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  • Title: Paraoxonase 1 and platelet-activating factor acetylhydrolase activities in patients with low hdl-cholesterol levels with or without primary hypertriglyceridemia.
    Author: Brites FD, Verona J, Schreier LE, Fruchart JC, Castro GR, Wikinski RL.
    Journal: Arch Med Res; 2004; 35(3):235-40. PubMed ID: 15163466.
    Abstract:
    BACKGROUND: Previous studies have shown that high density lipoprotein (HDL)-deficient states are associated with reduced paraoxonase 1 (PON1) activity. However, HDL reduction caused by primary hypertriglyceridemia has not been fully explored. The aim of the present study was to evaluate whether PON1 and platelet-activating factor acetylhydrolase (PAF-AH), two antioxidant enzymes, were altered in patients with low HDL-cholesterol levels with or without primary hypertriglyceridemia in comparison with control normolipemic subjects. METHODS: We studied 24 patients with low HDL-cholesterol levels with (n=12) or without (n=12) primary hypertriglyceridemia in comparison with 12 control subjects who presented normal HDL-cholesterol and triglyceride levels. Paraoxon and phenylacetate were used as substrate for measuring PON1 activities and 1-hexadecyl-2-[3H]acetyl-glycero-3-phosphocholine for platelet-activating factor acetylhydrolase (PAF-AH) activity. Double substrate method was used to assign phenotypes. Lipid, lipoprotein, apolipoprotein, and lipoprotein particles were determined by standardized methods. RESULTS: Both PON1 activities were significantly reduced in patients with low HDL-cholesterol levels. This reduction could be selectively attributed to the hypertriglyceridemic subgroup. PAF-AH activity was not different between hypoalphalipoproteinemic patients and controls. PON1 activities correlated positively and significantly with HDL-cholesterol, HDL2-cholesterol, HDL3-cholesterol, HDL-phospholipids, apo A-I, apo A-II, and LpA-I:A-II. PAF-AH correlated positively and significantly with total and low density lipoprotein-cholesterol. CONCLUSIONS: Data from this study would suggest that in hypoalphalipoproteinemic syndrome, particularly when associated with hypertriglyceridemia, there is impairment in enzymatic antioxidant activity exclusively related with HDL.
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