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Previous Volume 316:1573-1577 June 18, 1987 Number 25 Next

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Abstract

This study examined the hypothesis that altered binding of 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) to parathyroid receptors might be involved in the pathogenesis of secondary hyperparathyroidism associated with chronic renal failure. The binding of [3H]1,25-(OH)2D3 to hyperplastic parathyroid glands obtained from seven patients with chronic renal failure was measured. These values were compared with those for binding to hyperplastic parathyroid tissue obtained from six patients who had received renal transplants and for binding to parathyroid adenomas removed from five patients who had primary hyperparathyroidism. We found that Nmax (an estimate of the concentration of 1,25-(OH)2D3 receptors) was reduced (42 +/- 15 fmol per milligram of protein) in patients with chronic renal failure as compared with patients with transplanted kidneys (78 +/- 24 fmol per milligram of protein) and patients with primary hyperparathyroidism (114 +/- 30). Nmax correlated inversely with the severity of renal dysfunction, the serum level of phosphorus, and the logarithm of the serum level of immunoreactive parathyroid hormone. These observations suggest that 1,25-(OH)2D3 binding by parathyroid tissue is reduced in chronic renal failure. This may contribute to the pathogenesis of secondary hyperparathyroidism by reducing the inhibition by 1,25-(OH)2D of parathyroid hormone secretion. The low serum levels of 1,25-(OH)2D in chronic renal failure may accentuate this effect.

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