title: Modification of the proteoglycans of rat incisor dentin-predentin during in vivo fluorosis.
abstract: Proteoglycans (PGs) were isolated from the dentin-predentin of fluorotic and control rat incisor teeth using demineralization in EDTA, followed by extraction with 4 M guanidinium chloride in the presence of protease inhibitors. Differences in the behaviour of fluorotic and control PG were evident during purification by anion exchange chromatography on Q-Sepharose and MONO-Q interfaced with fast protein liquid chromatography. The PG from fluorotic teeth exhibited a more anionic profile, due to changes in glycosaminoglycan characteristics, since no apparent differences were evident between the respective core proteins, both of which were 45 kDa. The constituent glycosaminoglycan chains of fluorotic dentin were of lower molecular size and showed the additional presence of dermatan sulfate and heparan sulfate by comparison to nonfluorotic controls, where only chondroitin-4-sulfate was detected.
authors.affiliation: Department of Basic Dental Science, Dental School, University of Wales College of Medicine, Cardiff, UK. hallrc@cardiff.ac.uk
authors.forename: R C
authors.initials: RC
authors.lastname: Hall
authors.forename: G
authors.initials: G
authors.lastname: Embery
authors.forename: R J
authors.initials: RJ
authors.lastname: Waddington
mesh_terms: D000818:Animals; D000838:Anions; D002809:Chondroitin Sulfates / Q000032:analysis / Q000302:isolation & purification; D002847:Chromatography, Agarose; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid; D003648:Decalcification Technique; D003804:Dentin / Q000737:chemistry*; D003871:Dermatan Sulfate / Q000032:analysis / Q000302:isolation & purification; D004492:Edetic Acid; D009050:Fluorosis, Dental / Q000378:metabolism*; D006025:Glycosaminoglycans / Q000032:analysis / Q000302:isolation & purification; D019791:Guanidine; D006146:Guanidines; D006497:Heparan Sulfate / Q000032:analysis / Q000302:isolation & purification; D007180:Incisor; D008297:Male; D008968:Molecular Conformation; D008970:Molecular Weight; D011480:Protease Inhibitors; D011489:Protein Denaturation; D011509:Proteoglycans / Q000032:analysis* / Q000302:isolation & purification; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000838:Anions; D002809:Chondroitin Sulfates; D003871:Dermatan Sulfate; D004492:Edetic Acid; D006025:Glycosaminoglycans; D019791:Guanidine; D006146:Guanidines; D006497:Heparan Sulfate; D011480:Protease Inhibitors; D011509:Proteoglycans