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• W1999608303 abstract "Background: Overexposure to lead may result in an increased risk for developing chronic renal failure (CRF) and hypertension. Subclinical lead poisoning is difficult to identify. Because the heme biosynthetic pathway is highly sensitive to lead, we considered the study of enzymes involved in this pathway as a method to detect an excessive body lead burden. Methods: Main concerns in assessing the heme pathway in patients with CRF were related to aminolevulinate dehydratase (ALAD) activity. We first selected a number of patients with CRF at a predialysis stage, subsequently dividing them into two groups after the EDTA mobilization test had determined whether lead pools were expanded. The study included 24 healthy controls, 12 patients with clinical plumbism and biochemical demonstration of lead poisoning (Pb-CONT), 18 patients with CRF with no evidence of high lead storage (CRF/−), and 8 patients with CRF with high urinary excretion of lead in contrast to normal blood lead levels (CRF/+). Results: As expected, symptoms of plumbism (Pb-CONT) were accompanied by an increased erythrocyte zinc-protoporphyrin-free protoporphyrin ratio and high urine coproporphyrin excretion, whereas both these values were within the normal range in all patients with CRF. CRF/− patients showed minor abnormalities of erythrocyte heme metabolism, such as low ALAD activity, both baseline and in vitro restored. The ALAD-restored ALAD ratio correlated closely with urine lead excretion; it was normal in healthy controls and CRF/− patients and significantly reduced in Pb-CONT and CRF/+ patients. Conclusion: The erythrocyte ALAD-restored ALAD ratio may be a useful tool to show otherwise subclinical lead poisoning in patients with CRF.© 2002 by the National Kidney Foundation, Inc." @default.
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• W1999608303 date "2002-07-01" @default.
• W1999608303 modified "2023-10-16" @default.
• W1999608303 title "Erythrocyte aminolevulinate dehydratase activity as a lead marker in patients with chronic renal failure" @default.
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• W1999608303 doi "https://doi.org/10.1053/ajkd.2002.33912" @default.
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