ABSTRACT
OBJECTIVE: To purify polysaccharides from Pteridium revolutum (Blume.) Nakai and determine their relative molecular weights, monosaccharide compositions and immunomodulating activities. METHODS: Crude polysaccharide was extracted from P. revolutum with hot water and then purified by DEAE Sepharose Fast Flow and Sephadex G-200 chromatography column after removing proteins by Seveg method. The immunomodulating activities of the polysaccharides were investigated on macrophage cells RAW264.7. RESULTS: Three homogenous polysaccharides, PRP0, PRP1 and PRP2, were obtained from the crude polysaccharide. Their molecular weights were 1.04×106, 8.39×105 and 7.37×105, respectively. Monosaccharide composition analysis by gas chromatography revealed that all three homogenous polysaccharides were composed of arabinose, fucose, galactose, mannose, glucose, rhamnose, and xylose in different ratios. The crude polysaccharide and three homogenous polysaccharides could promote the proliferation of RAW264.7 cells at the concentration of 12.5-100 μg·mL-1 and significantly induce the production of NO from RAW264.7 cells in a dose-dependent manner. CONCLUSION: P. revolutum polysaccharides can improve immunity activity.
ABSTRACT
OBJECTIVE: Auricularia polytricha is paid great attention to as an anticancer food, of which polysaccharide is an important functional component. The anticancer mechanism of Auricularia polytricha polysaccharide is critically important to its development and usage. METHODS: Five polysaccharides were isolated using counter-current chromatography and DEAE column chromatography from the wild Auricularia polytricha. RESULTS: AAPS1, AAPS2 and AAPS3 were light yellow floc, and AAFRB and AAFRC were white powder. The activities of the 5 polysaccharides on S180 sarcoma cell membrane were analyzed, and they could significantly change the characteristic of the tumor cell membrane, resulting in more free fatty acids. Among the 5 polysaccharides, AAPS2 showed the highest activity. The polysaccharides significantly lowered the levels of sialic acid (SA) in the cell membrane of tumor-bearing mice (P < 0.01), and AAPS2 had the highest activity than those of others. The polysaccharide AAPS2 could significantly alter membrane fluidity (P < 0.05). CONCLUSION: The anti-tumor mechanism may be related to the membrane glycoprotein and glycolipids chain terminal residues SA, and the peroxidation of lipid in cell membrane. Copyright 2012 by the Chinese Pharmaceutical Association.