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BAO, HongHui,YOU, SangGuan Japan Society for Bioscience, Biotechnology, and A 2011 Bioscience, biotechnology, and biochemistry Vol.75 No.5
<P>Water-soluble extracts isolated from <I>Hypsizigus marmoreus</I> and fractionated by ion-exchange chromatography were investigated to determine their molecular characteristics and biological activities. The crude and fractionated water-soluble extracts (F<SUB>1</SUB>, F<SUB>2</SUB> and F<SUB>3</SUB>) consisted mostly of carbohydrates (55.8–98.9%) with varied protein contents (1.1–23.0%). Their monosaccharide levels were significantly different, including the glucose content (67.0–100%) and galactose content (0–33.0%). The backbone of each fraction was mainly glucose molecules connected with 1,4-glycosidic linkages which contained considerable amounts of glucose and/or galactose connected through 1,6-glycosidic linkages. The average molecular weight (M<SUB>w</SUB>) of the extracts varied considerably, ranging from 1,665×10<SUP>4</SUP> to 19×10<SUP>4</SUP> g/mol. Little cytotoxicity was apparent in cancer cell lines from the addition of these extracts; however, they significantly stimulated Raw 264.7 cells to release nitric oxide (NO) and prostaglandin E<SUB>2</SUB> (PGE<SUB>2</SUB>), suggesting their potential immunomodulating activities.</P>