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Infect. Immun., Oct 1997, 4281-4287, Vol 65, No. 10
JE Hughes, J Stewart, GR Barclay and JR Govan
Neutrophil activation may play an important role in the pathogenesis of
respiratory disease in Burkholderia cepacia-colonized cystic fibrosis (CF)
patients. As bacterial lipopolysaccharides (LPS) are potent
immunostimulatory molecules, we investigated the role of B. cepacia LPS in
neutrophil activation processes. LPS extracted from a highly transmissible
and virulent strain of B. cepacia (J2315) was found to increase neutrophil
surface expression of the beta2 integrin, complement receptor 3, and to
prime neutrophil respiratory burst responses to the neutrophil-activating
agent fMet-Leu-Phe. By contrast, LPS extracted from a nonmucoid Pseudomonas
aeruginosa strain isolated from a patient with CF showed little or no
priming activity. As B. cepacia is currently being developed as a
biocontrol agent for large- scale agricultural release, we compared LPS
molecules from a range of bacterial strains for their proinflammatory
ability. Priming activity was demonstrated in LPS extracts from all B.
cepacia strains tested, with one environmental strain, J2552, showing the
highest activity. These findings indicate (i) that B. cepacia LPS may
contribute to the inflammatory nature of B. cepacia infection in CF
patients, both by promoting increased neutrophil recruitment and by priming
neutrophil respiratory burst responses, and (ii) that environmental strains
of B. cepacia may have considerable inflammatory potential in susceptible
individuals.
Copyright © 1997, American Society for Microbiology
Priming of neutrophil respiratory burst activity by lipopolysaccharide from Burkholderia cepacia
Department of Medical Microbiology, University of Edinburgh, United Kingdom. Jayne.Hughes@ed.ac.uk
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