title: Bioactive capsular polysaccharide from the thermophilic cyanophyte/cyanobacterium Mastigocladus laminosus - cytotoxic properties.
abstract: The capsular polysaccharide produced by the thermophilic blue green alga/cyanobacterium Mastigocladus laminosus was tested for its cytotoxic activity against the A431 human epidermoid carcinoma cell line. This polysaccharide inhibited the proliferation of A431 cells in a dose-dependent manner with an IC (50) value of 50 microg mL (-1). In addition, this polysaccharide strongly inhibited A431 cell migration and invasion. Preliminary experiments showing that secretion of metalloproteinases MMP2 and MMP9 by A431 tumour cells was inhibited by this polysaccharide suggest that this mechanism of action could play a role in its anti-migration and anti-invasive properties. Acid hydrolysis of the polysaccharide produced specific oligosaccharides which conserved - at similar concentrations - their cytotoxic, anti-migration and anti-invasion properties; in this case, the mechanism of action was nevertheless uncorrelated to the decrease of metalloproteinase expression.
authors.affiliation: Laboratoire de Chimie des Substances Naturelles, Université de Limoges, Limoges, France. vincent.gloaguen@unilim.fr
authors.forename: Vincent
authors.initials: V
authors.lastname: Gloaguen
authors.forename: Henri
authors.initials: H
authors.lastname: Morvan
authors.forename: Lucien
authors.initials: L
authors.lastname: Hoffmann
authors.forename: Odile Sainte
authors.initials: OS
authors.lastname: Catherine
authors.forename: Michel
authors.initials: M
authors.lastname: Kraemer
authors.forename: Pierre
authors.initials: P
authors.lastname: Krausz
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D045744:Cell Line, Tumor / Q000187:drug effects / Q000378:metabolism; D002465:Cell Movement / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D000458:Cyanobacteria; D004305:Dose-Response Relationship, Drug; D006801:Humans; D020128:Inhibitory Concentration 50; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D008517:Phytotherapy; D011134:Polysaccharides / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D011134:Polysaccharides; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9