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• W2148647836 abstract "Sponges are the lowest extant metazoan phylum and for about a century they have been used as a model system to study cell adhesion. There are three classes of molecules in the extracellular matrix of vertebrates: collagens, proteoglycans, and adhesive glycoproteins, all of them have been identified in sponges. Species-specific cell recognition in sponges is mediated by supramolecular proteoglycan-like complexes termed aggregation factors, still to be identified in higher animals. Polyvalent glycosaminoglycan interactions are involved in the species-specificity, representing one of the few known examples of a regulatory role for carbohydrates. Aggregation factors mediate cell adhesion via a bifunctional activity that combines a calcium-dependent self-interaction of aggregation factor molecules plus a calcium-independent heterophilic interaction with cell surface receptors. Important cases of cell adhesion are the phenomena involved in histocompatibility reactions. A long-standing prediction has been that the evolutionary ancestors of histocompatibility systems might be found among primitive cell-cell interaction molecules. A surprising characteristic of sponges, considering their low phylogenetic position, is that they possess an exquisitely sophisticated histocompatibility system. Any grafting between two different sponge individuals (allograft) is almost invariably incompatible in the many species investigated, exhibiting a variety of transitive qualitatively and quantitatively different responses, which can only be explained by the existence of a highly polymorphic gene system. Individual variability of protein and glycan components in the aggregation factor of the red beard sponge, Microciona prolifera, matches the elevated sponge alloincompatibility, suggesting an involvement of the cell adhesion system in sponge allogeneic reactions and, therefore, an evolutionary relationship between cell adhesion and histocompatibility systems. Micros. Res. Tech. 44:204–218, 1999. © 1999 Wiley-Liss, Inc." @default.
• W2148647836 created "2016-06-24" @default.
• W2148647836 creator A5045091677 @default.
• W2148647836 creator A5075686017 @default.
• W2148647836 date "1999-02-15" @default.
• W2148647836 modified "2023-10-07" @default.
• W2148647836 title "Cell adhesion and histocompatibility in sponges" @default.
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