title: Inducible cyclooxygenase released prostaglandin E2 modulates the severity of infection caused by Streptococcus pyogenes.
abstract: Streptococcus pyogenes is a significant human pathogen that can cause life-threatening invasive infections. Understanding the mechanism of disease is crucial to the development of more effective therapies. In this report, we explored the role of PGE(2), an arachidonic acid metabolite, and its rate-limiting enzyme cyclooxygenase 2 (COX-2) in the pathogenesis of severe S. pyogenes infections. We found that the COX-2 expression levels in tissue biopsies from S. pyogenes-infected patients, as well as in tissue of experimentally infected mice, strongly correlated with the severity of infection. This harmful effect was attributed to PGE(2)-mediated suppression of the bactericidial activity of macrophages through interaction with the G2-coupled E prostanoid receptor. The suppressive effect of PGE(2) was associated with enhanced intracellular cAMP production and was mimicked by the cAMP-elevating agent, forskolin. Activation of protein kinase A (PKA) was the downstream effector mechanisms of cAMP because treatment with PKI(14-22), a highly specific inhibitor of PKA, prevented the PGE(2)-mediated inhibition of S. pyogenes killing in macrophages. The inhibitory effect exerted by PKA in the generation of antimicrobial oxygen radical species seems to be the ultimate effector mechanism responsible for the PGE(2)-mediated downregulation of the macrophage bactericidal activity. Importantly, either genetic ablation of COX-2, pharmacological inhibition of COX-2 or treatment with the G2-coupled E prostanoid antagonist, AH6809, significantly improved the disease outcome in S. pyogenes infected mice. Therefore, the results of this study open up new perspectives on potential molecular pathways that are prone to pharmacological manipulation during severe streptococcal infections.
authors.affiliation: Infection Immunology Research Group, Department of Microbial Pathogenesis, Helmholtz Centre for Infection Research, Braunschweig, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Goldmann
authors.forename: Erika
authors.initials: E
authors.lastname: Hertzén
authors.forename: Alexander
authors.initials: A
authors.lastname: Hecht
authors.forename: Heike
authors.initials: H
authors.lastname: Schmidt
authors.forename: Sabine
authors.initials: S
authors.lastname: Lehne
authors.forename: Anna
authors.initials: A
authors.lastname: Norrby-Teglund
authors.forename: Eva
authors.initials: E
authors.lastname: Medina
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000235:genetics / Q000378:metabolism*; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D015232:Dinoprostone / Q000037:antagonists & inhibitors / Q000378:metabolism*; D005260:Female; D054884:Host-Pathogen Interactions; D006801:Humans; D007150:Immunohistochemistry; D008264:Macrophages / Q000166:cytology / Q000378:metabolism* / Q000382:microbiology; D051379:Mice; D008809:Mice, Inbred C3H; D018345:Mice, Knockout; D009578:Nitrobenzenes / Q000494:pharmacology; D011448:Prostaglandin Antagonists / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012720:Severity of Illness Index; D013290:Streptococcal Infections / Q000235:genetics / Q000378:metabolism* / Q000382:microbiology; D013297:Streptococcus pyogenes / Q000502:physiology; D013449:Sulfonamides / Q000494:pharmacology; D044004:Xanthones / Q000494:pharmacology
chemical_list: D016861:Cyclooxygenase Inhibitors; D009578:Nitrobenzenes; D011448:Prostaglandin Antagonists; D017382:Reactive Oxygen Species; D013449:Sulfonamides; D044004:Xanthones; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; C053876:6-isopropoxy-9-oxoxanthene-2-carboxylic acid; D000242:Cyclic AMP; D051546:Cyclooxygenase 2; D017868:Cyclic AMP-Dependent Protein Kinases; D015232:Dinoprostone