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Related Experiment Video

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Intrathoracic Injection for the Study of Adult Zebrafish Heart
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Nitrite Improves Heart Regeneration in Zebrafish.

Elizabeth R Rochon1, Maria Azzurra Missinato2, Jianmin Xue1

  • 1Department of Medicine, Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania.

Antioxidants & Redox Signaling
|November 15, 2019
PubMed
Summary

Nitrite treatment accelerates zebrafish heart regeneration by promoting cardiomyocyte proliferation and blood vessel growth. This finding may inform strategies for improving outcomes in neonatal cardiac injury.

Keywords:
NOcardiac regenerationcardiomyocyte proliferationimmune responsenitric oxidenitrite

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Area of Science:

  • Cardiovascular Biology
  • Regenerative Medicine
  • Physiology

Background:

  • Adult mammals cannot regenerate heart tissue, unlike neonates and zebrafish.
  • Nitric oxide (NO), derived from nitrite, plays a role in modulating injury responses.
  • Zebrafish serve as a key model for studying cardiac regeneration due to their innate ability.

Purpose of the Study:

  • To investigate the effects of physiological nitrite levels on cardiac and fin regeneration in zebrafish.
  • To explore the downstream cellular and molecular signaling pathways involved in nitrite-mediated regeneration.
  • To assess the impact of nitrite on immune cell recruitment and cardiomyocyte proliferation post-injury.

Main Methods:

  • Zebrafish subjected to ventricular amputation or cryoinjury.
  • Treatment with nitrite in hypoxic water.
  • Analysis of cardiomyocyte proliferation, angiogenesis, and immune cell infiltration (thrombocytes, macrophages, neutrophils).
  • Evaluation in a fin regeneration model to confirm NO-dependent neutrophil recruitment.

Main Results:

  • Nitrite administration accelerated zebrafish heart regeneration following injury.
  • Increased cardiomyocyte proliferation and enhanced angiogenesis were observed.
  • Nitrite promoted the recruitment of thrombocytes, macrophages, and neutrophils to the injury site.
  • Neutrophil recruitment in fin regeneration was dependent on nitric oxide.

Conclusions:

  • Physiological nitrite levels enhance zebrafish cardiac regeneration through increased cell proliferation and angiogenesis.
  • Nitrite modulates immune cell recruitment to the site of cardiac injury.
  • Findings suggest potential therapeutic applications for nitrite in neonatal cardiac injury models.