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Improved Generation of Induced Cardiomyocytes Using a Polycistronic Construct Expressing Optimal Ratio of Gata4, Mef2c and Tbx5
Published on: November 13, 2015
The transcription factor GATA4 promotes myocardial regeneration in neonatal mice
Mona Malek Mohammadi1, Badder Kattih1, Andrea Grund1
1Klinik für Kardiologie und Angiologie, Medizinische Hochschule Hannover, Hannover, Germany.
Insights
The transcription factor GATA4 is crucial for heart regeneration in neonatal mice. Restoring GATA4 levels improves cardiac repair, while its absence impairs regeneration by downregulating key pro-regenerative genes like interleukin-13.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Regenerative Medicine
Background:
- Heart failure often results from limited cardiac regeneration.
- Neonatal mice exhibit myocardial regenerative capacity until postnatal day 7.
- Transcriptional mechanisms governing neonatal heart regeneration are not fully understood.
Purpose of the Study:
- To investigate the role of the transcription factor GATA4 in neonatal mouse heart regeneration.
- To elucidate the molecular mechanisms by which GATA4 influences cardiac repair.
Main Methods:
- Analysis of GATA4 expression in neonatal mouse hearts at different developmental stages.
- Adenoviral gene transfer to restore GATA4 levels in P7 mice.
- Generation and analysis of cardiomyocyte-specific Gata4 knockout (CM-G4-KO) mice.
- Cryoinjury model to assess cardiac regeneration.
- Assessment of cardiomyocyte proliferation and myocardial angiogenesis.
- Analysis of gene expression, including pro-regenerative genes like interleukin-13 (Il13).
Main Results:
- Cardiac GATA4 abundance decreases significantly from postnatal day 1 to 7, coinciding with loss of regenerative capacity.
- Adenoviral GATA4 delivery enhanced cardiac regeneration in P7 mice post-cryoinjury.
- CM-G4-KO mice exhibited impaired regeneration, larger scars, reduced cardiomyocyte proliferation, and decreased angiogenesis after cryoinjury at P0.
- Reduced GATA4 expression diminished cardiomyocyte proliferation in explants and isolated cells.
- Decreased GATA4 led to downregulation of pro-regenerative genes, including Il13.
- Systemic IL-13 administration rescued defective heart regeneration in CM-G4-KO mice.
Conclusions:
- GATA4 is a critical regulator of neonatal mouse heart regeneration.
- GATA4 promotes cardiomyocyte proliferation and myocardial angiogenesis, essential for cardiac repair.
- The GATA4-IL13 axis represents a potential therapeutic target for enhancing heart regeneration.
Abstract:
Heart failure is often the consequence of insufficient cardiac regeneration. Neonatal mice retain a certain capability of myocardial regeneration until postnatal day (P)7, although the underlying transcriptional mechanisms remain largely unknown. We demonstrate here that cardiac abundance of the transcription factor GATA4 was high at P1, but became strongly reduced at P7 in parallel with loss of regenerative capacity. Reconstitution of cardiac GATA4 levels by adenoviral gene transfer markedly improved cardiac regeneration after cryoinjury at P7. In contrast, the myocardial scar was larger in cardiomyocyte-specific Gata4 knockout (CM-G4-KO) mice after cryoinjury at P0, indicative of impaired regeneration, which was accompanied by reduced cardiomyocyte proliferation and reduced myocardial angiogenesis in CM-G4-KO mice. Cardiomyocyte proliferation was also diminished in cardiac explants from CM-G4-KO mice and in isolated cardiomyocytes with reduced GATA4 expression. Mechanistically, decreased GATA4 levels caused the downregulation of several pro-regenerative genes (among them interleukin-13, Il13) in the myocardium. Interestingly, systemic administration of IL-13 rescued defective heart regeneration in CM-G4-KO mice and could be evaluated as therapeutic strategy in the future.
