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  • X-linked hypophosphatemia  (2)
  • Springer  (2)
  • American Institute of Physics
  • Nature Publishing Group
  • Springer Nature
  • Taylor & Francis
  • 1980-1984  (2)
  • 1945-1949
Sammlung
Verlag/Herausgeber
  • Springer  (2)
  • American Institute of Physics
  • Nature Publishing Group
  • Springer Nature
  • Taylor & Francis
Erscheinungszeitraum
  • 1980-1984  (2)
  • 1945-1949
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 36 (1984), S. 662-667 
    ISSN: 1432-0827
    Schlagwort(e): Vitamin D ; Hyp ; X-linked hypophosphatemia ; Metabolic bone disease ; Mice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Summary Hyp mice are a model for human X-linked hypophosphatemia (vitamin D-resistant rickets.) To determine whether an abnormality of vitamin D metabolism exists in this disease, the profiles of the metabolites of vitamin D were determined in normal andHyp mouse plasma.Hyp and normal mice were fed a vitamin D-deficient diet and received 1,23H-vitamin D3 at 16 Ci/mmol by stomach tube at 5 ng/g body weight (0.21 µCi/g b.w.) on alternate days for 14 days. The dose of vitamin D given maintained near normal plasma 25-OH-vitamin D. Thus the mice were in a vitamin D-replete state with all metabolite pools labeled with3H. Plasma was collected from 4 normal and 4Hyp mice. The plasma was extracted, and the extracts were chromatographed separately for each mouse on an LH-20 column. Each major peak of radioactivity was rechromatographed using high performance liquid chromatography on a Zorbax-Sil column using solvent systems known to resolve several vitamin D metabolites. Twenty-one radioactive peaks were identified. The disintegrations per minute of3H in each peak were quantified and converted to plasma concentration using the known specific activity of the administered vitamin D. The 25-OH-vitamin D accounted for 55% of the circulating radioactivity, and 24,25-(OH)2-vitamin D accounted for 22%. The plasma levels of 24,25-(OH)2-vitamin D were similar to levels previously reported by us using protein binding assays. No peaks of radioactivity were missing in the plasma extracts of theHyp mice. Also there was no evidence that plasma 24,25-(OH)2-vitamin D was elevated in theHyp mice.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 35 (1983), S. 750-754 
    ISSN: 1432-0827
    Schlagwort(e): X-linked hypophosphatemia ; Hyp ; Milk ; Phosphate ; Rickets
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Summary Patients with X-linked hypophosphatemia and mice bearing theHyp gene have reduced renal tubular reabsorption of phosphate and an osteomalacic bone disease. To test if altered phosphate transport also exists in the mammary glands, milk was analyzed from normal (n=9) and heterozygousHyp (n=8) mice 14 days after giving birth. Inorganic phosphate, total phosphate, calcium, magnesium, sodium, and potassium were measured; percent cream, fat, water, and nonfat organic solids were measured; and protein was measured. No significant differences (NSD) were found except for greater sodium inHyp milk. There was also NSD in litter weight. The lactatingHyp had a lower body weight and remained hypophosphatemic relative to lactating normals, but both groups had higher plasma phosphate than nonlactating controls of the same genotype. The data suggest thatHyp mice can accumulate a normal amount of phosphate in their milk despite the plasma phosphate being two-thirds of normal. These data, with other recent reports of different organ systems, suggest that the altered phosphate transport activity may be restricted to the kidney.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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