title: Lipoprotein-associated PAF-acetylhydrolase activity in subjects with the metabolic syndrome.
abstract: Plasma- and lipoprotein-associated activity of the platelet activating factor acetylhydrolase (PAF-acetylhydrolase, PAF-AH) plays an important role in inflammation and in atherosclerotic process, which are present in the metabolic syndrome (MS). Paraoxonase 1 (PON1) is an esterase associated with high-density lipoprotein (HDL) which contributes to the anti-atherogenic effects of this lipoprotein. We investigated the activities of both enzymes in 60 patients with MS and 110 age- and sex-matched subjects without it (non-MS group). Plasma PAF-AH activity was higher in the MS compared to the non-MS group, while HDL-PAF-AH and serum PON1 activities were lower in the MS compared to the non-MS group. Univariate regression analysis in the MS group showed that plasma PAF-AH activity was positively associated with systolic blood pressure, whereas HDL-PAF-AH activity was inversely associated with the homeostasis model assessments (HOMA) index. Both associations remained significant in the multivariate regression analysis, suggesting that insulin resistance and systolic hypertension are major determinants for the alterations in plasma and HDL-associated PAF-AH activity among those observed in MS patients.
authors.affiliation: School of Medicine, Department of Internal Medicine, University of Ioannina, Dourouti Campus, 45110 Ioannina, Greece.
authors.forename: Evangelos
authors.initials: E
authors.lastname: Rizos
authors.forename: Afroditi P
authors.initials: AP
authors.lastname: Tambaki
authors.forename: Irene
authors.initials: I
authors.lastname: Gazi
authors.forename: Alexandros D
authors.initials: AD
authors.lastname: Tselepis
authors.forename: Moses
authors.initials: M
authors.lastname: Elisaf
mesh_terms: D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase / Q000097:blood*; D043303:Aryldialkylphosphatase / Q000097:blood*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008075:Lipoproteins, HDL / Q000097:blood*; D008297:Male; D024821:Metabolic Syndrome / Q000201:enzymology*; D008875:Middle Aged; D012307:Risk Factors
chemical_list: D008075:Lipoproteins, HDL; D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase; D043303:Aryldialkylphosphatase; C468406:PON1 protein, human