title: Phosphoprotein extraction from the dentine/cementum complex of human tooth roots.
abstract: Root shards were placed in dialysis tubing and demineralized to completion in either 10% disodium EDTA, pH 7.4, 0.6 M HCl, 0.1 M HCl, 0.5 M acetic or 75 mM-25 mM lactic-acetic acids. The demineralized shards were then re-extracted with 0.05 M tris-HCl, 1.0 M NaCl. DEAE chromatography revealed that the major peak of the 0.6 M CHl and EDTA extracts contained organic phosphorus, whereas much less organic phosphorus was found in the major peak of the 0.1 M HCl extract. Analysis of the re-extracts gave a pattern opposite to that obtained from the initial extractions. Measurements of protein and organic phosphorus released during extraction and re-extraction confirmed these results. Staining of SDS-PAGE gels for phosphoprotein with Stains-All resulted in a blue smear in fractions containing organic phosphorus. Thus the extraction of phosphoproteins from human tooth roots differed depending upon the demineralizing conditions. This ability to remove phosphoprotein differentially will allow further investigation of the role of phosphoprotein in mineralization and remineralization.
authors.affiliation: Department of Pediatric Dentistry, University of Connecticut School of Dental Medicine, Farmington 06032.
authors.forename: S P
authors.initials: SP
authors.lastname: McCurdy
authors.forename: B H
authors.initials: BH
authors.lastname: Clarkson
authors.forename: R L
authors.initials: RL
authors.lastname: Speirs
authors.forename: F F
authors.initials: FF
authors.lastname: Feagin
mesh_terms: D000085:Acetates; D019342:Acetic Acid; D000293:Adolescent; D000328:Adult; D002648:Child; D002848:Chromatography, DEAE-Cellulose; D002852:Chromatography, Ion Exchange; D003739:Dental Cementum / Q000032:analysis*; D003804:Dentin / Q000032:analysis*; D004492:Edetic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D006851:Hydrochloric Acid; D007773:Lactates; D019344:Lactic Acid; D008875:Middle Aged; D010750:Phosphoproteins / Q000032:analysis*; D012967:Sodium Dodecyl Sulfate; D014092:Tooth Root / Q000032:analysis*
chemical_list: D000085:Acetates; D007773:Lactates; D010750:Phosphoproteins; D019344:Lactic Acid; D012967:Sodium Dodecyl Sulfate; D004492:Edetic Acid; D019342:Acetic Acid; D006851:Hydrochloric Acid