Investigating the Responses of Human Epithelial Cells to Predatory Bacteria

Scientific Reports
Ajay K MonnappaRobert J Mitchell

Abstract

One beguiling alternative to antibiotics for treating multi-drug resistant infections are Bdellovibrio-and-like-organisms (BALOs), predatory bacteria known to attack human pathogens. Consequently, in this study, the responses from four cell lines (three human and one mouse) were characterized during an exposure to different predatory bacteria, Bdellovibrio bacteriovorus HD100, Bacteriovorus BY1 and Bacteriovorax stolpii EB1. TNF-α levels were induced in Raw 264.7 mouse macrophage cultures with each predator, but paled in comparison to those obtained with E. coli. This was true even though the latter strain was added at an 11.1-fold lower concentration (p < 0.01). Likewise, E. coli led to a significant (54%) loss in the Raw 264.7 murine macrophage viability while the predatory strains had no impact. Tests with various epithelial cells, including NuLi-1 airway, Caco2, HT29 and T84 colorectal cells, gave similar results, with E. coli inducing IL-8 production. The viabilities of the NuLi-1 and Caco-2 cells were slightly reduced (8%) when exposed to the predators, while T84 viability remained steady. In no cases did the predatory bacteria induce actin rearrangement. These results clearly demonstrate the gentle natures of predatory b...Continue Reading

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Methods Mentioned

BETA
ELISA
IECs
genotyping
GTPases
enzyme-linked immunosorbent assay
ELISAs
Assay

Related Concepts

Antibiotics
Cell Survival
Epithelial Cells
Escherichia coli
Gene Rearrangement
Macrophage
Laboratory mice
Interleukin-8
Cell Line, Tumor
Caco-2 Cells

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