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Evidence-Based Complementary and Alternative Medicine
Volume 2013, Article ID 458075, 13 pages
Research Article

A Type II Arabinogalactan from Anoectochilus formosanus for G-CSF Production in Macrophages and Leukopenia Improvement in CT26-Bearing Mice Treated with 5-Fluorouracil

1Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan
2School of Medicine, Graduate Institute of Basic Medical Science and Tsuzuki Institute for Traditional Medicine, China Medical University, No. 91 Hsueh Shih Road, Taichung 40402, Taiwan

Received 19 June 2013; Revised 20 August 2013; Accepted 27 August 2013

Academic Editor: Tzeng-Ji Chen

Copyright © 2013 Li-Chan Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Anoectochilus formosanus is an herb well known in Asian countries. The polysaccharide isolated from A. formosanus consists of type II arabinogalactan (AGAF), with branched 3,6-Gal as the major moiety. In this study, AGAF was examined for the granulocyte colony-stimulating factor (G-CSF) production and related protein expression in RAW 264.7 murine macrophages. The signaling pathway of G-CSF production involves AGAF and mitogen-activated protein kinases (MAPKs) inhibitors and pattern-recognition receptor antibodies. AGAF was evaluated to ease the leukopenia in CT26-colon-cancer-bearing mice treated with 5-fluorouracil (5-FU). The results of this study showed that AGAF was a stimulant for Toll-like receptor 2 and Dectin-1 and that it induced G-CSF production, through p38 and ERK MAPK, and NF-κB pathways. In vivo examination showed that the oral administration of AGAF mitigated the side effects of leukopenia caused by 5-FU in colon-cancer-bearing mice. In conclusion, the botanic type II AGAF in this study was a potent G-CSF inducer in vivo and in vitro.