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Cardiovascular Diabetology
Published in: Cardiovascular Diabetology 1/2015

Open Access 01-12-2015 | Original investigation

Liraglutide attenuates high glucose-induced abnormal cell migration, proliferation, and apoptosis of vascular smooth muscle cells by activating the GLP-1 receptor, and inhibiting ERK1/2 and PI3K/Akt signaling pathways

Authors: Lili Shi, Ye Ji, Xiaoyan Jiang, Lihong Zhou, Ying Xu, Yanbo Li, Wei Jiang, Ping Meng, Xiaomin Liu

Published in: Cardiovascular Diabetology | Issue 1/2015

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Abstract

Background

As a new anti-diabetic medicine, Liraglutide (LIRA), one of GLP-1 analogues, has been found to have an anti-atherosclerotic effect. Since vascular smooth muscle cells (VSMCs) play pivotal roles in the occurrence of diabetic atherosclerosis, it is important to investigate the role of LIRA in reducing the harmful effects of high-glucose (HG) treatment in cultured VSMCs, and identifying associated molecular mechanisms.

Methods

Primary rat VSMCs were exposed to low or high glucose-containing medium with or without LIRA. They were challenged with HG in the presence of phosphatidylinositol 3-kinase (PI3K), extracellular signal-regulated kinase (ERK)1/2, or glucagon-like peptide receptor (GLP-1R) inhibitors. Cell proliferation and viability was evaluated using a Cell Counting Kit-8. Cell migration was determined by Transwell migration and scratch wound assays. Flow cytometry and Western blotting were used to determine apoptosis and protein expression, respectively.

Results

Under the HG treatment, VSMCs exhibited increased migration, proliferation, and phosphorylation of protein kinase B (Akt) and ERK1/2, along with reduced apoptosis (all p < 0.01 vs. control). These effects were significantly attenuated with LIRA co-treatment (all p < 0.05 vs. HG alone). Inhibition of PI3K kinase and ERK1/2 similarly attenuated the HG-induced effects (all p < 0.01 vs. HG alone). GLP-1R inhibitors effectively reversed the beneficial effects of LIRA on HG treatment (all p < 0.05).

Conclusions

HG treatment may induce abnormal phenotypes in VSMCs via PI3K and ERK1/2 signaling pathways activated by GLP-1R, and LIRA may protect cells from HG damage by acting on these same pathways.
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Metadata
Title
Liraglutide attenuates high glucose-induced abnormal cell migration, proliferation, and apoptosis of vascular smooth muscle cells by activating the GLP-1 receptor, and inhibiting ERK1/2 and PI3K/Akt signaling pathways
Authors
Lili Shi
Ye Ji
Xiaoyan Jiang
Lihong Zhou
Ying Xu
Yanbo Li
Wei Jiang
Ping Meng
Xiaomin Liu
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Cardiovascular Diabetology / Issue 1/2015
Electronic ISSN: 1475-2840
DOI
https://doi.org/10.1186/s12933-015-0177-4

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