ZFIN ID: ZDB-PUB-180223-14
Dusp6 attenuates Ras/MAPK signaling to limit zebrafish heart regeneration
Missinato, M.A., Saydmohammed, M., Zuppo, D.A., Rao, K.S., Opie, G.W., Kühn, B., Tsang, M.
Date: 2018
Source: Development (Cambridge, England)   145(5): (Journal)
Registered Authors: Tsang, Michael
Keywords: Dusp6, Ras/MAPK signaling, Zebrafish heart regeneration
Microarrays: GEO:GSE90595
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Cell Proliferation/genetics
  • Down-Regulation/genetics
  • Dual Specificity Phosphatase 6/physiology*
  • Heart/physiology*
  • MAP Kinase Signaling System/physiology*
  • Myocytes, Cardiac/physiology
  • Proto-Oncogene Proteins p21(ras)/metabolism*
  • Regeneration/genetics*
  • Signal Transduction/genetics
  • Zebrafish/physiology*
  • Zebrafish Proteins/physiology
PubMed: 29444893 Full text @ Development
Zebrafish regenerate cardiac tissue through proliferation of pre-existing cardiomyocytes and neovascularization. Secreted growth factors such as FGFs, IGF, PDGFs and Neuregulin play essential roles in stimulating cardiomyocyte proliferation. These factors activate the Ras/MAPK pathway, which is tightly controlled by the feedback attenuator Dual specificity phosphatase 6 (Dusp6), an ERK phosphatase. Here, we show that suppressing Dusp6 function enhances cardiac regeneration. Inactivation of Dusp6 by small molecules or by gene inactivation increased cardiomyocyte proliferation, coronary angiogenesis, and reduced fibrosis after ventricular resection. Inhibition of Erbb or PDGF receptor signaling suppressed cardiac regeneration in wild-type zebrafish, but had a milder effect on regeneration in dusp6 mutants. Moreover, in rat primary cardiomyocytes, NRG1-stimulated proliferation can be enhanced upon chemical inhibition of Dusp6 with BCI. Our results suggest that Dusp6 attenuates Ras/MAPK signaling during regeneration and that suppressing Dusp6 can enhance cardiac repair.