期刊
FASEB JOURNAL
卷 32, 期 5, 页码 2779-2793出版社
WILEY
DOI: 10.1096/fj.201701006R
关键词
signaling; superinfection; caspase-8; accessory gene regulator locus
资金
- Jurgen Manchot Foundation
- Deutsche Forschungsgemeinschaft [SFB 1009]
- Innovative Medical Research Fund Grant [EH121307]
- Interdisziplinares Zentrum fur Klinische Forschung (IZKF
- Interdisciplinary Center for Clinical Research) Grant [EhC2/006/15]
Superinfections with Staphylococcus aureus are a major complication of influenza disease, causing excessive inflammation and tissue damage. This enhanced cell-damaging effect is also observed in superinfected tissue cultures, leading to a strong decrease in overall cell viability. In our analysis of the underlying molecular mechanisms, we observed that, despite enhanced cell damage in superinfection, S. aureus did not increase but rather inhibited influenza virus (IV)-induced apoptosis in cells on the level of procaspase-8 activation. This apparent contradiction was solved when we observed that S. aureus mediated a switch from apoptosis to necrotic cell death of IV-infected cells, a mechanism that was dependent on the bacterial accessory gene regulator (agr) locus that promotes bacterial survival and spread. This so far unknown action may be a bacterial strategy to enhance dissemination of intracellular S. aureus and may thereby contribute to increased tissue damage and severity of disease.
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