Structural characterization and anti-inflammatory effect in hepatocytes of a galactoglucan from mycelium

• Published in: RSC advances 2019-03, Vol.9 (14), p.7664-7672
• Main Authors: Tang, Huiling, Nie, Wenbing, Xiao, Jinna, Zha, Zhengqi, Chen, Qiuli, Yin, Hongping
• Format: Article
• ISSN: 2046-2069
• DOI: 10.1039/c8ra10347j

The galactoglucan ACP2 was isolated from cultured Antrodia camphorata mycelium through anion-exchange column chromatography and Sephadex G-100 chromatography and shown to exhibit hepatoprotective function in L02 cells. Based on monosaccharide composition analysis, ACP2 was mainly composed of glucose, galactose, and 6-deoxyglucose in a molar ratio of 5 : 2 : 1. The average molecular weight of ACP2 was 1.93 × 10 4 Da. The primary structure of ACP2 was elucidated with Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry, and nuclear magnetic resonance spectroscopy. The results indicated the following composition: →6)-linked-β- d -Gal p -(1→, →6)-linked-α- d -Glc p -(1→, →3)-linked-α- d -Glc p -(1→, and →2,4)-linked-β- d -Glc p -(1→, with terminal 6-deoxy-α- d -Glc p and α- d -Glc p . ACP2 alleviated lipopolysaccharide-induced hepatocyte inflammation by down-regulating the expressions of COX-2, IL-1β, TNF-α and IL-6. The decreased expressions of TLR4, MyD88, NF-κB, and phosphorylated p38 in ACP2-treated L02 cells indicated that ACP2 might ameliorate inflammation through the TLR4 and p38/NF-κB signaling pathways. A previously undescribed polysaccharide ACP2 was isolated from Antrodia camphorata mycelium. ACP2 ameliorated hepatocyte inflammation through TLR4 and p38/NF-κB signal pathway.