Document Detail

Hydrogen peroxide primes heart regeneration with a derepression mechanism.
MedLine Citation:
PMID:  25124925     Owner:  NLM     Status:  Publisher    
While the adult human heart has very limited regenerative potential, the adult zebrafish heart can fully regenerate after 20% ventricular resection. Although previous reports suggest that developmental signaling pathways such as FGF and PDGF are reused in adult heart regeneration, the underlying intracellular mechanisms remain largely unknown. Here we show that H2O2 acts as a novel epicardial and myocardial signal to prime the heart for regeneration in adult zebrafish. Live imaging of intact hearts revealed highly localized H2O2 (∼30 μM) production in the epicardium and adjacent compact myocardium at the resection site. Decreasing H2O2 formation with the Duox inhibitors diphenyleneiodonium (DPI) or apocynin, or scavenging H2O2 by catalase overexpression markedly impaired cardiac regeneration while exogenous H2O2 rescued the inhibitory effects of DPI on cardiac regeneration, indicating that H2O2 is an essential and sufficient signal in this process. Mechanistically, elevated H2O2 destabilized the redox-sensitive phosphatase Dusp6 and hence increased the phosphorylation of Erk1/2. The Dusp6 inhibitor BCI achieved similar pro-regenerative effects while transgenic overexpression of dusp6 impaired cardiac regeneration. H2O2 plays a dual role in recruiting immune cells and promoting heart regeneration through two relatively independent pathways. We conclude that H2O2 potentially generated from Duox/Nox2 promotes heart regeneration in zebrafish by unleashing MAP kinase signaling through a derepression mechanism involving Dusp6.Cell Research advance online publication 15 August 2014; doi:10.1038/cr.2014.108.
Peidong Han; Xiao-Hai Zhou; Nannan Chang; Cheng-Lu Xiao; Shouyu Yan; He Ren; Xin-Zhuang Yang; Mei-Ling Zhang; Qing Wu; Boyang Tang; Ju-Peng Diao; Xiaojun Zhu; Chuanmao Zhang; Chuan-Yun Li; Heping Cheng; Jing-Wei Xiong
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-15
Journal Detail:
Title:  Cell research     Volume:  -     ISSN:  1748-7838     ISO Abbreviation:  Cell Res.     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-8-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9425763     Medline TA:  Cell Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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