title: Treatment of hemodialysis bone disease with 24,25-(OH)2D3 and 1,25-(OH)2D3 alone or in combination.
abstract: We studied the effects of vitamin D metabolites in 29 patients established on chronic hemodialysis. The patients were divided into four groups; one was treated with 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3] 0.5 microgram/day, one with 24R,25-dihydroxyvitamin D3 [24,25-(OH)2D3] 10 micrograms/day, and one with both metabolites. The control group was not given vitamin D. Plasma levels of both metabolites were low before treatment. 1,25-(OH)2D3 levels became normal, and 24,25-(OH)2D3 increased to supranormal levels after administration of the corresponding metabolite. Combined treatment produced still higher plasma levels of 24,25-(OH)2D3, suggesting an interaction between the two metabolites. Patients receiving 1,25-(OH)2D3 alone had a greater increase in plasma calcium than those receiving both metabolites. In control patients, hyperparathyroid bone disease worsened over the 10-month observation period. 1,25-(OH)2D3 improved hyperparathyroid bone disease in most patients, as reflected by a reduction in osteoclast and osteoblast numbers, but had no demonstrable effect on mild osteomalacia. 24,25-(OH)2D3 had no significant effect on plasma biochemistry or bone histology, and the effect of combined treatment on histology was similar to that of 1,25-(OH)2D3 alone. Stainable bone aluminum increased slightly in patients given 1,25-(OH)2D3, but aluminum did not affect the response to treatment. We conclude that 1,25-(OH)2D3 is a useful agent in the treatment of renal bone disease, but no therapeutic role is apparent for 24,25-(OH)2D3.
mesh_terms: D015650:24,25-Dihydroxyvitamin D 3; D000328:Adult; D000368:Aged; D000469:Alkaline Phosphatase / Q000097:blood; D000535:Aluminum / Q000378:metabolism; D001847:Bone Diseases / Q000097:blood / Q000188:drug therapy* / Q000209:etiology / Q000473:pathology; D002117:Calcitriol / Q000097:blood / Q000627:therapeutic use*; D002118:Calcium / Q000097:blood; D004100:Dihydroxycholecalciferols / Q000097:blood / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000150:complications; D007676:Kidney Failure, Chronic / Q000150:complications* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010018:Osteomalacia / Q000188:drug therapy / Q000209:etiology; D010281:Parathyroid Hormone / Q000097:blood; D010758:Phosphorus / Q000097:blood; D006435:Renal Dialysis
chemical_list: D004100:Dihydroxycholecalciferols; D010281:Parathyroid Hormone; D010758:Phosphorus; D015650:24,25-Dihydroxyvitamin D 3; D000535:Aluminum; D000469:Alkaline Phosphatase; D002117:Calcitriol; D002118:Calcium