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- W2068800940 abstract "Aluminum toxicity is the presumed cause of aluminum-associated osteomalacia. In animal models, osteomalacia has been produced after a prolonged course of aluminum. In the present study, rats with renal failure received 20 mg intraperitoneal aluminum during a 2 day period. This model allows sequential observations in the development of osteomalacia. Rats were sacrificed and studied 5, 12, 25, and 40 days after aluminum administration. No differences were observed in serum calcium, phosphorus, or creatinine as a consequence of aluminum administration. Compared with control rats, parathyroid hormone was decreased at 12 and 25 days. A direct correlation was present between plasma and bone aluminum at 12 days (r = 0.92, p < 0.01), 25 days (r = 0.85, p < 0.005), and 40 days (r = 0.88, p < 0.001) but not 5 days after aluminum administration. Plasma aluminum peaked at 5 days (727 ± 89 μg/liter, mean ± SEM) and bone aluminum at 40 days (273 ± 40 μg/g). Aluminum had profound effect on bone histology. At 5 days there was a decrease in osteoblast surface and osteoid surface; at 12 days osteoblast surface and osteoid surface returned to normal but osteoclast surface decreased. Subsequently there was a progressive increase in osteoid surface and osteoid volume. Bone formation rate measured at 12, 25, and 40 days was decreased at these intervals. In conclusion, (1) high plasma aluminum may be directly toxic to the osteoblast; (2) progressive osteoid accumulation is secondary to matrix (osteoid) deposition, which exceeds the depressed bone formation rate; (3) the progressive decrease in plasma aluminum and increase in bone aluminum suggest that bone has a high affinity for aluminum but may have a relatively slow rate of uptake at any given time; (4) aluminum may directly decrease parathyroid hormone; (5) the correlation between plasma and bone aluminum suggest an exchange is present; and (6) aluminum toxicity may independently affect the osteoblast and bone mineralization." @default.
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- W2068800940 date "2009-12-03" @default.
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- W2068800940 title "The evolution of osteomalacia in the rat with acute aluminum toxicity" @default.
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- W2068800940 doi "https://doi.org/10.1002/jbmr.5650040507" @default.
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