title: Isolation and characterization of an anti-complementary polysaccharide D3-S1 from the roots of Bupleurum smithii.
abstract: The preliminary data from hemolytic assays indicated that the hot-water extract of the roots of Bupleurum smithii had anti-complementary activity. Further bioactivity-guided fractionation led to the isolation of D3-S1, a homogeneous form of acidic polysaccharide. D3-S1 was a branched polysaccharide with average molecular weight about 2,000,000 Da, composed of Ara, Gal and GalA in the ratio of 2.6:1.0:1.2, along with trace of Rha, Glc, Xyl and Man. Methylation analysis and NMR identified the linkages of the residues of D3-S1. Functional analysis showed that D3-S1 inhibited complement activation on both the classic and alternative pathways with CH(50) value of 0.34+/-0.02 mg/ml and AP(50) value of 0.081+/-0.003 mg/ml, respectively. Preliminary mechanism studies by using complement component depleted-sera indicated that D3-S1 selectively interacts with C1s, C3 and C4, but not C1q, C1r, C2, C5 and C9. The results suggested that D3-S1 could be of potential benefits in treatment of the complement-associated diseases.
authors.affiliation: School of Pharmacy, Fudan University, Shanghai, PR China.
authors.forename: Han
authors.initials: H
authors.lastname: Xu
authors.forename: Yunyi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jianwen
authors.initials: J
authors.lastname: Zhang
authors.forename: Daofeng
authors.initials: D
authors.lastname: Chen
mesh_terms: D000818:Animals; D029972:Bupleurum / Q000737:chemistry*; D051056:Complement Inactivating Agents / Q000302:isolation & purification / Q000494:pharmacology*; D004365:Drugs, Chinese Herbal / Q000302:isolation & purification / Q000494:pharmacology*; D004912:Erythrocytes / Q000187:drug effects / Q000276:immunology; D006461:Hemolysis / Q000187:drug effects; D018517:Plant Roots / Q000737:chemistry; D011134:Polysaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D012756:Sheep; D014867:Water / Q000737:chemistry
chemical_list: D051056:Complement Inactivating Agents; D004365:Drugs, Chinese Herbal; D011134:Polysaccharides; D014867:Water