Arginase I Induction by Modified Lipoproteins in Macrophages: A Peroxisome Proliferator-Activated Receptor-^g/^d-Mediated Effect that Links Lipid Metabolism and Immunity

Macrophages are phagocytic cells that play essential roles in innate immunity and lipid homeostasis. The uptake of modified lipoproteins is an important early event in the development of atherosclerosis. We analyzed the ability of modified low-density lipoprotein (LDL) (oxidized and acetylated) to a...

Full description

Saved in:
Bibliographic Details
Published in:Molecular endocrinology (Baltimore, Md.) Md.), 2008-06, Vol.22 (6), p.1394-1402
Main Authors: Gallardo-Soler, Alejandro, Gomez-Nieto, Carlos, Campo, Maria Luisa, Marathe, Chaitra, Tontonoz, Peter, Castrillo, Antonio, Corraliza, Ines
Format: Article
Language:English
Subjects:
Leishmania major
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Macrophages are phagocytic cells that play essential roles in innate immunity and lipid homeostasis. The uptake of modified lipoproteins is an important early event in the development of atherosclerosis. We analyzed the ability of modified low-density lipoprotein (LDL) (oxidized and acetylated) to alter the expression and activity of arginases (ArgI and ArgII) in macrophages. We show that ArgI expression is potently induced by both oxidized and acetylated LDL in macrophages. We further show that this effect is mediated by peroxisome proliferator-activated receptors (PPAR). ArgI expression is highly responsive to agonists for PPAR^g and PPAR^d but not PPAR^a. Moreover, the induction of ArgI by both PPAR agonists and IL-4 is blocked in macrophages from PPAR^g- and PPAR^d-deficient mice. Functionally, PPAR activity induces macrophage activation toward a more Th2 immune phenotype in a model of Leishmania major infection. We show that PPAR^g and -^d ligands promote intracellular amastigote growth in infected macrophages, and this effect is dependent on both PPAR expression and Arg activity. Collectively, our results strongly suggest that ArgI is a key marker of the alternative program triggered by PPAR in macrophages.
ISSN:0888-8809