Vitamin D metabolites in serum from hypoparathyroid patients treated with vitamin D2 and 1 alpha-hydroxyvitamin D3

The Journal of Clinical Endocrinology and Metabolism
L Aksnes, D Aarskog

Abstract

Vitamin D and its metabolites 25-hydroxyvitamin D (25OHD), 24,25-dihydroxyvitamin D [24,25-(OH)2D], 25,26-(OH)2D, and 1,25-(OH)2D were measured after separation on high pressure liquid chromatography in sera from two hypoparathyroid patients treated with high doses of vitamin D2. Fractions with displacement activities in the competitive protein-binding assays were found which were not detectable in sera from controls not supplemented with vitamin D2. These fractions, presumably representing vitamin D2 metabolites, were quantitated separately from the vitamin D3 metabolites. After a change of treatment from milligram doses of vitamin D2 to microgram doses of 1 alpha OHD3, the serum metabolites of vitamin D2 and vitamin D3 were followed from 8-13 months. During the first 2-3 months, there was an initial relatively rapid fall in serum vitamin D2 levels and metabolites, followed by a slower decline. High levels of vitamin D2 metabolites were still present after 13 months. Taking into account the marked preponderance of 25OHD2 to 25OHD3, the relative concentration of (OH)2D3 metabolites were higher than expected, which might indicate a preferential 25OHD3 hydroxylation or alternatively, a more rapid degradation of vitamin D2 metabol...Continue Reading

Citations

Jun 1, 1989·Clinical Rheumatology·T Bardin, M Lequesne
Sep 1, 1982·Clinica Chimica Acta; International Journal of Clinical Chemistry·M ImawariT Osuga
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