title: Inhibition by theophylline of phagocytosis in Acanthamoeba castellanii.
abstract: Theophylline inhibited the phagocytosis of latex beads by Acanthamoeba castellanii (Neff). The cells recovered the ability to engulf beads after 1-2 hr of exposure to theophylline. Cells which have been exposed to 25 mM theophylline for a period of inhibition and recovery were not inhibited further by incubation with a fresh medium containing the same concentration of theophylline. However, the medium in which the cells recovered was as effective as a fresh medium in inhibiting phagocytosis in a fresh batch of cells, suggesting that the development of insensitivity to theophylline inhibition resides with the cells themselves. Dibutyryl cyclic AMP also inhibited bead uptake.
mesh_terms: D000656:Amoeba / Q000187:drug effects*; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology; D003470:Culture Media; D000242:Cyclic AMP / Q000494:pharmacology; D010587:Phagocytosis / Q000187:drug effects*; D013806:Theophylline / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D003470:Culture Media; D003994:Bucladesine; D013806:Theophylline; D000242:Cyclic AMP