Volume 59, Issue 6, Pages (June 2001)

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Volume 59, Issue 6, Pages 2273-2281 (June 2001) Sensitivity to meat protein intake and hyperoxaluria in idiopathic calcium stone formers  Quan-Vinh Nguyen, Agnes Kälin, Uschi Drouve, Jean-Paul Casez, Philippe Jaeger  Kidney International  Volume 59, Issue 6, Pages 2273-2281 (June 2001) DOI: 10.1046/j.1523-1755.2001.00744.x Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 1 Individual and mean changes in urinary oxalate excretion in controls and in idiopathic calcium stone formers (ICSFs) with or without mild metabolic hyperoxaluria (MMH), switching from a moderate protein (MPD) to a high protein diet (HPD). Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 2 Correlations between changes in urinary excretion of oxalate and changes in urinary excretion of glycolate or sulfate in controls and in ICSFs. Symbols are: (○) ICSF subjects without MMH; (•) ICSF with MMH. In (A), r = 0.55, P = 0.05; in (B), r = 0.50, P = 0.03; in (C) NS (not significant); in (D), r = 0.62, P = 0.003. Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 3 Urinary excretion of 4-pyridoxic acid (B) and serum concentration of pyridoxal-5′-phosphate (A) in subjects on a high-protein diet (HPD). Symbols are: (○) ICSFs with a significant HPD-induced rise in urinary oxalate excretion; (•) ICSF with normal urinary oxalate levels. Horizontal lines are the lower normal limits (percentile 2.5). Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 4 Correlations between serum concentration of pyridoxal-5′-phosphate and urinary excretion of 4-pyridoxic acid in controls (A) and in ICSFs (B) on a high-protein diet (HPD). Open circles represent ICSF without MMH, and the bar across the circle indicates a significant HPD-induced rise in urinary oxalate excretion. In (A), r = -0.26, P = 0.39; in (B), r = 0.48, P = 0.03. Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 5 Correlations between urinary oxalate excretion and serum concentration of pyridoxal-5′-phosphate in controls (A) and in ICSFs (B) on a high-protein diet (HPD). Open circles represent ICSF without MMH, and the bar across the circle indicates a significant HPD-induced rise in urinary oxalate excretion. In (A), r = 0.69, P < 0.01; in (B), NS (not significant). Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions

Figure 6 Metabolic pathways from meat proteins to oxalate. Shaded circles correspond to various enzymes: AGT, alanine-glyoxylate aminotransferase; GR, glyoxylate reductase; GO, glycolate oxidase; LDH, lactate dehydrogenase. AGT deficiency causes type 1 primary hyperoxaluria, where glyoxylate cannot be metabolized to glycine, leading both glycolate and oxalate to accumulate. Vitamin B6 supplementation may partially or completely correct the metabolic disorder. Kidney International 2001 59, 2273-2281DOI: (10.1046/j.1523-1755.2001.00744.x) Copyright © 2001 International Society of Nephrology Terms and Conditions