Fenofibrate induces HDL-associated PAF-AH but attenuates enzyme activity associated with apoB-containing lipoproteins (Journal article)

Tsimihodimos, V./ Kakafika, A./ Tambaki, A. P./ Bairaktari, E./ Chapman, M. J./ Elisaf, M./ Tselepis, A. D.

Human plasma platelet-activating factor acetylhydrolase (PAF-AH) is an enzyme associated mainly with the apolipoprotein B (apoB)-containing lipoproteins and primarily with LDL. A small proportion of enzymatic activity is also associated with HDL. Plasma paraoxonase 1 (PON1) Is an esterase exclusively associated with HDL. The effect of fenofibrate on PAF-AH and PON1 activities in patients with dyslipidemias of Types IIA, IIB, and IV were studied. Fenofibrate reduced plasma PAF-AH activity in all patient groups. In Type IIA patients, this reduction was mainly due to a fall in enzyme activity associated with the dense LDL subspecies, whereas in Type IIB and Type IV patients, it was due to the decrease in PAF-AH activity associated with both the VLDL+IDL and dense LDL subspecies. Drug therapy in Type IIB and Type IV patients significantly increased the HDL-associated PAF-AH activity due to the increase in enzyme activity associated with the HDL-3c subfraction. Fenofibrate did not affect serum PON1 activities toward paraoxon and phenylacetate in either patient group. The fenofibrate-induced elevation of HDL-associated PAF-AH activity in dyslipidemic patients of Type IIB and Type IV, as well as the reduction in enzyme activity associated with atherogenic apoB-containing lipoproteins in all patient groups, may represent a new and important antiatherogenic effect of this potent lipid-modulating agent.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: hyperlipidemia,platelet-activating factor-acetylhydrolase,paraoxonase,platelet-activating-factor,factor-acetylhydrolase activity,low-density-lipoprotein,human plasma,phospholipase a(2),apolipoprotein-e,coronary heart,ldl,paraoxonase,disease
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/7984
ISSN: 0022-2275
Link: <Go to ISI>://000183031000008
Publisher: Lipid Research, Inc.
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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