title: Concanavalin A-mediated agglutination and distribution of concanavalin A-binding sites in Acanthamoeba following treatment with colchicine and cytochalasin B.
abstract: Incubation of Acanthamoeba castellanii (Neff strain) with FITC-ConA (15 micrograms/ml) resulted in the appearance of patches of fluorescence on the amoebae within 2 min of incubation. These patches disappeared following treatment of the amoebae with alpha-MeMan. Pretreatment of the amoebae with colchicine or cytochalasin B or with colchicine and cytochalasin B in combination did not significantly alter the distribution pattern of fluorescence in the amoebae. 2,4-Dinitrophenol and incubation at 4 degrees C on the other hand decreased the degree of patching of the amoebae. Pretreatment with 2,4-dinitrophenol and incubation at 4 degrees C also decreased the ConA-mediated agglutination of the amoebae. No effect on the ConA-mediated agglutination was, however, observed following pretreatment of the amoebae with colchicine and cytochalasin B neither alone nor in combination. Our results indicate that ConA-mediated agglutination and long-range ConA-receptor mobility in the Acanthamoeba are not under the control of structures sensitive to cytochalasin B or colchicine.
mesh_terms: D000371:Agglutination / Q000187:drug effects; D000656:Amoeba / Q000187:drug effects* / Q000276:immunology*; D000818:Animals; D003078:Colchicine / Q000494:pharmacology*; D003208:Concanavalin A / Q000494:pharmacology; D003571:Cytochalasin B / Q000494:pharmacology*; D003599:Cytoskeleton / Q000187:drug effects; D011952:Receptors, Concanavalin A / Q000187:drug effects* / Q000378:metabolism
chemical_list: D011952:Receptors, Concanavalin A; D003208:Concanavalin A; D003571:Cytochalasin B; D003078:Colchicine