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2016 ; 19
(4
): 443-54
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Depletion of Butyrate-Producing Clostridia from the Gut Microbiota Drives an
Aerobic Luminal Expansion of Salmonella
#MMPMID27078066
Rivera-Chávez F
; Zhang LF
; Faber F
; Lopez CA
; Byndloss MX
; Olsan EE
; Xu G
; Velazquez EM
; Lebrilla CB
; Winter SE
; Bäumler AJ
Cell Host Microbe
2016[Apr]; 19
(4
): 443-54
PMID27078066
show ga
The mammalian intestine is host to a microbial community that prevents pathogen
expansion through unknown mechanisms, while antibiotic treatment can increase
susceptibility to enteric pathogens. Here we show that streptomycin treatment
depleted commensal, butyrate-producing Clostridia from the mouse intestinal
lumen, leading to decreased butyrate levels, increased epithelial oxygenation,
and aerobic expansion of Salmonella enterica serovar Typhimurium. Epithelial
hypoxia and Salmonella restriction could be restored by tributyrin treatment.
Clostridia depletion and aerobic Salmonella expansion were also observed in the
absence of streptomycin treatment in genetically resistant mice but proceeded
with slower kinetics and required the presence of functional Salmonella type III
secretion systems. The Salmonella cytochrome bd-II oxidase synergized with
nitrate reductases to drive luminal expansion, and both were required for
fecal-oral transmission. We conclude that Salmonella virulence factors and
antibiotic treatment promote pathogen expansion through the same mechanism:
depletion of butyrate-producing Clostridia to elevate epithelial oxygenation,
allowing aerobic Salmonella growth.