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Dusp6 attenuates Ras/MAPK signaling to limit zebrafish heart regeneration

Maria A Missinato1, Manush Saydmohammed1, Daniel A Zuppo1

  • 1Department of Developmental Biology, University of Pittsburgh, School of Medicine, Pittsburgh, PA 15213, USA.

Development (Cambridge, England)
|February 16, 2018
PubMed

Insights

Suppressing Dual specificity phosphatase 6 (Dusp6) enhances cardiac regeneration in zebrafish by promoting cardiomyocyte proliferation and angiogenesis. This finding suggests Dusp6 inhibition as a potential therapeutic strategy for heart repair.

Area of Science:

  • Cardiovascular Biology
  • Regenerative Medicine
  • Molecular Signaling

Background:

  • Zebrafish possess remarkable cardiac regeneration capabilities, involving cardiomyocyte proliferation and neovascularization.
  • Growth factors (FGFs, IGF, PDGFs, Neuregulin) stimulate cardiomyocyte proliferation via the Ras/MAPK pathway.
  • Dual specificity phosphatase 6 (Dusp6) is a key negative regulator of this pathway.

Purpose of the Study:

  • To investigate the role of Dusp6 in cardiac regeneration.
  • To determine if suppressing Dusp6 function can enhance heart repair mechanisms.

Main Methods:

  • Ventricular resection in zebrafish models.
  • Genetic inactivation and small molecule inhibition of Dusp6.
  • Assessment of cardiomyocyte proliferation, angiogenesis, and fibrosis.
  • Inhibition of Erbb and PDGF receptor signaling.
  • Primary rat cardiomyocyte proliferation assays.

Main Results:

  • Dusp6 inactivation significantly increased cardiomyocyte proliferation, coronary angiogenesis, and reduced fibrosis post-injury.
  • While Erbb/PDGF receptor inhibition impaired regeneration in wild-type zebrafish, the effect was milder in Dusp6 mutants.
  • Chemical inhibition of Dusp6 amplified Neuregulin1-stimulated proliferation in rat cardiomyocytes.

Conclusions:

  • Dusp6 acts as a critical attenuator of Ras/MAPK signaling during cardiac regeneration.
  • Suppression of Dusp6 function represents a promising therapeutic avenue for enhancing cardiac repair.
Keywords:
Cardiac repairCardiomyocyte proliferationDual specificity phosphatase 6Heart regenerationRas/MAPK signalingZebrafish

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