title: Interferon effect on glycosaminoglycans in mouse glioma in vitro.
abstract: The effect of mouse interferon alpha/beta (MuIFN alpha/beta) on the production of glycosaminoglycans (GAGs) by mouse glioma G-26 in vitro was evaluated. Two GAG species secreted extracellularly by the mouse glioma G-26 were isolated using cellulose acetate electrophoresis. They were identified as hyaluronic acid (HA) and chondroitin sulfate (CS) following enzymatic digestion with enzymes: hyaluronidase and chondroitinase ABC. Further characterization of CS by enzymatic digestion with specific chondroitinases for chondroitin 4-sulfate (CSA) and chondroitin 6-sulfate (CSC), revealed that the isolated CS was neither CSA nor CSC. Therefore, it may be either chondroitin sulfate B (CSB) (dermatan sulfate) or one of the 'chondroitin sulfate isomers' (D-H). The three day incubation of glioma G-26 cells with 8 x 10-8 x 10(4) U/ml of MuIFN alpha/beta resulted in a dose dependent inhibition of cell proliferation measured by 3H-thymidine incorporation and the MTT assay. The significant decrease of the CS (p < 0.008) but not the HA level, (measured densitometrically), was observed following 72 hours (hrs) incubation of G-26 cells with 8 x 10(3) U/ml of MuIFN alpha/beta (IFN treated cells: 0.03 +/- 0.007 integrated optical density (IOD); control cells: 0.07 +/- 0.01 IOD). The decreased CS production may be the underlying cause of IFN mediated inhibition of glioma cell proliferation.
authors.affiliation: University of South Florida, College of Medicine, Department of Neurology, Tampa.
authors.forename: M
authors.initials: M
authors.lastname: Wiranowska
authors.forename: A K
authors.initials: AK
authors.lastname: Naidu
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002809:Chondroitin Sulfates / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D005910:Glioma; D006025:Glycosaminoglycans / Q000096:biosynthesis* / Q000302:isolation & purification; D006820:Hyaluronic Acid / Q000096:biosynthesis; D007370:Interferon Type I / Q000494:pharmacology*; D007700:Kinetics; D051379:Mice; D014407:Tumor Cells, Cultured
chemical_list: D006025:Glycosaminoglycans; D007370:Interferon Type I; D006820:Hyaluronic Acid; D002809:Chondroitin Sulfates