H2S Protects against Cardiac Cell Hypertrophy through Regulation of Selenoproteins

Author:

Greasley Adam12,Zhang Yanjie123,Wu Bo4,Pei Yanxi3ORCID,Belzile Nelson1ORCID,Yang Guangdong12ORCID

Affiliation:

1. Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Canada

2. Cardiovascular and Metabolic Research Unit, Laurentian University, Sudbury, Canada

3. School of Life Science, Shanxi University, Taiyuan, China

4. Department of Pathophysiology, Harbin Medical University, Harbin, China

Abstract

Cardiac hypertrophy is defined as the enlargement of the cardiac myocytes, leading to improper nourishment and oxygen supply due to the increased functional demand. This increased stress on the cardiac system commonly leads to myocardial infarction, contributing to 85% of all cardiac-related deaths. Cystathionine gamma-lyase- (CSE-) derived H2S is a novel gasotransmitter and plays a critical role in the preservation of cardiac functions. Selenocysteine lyase (SCLY) has been identified to produce H2Se, the selenium homologue of H2S. Deficiency of selenium is often found in Keshan disease, a congestive cardiomyopathy. The interaction of H2S and H2Se in cardiac cell hypertrophy has not been explored. In this study, cell viability was evaluated with a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Oxidative stress and cell size were observed through immunostaining. The expression of genes was determined by real-time PCR and western blot. Here, we demonstrated that incubation of rat cardiac cells (H9C2) with H2O2lead to increased oxidative stress and cell surface area, which were significantly attenuated by pretreatment of either H2S or H2Se. H2S incubation induced SCLY/H2Se signaling, which next caused higher expressions and activities of selenoproteins, including glutathione peroxidase and thioredoxin reductase. Furthermore, deficiency of CSE inhibited the expressions of SCLY and selenoprotein P in mouse heart tissues. We also found that both H2S and H2Se stimulated Nrf2-targeted downstream genes. These data suggests that H2S protects against cardiac hypertrophy through enhancement of a group of antioxidant proteins.

Funder

Heart and Stroke Foundation of Canada

Publisher

Hindawi Limited

Subject

Cell Biology,Aging,General Medicine,Biochemistry

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