Glycoconjugate Journal

, Volume 29, Issue 5, pp 365–377

Structure of a β-glucan from Grifola frondosa and its antitumor effect by activating Dectin-1/Syk/NF-κB signaling

  • Jianping Fang
  • Ying Wang
  • Xiaofen Lv
  • Xiaokun Shen
  • Xinyan Ni
  • Kan Ding
Article

DOI: 10.1007/s10719-012-9416-z

Cite this article as:
Fang, J., Wang, Y., Lv, X. et al. Glycoconj J (2012) 29: 365. doi:10.1007/s10719-012-9416-z

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.

Keywords

β-glucan Grifola frondosa Biological response modifier Dectin-1 

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

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Jianping Fang
    • 1
  • Ying Wang
    • 1
  • Xiaofen Lv
    • 1
  • Xiaokun Shen
    • 1
  • Xinyan Ni
    • 1
  • Kan Ding
    • 1
  1. 1.Glycochemistry & Glycobiology Lab, Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiChina