Journal
PHYTOCHEMISTRY
Volume 71, Issue 2-3, Pages 280-293Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2009.10.001
Keywords
Astragalus mongholics Bunge; Leguminosae; Polysaccharides, beta-D-(1 -> 3,6)-Galactan; Oligosaccharide side-chain; Enzymatic digestion; Exo-beta-D-(1 -> 3)-galactanase; High performance anion-exchange chromatography Immunomodulating activity; Intestinal immune system; Peyer's patches
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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Thirteen polysaccharides isolated from an extract of the aerial portions of Astragalus mongholics Bunge demonstrated immunomodulating activity against Peyer's patch immunocompetent cells. Nine of the active polysaccharide fractions were composed of either arabinogalactans, pectic arabinogalactans or pectins. The activities of the arabinogalactans and pectic arabinogalactans were associated with beta-D(1 -> 3)-galactan moieties branched with beta-D-(1 -> 6)-galactooligosaccharide side-chains having degrees of polymerization of 8 or less. Degradation of the beta-D-(1 -> 3)-galactan or beta-D-(1 -> 6)-galactosyl side-chains in the arabinogalactans significantly decreased immunomodulating activity. Rhamnogalacturonan I (RG-I) with beta-D-(1 -> 3,6)-galactosyl side-chains having terminal beta-D-GlcA showed activity in the pectin-enriched fractions. Interestingly, the terminal GlcA was not required for activity of the arabinogalactan-enriched fractions, suggesting at least two different immunomodulating structures. (C) 2009 Elsevier Ltd. All rights reserved.
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