title: Properties of protein kinase and adenylate cyclase-deficient variants of a macrophage-like cell line.
abstract: Stable variants of the macrophage-like cell line J774.2, defective in adenylate cyclase and protein kinase activities, were selected by cloning cells resistant to the growth-inhibitory effect of cholera toxin and 8-bromo-adenosine 3':5' cyclic monophosphoric acid (8 Br-cAMP), respectively. These variants were analyzed for their ability to respond to cyclic AMP-mediated enhancement of phagocytosis and cyclic AMP-mediated inhibition of plasminogen activator secretion and growtn. The adenylate cyclase variants were unaffected by cholera toxin but were sensitive to 8 Br-cAMP-mediated inhibition of plasminogen activator secretion and growth. One of these variants exhibited a defect in phagocytosis that could be corrected by 8 Br-cAMP. The protein kinase variants exhibited normal basal phagocytosis that could not be stimulated by either 8 Br-cAMP or cholera toxin; they were also insensitive to cyclic AMP-mediated inhibition of plasminogen activator secretion and growth. The studies demonstrate that the three effects of cyclic AMP in J774.2--inhibition of growth and plasminogen activator secretion, and enhancement of basal Fc-mediated phagocytosis--are mediated by a cyclic AMP-dependent portein kinase. The results support the usefulness of variants in cyclic nucleotide metabolism in understanding the regulation of differentiated cell function by cyclic AMP.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism*; D002460:Cell Line; D002772:Cholera Toxin / Q000494:pharmacology; D000242:Cyclic AMP / Q000031:analogs & derivatives / Q000494:pharmacology; D008264:Macrophages / Q000187:drug effects / Q000201:enzymology* / Q000502:physiology; D009154:Mutation; D010587:Phagocytosis / Q000187:drug effects; D010960:Plasminogen Activators / Q000378:metabolism; D011494:Protein Kinases / Q000378:metabolism*
chemical_list: D002772:Cholera Toxin; D000242:Cyclic AMP; D011494:Protein Kinases; D010960:Plasminogen Activators; D000262:Adenylyl Cyclases