Journal
CIRCULATION RESEARCH
Volume 110, Issue 3, Pages 428-U147Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCRESAHA.111.260760
Keywords
Nur77; NR4A1; polarization; atherosclerosis; bone marrow transplantation
Funding
- Dutch Heart Foundation, The Hague [2008B037]
- Dutch Ministry of Economic Affairs
- Dutch Heart Foundation
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Rationale: Nuclear receptor Nur77, also known as NR4A1, TR3, or NGFI-B, is expressed in human atherosclerotic lesions in macrophages, endothelial cells, T cells and smooth muscle cells. Macrophages play a critical role in atherosclerosis and the function of Nur77 in lesion macrophages has not yet been investigated. Objective: This study aims to delineate the function of Nur77 in macrophages and to assess the effect of bone marrow-specific deficiency of Nur77 on atherosclerosis. Methods and Results: We investigated Nur77 in macrophage polarization using bone marrow-derived macrophages (BMM) from wild-type and Nur77-knockout (Nur77(-/-))mice. Nur77(-/-) BMM exhibit changed expression of M2-specific markers and an inflammatory M1-phenotype with enhanced expression of interleukin-12, IFN gamma, and SDF-1 alpha and increased NO synthesis in (non)-stimulated Nur77(-/-) BMM cells. SDF-1 alpha expression in nonstimulated Nur77(-/-) BMM is repressed by Nur77 and the chemoattractive activity of Nur77(-/-) BMM is abolished by SDF-1 alpha inhibiting antibodies. Furthermore, Nur77(-/-) mice show enhanced thioglycollate-elicited migration of macrophages and B cells. The effect of bone marrow-specific deficiency of Nur77 on atherosclerosis was studied in low density lipoprotein receptor-deficient (Ldlr(-/-)) mice. Ldlr(-/-) mice with a Nur77(-/-)-deficient bone marrow transplant developed 2.1-fold larger atherosclerotic lesions than wild-type bone marrow-transplanted mice. These lesions contain more macrophages, T cells, smooth muscle cells and larger necrotic cores. SDF-1 alpha expression is higher in lesions of Nur77(-/-)-transplanted mice, which may explain the observed aggravation of lesion formation. Conclusions: In conclusion, in bone marrow-derived cells the nuclear receptor Nur77 has an anti-inflammatory function, represses SDF-1 alpha expression and inhibits atherosclerosis. (Circ Res. 2012;110:428-438.)
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