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Am J Respir Cell Mol Biol. 2008 Aug;39(2):127-32. doi: 10.1165/rcmb.2008-0091TR. Epub 2008 Mar 6.

Cyclic AMP: master regulator of innate immune cell function.

Author information

1
Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan Health, System, Ann Arbor, Michigan, USA.

Abstract

Cyclic adenosine monophosphate (cAMP) was the original "second messenger" to be discovered. Its formation is promoted by adenylyl cyclase activation after ligation of G protein-coupled receptors by ligands including hormones, autocoids, prostaglandins, and pharmacologic agents. Increases in intracellular cAMP generally suppress innate immune functions, including inflammatory mediator generation and the phagocytosis and killing of microbes. The importance of the host cAMP axis in regulating antimicrobial defense is underscored by the fact that microbes have evolved virulence-enhancing strategies that exploit it. Many clinical situations that predispose to infection are associated with increases in cAMP, and therapeutic strategies to interrupt cAMP generation or actions have immunostimulatory potential. This article reviews the anatomy of the cAMP axis, the mechanisms by which it controls phagocyte immune function, microbial strategies to dysregulate it, and its clinical relevance.

PMID:
18323530
PMCID:
PMC2720142
DOI:
10.1165/rcmb.2008-0091TR
[Indexed for MEDLINE]
Free PMC Article

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