title: Physicochemical characteristics and antitumor activities of a highly branched fungal (1----3)-beta-D-glucan, OL-2, isolated from Omphalia lapidescens.
abstract: Physicochemical properties and antitumor activities of a fungal (1----3)-beta-D-glucan, OL-2, isolated from Leiwan (Omphalia lapidescens) were examined. OL-2 showed sharp signals on carbon-13 nuclear magnetic resonance spectrum in dimethylsulfoxide-d6 as a solvent, and these signals were significantly reduced by the addition of distilled water to the concentration of 20%. This phenomenon is consistent with the general property of the gel forming (1----3)-beta-D-glucan. Binding of OL-2 to Congo red induced a significant change of lambda max to a longer wavelength, and the concentration to induce gel to sol transition was about 0.7 N; in contrast, the concentration was about 0.2 N in the cases of SPG and curdlan. These observations suggested that the gel structure would be significantly stabilized in the case of OL-2. OL-2 showed no or low antitumor activity against the solid form of Sarcoma 180 by intraperitoneal and intralesional administrations; however, it was effective on the ascites form of Sarcoma 180. Of interest, OL-2 also showed significant antitumor activity against the ascites form of MH-134 when administered with 5-fluorouracil. These results indicated that OL-2 showed characteristic features regarding its physicochemical properties and antitumor activity.
authors.affiliation: Tokyo College of Pharmacy, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ohno
authors.forename: T
authors.initials: T
authors.lastname: Miura
authors.forename: K
authors.initials: K
authors.lastname: Saito
authors.forename: M
authors.initials: M
authors.lastname: Nishijima
authors.forename: T
authors.initials: T
authors.lastname: Miyazaki
authors.forename: T
authors.initials: T
authors.lastname: Yadomae
mesh_terms: D000363:Agaricales / Q000737:chemistry*; D000818:Animals; D000970:Antineoplastic Agents / Q000032:analysis* / Q000494:pharmacology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D051379:Mice; D008813:Mice, Inbred ICR; D012510:Sarcoma 180 / Q000188:drug therapy
chemical_list: D000970:Antineoplastic Agents