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The role of monocyte chemotactic protein-induced protein 1 (MCPIP1) in angiotensin II-induced macrophage apoptosis and vulnerable plaque formation.

Abstract：

:Atherosclerotic plaque rupture is the main cause of acute coronary syndrome (ACS). Angiotensin II (Ang II) and macrophage apoptosis are involved in the pathogenesis of atherosclerosis. However, the underlying mechanisms remain unclear. We aimed to address the role of monocyte chemotactic protein-induced protein 1 (MCPIP1) in Ang II-induced macrophage apoptosis and vulnerable plaque formation. In mouse peritoneal macrophages, Ang II promoted endoplasmic reticulum (ER) stress-dependent macrophage apoptosis. Ang II markedly upregulated the expression of MCPIP1 via activating p38 mitogen-activated protein kinase (p38 MAPK). Treatment with MCPIP1 shRNA downregulated ER stress-related proteins and decreased macrophage apoptosis induced by Ang II. Ang II also activated the AMP-activated protein kinase (AMPK) signaling in macrophages. Inhibition of AMPK reduced macrophage apoptosis by inhibiting the p38 MAPK/MCPIP1/ER stress pathway. Furthermore, blocking the Ang II type 1 receptor (AT1R) with losartan effectively inhibited Ang II-induced macrophage apoptosis and AMPK/p38 MAPK/MCPIP1/ER pathway activation. In the atherosclerotic vulnerable plaque model in mice, losartan inhibited the progression of atherosclerosis and transformed vulnerable plaque into a more stable phenotype. Moreover, losartan markedly decreased the number of CD68+TUNEL+, CD68+MCPIP1+, CD68+p-eIF2α+ and CD68+CHOP+ cells in the lesion area. Taken together, Ang II promotes macrophage apoptosis via the AMPK/p38 MAPK/MCPIP1/ER stress pathway in macrophages via its receptor AT1R, which may contribute to vulnerable plaque formation. Our study clarifies a novel regulatory role of MCPIP1 in Ang II-induced macrophage apoptosis and plaque instability, providing a potential therapeutic target for prevention of ACS.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Shu S,Zhang Y,Li W,Wang L,Wu Y,Yuan Z,Zhou J

doi

10.1016/j.bbrc.2019.05.145

subject

Has Abstract

pub_date

2019-07-23 00:00:00

pages

378-385

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(19)31041-1

journal_volume

515

pub_type

杂志文章

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