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

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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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Acknowledgements

We appreciate the assistance of Dr. Jing Feng and Prof. Baoyuan Chen (Respiratory Department, Tianjin Medical University General Hospital, China) for their support with the intermittent hypoxia chamber and the gas control delivery system used in this study to establish the CIH rat model.

Funding

The National Natural Science Foundation of China provided financial support in the form of national natural science funding (Nos. 81070065 and 81370181). The sponsor had no role in the design or conduct of this research.

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Authors and Affiliations

  1. Division of Respiratory Disease, Renmin Hospital of Wuhan University, Zhangzhidong Road No. 99, Wuhan, 430060, China

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

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  1. Xiufang Zhou
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  2. Si Tang
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Correspondence to Ke Hu.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.

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Zhou, X., Tang, S., Hu, K. et al. dl-Propargylglycine protects against myocardial injury induced by chronic intermittent hypoxia through inhibition of endoplasmic reticulum stress. Sleep Breath 22, 853–863 (2018). https://doi.org/10.1007/s11325-018-1656-0

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