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Zoekopdracht: faculteit: "ACTA" en publicatiejaar: "2009"

AuteursC. Wikraiphat, J. Charoensap, P. Utaisincharoen, S. Wongratanacheewin, S. Taweechaisupapong, D.E. Woods, J.G.M. Bolscher, S. Sirisinha
TitelComparative in vivo and in vitro analyses of putative virulence factors of Burkholderia pseudomallei using lipopolysaccharide, capsule and flagellin mutants
TijdschriftFems Immunology and Medical Microbiology
Jaargang56
Jaar2009
Nummer3
Pagina's253-259
ISSN09288244
FaculteitACTA
AMC-UvA
SamenvattingBurkholderia pseudomallei is a gram-negative bacillus that is the causative agent of melioidosis. We evaluated host–pathogen interaction at different levels using three separate B. pseudomallei mutants generated by insertional inactivation. One of these mutants is defective in the production of the polysaccharide side chains associated with lipopolysaccharide; one does not produce the capsular polysaccharide with the structure -3)-2-O-acetyl-6-deoxy-β-d-manno-heptopyranose-(1-; and the third mutant does not produce flagellin. We compared the in vivo virulence in BALB/c mice, the in vitro fate of intracellular survival inside human polymorphonuclear cells (PMNs) and macrophages (Mφs) and the susceptibility to killing by 30% normal human serum, reactive nitrogen and oxygen intermediates and antimicrobial peptides with that of their wild-type counterpart. The lipopolysaccharide and capsule mutants demonstrated a marked reduction in virulence for BALB/c mice, but the flagellin mutant was only slightly less virulent than the parent strain. The results from the BALB/c mice experiments correlated with survival in Mφs. The lipopolysaccharide and capsule mutants were also more susceptible to killing by antimicrobial agents. All bacteria were equally susceptible to killing by PMNs. Altogether, the data suggest that lipopolysaccharide and capsule and, to a much lesser extent, flagella, are most likely associated with the virulence of this bacterium and highlight the importance of intracellular killing by PMNs and Mφs in disease pathogenesis.
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