1
|
Wu J, Tian Z, Sun Y, Lu C, Liu N, Gao Z, Zhang L, Dong S, Yang F, Zhong X, Xu C, Lu F, Zhang W. Exogenous H 2S facilitating ubiquitin aggregates clearance via autophagy attenuates type 2 diabetes-induced cardiomyopathy. Cell Death Dis 2017; 8:e2992. [PMID: 28796243 PMCID: PMC5596567 DOI: 10.1038/cddis.2017.380] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 07/04/2017] [Accepted: 07/06/2017] [Indexed: 12/21/2022]
Abstract
Diabetic cardiomyopathy (DCM) is a serious complication of diabetes. Hydrogen sulphide (H2S), a newly found gaseous signalling molecule, has an important role in many regulatory functions. The purpose of this study is to investigate the effects of exogenous H2S on autophagy and its possible mechanism in DCM induced by type II diabetes (T2DCM). In this study, we found that sodium hydrosulphide (NaHS) attenuated the augment in left ventricular (LV) mass and increased LV volume, decreased reactive oxygen species (ROS) production and ameliorated H2S production in the hearts of db/db mice. NaHS facilitated autophagosome content degradation, reduced the expression of P62 (a known substrate of autophagy) and increased the expression of microtubule-associated protein 1 light chain 3 II. It also increased the expression of autophagy-related protein 7 (ATG7) and Beclin1 in db/db mouse hearts. NaHS increased the expression of Kelch-like ECH-associated protein 1 (Keap-1) and reduced the ubiquitylation level in the hearts of db/db mice. 1,4-Dithiothreitol, an inhibitor of disulphide bonds, increased the ubiquitylation level of Keap-1, suppressed the expression of Keap-1 and abolished the effects of NaHS on ubiquitin aggregate clearance and ROS production in H9C2 cells treated with high glucose and palmitate. Overall, we concluded that exogenous H2S promoted ubiquitin aggregate clearance via autophagy, which might exert its antioxidative effect in db/db mouse myocardia. Moreover, exogenous H2S increased Keap-1 expression by suppressing its ubiquitylation, which might have an important role in ubiquitin aggregate clearance via autophagy. Our findings provide new insight into the mechanisms responsible for the antioxidative effects of H2S in the context of T2DCM.
Collapse
Affiliation(s)
- Jichao Wu
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Zhiliang Tian
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Yu Sun
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Cuicui Lu
- Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China
| | - Ning Liu
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Zhaopeng Gao
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Linxue Zhang
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Shiyun Dong
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Fan Yang
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Xin Zhong
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Changqing Xu
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China.,Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Fanghao Lu
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
| | - Weihua Zhang
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China.,Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| |
Collapse
|