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Clindamycin, Erythromycin, and Roxithromycin Inhibit the Proinflammatory Interactions of Pseudomonas Aeruginosa Pigments with Human Neutrophils in Vitro

Overview
Specialty Pharmacology
Date 1992 Jun 1
PMID 1329616
Citations 5
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Abstract

The Pseudomonas aeruginosa-derived phenazine pigments pyocyanin and 1-hydroxyphenazine (1-hp) prime human neutrophils for enhanced, stimulus-activated release of superoxide and myeloperoxidase (MPO), respectively. In the present study, the modulatory potentials of the antimicrobial agents clindamycin, erythromycin, and roxithromycin (10 and 20 micrograms/ml) on the prooxidative interactions of pyocyanin and 1-hp (12.5 microM) with human neutrophils have been investigated. Clindamycin, erythromycin, and especially roxithromycin caused dose-related inhibition of the generation of superoxide by both untreated and pyocyanin-treated neutrophils during activation with either the synthetic chemotactic tripeptide N-formyl-L-methionyl-L-leucyl-L-phenylalanine (FMLP) or the calcium ionophore A23187. The antimicrobial agents also inhibited the generation of reactive oxidants by the MPO-H2O2-halide system during activation of both untreated and 1-hp-treated neutrophils by FMLP. These effects appeared to be due to drug-related interference with membrane-associated oxidative metabolism, since none of the antimicrobial agents inhibited the release of MPO by activated neutrophils, nor did they possess oxidant-scavenging properties. These data demonstrate that clindamycin, erythromycin, and especially roxithromycin antagonize the proinflammatory interactions of pyocyanin and 1-hp with neutrophils and indicate a possible therapeutic role for these antimicrobial agents in the prevention of tissue damage in diseases characterized by P. aeruginosa infection.

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