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• W2049673918 abstract "Abstract Hyperimmune sera were produced in rabbits against the spores of D. mucoroides. The heated antisera agglutinated spores as well as vegetative and interphase amebas, with no significant differences in titers. Precipitin ring tests of the antisera with extracts of cells at various stages of development indicated a marked increase in reactivity at the migrating pseudoplasmodium stage and a further increase at the spore stage. Two kinds of absorption studies were conducted and the results indicated that (1) antigenic substance(s) which are different from the surface antigens are present inside spores, and that they begin to increase in amount at the migrating pseudo-plasmodium stage; (2) new combining groups are synthesized during the process of aggregation. In order to study localization of antigens and combining groups at various stages of development, immunohistochemical studies were made by using fluorescein-conjugated antispore sera, both absorbed and unabsorbed. The staining of the cell surfaces indicated that there is a change in the surface in the interphase, this taking place some time after the amebas have finished feeding. Thereafter the cell surface remains unchanged until the time of spore formation. This latter change is characteristic only of the spores and does not occur in the stalk cells. Antibody-stained cytoplasmic granules were observed at all stages except the vegetative stage. During interphase, cells begin to synthesize new combining group(s) in or on certain granules in the cytoplasm. However, since the extent of the synthesis varies considerably from one cell to another, the cell population becomes considerably heterogeneous with respect to the amount of the combining groups they contain. After these various cells are collected randomly by the process of aggregation, the cell variation already present is further accentuated by the synthesis of new combining groups in some of the cells in the aggregation center. The cell variation in the aggregation center seems to provide a basis for the sorting out of cells in the formation of the migrating pseudoplasmodium. After the cells are rearranged, differentiation takes place according to their location within the migrating pseudoplasmodium. Cells in the anterior region lose combining groups, while they increase in the cells of the posterior region. The significance of the cell sorting in the normal development of the cellular slime molds was discussed and compared with the development of animal embryos." @default.
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• W2049673918 date "1963-08-01" @default.
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• W2049673918 title "Immunochemical and immunohistochemical studies on the development of the cellular slime mold Dictyostelium mucoroides" @default.
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• W2049673918 doi "https://doi.org/10.1016/0012-1606(63)90023-x" @default.
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