title: The role of natural biopolymers in genotoxicity of mutagens/carcinogens elimination.
abstract: Nowadays naturally occurring compounds with the potential antimutagenic and anticarcinogenic effects are of great importance for their prospective use in cancer chemoprevention and treatment. The new water soluble derivative of microbial polysaccharide beta-D-glucan-carboxymethyl glucan (CMG) belongs to such a category of natural substances. CMG isolated from the cell wall of baker's yeast Saccharomyces cerevisiae is included into the class of biopolymers known as biological response modifiers (BRMs) with a broad range of activities, above all ones interfering with cancer therapy. It was demonstrated on four experimental model systems that biological and consequential medicinal importance of CMG is based on the combined application with another active compound. In the Saccharomyces cerevisiae antimutagenicity assay CMG significantly reduced ofloxacin-induced mutagenicity in the yeast strain D7. CMG exerted bioprotective (anti-toxic and antimutagenic) effect after its simultaneos application with methyl methanesulphonate on the repair-deficient strain uvs10 of the unicellular green alga Chlamydomonas reinhardtii. In the Vicia sativa simultaneous phytotoxicity and anticlastogenicity assay CMG exerted statistically significant anticlastogenic efect against maleic hydrazide-induced clastogenicity in Vicia sativa L. Only in the Salmonella/microsome assay CMG did not exert statistically significant antigenotoxic effect, despite of the fact that it reduced 9-aminoacridine-induced mutagenicity in S. typhimurium TA97, but his(+) revertants decreasing was statistically significant only at the highest CMG concentration used. The data presented unambiguously documented that even biopolysaccharides (e.g., derivatives of beta-glucan) belonging to the most abundant class of natural biopolymers may contribute to cancer prevention and therapy.
authors.affiliation: Department of Genetics, Comenius University, Mlynská dolina, B-l, Bratislava, Slovak Republic. miadokova@fns.uniba.sk
authors.forename: Eva
authors.initials: E
authors.lastname: Miadoková
authors.forename: Sona
authors.initials: S
authors.lastname: Svidová
authors.forename: Viera
authors.initials: V
authors.lastname: Vlcková
authors.forename: Viola
authors.initials: V
authors.lastname: Dúhová
authors.forename: Eva
authors.initials: E
authors.lastname: Prazmáriová
authors.forename: Katarína
authors.initials: K
authors.lastname: Tothová
authors.forename: Slavomíra
authors.initials: S
authors.lastname: Nad'ová
authors.forename: Grigorij
authors.initials: G
authors.lastname: Kogan
authors.forename: Peter
authors.initials: P
authors.lastname: Rauko
mesh_terms: D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D016587:Antimutagenic Agents / Q000494:pharmacology*; D015197:Carcinogenicity Tests; D009152:Mutagenicity Tests; D047071:beta-Glucans / Q000494:pharmacology*
chemical_list: D016588:Anticarcinogenic Agents; D016587:Antimutagenic Agents; D047071:beta-Glucans; C029933:carboxymethyl-beta-1,3-glucan