Abstract
A soluble homogeneous β-glucan, GFPBW1, with a molecular mass of 300 kDa was purified from the fraction of the fruit bodies of Grifola frondosa extracted with 5 % NaOH. Using various methods, such as infrared spectroscopy, NMR, methylation and monosaccharide composition analysis, its structure was determined to be a β-D-(1-3)-linked glucan backbone with a single β-D-(1-6)-linked glucopyranosyl residue branched at C-6 on every third residue. It induced TNF-α and IL-6 production and the activation of Syk and NF-κB signaling in resident peritoneal macrophages from ICR mice, which could be significantly inhibited by the blocking reagent laminarin. A competitive phagocytosis assay with FITC-zymosan indicated that GFPBW1 could bind to DC-associated C-type lectin 1 (Dectin-1). The TNF-α secretion and activation of Syk/NF-κB signaling triggered by GFPBW1 were enhanced in RAW264.7 cells overexpressing wild but not mutant (Δ38 and Y15S) Dectin-1. Furthermore, GFPBW1 potentiated the Concanavalin A-induced proliferative response of splenocytes and inhibited Sarcoma-180 growth allografted in ICR mice but not in immunodeficient BALB/c nu/nu mice. These results suggested that the antitumor activity of GFPBW1 was partially associated with the activation of macrophages via the Dectin-1/Syk/NF-κB signaling pathway. This molecule could be a promising biological response modifier with clear application for antitumor therapies.
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Abbreviations
- BRMs:
-
Biological response modifiers
- CARD9:
-
Caspase recruitment domain 9
- ConA:
-
Concanavalin A
- CR3:
-
Complement receptor 3
- CTX:
-
Cyclophosphamide
- DCs:
-
Dendritic cells
- Dectin-1:
-
DC-associated C-type lectin 1
- DMSO:
-
Dimethyl sulfoxide
- FACS:
-
Fluorescence-activated cell sorting
- GC:
-
Gas chromatography
- G. frondosa :
-
Grifola frondosa (Fr.) S. F. Gray
- GRN:
-
Grifolan
- HPGPC:
-
High performance gel permeation chromatography
- HRP:
-
Horseradish peroxidase
- HSQC:
-
Heteronuclear single quantum coherence
- IR:
-
Infrared
- ITAM:
-
Immunoreceptor tyrosine-based activation motif
- LPS:
-
Lipopolysaccharide
- MS:
-
Mass spectrometry
- NF-κB:
-
Nuclear factor κB
- NMR:
-
Nuclear magnetic resonance
- PCR:
-
Polymerase chain reaction
- PMB:
-
Polymyxin B
- POD:
-
Peroxidase
- PRRs:
-
Pattern recognition receptors
- Syk:
-
Spleen tyrosine kinase
- TFA:
-
Trifluoroacetic acid
- TLR2:
-
Toll like receptor 2
- SDS:
-
Sodium dodecyl sulfate
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Acknowledgements
This work was supported by New Drug Creation and Manufacturing Program (2012ZX09301001-003), National Science Fund for Distinguished Young Scholars (81125025) and the funds for Industry-University-Research Institution Alliance in Guangdong Province, China (2010A090200041).
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Jianping Fang and Ying Wang contributed equally to this work.
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Fang, J., Wang, Y., Lv, X. et al. Structure of a β-glucan from Grifola frondosa and its antitumor effect by activating Dectin-1/Syk/NF-κB signaling. Glycoconj J 29, 365–377 (2012). https://doi.org/10.1007/s10719-012-9416-z
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DOI: https://doi.org/10.1007/s10719-012-9416-z