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Figure 2 | BMC Microbiology

Figure 2

From: Klebsiella pneumoniae triggers a cytotoxic effect on airway epithelial cells

Figure 2

Capsule polysaccharide (CPS) is required for cytotoxicity during K. pneumoniae infection of A549 lung epithelium. A. Infection of A549 lung epithelial cells with K. pneumoniae 52K10, a bacterial strain lacking CPS. MOIs used were 200:1 (upper), 500:1 (middle) and 1000:1 (lower panel and right detail). Infections were carried out for 5 h in all cases. Infection conditions of MOI 500:1 for 4 h were used in the bottom panel. Infected cells were fixed and stained for immunofluorescence. Actin cytoskeleton was labelled with phalloidin-RRX (red). White arrows and detail show cell spread morphology and absence of cytotoxicity. B. Adhesion levels of K. pneumoniae strains 52145 and 52K10 to A549 lung epithelial cells. Infections were carried out at MOI 100:1 for 2 h. Mean values from three independent experiments are shown (error bars = SD).

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