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• W2000950923 abstract "The effects of acute pharmacologic steroid treatment on skeletal and mineral metabolism were assessed in 56 multiple sclerosis patients who were to receive 1 g intravenous methylprednisolone for 10 days, followed by a 4 day intravenous and 28 day oral glucocorticoid taper. Serum and urine samples were obtained at baseline and then within 3 days, 1, 2, and 3 weeks after beginning steroids. A subset of patients (n = 11) had sampling throughout the 6 weeks of steroid administration and up to 8 weeks afterward. All mean basal biochemistries were normal except 25(OH)D, which was in the “insufficient” range (25-50 nM) at 40 nM. During and after steroid administration, there were no changes in ionized calcium, 25(OH)D, urinary hydroxyproline, or pyridinoline. There was an increase in 1,25(OH)2D and a decrease in serum phosphorus, accompanied by an increase in urinary phosphate clearance, within 3 days of administration (p < 0.006). Serum osteocalcin (BGP) decreased to below assay sensitivity limits within 3 days of steroid administration (p < 0.0002), increasing thereafter but remaining at 50% of baseline by the third week. PTH(1-84) increased to a peak at week 2 (p < 0.02), after both the 1,25(OH)2D peak and the serum phosphorus nadir. Tartrate-resistant acid phosphatase, urinary calcium, and urinary cyclic AMP all increased above baseline (p < 0.05) with a pattern similar to that of PTH. To investigate further the immediate effects of steroid administration, serum samples were obtained at the same four times on both the day before and the day after the first intravenous methylprednisolone dose in a randomly chosen subset of patients (n = 9). Serum phosphorus fell (p < 0.05) by 1 h after administration, associated with an immediate drop in the tubular maximum phosphate reabsorption concentration adjusted for glomerular filtration rate (TmP/GFR). Serum 1,25(OH)2D increased (p < 0.04) and BGP decreased (p < 0.0001) within 8 h after steroid administration. The decrease in serum phosphorus, increase in 1,25(OH)2D, and depression in BGP were all independent of PTH, which did not change during this time period. The profound drop in BGP was particularly significant given the rise in 1,25(OH)2D (a known stimulator of BGP synthesis). In conclusion, these studies support the theory that high-dose glucocorticoid administration causes primary depression of bone formation as well as primary effects on the kidney, including lowering the TmP/GFR and increasing 1,25(OH)2D, all before increasing PTH levels." @default.
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• W2000950923 date "2009-12-03" @default.
• W2000950923 modified "2023-10-11" @default.
• W2000950923 title "High-dose glucocorticoids in multiple sclerosis patients exert direct effects on the kidney and skeleton" @default.
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• W2000950923 doi "https://doi.org/10.1002/jbmr.5650090718" @default.
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