Gata4-Dependent Differentiation of c-Kit+-Derived Endothelial Cells Underlies Artefactual Cardiomyocyte Regeneration in the Heart
View abstract on PubMed
Summary
This summary is machine-generated.Recent studies suggest new cardiomyocyte formation from c-Kit+ progenitor cells is rare. This study found that apparent cardiomyocyte generation from c-Kit+ cells was an artifact of leukocyte fusion, not true de novo formation.
Area Of Science
- Cardiovascular Biology
- Stem Cell Biology
- Developmental Biology
Background
- c-Kit+ adult progenitor cells were previously thought to generate new cardiomyocytes.
- Recent genetic evidence indicates that de novo cardiomyocyte formation from these cells is exceedingly rare.
- This study investigated whether rare events represent true cardiomyocyte formation.
Purpose Of The Study
- To determine if rare de novo cardiomyocyte formation occurs from c-Kit+ progenitor cells.
- To investigate the role of Gata4 and Gata6 in cardiomyocyte development from c-Kit+ cells.
- To clarify the contribution of different cell types to apparent cardiomyocyte formation.
Main Methods
- Utilized Kit allele-dependent lineage tracing and fusion analysis in mice.
- Performed cell type-specific deletion of Gata4 and Gata6 in c-Kit+ progenitor cells.
- Employed bone marrow transplantation and Tie2CreERT2 transgene for cell fate analysis and endothelial cell impact assessment.
Main Results
- Deletion of Gata4 in endothelial cells led to endothelial cell expansion and defective differentiation.
- This resulted in increased leukocyte infiltration and a false increase in lineage-traced cardiomyocytes.
- The observed increase in labeled cardiomyocytes was an artifact of leukocyte-cardiomyocyte fusion.
Conclusions
- Apparent de novo cardiomyocyte formation from c-Kit+ cells is an artifact of leukocyte fusion.
- Deletion of Gata4 in endothelial progenitor cells impairs angiogenesis and capillary integrity.
- This research clarifies the origin of newly formed cardiomyocytes and the role of Gata4 in endothelial function.