title: Differences of adenylate cyclase localization in guinea-pig peritoneal macrophages under different physiological conditions: an ultracytochemical study.
abstract: The ultrastructural localization of adenylate cyclase activity has been investigated in unfixed guinea-pig peritoneal macrophages in different physiological states (such as suspension, adhesion and phagocytosis) using a medium containing 5'-adenylyl-imidodiphosphate (AMP-PNP) as the substrate. Adenylate cyclase activity was observed in cytoplasmic vacuoles of macrophages in suspension; in the perinuclear space, endoplasmic reticulum, Golgi complex and pseudopods of adherent macrophages; and surrounding phagocytosed polystyrene particles. The activity was inhibited by Alloxan added to the incubation medium and no staining was observed when AMP-PNP was omitted from the medium. The segregation of this enzyme to phagocytic vacuoles and pseudopods may have significant implications in understanding cyclic nucleotide function in adhesion and phagocytosis.
mesh_terms: D000262:Adenylyl Cyclases / Q000032:analysis*; D000496:Alloxan / Q000494:pharmacology; D000818:Animals; D002448:Cell Adhesion; D006168:Guinea Pigs; D006651:Histocytochemistry; D008264:Macrophages / Q000201:enzymology* / Q000648:ultrastructure
chemical_list: D000496:Alloxan; D000262:Adenylyl Cyclases