殖民地化
肺炎克雷伯菌
生物
肠道菌群
微生物学
败血症
抗生素
离体
体内
殖民抵抗
免疫学
大肠杆菌
生物化学
生物技术
基因
作者
Aaron L. Hecht,Lisa Harling,Elliot S. Friedman,Ceylan Tanes,Junhee Lee,Jenni Firrman,Fuhua Hao,Vincent Tu,LinShu Liu,Andrew D. Patterson,Kyle Bittinger,Mark Goulian,Gary D. Wu
摘要
Bacterial translocation from the gut microbiota is a source of sepsis in susceptible patients. Previous work suggests that overgrowth of gut pathobionts, including Klebsiella pneumoniae, increases the risk of disseminated infection. Our data from a human dietary intervention study found that in the absence of fiber, K. pneumoniae bloomed during microbiota recovery from antibiotic treatment. We thus hypothesized that dietary nutrients directly support or suppress colonization of this gut pathobiont in the microbiota. Consistent with our human subject study, complex carbohydrates in dietary fiber suppressed colonization of K. pneumoniae and allowed for recovery of competing commensals in mouse modeling. In contrast, through ex-vivo and in vivo modeling, we identify simple carbohydrates as a limiting resource for K. pneumoniae in the gut. As proof of principle, supplementation with lactulose, a non-absorbed simple carbohydrate and an FDA approved therapy, increased colonization of K. pneumoniae. Disruption of the intestinal epithelium led to dissemination of K. pneumoniae into the bloodstream and liver, which was prevented by dietary fiber. Our results show that dietary simple and complex carbohydrates are critical not only in the regulation of pathobiont colonization but also disseminated infection, suggesting that targeted dietary interventions may offer a preventative strategy in high-risk patients.
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