par Van De Vyver, Gisèle 
Référence Current Topics in Developmental Biology, 10, C, page (123-140)
Publication Publié, 1975-01
Référence Current Topics in Developmental Biology, 10, C, page (123-140)
Publication Publié, 1975-01
Article révisé par les pairs
| Résumé : | This chapter discusses the phenomena of sponge cell recognition. When fully grown sponges belonging to the same species are brought into contact, either naturally or by an experimental process, they fuse into a single organism. In the absence of any circulatory system, the ability for cellular recognition resides in the cell surface and is expressed when cells come into contact. This characteristic of sponges and the readiness, with which the sponges can be dissociated into cellular suspension, led to the main experimental work on cellular recognition in these organisms— that is, the studies on the aggregating behavior of dissociated sponge cells. The technique of cell aggregation is very useful, as it allows the mixing of cell suspensions of different kinds and proportions, and because a large number of cells can be brought simultaneously into contact. Purification and characterization of sponge cell aggregating factors was first attempted in Microciona prolifera and Haliclona occulata. Glycopeptides extracted from whole sponges with trichloroacetic acid were antigenic and that they elicited in rabbits precipitating and agglutinating antisera specific for the homologous cells. Some phenomena, involved in sponge cell recognition, were investigated during the reaggregation of the dissociated cells. It is pointed out that in sponges cell, recognition occurs at three levels—namely, cell type specificity, intraspecific recognition, and interspecific recognition. © 1975, Academic Press Inc. |
