Invasion of the Brain by Listeria monocytogenes Is Mediated by InlF and Host Cell Vimentin

MBio
Pallab GhoshDarren E Higgins

Abstract

Listeria monocytogenes is a facultative intracellular bacterial pathogen that is frequently associated with food-borne infection. Of particular concern is the ability of L. monocytogenes to breach the blood-brain barrier, leading to life-threatening meningitis and encephalitis. The mechanisms used by bacterial pathogens to infect the brain are not fully understood. Here we show that L. monocytogenes is able to utilize vimentin for invasion of host cells. Vimentin is a type III intermediate filament protein within the cytosol but is also expressed on the host cell surface. We found that L. monocytogenes interaction with surface-localized vimentin promoted bacterial uptake. Furthermore, in the absence of vimentin, L. monocytogenes colonization of the brain was severely compromised in mice. The L. monocytogenes virulence factor InlF was found to bind vimentin and was necessary for optimal bacterial colonization of the brain. These studies reveal a novel receptor-ligand interaction that enhances infection of the brain by L. monocytogenes and highlights the importance of surface vimentin in host-pathogen interactions.IMPORTANCEListeria monocytogenes is an intracellular bacterial pathogen that is capable of invading numerous host cel...Continue Reading

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Methods Mentioned

BETA
immunoprecipitation
immunoprecipitation assay
transfection
confocal microscopy
fluorescence microscopy

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