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Related Experiment Videos

Cell adhesion and histocompatibility in sponges.

X Fernàndez-Busquets1, M M Burger

  • 1Friedrich Miescher-Institut, Basel, Switzerland. fernande@fmi.ch

Microscopy Research and Technique
|March 31, 1999
PubMed
Summary

Sponges exhibit a sophisticated histocompatibility system, suggesting evolutionary links between cell adhesion molecules and immune recognition. Their aggregation factors, crucial for species-specific cell recognition, show variability correlating with allograft incompatibility.

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Area of Science:

  • Marine Biology
  • Immunology
  • Evolutionary Biology

Background:

  • Sponges, as the earliest metazoan phylum, serve as a model for studying cell adhesion.
  • Extracellular matrix components like collagens, proteoglycans, and glycoproteins are found in sponges.
  • Species-specific cell recognition in sponges involves unique proteoglycan-like complexes called aggregation factors.

Purpose of the Study:

  • To investigate the evolutionary relationship between cell adhesion and histocompatibility systems.
  • To explore the role of sponge aggregation factors in cell adhesion and allogeneic reactions.
  • To understand the sophisticated histocompatibility system in sponges despite their primitive phylogenetic position.

Main Methods:

  • Identification of extracellular matrix molecules in sponges.

Related Experiment Videos

  • Characterization of aggregation factors and their role in cell adhesion.
  • Analysis of protein and glycan components in aggregation factors.
  • Investigation of sponge allograft compatibility and incompatibility responses.

    • Main Results:

    • Sponge aggregation factors mediate cell adhesion through calcium-dependent self-interaction and calcium-independent heterophilic interaction.
    • Sponges possess a highly sophisticated and polymorphic histocompatibility system, leading to frequent allograft incompatibility.
    • Variability in protein and glycan components of aggregation factors in *Microciona prolifera* correlates with observed alloincompatibility.

    Conclusions:

    • Sponge cell adhesion systems, particularly aggregation factors, are likely involved in allogeneic reactions.
    • The sophisticated histocompatibility system in sponges suggests an evolutionary link between cell adhesion molecules and histocompatibility.
    • Primitive cell-cell interaction molecules may represent evolutionary ancestors of histocompatibility systems.