Cancer Immunology, Immunotherapy

, Volume 62, Issue 8, pp 1335–1345

Gamma delta T cells are activated by polysaccharide K (PSK) and contribute to the anti-tumor effect of PSK

  • Carol Inatsuka
  • Yi Yang
  • Ekram Gad
  • Lauren Rastetter
  • Mary L. Disis
  • Hailing Lu
Original Article


Polysaccharide K (PSK) is a widely used mushroom extract that has shown anti-tumor and immunomodulatory effects in both preclinical and clinical studies. Therefore, it is important to understand the mechanism of actions of PSK. We recently reported that PSK can activate toll-like receptor 2 and enhances the function of NK cells. The current study was undertaken to study the effect of PSK on gamma delta (γδ) T cells, another important arm of the innate immunity. In vitro experiments using mouse splenocytes showed that γδ T cells produce IFN-γ after treatment with PSK and have up-regulated expression of CD25, CD69, and CD107a. To investigate whether the effect of PSK on γδ T cells is direct or indirect, purified γδ T cells were cultured either alone or together with bone marrow-derived DC in a co-culture or trans-well system and then stimulated with PSK. Results showed that direct cell-to-cell contact between γδ T cells and DC is required for optimal activation of γδ T cells. There was also reciprocal activation of DC by PSK-activated γδ T cells, as demonstrated by higher expression of costimulatory molecules and enhanced production of IL-12 by DC in the presence of γδ T cells. PSK can also co-stimulate γδ T cells with anti-TCR and anti-CD3 stimulation, in the absence of DC. Finally, in vivo treatment with PSK activates γδ T cells among the tumor infiltrating lymphocytes, and depleting γδ T cells during PSK treatment attenuated the anti-tumor effect of PSK. All together, these results demonstrated that γδ T cells are activated by PSK and contribute to the anti-tumor effect of PSK.


PSK  Polysaccharide  γδ T cells  TLR  Breast cancer  Innate immunity 



Complementary and alternative medicine


Cytotoxic T lymphocyte


Dendritic cells


Enzyme-linked immunosorbent assay


Fetal bovine serum


Gamma delta


Interferon gamma




Monoclonal antibody


Natural killer


Pathogen-associated molecular patterns


Peripheral blood mononuclear cells


Phosphate-buffered saline


Polysaccharide K


Tumor infiltrating lymphocytes


Toll-like receptor


Tumor necrosis factor alpha

Supplementary material

262_2013_1436_MOESM1_ESM.pdf (101 kb)
Supplementary material 1 (PDF 101 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Carol Inatsuka
    • 1
  • Yi Yang
    • 1
  • Ekram Gad
    • 1
  • Lauren Rastetter
    • 1
  • Mary L. Disis
    • 1
  • Hailing Lu
    • 1
  1. 1.Tumor Vaccine Group, Center for Translational Medicine in Women’s HealthUniversity of WashingtonSeattleUSA

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