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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 14 (1974), S. 59-65 
    ISSN: 1432-0827
    Keywords: Pulp ; Dentin ; Chondroitin ; Sulphate ; Biosynthesis ; Isotope
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des rats Wistar, âgés de six semaines, sont injectés par voie intrapéritonéale avec du (35S) sulfate de sodium. Les animaux sont sacrifiés après 1 h et les molaires sont extraites. La pulpe et le dentine sont isolées par flottation différencielle et les glycosaminoglycanes sont étudiés après décalcification et protéolyse. L'étude du produit par électrophorèse sur acétate de cellulose montre la présence d'un composant métachromatique simple qui est radioactif. Des analyses chimiques, la spectroscopie infra-rouge et la réactivité aux enzymes permettent d'identifier le produit comme du sulfate 4′ chondroitine. Les résultats apportent une preuve chimique directe de l'incorporation rapide du (35S) sulfate de sodium dans les glycosaminoglycanes sulfatés de la matrice organique de molaires de rats. Ce tissu est un modèle intéressant pour l'étude du métabolisme de la substance fondamentale du tissu conjonctif.
    Abstract: Zusammenfassung Sechs Wochen alte Wistar-Ratten erhielten Natrium-[35S]-Sulfat intraperitoneal. Die Tiere wurden 1 Std nach der Injektion getötet, und ihre Backenzähne wurden extrahiert. Pulpa und Dentin wurden mittels der Differential-Flotation isoliert und auf Glycosaminoglycane nach Entkalkung und Proteolyse untersucht. Die Prüfung des Produktes mittels Zellulose-Acetat-Elektrophorese zeigte die Anwesenheit einer einzigen metachromatischen Komponente, welche radioaktiv war. Chemische Analyse, Infrarot-Spektroskopie und enzymatische Spaltbarkeit erlaubten die Identifikation des Produktes als Chondroitin-4′-Sulfat. Die Resultate liefern den direkten chemischen Beweis, daß Natrium-[35S]-Sulfat rasch in die sulfatierten Glycosaminoglycane der organischen Matrix der Ratten-Backenzähne eingebaut wird und daß dieses Gewebe ein nützliches Modell ist, um den Stoffwechsel der Grundsubstanz des Bindegewebes zu untersuchen.
    Notes: Abstract Six-weeks-old Wistar rats were injected intraperitoneally with sodium [35S]sulphate. The animals were sacrificed after 1 h and the molar teeth were extracted. The pulp and dentine were isolated by differential flotation and examined for glycosaminoglycans following decalcification and proteolysis. Examination of the product by cellulose acetate electrophoresis revealed the presence of a single metachromatic component which was radioactive. Chemical analysis, infrared spectroscopy and enzymic susceptibility identified the product as chondroitin 4′ sulphate. The results provide direct chemical evidence that sodium [35S]sulphate is rapidly incorporated into the sulphated glycosaminoglycans of the organic matrix of the rat molar tooth and that this tissue is a useful model for investigating the metabolism of the connective tissue ground substance.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 52 (1993), S. 392-398 
    ISSN: 1432-0827
    Keywords: Fluoride ; Proteoglycans ; Odontoblasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Using an in vitro rat incisor odontoblast system, the effect of fluoride on proteoglycans was investigated at both the metabolic and structural level. Incisors were removed from 4-week-old rats, split longitudinally, and the pulps removed. Teeth were incubated at 37°C, 5% CO2 in Eagle's Minimum Essential Medium containing 35S-sulfate for 7 hours in the presence of 0 mM, 3 mM, or 6 mM sodium fluoride. Teeth were demineralized in EDTA, proteoglycan was extracted from the residue with 4 M guanidinium chloride, and further purified by anion exchange chromatography. Uptake of radiolabel was monitored by liquid scintillation counting. The resultant products were examined by cellulose acetate electrophoresis, SDS-PAGE, chondroitinase digestion, and amino acid analysis. Differential effects of fluoride were observed in both metabolism and biochemical characterization of proteoglycans following incubation at the two concentrations. Fluoride decreased uptake of the radiolabel but led to an accumulation of glycosaminoglycan within the proteoglycan of the matrix. Chondroitin sulfate was the predominant glycosaminoglycan identified, with the additional presence of dermatan sulfate and heparan sulfate identified. Dermatan sulfate levels increased in 3 mM-treated teeth. Fluoride-treated proteoglycans had a reduced molecular weight (200–90K to 180–79K); this reduction is primarily a result of smaller glycosaminoglycan chains, with limited reduction in the size of the core protein of 6 mM-treated teeth occurring. Such alterations in the biochemical metabolism and hence structure and function of proteoglycan may be implicated in the hypomineralization seen in fluorosis.
    Type of Medium: Electronic Resource
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