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Int. J. Mol. Sci. 2015, 16(6), 12482-12498; doi:10.3390/ijms160612482

Urotensin II Protects Cardiomyocytes from Apoptosis Induced by Oxidative Stress through the CSE/H2S Pathway

1
Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
2
Department of Radiology, Shanghai First People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China
3
Department of Geriatrics, Zhongshan Hospital, Fudan University, Shanghai 200032, China
4
Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai 200032, China
These authors contribute equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: H. W. M. Niessen
Received: 9 May 2015 / Revised: 22 May 2015 / Accepted: 22 May 2015 / Published: 3 June 2015
(This article belongs to the Special Issue Improvement of Cardiac Function in Heart Failure)
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Abstract

Plasma urotensin II (UII) has been observed to be raised in patients with acute myocardial infarction; suggesting a possible cardiac protective role for this peptide. However, the molecular mechanism is unclear. Here, we treated cultured cardiomyocytes with H2O2 to induce oxidative stress; observed the effect of UII on H2O2-induced apoptosis and explored potential mechanisms. UII pretreatment significantly reduced the number of apoptotic cardiomyocytes induced by H2O2; and it partly abolished the increase of pro-apoptotic protein Bax and the decrease of anti-apoptotic protein Bcl-2 in cardiomyocytes induced by H2O2. SiRNA targeted to the urotensin II receptor (UT) greatly inhibited these effects. Further analysis revealed that UII increased the production of hydrogen sulfide (H2S) and the level of cystathionine-γ-lyase (CSE) by activating the ERK signaling in H2O2-treated-cardiomyocytes. Si-CSE or ERK inhibitor not only greatly inhibited the increase in CSE level or the phosphorylation of ERK induced by UII but also reversed anti-apoptosis of UII in H2O2-treated-cadiomyocytes. In conclusion, UII rapidly promoted the phosphorylation of ERK and upregulated CSE level and H2S production, which in turn activated ERK signaling to protect cardiomyocytes from apoptosis under oxidative stress. These results suggest that increased plasma UII level may protect cardiomyocytes at the early-phase of acute myocardial infarction in patients. View Full-Text
Keywords: urotensin II; apoptosis; cardiomyocyte; cystathionine-γ-lyase (CSE); hydrogen sulfide (H2S) urotensin II; apoptosis; cardiomyocyte; cystathionine-γ-lyase (CSE); hydrogen sulfide (H2S)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gong, H.; Chen, Z.; Zhang, X.; Li, Y.; Zhang, J.; Chen, Y.; Ding, Y.; Zhang, G.; Yang, C.; Zhu, Y.; Zou, Y. Urotensin II Protects Cardiomyocytes from Apoptosis Induced by Oxidative Stress through the CSE/H2S Pathway. Int. J. Mol. Sci. 2015, 16, 12482-12498.

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