Involvement of a cell-surface glycoprotein in the cell-sorting process of Dictyostelium discoideum.
Cell sorting among prespore cells and prestalk cells in Dictyostelium discoideum was studied by using fluorochrome-labeled cells in an in vitro assay. Labeled prestalk cells first formed randomly mixed aggregates with unlabeled prespore cells. Then cells began to sort out from each other. About 3-4 hr later, prestalk cells became clustered at one pole of the aggregate. Aggregates deposited on an agar surface underwent morphogenesis and formed migrating slugs within 3 hr. The addition of Fab fragments directed against a cell-surface glycoprotein of Mr 150,000 (gp 150) to the cell mixture completely inhibited the cell-sorting phenomenon. Morphogenesis of such aggregates on agar was also delayed by 5 hr. However, inclusion of Fab fragments directed against the endogenous lectins, the contact site A glycoprotein, or vegetative cells had no detectable effect on cell sorting or morphogenesis of these reconstituted aggregates.
D002448:Cell Adhesion; D004023:Dictyostelium / Q000166:cytology*; D005656:Fungal Proteins / Q000502:physiology*; D006023:Glycoproteins / Q000276:immunology / Q000502:physiology*; D007140:Immunoglobulin Fab Fragments; D008565:Membrane Proteins / Q000502:physiology*; D008970:Molecular Weight; D009024:Morphogenesis
D005656:Fungal Proteins; D006023:Glycoproteins; D007140:Immunoglobulin Fab Fragments; D008565:Membrane Proteins