A glucagon-like peptide-1 analog liraglutide suppresses macrophage foam cell formation and atherosclerosis.

Abstract:

:Macrophage foam cell formation, characterized by cholesterol ester accumulation catalyzed by acyl-CoA:cholesterol acyltransferase 1 (ACAT1), is the hallmark of early atherogenesis. We previously demonstrated the suppressive effects of incretins, glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), on the development of atherosclerotic lesions in apolipoprotein E-deficient (apoE(-/-)) mice. The present study was performed to evaluate the suppressive effects of these incretins and GLP-1 analogs, such as exendin-4 and liraglutide, on human macrophage foam cell formation in vitro and those of liraglutide on atherosclerotic lesion development in apoE(-/-) mice. We investigated the suppressive effects of GLP-1, GIP, exendin-4, and liraglutide against oxidized low-density lipoprotein (oxLDL)-induced foam cell formation in primary cultured human monocyte-derived macrophages. Seventeen-week-old apoE(-/-) mice were administered a long-acting GLP-1 analog liraglutide by osmotic mini-pumps for 4 weeks. Aortic atherosclerosis, oxLDL-induced foam cell formation, and related gene expression in exudate peritoneal macrophages were determined in vivo and ex vivo. Receptors for GLP-1 and GIP were expressed at high levels in human aortic smooth muscle cells and monocytes, but at relatively low levels in human macrophages and foam cells. GLP-1, GIP, exendin-4, and liraglutide significantly suppressed oxLDL-induced foam cell formation mainly associated with ACAT1 down-regulation in human monocyte-derived macrophages. The infusion of liraglutide into apoE(-/-) mice significantly retarded atherosclerotic lesions with monocyte/macrophage infiltration in the aortic wall and suppressed foam cell formation and ACAT1 expression in macrophages. These findings indicate that liraglutide could prevent the development of atherosclerotic lesions by suppressing macrophage foam cell formation mainly associated with ACAT1 down-regulation.

journal_name

Peptides

journal_title

Peptides

authors

Tashiro Y,Sato K,Watanabe T,Nohtomi K,Terasaki M,Nagashima M,Hirano T

doi

10.1016/j.peptides.2013.12.015

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

19-26

eissn

0196-9781

issn

1873-5169

pii

S0196-9781(13)00431-2

journal_volume

54

pub_type

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