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Chen L, Zhao M, Li J, Wang Y, Bao Q, Wu S, Deng X, Tang X, Wu W, Liu X. Critical role of X-box binding protein 1 in NADPH oxidase 4-triggered cardiac hypertrophy is mediated by receptor interacting protein kinase 1. Cell Cycle 2016; 16:348-359. [PMID: 27929749 DOI: 10.1080/15384101.2016.1260210] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
NADPH oxidase 4 (NOX4) and the NOX4-related redox signaling are implicated in cardiac hypertrophy. NOX4 is interrelated with endoplasmic reticulum stress (ERS). Spliced X-box binding protein 1 (Xbp1s) is a key mediator of ERS while its role in cardiac hypertrophy is still poorly understood. Recently, receptor interacting protein kinase 1(RIPK1) has been increasingly reported to be associated with ERS. Therefore, we aimed to test the hypothesis that Xbp1s mediates NOX4-triggered cardiac hypertrophy via RIPK1 signaling. In the heart tissue of transverse aortic constriction (TAC) rats and in primary cultured neonatal cardiomyocytes(NCMs) treated with angiotensinII(AngII) or isoproterenol (ISO), NOX4 expression and reactive oxygen species (ROS) generation, and expression of Xbp1s as well as RIPK1-related phosphorylation of P65 subunit of NF-κB were elevated. Gene silencing of NOX4 by specific small interfering RNA (siRNA) significantly blocked the upregulation of NOX4, generation of ROS, splicing of Xbp1 and activation of the RIPK1-related NF-κB signaling, meanwhile attenuated cardiomyocyte hypertrophy. In addition, ROS scavenger (N-acetyl-L-cysteine, NAC) and NOX4 inhibitor GKT137831 reduced ROS generation and alleviated activation of Xbp1 and RIPK1-related NF-κB signaling. Furthermore, splicing of Xbp1 was responsible for the increase in RIPK1 expression in AngII or ISO-treated NCMs. Upregulated RIPK1 in turn activates NF-κB signaling in a kinase activity-independent manner. These findings suggest that Xbp1s plays an important role in NOX4-triggered cardiomyocyte hypertrophy via activating its downstream effector RIPK1, which may prove significant for the development of future therapeutic strategies.
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Affiliation(s)
- Li Chen
- a Department of Cardiology , West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Mingyue Zhao
- b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Junli Li
- b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Yu Wang
- c Laboratory of Molecular Diagnosis of Cancer , State Key Laboratory of Biotherapy, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Qinxue Bao
- a Department of Cardiology , West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Siyuan Wu
- b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Xueqin Deng
- d Department of Pathology , West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Xiaoju Tang
- b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Wenchao Wu
- b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
| | - Xiaojing Liu
- a Department of Cardiology , West China Hospital, Sichuan University , Chengdu , P.R. China.,b Laboratory of Cardiovascular Diseases , Regenerative Medicine Research Center, West China Hospital, Sichuan University , Chengdu , P.R. China
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Zhao Y, Li Y, Luo P, Gao Y, Yang J, Lao KH, Wang G, Cockerill G, Hu Y, Xu Q, Li T, Zeng L. XBP1 splicing triggers miR-150 transfer from smooth muscle cells to endothelial cells via extracellular vesicles. Sci Rep 2016; 6:28627. [PMID: 27338006 PMCID: PMC4919660 DOI: 10.1038/srep28627] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 06/06/2016] [Indexed: 12/23/2022] Open
Abstract
The interaction between endothelial cells (ECs) and smooth muscle cells (SMCs) plays a critical role in the maintenance of vessel wall homeostasis. The X-box binding protein 1 (XBP1) plays an important role in EC and SMC cellular functions. However, whether XBP1 is involved in EC-SMC interaction remains unclear. In this study, In vivo experiments with hindlimb ischemia models revealed that XBP1 deficiency in SMCs significantly attenuated angiogenesis in ischemic tissues, therefore retarded the foot blood perfusion recovery. In vitro studies indicated that either overexpression of the spliced XBP1 or treatment with platelet derived growth factor-BB up-regulated miR-150 expression and secretion via extracellular vesicles (EVs). The XBP1 splicing-mediated up-regulation of miR-150 might be due to increased stability. The SMC-derived EVs could trigger EC migration, which was abolished by miR-150 knockdown in SMCs, suggesting miR-150 is responsible for SMC-stimulated EC migration. The SMC-derived miR-150-containing EVs or premiR-150 transfection increased vascular endothelial growth factor (VEGF)-A mRNA and secretion in ECs. Both inhibitors SU5416 and LY294002 attenuated EVs-induced EC migration. This study demonstrates that XBP1 splicing in SMCs can control EC migration via SMC derived EVs-mediated miR-150 transfer and miR-150-driven VEGF-A/VEGFR/PI3K/Akt pathway activation, thereby modulating the maintenance of vessel wall homeostasis.
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Affiliation(s)
- Yue Zhao
- Department of Heart Centre, Tianjin Third Central Hospital, Tianjin 300170, China
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Yi Li
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Peiyi Luo
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Yingtang Gao
- Key Laboratory of Artificial Cell, Tianjin Third Central Hospital, Tianjin 300170, China
| | - Junyao Yang
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Ka-Hou Lao
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Gang Wang
- Department of Emergency Medicine, the Second Affiliated Hospital, School of Medicine, Xi’an Jiaotong University, Xi’an 710004, China
| | | | - Yanhua Hu
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Qingbo Xu
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
| | - Tong Li
- Department of Heart Centre, Tianjin Third Central Hospital, Tianjin 300170, China
- Key Laboratory of Artificial Cell, Tianjin Third Central Hospital, Tianjin 300170, China
| | - Lingfang Zeng
- Cardiovascular Division, King’s College London BHF centre, London SE5 9NU, United Kingdom
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