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. 1983 Oct;72(4):1190–1199. doi: 10.1172/JCI111074

Impaired stimulation of 25-hydroxyvitamin D-24-hydroxylase in fibroblasts from a patient with vitamin D-dependent rickets, type II. A form of receptor-positive resistance to 1,25-dihydroxyvitamin D3.

J E Griffin, J E Zerwekh
PMCID: PMC370402  PMID: 6313754

Abstract

We describe studies of the molecular defect in 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3] action in cultured skin fibroblasts from a patient previously reported to have vitamin D-dependent rickets, type II. Binding of [3H]1,25-(OH)2D3 in fibroblast cytosol was normal with a Bmax (amount of high affinity binding) of 26 fmol/mg protein and a half-maximal saturation of 0.2 nM. Nuclear binding of [3H]1,25-(OH)2D3 following whole cell uptake was 1.5 fmol/micrograms DNA in patient fibroblasts compared with a range of 0.5-2.9 fmol/micrograms DNA in five control strains. The size of the [3H]1,25-(OH)2D3-receptor complex on sucrose density gradients, 3.8 S, was the same as in normal cells. This patient, therefore, appeared to have a receptor-positive form of resistance to 1,25-(OH)2D3. To document resistance to 1,25-(OH)2D3 in the fibroblasts we developed a method for detection of 1,25-(OH)2D3 action in normal skin fibroblasts. Following treatment of normal cell monolayers with 1,25-(OH)2D3 there was more than a 20-fold increase of 25-hydroxy-vitamin D-24-hydroxylase (24-hydroxylase) activity. Treatment of 10 control cell strains with 1,25-(OH)2D3 for 8 h increased the formation of 24,25-dihydroxy-vitamin D3 from 25-hydroxyvitamin D3 in cell sonicates from less than 0.02 to 0.11-0.27 pmol/min per mg protein. When cells from the patient with vitamin D-dependent rickets, type II were treated with 1,25-(OH)2D3 in a similar manner, maximal 24-hydroxylase activity was only 0.02 pmol/min per mg protein, less than a fifth the lower limit of normal. 24-Hydroxylase activity in fibroblasts from the parents of the patient increased normally following treatment with 1,25-(OH)2D3. We conclude that impaired induction of 24-hydroxylase in the presence of normal receptor binding is evidence for postreceptor resistance to the action of 1,25-(OH)2D3.

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Selected References

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