Novel serum paraoxonase activity assays are associated with coronary artery disease

• Published in: Clinical chemistry and laboratory medicine Vol. 47; no. 4; pp. 432 - 440
• Main Authors: Martinelli, Nicola, Girelli, Domenico, Olivieri, Oliviero, Guarini, Patrizia, Bassi, Antonella, Trabetti, Elisabetta, Friso, Simonetta, Pizzolo, Francesca, Bozzini, Claudia, Tenuti, Ilaria, Annarumma, Laura, Schiavon, Renzo, Franco Pignatti, Pier, Corrocher, Roberto
• Format: Journal Article
• Language: English
• Published: Berlin Walter de Gruyter 01.04.2009; De Gruyter
• Subjects: Aryldialkylphosphatase - metabolism; Biological and medical sciences; coronary artery disease; Coronary Artery Disease - blood; Coronary Artery Disease - diagnosis; Coronary Artery Disease - enzymology; DEPCyMCase activity; Female; General aspects; Humans; Immunoassay - methods; Investigative techniques, diagnostic techniques (general aspects); Male; Medical sciences; Middle Aged; Risk Factors; serum paraoxonase; TBBLase activity; coronary artery disease; serum paraoxonase; Enzyme; Cardiovascular disease; Esterases; Coronary heart disease; Biological activity; Assay; Medicine; Phosphoric triester hydrolases; Association; TBBLase activity; Clinical biology; Hydrolases; Serum; Aryldialkylphosphatase; DEPCyMCase activity
• ISSN: 1434-6621; 1437-4331
• DOI: 10.1515/CCLM.2009.108

Background: Serum paraoxonase (PON1) exerts antiatherogenic effects. Novel PON1 enzymatic tests have been recently developed: 5-thiobutyl butyrolactone (TBBL) estimates PON1 lactonase activity, whereas 7-O-diethylphosphoryl-3-cyano-4-methyl-7-hydroxycoumarin (DEPCyMC) is considered a surrogate marker of PON1 concentration. The TBBL to DEPCyMC ratio provides the normalized lactonase activity (NLA), which may reflect the degree of PON1 lactonase catalytic stimulation. The aim of this study was to evaluate for the first time TBBLase and DEPCyMCase activity in patients with coronary artery disease (CAD). Methods: An angiography-based case-control study was conducted, including 300 sex- and age-matched subjects [100 CAD-free, 100 CAD without myocardial infarction (MI) and 100 CAD with MI]. Results: A low DEPCyMCase activity (lowest vs. highest tertile: OR 2.96, 95% CI 1.18–7.43) and a high NLA (highest vs. lowest tertile: OR 3.25, 95% CI 1.28–8.26) were both associated with CAD, independent of classical atherosclerosis risk factors, lipid-lowering therapy and PON1 genotype. Total TBBLase activity was, however, not different in CAD compared to CAD-free subjects. Conclusions: Novel PON1 activity assays may be associated with CAD. In this study, CAD patients had low DEPCyMCase activity, a possible marker of low PON1 concentration, but showed a high stimulation of PON1 lactonase activity. Clin Chem Lab Med 2009;47:432–40.