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Arteriosclerosis, Thrombosis, and Vascular Biology. 2001;21:542-547

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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2001;21:542.)
© 2001 American Heart Association, Inc.


Atherosclerosis and Lipoproteins

Human Paraoxonase-3 Is an HDL-Associated Enzyme With Biological Activity Similar to Paraoxonase-1 Protein but Is Not Regulated by Oxidized Lipids

Srinivasa T. Reddy; David J. Wadleigh; Victor Grijalva; Carey Ng; Susan Hama; Aditya Gangopadhyay; Diana M. Shih; Aldons J. Lusis; Mohamad Navab; Alan M. Fogelman

From the Atherosclerosis Research Unit, Division of Cardiology, Department of Medicine (S.T.R., D.J.W., V.G., C.N., S.M., D.M.S., A.J.L., M.N., A.M.F.), the Department of Molecular and Medical Pharmacology (S.T.R.), and the Department of Microbiology, Immunology and Molecular Genetics (A.J.L.), University of California, Los Angeles, and the School of Medicine (A.G.), Vanderbilt University, Nashville, Tenn.

Correspondence to Srinivasa T. Reddy, PhD, Department of Medicine, and Department of Molecular and Medical Pharmacology, University of California, Los Angeles, 650 Charles E. Young Drive South, A8-131 CHS, Los Angeles, CA 90095. E-mail sreddy{at}mednet.ucla.edu

Abstract—Paraoxonase-1 (PON1) is a secreted protein associated primarily with high density lipoprotein (HDL) and participates in the prevention of low density lipoprotein (LDL) oxidation. Two other paraoxonase (PON) family members, namely, PON2 and PON3, have been identified. In this study, we report the cloning and characterization of the human PON3 gene from HepG2 cells. Tissue Northern analysis identifies an {approx}1.3-kb transcript for PON3 primarily in the liver. PON3-specific peptide antibodies detect an {approx}40-kDa protein associated with HDL and absent from LDL. Pretreatment of cultured human aortic endothelial cells with supernatants from HeLa Tet On cell lines overexpressing PON3 prevents the formation of mildly oxidized LDL and inactivates preformed mildly oxidized LDL. In contrast to PON1, PON3 is not active against the synthetic substrates paraoxon and phenylacetate. Furthermore, PON3 expression is not regulated in HepG2 cells by oxidized phospholipids and is not regulated in the livers of mice fed a high-fat atherogenic diet.


Key Words: paraoxonase • MM-LDL • PON3 • atherosclerosis • oxidized lipids




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