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The early embryonic heart regenerates by compensation of proliferating residual cardiomyocytes after cryoinjury
- Source :
- Cell and Tissue Research. 384(3):757-769
- Publication Year :
- 2021
- Publisher :
- Springer, 2021.
-
Abstract
- The adult mammalian heart is non-regenerative because cardiomyocytes withdraw from the cell cycle shortly after birth. Embryonic mammalian hearts, in which cardiomyocytes are genetically ablated in a salt-and-pepper-like pattern, regenerate due to compensation by residual cardiomyocytes. To date, it remains unknown whether or how transmural ventricular defects at the looped heart stage regenerate after cryoinjury. We established a cryoablation model in stage 16 chick embryonic hearts. In hearts at 5 h post cryoinjury (hpc), cryoinjury-induced defects were approximately 200 µm in width in the primitive ventricle; thereafter, the defect was filled with mesenchymal cells accumulating between the epicardium and endocardium. The defect began to regress at 4 days post cryoinjury (dpc) and disappeared around 9 dpc. Immunohistochemistry showed that there were no isl1-positive cells in either the scar tissue or residual cardiomyocytes. BrdU incorporation into residual cardiomyocytes was transiently downregulated in association with upregulation of p27 (Kip1), suggesting that cell cycle arrest occurred at G1-to-S transition immediately after cryoinjury. Estimated cell cycle length was examined, and the results showed that the shortest cell cycle length was 18 h at stages 19-23; it increased with development due to elongation of the G2-M-G1 phase and 30 h at stages 27-29. The S phase length was constant at 6-8 h. The cell cycle length was elongated immediately after cryoinjury, and it reversed at 1-2 dpc. Cryoablated transmural defects in the early embryonic heart were restored by compensation by residual myocytes.
- Subjects :
- 0301 basic medicine
p27 (Kip1)
Histology
Cell cycle checkpoint
Chick Embryo
Pathology and Forensic Medicine
03 medical and health sciences
0302 clinical medicine
Downregulation and upregulation
Animals
Regeneration
Myocyte
Myocytes, Cardiac
Endocardium
Cell Proliferation
Embryonic heart
Chemistry
Cell cycle length
Myocardium
Cell Cycle
Mesenchymal stem cell
Cell Biology
Cell cycle
Embryonic stem cell
Cell biology
030104 developmental biology
Early embryo
Cryoinjury
030217 neurology & neurosurgery
Heart regeneration
Subjects
Details
- Language :
- English
- ISSN :
- 14320878
- Volume :
- 384
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Cell and Tissue Research
- Accession number :
- edsair.doi.dedup.....df52c8707c33293dd2ed486e5361fe95