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A possible model for cell-cell recognition via surface macromolecules.

M M Burger, R S Turner, W J Kuhns

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |July 17, 1975
    PubMed
    Summary
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    Cell recognition during embryogenesis is crucial for proper cell distribution. Sponge cell aggregation offers a model for understanding cell-cell interactions, mediated by specific surface molecules like aggregation factors and baseplates.

    Area of Science:

    • Developmental Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Proper cell distribution during embryogenesis is essential for organism development.
    • Cell-cell recognition, mediated by surface components, plays a key role in this process.
    • Understanding these mechanisms is vital for developmental biology and regenerative medicine.

    Purpose of the Study:

    • To summarize alternative mechanisms for establishing cell distribution during embryogenesis.
    • To analyze species-specific recognition in sponge cell aggregation as a model for higher animals.
    • To investigate the molecular basis of cell-cell recognition.

    Main Methods:

    • Review of known cell-cell recognition mechanisms.
    • Analysis of sponge cell sorting-out and reaggregation processes.

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  • Development of a cell-free system to mimic sponge cell aggregation.

    • Main Results:

    • Three primary mechanisms for cell distribution: chemotaxis, extracellular matrix/cell guidance, and random movement with recognition.
    • Two distinct recognition mechanisms: macromolecule interactions (e.g., enzyme-substrate) and cytoplasmic exchange (via vesicles or gap junctions).
    • Sponge cell aggregation mediated by a proteoglycan-like "aggregation factor" and a monovalent "baseplate" molecule.

    Conclusions:

    • Sponge cell aggregation serves as a valuable model for studying cell-cell recognition.
    • The "aggregation factor" and "baseplate" interaction highlights a specific molecular recognition mechanism.
    • Macromolecule-coded surface information for cell recognition in higher animals remains an open challenge.