem 7:715
Pang ZJ, Chen Y, Zhou M, Wan J (2000) Effect of polysaccharide krestin on glutathione peroxidase gene expression in mouse peritoneal macrophages. Br J Biomed Sci 57:130
Pedrinaci S, Algarra I, Garrido F (1999) Protein-bound polysaccharide (PSK) induces cytotoxic activity in the NKL human natural killer cell line. Int J Clin Lab Res 29(4):135
Robertson MJ, Cochran KJ, Cameron C, Le JM, Tantravahi R, Ritz J (1996) Characterization of a cell line, NKL, derived from an aggressive human natural killer cell leukemia. Exp Hematol 24:406
Tsukagoshi S, Hashimoto Y, Fujii G, Kobayashi H, Nomoto K, Orita K (1984) PSK. Cancer Treat Rev 11:131
Voss S, Sondel P, Robb R (1992) Characterization of the interleukin 2 receptors (IL-2R) expressed on human natural killer cells activated in vivo by IL-2; association of the p64 IL-2R gamma chain with the IL-2R beta chain in functional intermediate-affinity IL-2R. J Exp Med 176:531
Zhang H, Morisaki T, Nakahara C, Matsunaga H, Sato N, Nagumo F, Tadano J, Katano M (2003) PSK-mediated NF-kappaB inhibition augments docetaxel-induced apoptosis in human pancreatic cancer cells NOR-P1. Oncogene 10;22:2088
Acknowledgments
We thank K. Shashok for improving the English in the manuscript. This work was supported by Kureha Chemical Industry, Tokyo, Japan.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00262-004-0601-1