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• W999215 abstract "Vegetative cells belonging to species of Polysphondylium produce a small but distinctly positive reaction to cAMP in Bonner's cellophane square test at concentrations as low as 10−7 M, comparable to the reaction of vegetative cells of Dictyostelium discoideum. Aggregative cells of Polysphondylium do not exhibit increased rates of chemotactic movement nor higher sensitivity towards cAMP as is characteristic for Dictyostelium species. Exposed to 10−M of cAMP myxamoebae of P. pallidum differentiate into stalk cells, starting after 13–15 h when kept in the light and after 28 h in the dark. Stalk cells were only observed within cell groups and at later stages occurred predominantly in clusters which were often surrounded by sheath-like material. In addition, 10−3M cAMP leads to aberrant aggregation patterns, to a reduction in territory size and to a general arrest of morphogenesis beyond aggregation. At high cell densities (>5000 cells/mm2) 10−3M cAMP induced formation of roundish cell masses superficially resembling macrocysts but lacking the characteristic giant cells and endocytes. Applied to migrating pseudoplasmodia of P. pallidum and D. giganteum cAMP drastically curtails migration, culmination and spore differentiation. Apical dominance within the pseudoplasmodia is abolished. The apical papillae broaden within an hour and this is followed by the formation of protuberances along the entire pseudoplasmodia. Cells in the papilla are transformed into stalk cells within 2 h while it takes from 4–6 h until the same process starts within the main body of the pseudoplasmodium and the protuberances. At the ultrastructural level P. pallidum is characterized by the presence of numerous prespore specific vacuoles (PV) in all the cells of the pseudoplasmodium back of the apex. Prespore cells are continuously transformed into prestalk cells in the transition zone located in the papillar neck region. Externally applied cAMP induces ultrastructural alterations in the main body of the pseudoplasmodium identical to those observed under normal conditions in the main papilla and during whorl formation." @default.
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• W999215 date "1977-01-01" @default.
• W999215 modified "2023-10-18" @default.
• W999215 title "INFLUENCE OF cAMP ON CELL DIFFERENTIATION AND MORPHOGENESIS IN POLYSPHONDYLIUM" @default.
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• W999215 doi "https://doi.org/10.1016/b978-0-444-41608-7.50020-4" @default.
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