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Enhanced Aortic Macrophage Lipid Accumulation and Inflammatory Response in LDL Receptor Null Mice Fed an Atherogenic Diet
Author(s) -
Wang Shu,
Wu Dayong,
Matthan Nirupa R.,
LamonFava Stefania,
Lecker Jaime L.,
Lichtenstein Alice H.
Publication year - 2010
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-010-3454-8
Subject(s) - lipidology , clinical chemistry , macrophage , medicine , endocrinology
Abstract The effect of an atherogenic diet on inflammatory response and elicited peritoneal macrophage (Mϕ) cholesterol accumulation in relation to aortic lesion formation was assessed in LDL receptor null (LDLr−/−) mice. Mice were fed an atherogenic or control diet for 32 weeks. The atherogenic relative to control diet resulted in significantly higher plasma monocyte chemoattractant protein‐1 (MCP‐1), tumor necrosis factor alpha (TNFα) and interleukin‐6 (IL‐6) concentrations, more aortic wall Mϕ deposition, higher serum non HDL‐cholesterol concentrations and total cholesterol to HDL‐cholesterol ratios, and greater accumulation of both aortic free and esterified cholesterol. Elicited peritoneal Mϕ selectively accumulated longer chain unsaturated fatty acids in their membrane, independent of the dietary fatty acid profile. Elicited peritoneal Mϕ isolated from mice fed the atherogenic relative to control diet had significantly less arachidonic acid levels, accumulated significantly higher esterified cholesterol, had significantly higher mRNA levels and secretion of MCP‐1, and mRNA and protein levels of ATP‐binding cassette A1. Diet treatment had no significant effect in elicited peritoneal Mϕ on TNFα and IL‐6 mRNA levels and secretion. These data suggest that the atherogenic relative to control diet resulted in higher plasma inflammatory factor concentrations, less favorable lipoprotein profile, higher elicited peritoneal Mϕ cholesterol accumulation and inflammatory factor secretion, and more aortic wall Mϕ deposition, which in turn were associated with greater aortic cholesterol accumulation.