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Related Experiment Videos

Extracellular coat in developing human palatal processes: electron microscopy and ruthenium red binding

S M Meller, L H Barton

    The Anatomical Record
    |February 1, 1978
    PubMed
    Summary

    Specialized surface coats and cell death in human palatal processes may aid epithelial adherence during development. This research explores the molecular and cellular mechanisms facilitating tissue fusion.

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    Area of Science:

    • Developmental Biology
    • Cell Biology
    • Histology

    Background:

    • Epithelial adherence is crucial for tissue fusion during embryonic development.
    • The human palate forms through the fusion of palatal processes, requiring specialized cell interactions.
    • Understanding the molecular and cellular mechanisms of palatal fusion is essential for addressing congenital defects.

    Purpose of the Study:

    • To investigate specialized features of the human palatal process epithelium that may promote adherence.
    • To identify the molecular and cellular components involved in the interaction between opposing palatal processes.

    Main Methods:

    • Histological examination of human palatal processes.
    • Ruthenium red (RR) staining to visualize surface coats and extracellular matrix components.

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  • Microscopic analysis of epithelial cell morphology and intercellular spaces.

    • Main Results:

    • A ruthenium red (RR)-stained surface coat was observed on the apical aspect of the palatal epithelium.
    • RR staining was also present in intercellular spaces and necrotic cells in prefusion regions.
    • A dense material, distinct from the RR-stained coat, was found in superficial intercellular spaces.
    • Many superficial epithelial cells in the prefusion region showed signs of necrosis.

    Conclusions:

    • The combination of degenerating surface cells and accumulated poly-anionic substances (e.g., glycoproteins) likely facilitates epithelial adherence.
    • These findings suggest a specialized mechanism for mediating the fusion of human palatal processes.
    • This study provides insights into the cellular and molecular basis of palate development.