AIMS It is thought that clopidogrel bioactivation and antiplatelet response are related to cytochrome P450 2C19 (CYP2C19). However, a recent study challenged this notion by proposing CYP2C19 as wholly irrelevant, while identifying paraoxonase-1 (PON1) and its Q192R polymorphism as the major driver of clopidogrel bioactivation and efficacy. The aim of this study was to systematically elucidate t...

BACKGROUND The aim of this study was to evaluate the association of maternal serum 25-hydroxyvitamin D, paraoxonase 1, and neutrophil-to-lymphocyte ratio in women having early spontaneous preterm birth without clinical chorioamnionitis. MATERIAL AND METHODS This study was prospectively administered in women referred to our obstetrics service with preterm labor that resulted in preterm birth (n=...

Membrane proteins play key roles in fundamental biological processes, such as transport of molecules, signalling, energy utilization, and maintenance of cell and tissue structures. Serum paraoxonase (PON1, EC 3.1.8.1.) is a protein of 354 amino acids with a molecular mass of 43 kDa is a high density lipid (HDL) associated, calcium-dependent enzyme whose 3D structure, active site residues and ph...

INTRODUCTION Serum paraoxonase-1 (PON1) retards the oxidation of low-density lipoprotein and cell membranes and is atheroprotective. Polymorphisms in the promoter region of the PON1 gene have been shown to affect serum PON1 levels and have been related to the presence of coronary heart disease (CHD) in some studies. However, contradictory results have been reported with regard to promoter regio...

Oxidative stress is involved in the pathogenesis of asthma. Paraoxonase 1 (PON1) and arylesterase are esterase enzymes displaying antioxidant characteristics. PON1 activity varies widely among individuals and ethnic groups, partly related to polymorphisms. The aim of this study was to determine the activities of PON1 and arylesterase including the phenotype distribution of PON1 in asthmatic pat...

background it has been proposed that reactive oxygen species (ros) is involved in the pathogenesis of various diseases. paraoxonase, a high-density lipoprotein associated enzyme, prevents low-density lipoproteins from oxidation. objectives the aim of the present study was to investigate the serum activities of paraoxonase-1 (pon-1), and aryleterase (are) as well as total antioxidant capacity (t...

The aim of this study was to determine whether the paraoxonase (PON1) status, i.e. PON1 activities and phenotypes (AA, AB and BB), and its relationship with lipid status are different in patients with type II diabetes as compared to healthy population. Diabetic group comprised 175 patients with type II diabetes mellitus (94 men and 81 women) who came to their regular control examination and too...

BACKGROUND/METHODS The association between nutritional status, antioxidant human paraoxonase-1 (PON1) activity and low grade inflammation in hemodialized (HD) patients with chronic kidney disease (CKD) is unclear. The aim of this study was to determine PON1 paraoxonase and lactonase activities, ADMA, adiponectin and leptin concentrations, and to clarify the relationship between paraoxonase acti...

human serum paraoxonase (pon) associated with high density lipoprotein (hdl) , has been postulated to have a role in protecting low-density lipoprotein (ldl) against oxidative damage, which has led to the proposal that pon is an anti-atherogenic and anti-inflammatory enzyme. it has genetic polymorphism at the 191 (r ->q) and two alloenzymes a and b and three phenotypes a, b, and ab. we examined...