-Endorphin Mediates the Development and Instability of Atherosclerotic Plaques

Overview

Journal Int J Endocrinol

Publisher Wiley

Specialty Endocrinology

Date 2020 Apr 21

PMID 32308678

Citations 4

Authors

Taisuke Okano

Kengo Sato

Remina Shirai

Tomomi Seki

Koichiro Shibata

Tomoyuki Yamashita

Ayaka Koide

Hitomi Tezuka

Yusaku Mori

Tsutomu Hirano

Takuya Watanabe

Affiliations

Soon will be listed here.

Abstract

-Endorphin, an endogenous opioid peptide, and its -opioid receptor are expressed in brain, liver, and peripheral tissues. -Endorphin induces endothelial dysfunction and is related to insulin resistance. We clarified the effects of -endorphin on atherosclerosis. We assessed the effects of -endorphin on the inflammatory response and monocyte adhesion in human umbilical vein endothelial cells (HUVECs), foam cell formation, and the inflammatory phenotype in THP-1 monocyte-derived macrophages, and migration and proliferation of human aortic smooth muscle cells (HASMCs) in vitro. We also assessed the effects of -endorphin on aortic lesions in mice in vivo. The -opioid receptor (OPRM1) was expressed in THP-1 monocytes, macrophages, HASMCs, HUVECs, and human aortic endothelial cells. -Endorphin significantly increased THP-1 monocyte adhesion to HUVECs and induced upregulation of intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and E-selectin via nuclear factor-B (NF-B) and p38 phosphorylation in HUVECs. -Endorphin significantly increased HUVEC proliferation and enhanced oxidized low-density lipoprotein-induced foam cell formation in macrophages. -Endorphin also significantly shifted the macrophage phenotype to proinflammatory M1 rather than anti-inflammatory M2 via NF-B phosphorylation during monocyte-macrophage differentiation and increased migration and apoptosis in association with c-jun-N-terminal kinase, p38, and NF-B phosphorylation in HASMCs. Chronic -endorphin infusion into mice significantly aggravated the development of aortic atherosclerotic lesions, with an increase in vascular inflammation and the intraplaque macrophage/smooth muscle cell ratio, an index of plaque instability. Our study provides the first evidence that -endorphin contributes to the acceleration of the progression and instability of atheromatous plaques. Thus, -opioid receptor antagonists may be useful for the prevention and treatment of atherosclerosis.

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