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Title: Ceruloplasmin oxidase activity as a biomarker of lead exposure
Authors: Warin Leelakunakorn
Rosawan Sriworawit
Suganya Soontaros
Mahidol University
Chulalongkorn University
Keywords: Medicine;Pharmacology, Toxicology and Pharmaceutics
Issue Date: 1-Jan-2005
Citation: Journal of Occupational Health. Vol.47, No.1 (2005), 56-60
Abstract: The most sensitive method used in monitoring the blood lead-level is atomic absorption spectrophotometry. Its limitation due to its high cost has made delta-aminolaevulinic acid dehydratase (δ-ALAD) inhibition more popular. This work demonstrates that ceruloplasmin (Cp), the blue-colored copper containing alpha-2 globulin (α2 globulin) glycoprotein in serum, can serve as a high-potential biomarker for lead exposure. Sephadex G-200 column chromatography demonstrated that lead-intoxicated patient serum transferrin and ceruloplasmin are bound to lead. The ceruloplasmin's oxidase and δ-ALAD activities are reduced when the blood-lead level increases (thresholds of 10.0 and 12.5 μg/100 mL respectively), with a correlation coefficient of -0.8643 and -0.6785 which accurately estimate a blood lead level of 74.7% and 46.0%, respectively. When the blood-lead level was less than 20 μg/100 mL, correlation coefficients of -0.5785 and -0.6963 suggested that Cp may serve as a good biomarker. Other advantages in using Cp in monitoring the bloodlead level were its stability: the enzyme was more stable at -20°C, for more than 2 wk, and its practical and rapid determination procedure.
ISSN: 13419145
Appears in Collections:Scopus 2001-2005

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