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Cell interactions and endoderm differentiation in cultured mouse embryos
Journal of Embryology and Experimental Morphology
|April 1, 1981
Summary
Mouse embryo endoderm differentiation into parietal endoderm is influenced by cell interactions. Visceral extraembryonic endoderm changes phenotype when cultured with specific cells, suggesting environmental cues guide cell fate.
Area of Science:
- Developmental biology
- Cell biology
- Embryology
Background:
- The early mouse embryo exhibits distinct extraembryonic endoderm layers.
- Understanding endoderm differentiation is crucial for developmental processes.
Purpose of the Study:
- To investigate factors influencing visceral extraembryonic endoderm differentiation.
- To determine if cell-cell or cell-substrate interactions guide endoderm phenotype.
Main Methods:
- Culture of dissected 6.5-day mouse embryo egg cylinders in vitro.
- Separation and culture of embryonic and extraembryonic halves.
- Recolonization experiments with visceral endoderm on extraembryonic ectoderm.
Main Results:
- Extraembryonic endoderm differentiates into parietal endoderm when cultured with extraembryonic ectoderm.
- Parietal endoderm phenotype is characterized by basement membrane deposition and specific matrix protein synthesis (laminin, Type IV procollagen).
- Visceral endoderm cultured in isolation or on embryonic fragments does not adopt a parietal endoderm phenotype.
Conclusions:
- Cell-cell and cell-substrate interactions significantly influence extraembryonic endoderm differentiation.
- Endoderm differentiation into visceral and parietal types is not solely determined by cell lineage.
- Local environmental cues play a critical role in directing endoderm cell fate during mouse embryogenesis.