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Facilitatory effects of fetuin-A on atherosclerosis.

Atherosclerosis. 2016 Mar;246:344-51. Epub 2016 Jan 22
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摘要


OBJECTIVE:Fetuin-A is a circulating glycoprotein that is produced by liver and adipose tissue. Fetuin-A is known to induce insulin resistance and suppress vascular calcification. There are conflicting reports that show increased or decreased serum fetuin-A levels in patients with coronary artery disease (CAD). Since the role of fetuin-A in atherosclerosis remains still controversial, we aimed to clarify it in this study. METHODS:We investigated the expression of fetuin-A in atheromatous plaques in CAD patients and restenosis lesions in balloon-injured rat carotid arteries in vivo. We also assessed in vitro effects of fetuin-A on inflammatory molecules in human umbilical vein endothelial cells (HUVECs), oxidized low-density lipoprotein-induced foam cell formation in human monocyte-derived macrophages, and the migration, proliferation, and extracellular matrix expression in human aortic smooth muscle cells (HASMCs) in a serum-free culture system. RESULTS:Fetuin-A was abundantly expressed in cultured human monocytes, macrophages, fibroblasts, HASMCs, and human coronary artery SMCs, atheromatous plaques in human coronary arteries, and restenosis lesions in rat carotid arteries. In vitro experiments showed that fetuin-A stimulated interleukin-6, monocyte chemotactic protein-1, intercellular adhesion molecule-1, and E-selectin expression in HUVECs. Fetuin-A enhanced macrophage foam cell formation associated with scavenger receptors (CD36 and SR-A) and acyl-CoA:cholesterol acyltransferase-1 up-regulation and ATP-binding cassette transporter A1 down-regulation, and increased cell proliferation and collagen-1 and -3 expression via PI3K/AKT/c-Src/NF-κB/ERK1/2 pathways in HASMCs. CONCLUSION:Our results indicate that fetuin-A exerts the stimulatory effects on inflammatory responses in HUVECs, macrophage foam cell formation, and proliferation and collagen production in HASMCs, leading to the development of atherosclerosis.

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