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Endoderm regeneration in the chick embryo studied by SEM.

M A England, J Wakely

    Anatomy and Embryology
    |July 17, 1978
    PubMed
    Summary

    Chick embryo endoderm regeneration occurs via mesoderm cell transformation. New endoderm forms from mesoderm, not original remnants, with contact inhibition observed at boundaries.

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    Area of Science:

    • Developmental biology
    • Cell biology
    • Embryology

    Background:

    • The area pellucida endoderm is crucial for early chick embryo development.
    • Understanding endoderm regeneration mechanisms is vital for developmental studies.

    Purpose of the Study:

    • To investigate the origin and process of area pellucida endoderm regeneration in chick embryos.
    • To characterize the cellular behavior during endoderm regeneration using advanced microscopy.

    Main Methods:

    • Scanning electron microscopy (SEM) was employed to visualize the regeneration process.
    • Chick embryos were utilized to study endoderm removal and subsequent regeneration.

    Main Results:

    • A new endoderm layer was formed through in situ transformations of mesoderm cells.
    • Mesoderm cells flattened, lost cellular processes, and organized into an epithelium.
    • Regenerated endoderm area matched the mesoderm area prior to removal, confirming mesodermal origin.
    • Original endoderm remnants did not contribute to the new layer.
    • Contact inhibition was observed between original and regenerated endoderm cells.

    Conclusions:

    • Chick embryo endoderm regeneration is a mesoderm-driven process.
    • Cellular plasticity and cell-cell interactions, like contact inhibition, are key to regeneration.
    • This study clarifies the cellular basis of endoderm formation during embryonic development.

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