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Early cardiogenesis in the newt embryo
R Hirakow1, S Komazaki, T Hiruma
1Department of Anatomy, Saitama Medical School, Japan.
Scanning Microscopy
|September 1, 1987
Summary
Newt embryos show cardiogenic cells migrating and forming a tubular heart. Extracellular matrix fibrils, including fibronectin, play a key role in this cell migration and heart development.
Area of Science:
- Developmental biology
- Embryology
- Cell biology
Background:
- Cardiogenesis involves complex cell migration and tissue formation.
- Understanding early heart development is crucial for regenerative medicine.
Purpose of the Study:
- To investigate the migration of cardiogenic cells and tubular heart formation in newt embryos.
- To identify the role of extracellular matrix (ECM) components in cardiogenic cell migration.
Main Methods:
- Scanning electron microscopy (SEM) for visualizing cell morphology and migration.
- Immunofluorescence and immunoSEM to detect fibronectin in the ECM.
- Stage-specific analysis from neurula to tail bud stages.
Main Results:
- Cardiogenic cells shift scaffolds from ectoderm to endoderm during migration.
- Extracellular matrix fibrils, partly composed of fibronectin, are present on the scaffold.
- Vasoformative cells appear, and the mesodermal sheet splits to form the pericardial cavity.
- The myocardial layer forms from cobblestone-like cells before epicardial coverage.
Conclusions:
- Fibronectin-containing ECM fibrils are important for cardiogenic cell migration.
- The study elucidates key cellular events in early newt heart development.
- Provides insights into the dynamic processes of embryonic heart formation.