title: Anti-cancer effect and structural characterization of endo-polysaccharide from cultivated mycelia of Inonotus obliquus.
abstract: The endo-polysaccharide extracted from mycelia of Inonotus obliquus (Pers.:Fr.) Pil. (Hymenochaetaceae) is a specific activator of B cells and macrophages. However, the in vivo anti-cancer effects and the chemical structure of the endo-polysaccharide are unknown. We purified the endo-polysaccharide, investigated its anti-cancer effects via in vitro and in vivo assays, and performed a structural characterization. The endo-polysaccharide was extracted from I. obliquus mycelia cultivated in a 300-l pilot fermenter, followed by hot water extraction and ethanol precipitation. Purification was achieved by DEAE-cellulose ion-exchange chromatography and gel-permeation chromatography. Chemical analysis revealed that the purified endo-polysaccharide is an alpha-linked fucoglucomannan with a molecular weight of approximately 1,000 kDa. The anti-cancer activities of the endo-polysaccharide against various types of tumor cells were determined. No direct toxicity against either cancer or normal cells was observed. Intraperitoneal administration of the endo-polysaccharide significantly prolonged the survival rate of B16F10-implanted mice, resulting in a 4.07-fold increase in the survival rate at a dose of 30 mg/kg/day. After 60 days of feeding, approximately 67% of the initial number of mice survived with no tumor incidence based on macroscopic examination. These results indicate that the anti-cancer effect of endo-polysaccharide is not directly tumorcidal but rather is immuno-stimulating.
authors.affiliation: Department of Biotechnology, College of Engineering, Yonsei University, Shinchon-dong, Seodaemoon-gu, Seoul 120-749, South Korea.
authors.forename: Yong Ook
authors.initials: YO
authors.lastname: Kim
authors.forename: Hae Woong
authors.initials: HW
authors.lastname: Park
authors.forename: Jong Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Seong Hoon
authors.initials: SH
authors.lastname: Moon
authors.forename: Chul Soo
authors.initials: CS
authors.lastname: Shin
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D000917:Antibody Formation / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D001487:Basidiomycota / Q000737:chemistry* / Q000235:genetics; D001835:Body Weight / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003470:Culture Media; D005260:Female; D006801:Humans; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008970:Molecular Weight; D025282:Mycelium / Q000737:chemistry*; D009368:Neoplasm Transplantation; D009569:Nitric Oxide / Q000096:biosynthesis; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D016019:Survival Analysis
chemical_list: D000903:Antibiotics, Antineoplastic; D003470:Culture Media; D011134:Polysaccharides; D009569:Nitric Oxide