Abstract:
:Single cells from the siliceous sponge Geodia cydonium, obtained after chemical dissociation, reaggregate in the presence of the aggregation factor in Ca2+-containing medium to large aggregates. It was found that polyvalent organic cations (polylysine, spermine, spermidine, putrescine) enhance the Ca2+-mediated cell aggregation. In Ca2+-free medium these compounds also cause reaggregation; aggregates of a diameter up to 800 micron are formed within 120 min. Proteins, containing basic groups of amino acid residues have no influence on cell aggregation. Monovalent cations inhibit the reaggregation process. The enhancing effect of polyvalent organic cations on cell aggregation is dependent on the presence of the soluble aggregation factor. From the findings that polycations do not alter the duration of the lag phase (a characteristic of the aggregation factor-mediated Geodia cell reaggregation) and act in cooperation with the aggregation receptor, we assume that the polycations bind between the aggregation factor and the aggregation receptor.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Müller WE,Zahn RK,Kurelec B,Müller Idoi
10.1016/0014-4827(78)90382-8subject
Has Abstractpub_date
1978-05-01 00:00:00pages
409-14issue
2eissn
0014-4827issn
1090-2422journal_volume
113pub_type
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