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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 278 (1973), S. 435-440 
    ISSN: 1432-1912
    Keywords: Diphosphanates ; Vitamin D Metabolism ; 25-Hydroxycholecalciferol ; 1,25-Dihydroxycholecalciferol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The application of disodium dichloromethylene diphosphonate (Cl2MDP), a diphosphonate which is known to inhibit bone formation and bone destruction leads to changes in the metabolism of 25-Hydroxycholecalciferol. The concentration of the tissue active form of vitamin D, i.e. 1,25-Dihydroxycholecalciferol, was found to be markedly diminished in blood serum, kidney and intestine. It is discussed whether this finding is due to a direct effect of Cl2MDP on 25-Hydroxycholecalciferol-1-hydroxylase in the kidney or indirectly caused by a disturbance of the regulation of 1,25-Dihydroxycholecalciferol production.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 158 (1972), S. 194-204 
    ISSN: 1433-8580
    Keywords: Vitamin D ; Osteomalacia ; Anticonvulsant drugs ; Calcium retention ; Whole body counter ; Vitamin D-Stoffwechsel ; Osteomalacie ; Antikonvulsive Medikamente ; Calcium-Retention ; Ganzkörperzähler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden der Stoffwechsel und die Organverteilung von doppelt-markiertem Vitamin D3 (1,2-3H-4-14C-Cholecalciferol) an Ratten untersucht, die entweder mit Phenobarbital (PB) oder Diphenylhydantoin (DPH) behandelt waren. Während die DPH-behandelten Ratten ein Stoffwechselmuster und eine Organverteilung ähnlich den Normaltieren aufwiesen, hatten die mit PB behandelten Ratten am 3. Untersuchungstag eine höhere Konzentration von 25-Hydroxycholecalciferol im Serum und am 10. Tag der Untersuchung eine im Vergleich zu den Normaltieren und DPH-Ratten erniedrigte Radioaktivität in der Leber und Niere. Da jedoch die Calcium-Retention nicht nur in der PB-Gruppe, sondern auch in den DPH-Tieren erniedrigt gefunden wurde, kann derzeit noch nicht entschieden werden, ob die bei Epilepsiekranken nachweisbaren vorwiegend osteomalacischen Knochenveränderungen durch eine Störung des Vitamin D-Stoffwechsels verursacht werden.
    Notes: Summary The metabolism and the organ distribution of double-labelled vitamin D3 (1,2-3H-4-14C-cholecalciferol) has been investigated in rats receiving either phenobarbital (PB) or diphenylhydantoin (DPH). Whereas the DPH-treated rats showed a metabolic pattern and organ distribution comparable to the control animals, the PB-treated rats had a greater amount of radioactivity (mainly as 25-Hydroxycholecalciferol) in their serum at 3 days, and at 10 days they showed a reduced concentration of radioactivity in their liver and kidney. As the retention of47calcium was not only decreased in the PB-group but as well in the DPH-group, which showed an almost normal handling of the injected vitamin D3, it remains speculative, as to whether or not the PB-induced alterations in the metabolism of vitamin D are responsible for the reported occurence of osteomalacic bone disease in patients treated by anticonvulsants.
    Type of Medium: Electronic Resource
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