Despite antiatherogenic metabolic characteristics, SCD1-deficient mice have increased inflammation and atherosclerosis

Marcia L.E. MacDonald, Miranda Van Eck, Reeni B. Hildebrand, Brian W.C. Wong, Nagat Bissada, Piers Ruddle, Anatol Kontush, Hala Hussein, Mahmoud A. Pouladi, M. John Chapman, Catherine Fievet, Theo J.C. Van Berkel, Bart Staels, Bruce M. McManus, Michael R. Hayden

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Objective - Absence of stearoyl-CoA desaturase-1 (SCD1) in mice reduces plasma triglycerides and provides protection from obesity and insulin resistance, which would be predicted to be associated with reduced susceptibility to atherosclerosis. The aim of this study was to determine the effect of SCD1 deficiency on atherosclerosis. Methods and Results - Despite an antiatherogenic metabolic profile, SCD1 deficiency increases atherosclerosis in hyperlipidemic low-density lipoprotein receptor (LDLR)-deficient mice challenged with a Western diet. Lesion area at the aortic root is significantly increased in males and females in two models of SCD1 deficiency. Inflammatory changes are evident in the skin of these mice, including increased intercellular adhesion molecule (ICAM)-1 and ulcerative dermatitis. Increases in ICAM-1 and interleukin-6 are also evident in plasma of SCD1-deficient mice. HDL particles demonstrate changes associated with inflammation, including decreased plasma apoA-II and apoA-I and paraoxonase-1 and increased plasma serum amyloid A. Lipopolysaccharide-induced inflammatory response and cholesterol efflux are not altered in SCD1-deficient macrophages. In addition, when SCD1 deficiency is limited to bone marrow-derived cells, lesion size is not altered in LDLR-deficient mice. Conclusions - These studies reinforce the crucial role of chronic inflammation in promoting atherosclerosis, even in the presence of antiatherogenic biochemical and metabolic characteristics.

Original languageEnglish
Pages (from-to)341-347
Number of pages7
JournalArteriosclerosis, thrombosis, and vascular biology
Volume29
Issue number3
DOIs
StatePublished - Mar 2009

Keywords

  • Apolipoproteins
  • Atherosclerosis
  • Hyperlipoproteinemia
  • Inflammation
  • Lipoproteins

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