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Effect of fluticasone propionate and salmeterol on Pseudomonas aeruginosa infection of the respiratory mucosa in vitro

RB Dowling, M Johnson, PJ Cole, R Wilson
European Respiratory Journal 1999 14: 363-369; DOI:
RB Dowling
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M Johnson
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PJ Cole
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R Wilson
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Abstract

The purpose of this study was to investigate the effect of the corticosteroid, fluticasone propionate (FP), on Pseudomonas aeruginosa infection of the respiratory mucosa of an organ culture model in vitro. Organ cultures infected with P. aeruginosa had significantly (p< or =0.05) elevated levels of mucosal damage and significantly (p< or =0.05) less ciliated cells compared to controls. Preincubation of tissue with FP (10(-6) or 10(-5) but not 10(-7) M) prior to P. aeruginosa infection significantly (p< or =0.05) reduced the bacterially induced mucosal damage in a concentration-dependent manner. FP (10(-5) M) also significantly (p< or =0.05) prevented loss of ciliated cells. FP did not alter the density of bacteria adherent to the different mucosal features of the organ cultures, but did reduce total bacterial numbers due to the reduced amount of damaged tissue, which is a preferred site of P. aeruginosa adherence. It has previously been shown that the long-acting beta2-agonist salmeterol (4 x 10(-7)M) also reduces the mucosal damage caused by P. aeruginosa infection, probably via elevation of intracellular cyclic adenosine monophosphate concentrations. Preincubation of tissue with both 10(-7)M FP and 10(-7)M salmeterol, concentrations at which they did not by themselves influence the effect of P. aeruginosa infection, significantly (p< or =0.05) reduced P. aeruginosa-induced loss of cilia. However, there was no additional benefit from adding 4 x 10(-7)M salmeterol to 10(-6)M FP. In conclusion fluticasone propionate reduced mucosal damage caused by P. aeruginosa infection in vitro and preserved ciliated cells. There was a synergistic action with salmeterol in the preservation of ciliated cells.

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Effect of fluticasone propionate and salmeterol on Pseudomonas aeruginosa infection of the respiratory mucosa in vitro
RB Dowling, M Johnson, PJ Cole, R Wilson
European Respiratory Journal Aug 1999, 14 (2) 363-369;

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Effect of fluticasone propionate and salmeterol on Pseudomonas aeruginosa infection of the respiratory mucosa in vitro
RB Dowling, M Johnson, PJ Cole, R Wilson
European Respiratory Journal Aug 1999, 14 (2) 363-369;
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