Salmonella enterica serovar Typhimurium uses anaerobic respiration to overcome propionate-mediated colonization resistance.

Salmonella enterica serovar Typhimurium uses anaerobic respiration to overcome propionate-mediated colonization resistance.
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沙门氏菌肠鼠伤寒使用厌氧呼吸来克服丙酸介导的定殖抗性。

DOI:
10.1016/j.celrep.2021.110180
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发表时间:
2022-01-04
期刊:
影响因子:
8.8
通讯作者:
Byndloss MX
Byndloss MX
中科院分区:
生物学1区
文献类型:
--
作者:
Shelton CD;Yoo W;Shealy NG;Torres TP;Zieba JK;Calcutt MW;Foegeding NJ;Kim D;Kim J;Ryu S;Byndloss MX

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肠道微生物群通过限制肠道病原体扩张(定植抗性),部分通过产生抑制性代谢物对宿主有益。丙酸是一种由微生物群成员产生的短链脂肪酸,被认为可以介导对肠道沙门氏菌血清型鼠伤寒沙门氏菌(S. Tm)的定植抗性。在这里,我们发现S. Tm通过使用丙酸作为厌氧呼吸的碳源来克服丙酸的抑制作用。我们确定丙酸代谢在感染期间为S. Tm提供了炎症依赖的定植优势。这种益处在沙门氏菌感染的无菌小鼠的肠道内被废除。有趣的是,当无菌小鼠被肠道中主要的丙酸产生菌拟杆菌(B. theta)单定殖时,S. Tm丙酸介导的肠道扩张得以恢复,但当小鼠被丙酸产生缺陷的B. theta菌株单定殖时,则没有恢复。综上所述,我们的研究结果揭示了S. Tm通过代谢微生物群衍生的丙酸酯来减轻定植抗性的策略。丙酸酯是一种由肠道微生物群产生的短链脂肪酸,可以介导对肠沙门氏菌血清型鼠伤寒沙门氏菌(S. Tm)的定植抗性。在这里,Shelton等人表明硝酸盐依赖的丙酸代谢促进了炎症肠道中病原体的扩张,使S. Tm克服了丙酸的抑制作用。
The gut microbiota benefits the host by limiting enteric pathogen expansion (colonization resistance), partially via the production of inhibitory metabolites. Propionate, a short-chain fatty acid produced by microbiota members, is proposed to mediate colonization resistance against Salmonella enterica serovar Typhimurium (S. Tm). Here, we show that S. Tm overcomes the inhibitory effects of propionate by using it as a carbon source for anaerobic respiration. We determine that propionate metabolism provides an inflammation-dependent colonization advantage to S. Tm during infection. Such benefit is abolished in the intestinal lumen of Salmonella-infected germ-free mice. Interestingly, S. Tm propionate-mediated intestinal expansion is restored when germ-free mice are monocolonized with Bacteroides thetaiotaomicron (B. theta), a prominent propionate producer in the gut, but not when mice are monocolonized with a propionate-production-deficient B. theta strain. Taken together, our results reveal a strategy used by S. Tm to mitigate colonization resistance by metabolizing microbiota-derived propionate Propionate, a short-chain fatty acid produced by the gut microbiota, is proposed to mediate colonization resistance against Salmonella enterica serovar Typhimurium (S. Tm). Here, Shelton et al. show that nitrate-dependent propionate metabolism fuels pathogen expansion in the inflamed gut, allowing S. Tm to overcome propionate’s inhibitory effects.
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