The food-borne pathogen Campylobacter jejuni responds to the bile salt deoxycholate with countermeasures to reactive oxygen species
| Autor: | Christopher R. Gourley, Joshua N. Adkins, Nicholas M. Negretti, Michael E. Konkel, Geremy Clair |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
030106 microbiology lcsh:Medicine Campylobacter jejuni Article Microbiology Superoxide dismutase 03 medical and health sciences chemistry.chemical_compound Bacterial Proteins Campylobacter Infections Humans Intestinal Mucosa lcsh:Science chemistry.chemical_classification Reactive oxygen species Multidisciplinary biology Superoxide Succinate dehydrogenase Gene Expression Profiling lcsh:R Gene Expression Regulation Bacterial biology.organism_classification Adaptation Physiological Succinate Dehydrogenase chemistry Biochemistry Catalase Host-Pathogen Interactions biology.protein lcsh:Q Digestion Reactive Oxygen Species Bacteria Deoxycholic Acid |
| Zdroj: | Scientific Reports Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017) |
| ISSN: | 2045-2322 |
| Popis: | Bile plays an important role in digestion, absorption of fats, and the excretion of waste products, while concurrently providing a critical barrier against colonization by harmful bacteria. Previous studies have demonstrated that gut pathogens react to bile by adapting their protein synthesis. The ability of pathogens to respond to bile is remarkably complex and still incompletely understood. Here we show that Campylobacter jejuni, a leading bacterial cause of human diarrheal illness worldwide, responds to deoxycholate, a component of bile, by altering global gene transcription in a manner consistent with a strategy to mitigate exposure to reactive oxygen stress. More specifically, continuous growth of C. jejuni in deoxycholate was found to: 1) induce the production of reactive oxygen species (ROS); 2) decrease succinate dehydrogenase activity (complex II of the electron transport chain); 3) increase catalase activity that is involved in H2O2 breakdown; and 4) result in DNA strand breaks. Congruently, the addition of 4-hydroxy-TEMPO (TEMPOL), a superoxide dismutase mimic that reacts with superoxide, rescued the growth of C. jejuni cultured in the presence of deoxycholate. We postulate that continuous exposure of a number of enteric pathogens to deoxycholate stimulates a conserved survival response to this stressor. |
| Databáze: | OpenAIRE |
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