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01-09-2018 | Hypoxia • Original Article

dl-Propargylglycine protects against myocardial injury induced by chronic intermittent hypoxia through inhibition of endoplasmic reticulum stress

Authors: Xiufang Zhou, Si Tang, Ke Hu, Zhan Zhang, Pei Liu, Yuchuan Luo, Jing Kang, Lifang Xu

Published in: Sleep and Breathing | Issue 3/2018

Abstract

Background

Chronic intermittent hypoxia (CIH), an important basis of the pathogenesis of organ damage induced by obstructive sleep apnea syndrome (OSAS), is associated with myocardial injury, such as left ventricular dysfunction, apoptosis, and oxidative stress. Endogenous hydrogen sulfide (H₂S) plays an important role in maintaining cardiovascular functions. Many studies have demonstrated that exogenous H₂S has protective effects against myocardial injury induced by various cardiovascular diseases, and inhibiting the generation of endogenous H₂S has opposite effects. However, the effect of dl-propargylglycine (PAG), an effective inhibitor of cystathionine γ-lyase (CSE)-synthesized H₂S, on the regulation myocardial injury remains controversial.

Purpose

The present study was aimed to explore the influence of PAG on myocardial injury induced in rats by CIH.

Methods

Sprague-Dawley rats were randomly divided into a normal control (NC) group, a CIH group, a NC + PAG group, and a CIH + PAG group. After establishing the CIH model in rats, blood pressure, left ventricular function, oxidative stress, apoptosis, and the level of endoplasmic reticulum (ER) stress were detected.

Results

In NC rats, PAG had no effect on blood pressure, but induced myocardial dysfunction and up-regulated oxidative stress and apoptosis of the myocardium. In the CIH + PAG group, pretreatment with PAG significantly reduced blood pressure and improved the left ventricular ejection fraction (LVEF) and the left ventricular fractional shortening (LVFS) compared to the CIH group. Significantly lower levels of oxidative stress, apoptosis, and the ER stress were detected in the CIH + PAG group than in the CIH group.

Conclusion

These results suggest that PAG can protect the myocardium against CIH-induced injury through inhibition of endoplasmic reticulum stress.

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Title: dl-Propargylglycine protects against myocardial injury induced by chronic intermittent hypoxia through inhibition of endoplasmic reticulum stress
Authors: Xiufang Zhou
Si Tang
Ke Hu
Zhan Zhang
Pei Liu
Yuchuan Luo
Jing Kang
Lifang Xu
Publication date: 01-09-2018
Publisher: Springer International Publishing
Published in: Sleep and Breathing / Issue 3/2018
Print ISSN: 1520-9512
Electronic ISSN: 1522-1709
DOI: https://doi.org/10.1007/s11325-018-1656-0

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Abstract

Background

Purpose

Methods

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