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The Journal of Immunology, 2005, 174: 595-599.
Copyright © 2005 by The American Association of Immunologists


CUTTING EDGE

Cutting Edge: Macrophage Inhibition by Cyclic AMP (cAMP): Differential Roles of Protein Kinase A and Exchange Protein Directly Activated by cAMP-11

David M. Aronoff2,*,{dagger}, Claudio Canetti2,{dagger}, Carlos H. Serezani{dagger},{ddagger}, Ming Luo{dagger} and Marc Peters-Golden3,{dagger}

Divisions of * Infectious Diseases and {dagger} Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI 48109; and {ddagger} Department of Immunology, Instituto de Ciências Biomédicas-IV, University of São Paulo, São Paulo, Brazil

cAMP has largely inhibitory effects on components of macrophage activation, yet downstream mechanisms involved in these effects remain incompletely defined. Elevation of cAMP in alveolar macrophages (AMs) suppresses Fc{gamma}R-mediated phagocytosis. We now report that protein kinase A (PKA) inhibitors (H-89, KT-5720, and myristoylated PKA inhibitory peptide 14–22) failed to prevent this suppression in rat AMs. We identified the expression of the alternative cAMP target, exchange protein directly activated by cAMP-1 (Epac-1), in human and rat AMs. Using cAMP analogs that are highly specific for PKA (N6-benzoyladenosine-3',5'-cAMP) or Epac-1 (8-(4-chlorophenylthio)-2'-O-methyladenosine-3',5'-cAMP), we found that activation of Epac-1, but not PKA, dose-dependently suppressed phagocytosis. By contrast, activation of PKA, but not Epac-1, suppressed AM production of leukotriene B4 and TNF-{alpha}, whereas stimulation of either PKA or Epac-1 inhibited AM bactericidal activity and H2O2 production. These experiments now identify Epac-1 in primary macrophages, and define differential roles of Epac-1 vs PKA in the inhibitory effects of cAMP.




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