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- W2040978086 abstract "A method for assay of 25-hydroxyvitamin D-24-hydroxylase (24-hydroxylase) activity in phytohemagglutinin (PHA)-stimulated lymphocytes was applied to determine whether vitamin D-dependent rickets type II (VDDR II) is hereditary. In normal lymphocytes incubated with PHA for 3 days, maximal and half-maximal responses of 24-hydroxylase were observed after exposure to 10(-8) mol/L and (1.3 +/- 0.4) x 10(-9) mol/L 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3], respectively. These responses were similar to those of cultured skin fibroblasts. In contrast, after exposure to 10(-8), 10(-7), and 10(-6) mol/L 1,25-(OH)2D3, no 24-hydroxylase activity was detected in cells from patients with VDDR II, and intermediate activity was observed in cells from their parents. These findings indicated the presence of an intracellular receptor-effector system for 1,25-(OH)2D3 in peripheral lymphocytes. Heterozygotes of VDDR II could be identified, and autosomal recessive inheritance of the disease was demonstrated. Detection of heterozygotes of this disease was not possible by assay of inhibition of thymidine incorporation, another marker of the function of 1,25-(OH)2D3 in PHA-stimulated lymphocytes. Therefore, assay of 24-hydroxylase induction reflected the receptor status more closely than assay of inhibition of DNA biosynthesis. The assay of 24-hydroxylase activity in PHA-stimulated lymphocytes described here will be useful for diagnosis of VDDR II and study of families of patients with this disease." @default.
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- W2040978086 title "25-Hydroxyvitamin D-24-Hydroxylase in Phytohemagglutinin-Stimulated Lymphocytes: Intermediate Bioresponse to 1,25-Dihydroxyvitamin D<sub>3</sub>of Cells from Parents of Patients with Vitamin DDependent Rickets type II*" @default.
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- W2040978086 doi "https://doi.org/10.1210/jcem-70-4-1068" @default.
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