Gremlin-1 Is an Inhibitor of Macrophage Migration Inhibitory Factor and Attenuates Atherosclerotic Plaque Growth in ApoE−/− Mice

• Published in: The Journal of biological chemistry 2013-11, Vol.288 (44), p.31635-31645
• Main Authors: Müller, Iris, Schönberger, Tanja, Schneider, Martina, Borst, Oliver, Ziegler, Melanie, Seizer, Peter, Leder, Christoph, Müller, Karin, Lang, Michael, Appenzeller, Florian, Lunov, Oleg, Büchele, Berthold, Fahrleitner, Manuela, Olbrich, Marcus, Langer, Harald, Geisler, Tobias, Lang, Florian, Chatterjee, Madhumita, de Boer, Jan Freark, Tietge, Uwe J.F., Bernhagen, Jürgen, Simmet, Thomas, Gawaz, Meinrad
• Format: Article
• Language: English
• Subjects: Animals; Apolipoproteins E; Atherosclerosis; Cell Biology; Chemokines; CHO Cells; Cricetinae; Cricetulus; Gene Expression Regulation; Humans; Inflammation; Intercellular Signaling Peptides and Proteins - genetics; Intercellular Signaling Peptides and Proteins - metabolism; Intercellular Signaling Peptides and Proteins - pharmacology; Intramolecular Oxidoreductases - biosynthesis; Intramolecular Oxidoreductases - genetics; Macrophage Migration-Inhibitory Factors - biosynthesis; Macrophage Migration-Inhibitory Factors - genetics; Macrophages - metabolism; Macrophages - pathology; Mice; Mice, Knockout; Monocytes; Plaque, Atherosclerotic - genetics; Plaque, Atherosclerotic - metabolism; Plaque, Atherosclerotic - pathology; Recombinant Fusion Proteins - metabolism; Recombinant Fusion Proteins - pharmacology; Tumor Necrosis Factor-alpha - biosynthesis; Tumor Necrosis Factor-alpha - genetics; Vascular Biology
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.M113.477745

Monocyte infiltration and macrophage formation are pivotal steps in atherosclerosis and plaque vulnerability. Gremlin-1/Drm is crucial in embryo-/organogenesis and has been shown to be expressed in the adult organism at sites of arterial injury and to inhibit monocyte migration. The purpose of the present study was to evaluate and characterize the role of Gremlin-1 in atherosclerosis. Here we report that Gremlin-1 is highly expressed primarily by monocytes/macrophages in aortic atherosclerotic lesions of ApoE−/− mice and is secreted from activated monocytes and during macrophage development in vitro. Gremlin-1 reduces macrophage formation by inhibiting macrophage migration inhibitory factor (MIF), a cytokine critically involved in atherosclerotic plaque progression and vulnerability. Gremlin-1 binds with high affinity to MIF (KD = 54 nm), as evidenced by surface plasmon resonance analysis and co-immunoprecipitation, and reduces MIF-induced release of TNF-α from macrophages. Treatment of ApoE−/− mice with a dimeric recombinant fusion protein, mGremlin1-Fc, but not with equimolar control Fc or inactivated mGremlin1-Fc, reduced TNF-α expression, the content of monocytes/macrophages of atherosclerotic lesions, and attenuated atheroprogression. The present data disclose that Gremlin-1 is an endogenous antagonist of MIF and define a role for Gremlin-1/MIF interaction in atherosclerosis. Results: Gremlin-1 binds with high affinity to macrophage migration inhibitory factor and attenuates the progression of atherosclerosis. Conclusion: We describe a novel mechanism that regulates foam cell formation and plaque growth. Significance: The findings disclose a new mechanism for the regulation of plaque growth and may open novel therapeutic strategies to control the progression of atherosclerosis.