E. coli lipopolysaccharides; Bordetella bronchiseptica; Airflow limitation; Whole body barometric plethysmography; Cough; Interaction
Abstract :
[en] This study aimed to investigate whether Escherichia coli endotoxin (LPS) may predispose the lung to an infection with Pasteurella multocida type A (Pma) and to determine the LPS concentration needed to reproduce clinical signs of bronchopneumonia. Twenty-four hours before inoculating Pma or sterile growth medium, piglets were tracheally instilled with 10, 100 or 400 microg/kg LPS. Cough, body temperature, daily weight gain (DWG) bronchoalveolar lavage fluid (BALF) cells and volume of pneumonic lung were measured. Changes in breathing pattern (Penh) were assessed by whole body barometric plethysmography. No significant changes were observed in Pma-treated or in control animals. Each LPS doses induced DWG reduction while the higher generated a severe subacute interstitial pneumonia causing hyperthermia and an increase in Penh. The combination of the lower LPS doses with Pma produced an asymptomatic bronchopneumonia leading to DWG reduction, rise in Penh and an increase in BALF macrophages and neutrophils. With 400 microg/kg LPS, Pma worsened the inflammatory process as illustrated by cough, hyperthermia, major DWG reduction and by a greater Penh response. Lung lesions consisted of severe exudative bronchopneumonia. We concluded that LPS may negatively influence growth, predispose to persisting lung inflammatory process and promote Pma infection depending on the dose previously administered.
Mainil, Jacques ; Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Bactériologie et pathologie des maladies bactériennes
Gustin, Pascal ; Université de Liège - ULiège > Département de sciences fonctionnelles > Pharmacologie, pharmacothérapie et toxicologie
Language :
English
Title :
Synergistic action of E. coli endotoxin and Pasteurella multocida type A for the induction of bronchopneumonia in pigs
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