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Induction of Myocardial Infarction in Adult Zebrafish Using Cryoinjury
Published on: April 18, 2012
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Myocardial Polyploidization Creates a Barrier to Heart Regeneration in Zebrafish
Juan Manuel González-Rosa1, Michka Sharpe1, Dorothy Field2
1Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, MA 02129, USA; Harvard Medical School, Boston, MA 02115, USA.
Developmental Cell
|February 28, 2018
Summary
Heart muscle regeneration is blocked by polyploidization. In zebrafish, diploid cardiomyocytes regenerate heart muscle, while polyploid ones do not, suggesting a strategy for human heart repair.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Cell Biology
Background:
- Polyploidization of cardiomyocytes naturally occurs in mammals post-birth.
- This natural polyploidization is correlated with a reduced capacity for heart regeneration.
Purpose of the Study:
- To experimentally determine if cardiomyocyte polyploidization is sufficient to inhibit heart regeneration.
- To investigate the role of diploid versus polyploid cardiomyocytes in heart regeneration.
Main Methods:
- Induced polyploidization in zebrafish cardiomyocytes using dominant-negative Ect2 to inhibit cytokinesis.
- Generated transgenic zebrafish with mosaic hearts containing differentially labeled diploid and polyploid cardiomyocyte populations.
- Assessed the proliferative potential and contribution of diploid and polyploid cardiomyocytes to heart regeneration.
Main Results:
- Experimental polyploidization of zebrafish cardiomyocytes suppressed their proliferative potential during regeneration.
- Diploid cardiomyocytes demonstrated a competitive advantage over polyploid cardiomyocytes in regenerating heart muscle.
- Hearts with a critical proportion of polyploid cardiomyocytes failed to regenerate, highlighting the necessity of diploid cells.
Conclusions:
- Cardiomyocyte polyploidization acts as a barrier to heart regeneration.
- Mobilizing rare diploid cardiomyocytes in the human heart may enhance its regenerative capacity.
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