PMID: 6107407Sep 20, 1980Paper

Metabolites of vitamin D in human vitamin-D deficiency: effect of vitamin D3 or 1,25-dihydroxycholecalciferol

Lancet
S E PapapoulosJ L O'Riordan

Abstract

Circulating concentrations of hydroxylated metabolites of vitamin D were measured in seven Asian patients with histologically proven osteomalacia before and during treatment with either cholecalciferol (vitamin D3) or 1,25-dihydroxycholecalciferol. All patients showed an excellent clinical and biochemical response to treatment irrespective of type of vitamin D administered. Circulating concentrations of 25-hydroxycholecalciferol and 24,25, 25,26, and 1,25 dihydroxycholecalciferols were abnormally low in the untreated patients. In five patients treated with small doses of cholecalciferol (3000 units, 75 micrograms daily) the concentration of 1,25-dihydroxycholecalciferol rose rapidly to normal and reached supra-normal levels within 72 h. Raised concentrations (up to 200 pg/ml) were sustained for several months and then started falling to normal. Serum 24,25 and 25,26 dihydroxycholecalciferols rose only gradually, after circulating 25-hydroxycholecalciferol concentration had increased to normal. In contrast, in the two patients who received 1,25-dihydroxycholecalciferol (1 microgram daily) serum concentrations of this metabolite rose to normal and only occasionally exceeded the upper limit of normal. The highest concentration obs...Continue Reading

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