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2016 ; 7
(ä): 1305
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English Wikipedia
Relevant Genes Linked to Virulence Are Required for Salmonella Typhimurium to
Survive Intracellularly in the Social Amoeba Dictyostelium discoideum
#MMPMID27602025
Riquelme S
; Varas M
; Valenzuela C
; Velozo P
; Chahin N
; Aguilera P
; Sabag A
; Labra B
; Álvarez SA
; Chávez FP
; Santiviago CA
Front Microbiol
2016[]; 7
(ä): 1305
PMID27602025
show ga
The social amoeba Dictyostelium discoideum has proven to be a useful model for
studying relevant aspects of the host-pathogen interaction. In this work, D.
discoideum was used as a model to study the ability of Salmonella Typhimurium to
survive in amoebae and to evaluate the contribution of selected genes in this
process. To do this, we performed infection assays using axenic cultures of D.
discoideum co-cultured with wild-type S. Typhimurium and/or defined mutant
strains. Our results confirmed that wild-type S. Typhimurium is able to survive
intracellularly in D. discoideum. In contrast, mutants ?aroA and ?waaL are
defective in intracellular survival in this amoeba. Next, we included in our
study a group of mutants in genes directly linked to Salmonella virulence. Of
note, mutants ?invA, ?ssaD, ?clpV, and ?phoPQ also showed an impaired ability to
survive intracellularly in D. discoideum. This indicates that S. Typhimurium
requires a functional biosynthetic pathway of aromatic compounds, a
lipopolysaccharide containing a complete O-antigen, the type III secretion
systems (T3SS) encoded in SPI-1 and SPI-2, the type VI secretion system (T6SS)
encoded in SPI-6 and PhoP/PhoQ two-component system to survive in D. discoideum.
To our knowledge, this is the first report on the requirement of O-antigen and
T6SS in the survival of Salmonella within amoebae. In addition, mutants ?invA and
?ssaD were internalized in higher numbers than the wild-type strain during
competitive infections, suggesting that S. Typhimurium requires the T3SS encoded
in SPI-1 and SPI-2 to evade phagocytosis by D. discoideum. Altogether, these
results indicate that S. Typhimurium exploits a common set of genes and molecular
mechanisms to survive within amoeba and animal host cells. The use of D.
discoideum as a model for host-pathogen interactions will allow us to discover
the gene repertoire used by Salmonella to survive inside the amoeba and to study
the cellular processes that are affected during infection.