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The cytochrome P450 mitochondrial enzyme 25-hydroxyvitamin D3 1alpha-hydroxylase (1alpha-hydroxylase) of renal tubule cells hydroxylates the major circulating form of vitamin D (25(OH)D3) to the active systemic hormone 1,25(OH)2D3. Local production of 1,25(OH)2D3 appears to occur also at other sites where 1alpha-hydroxylase is expressed for autocrine/paracrine regulation. To reduce risks of hypercalcemia during treatment with vitamin D, we have previously suggested use of non-1alpha-hydroxylated vitamin D analogues to target tissues where 1alpha-hydroxylase is expressed, including the parathyroid glands in secondary hyperparathyroidism. The present study was undertaken to examine expression of 1alpha-hydroxylase in breast cancer and to investigate whether a non-1alpha-hydroxylated vitamin D analogue displayed biological function. In addition, expression of the 25-hydroxyvitamin D3 24-hydroxylase (24-hydroxylase) and the vitamin D receptor (VDR) was investigated.
Pubmed ID: 16280049 RIS Download
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