期刊
JOURNAL OF IMMUNOLOGY
卷 205, 期 6, 页码 1601-1607出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.2000094
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资金
- Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health [R21 AI128527]
- National Heart, Lung, and Blood Institute, National Institutes of Health [R01 HL118408]
- Nebraska Research Initiative
- Fred and Pamela Buffett Cancer Center's National Cancer Institute Cancer Support Grant
Secondary Streptococcus pneumoniae infection is a significant cause of morbidity and mortality during influenza epidemics and pandemics. Multiple pathogenic mechanisms, such as lung epithelial damage and dysregulation of neutrophils and alveolar macrophages (AMs), have been suggested to contribute to the severity of disease. However, the fundamental reasons for influenza-induced susceptibility to secondary bacterial pneumonia remain unclear. In this study, we revisited these controversies over key pathogenic mechanisms in a lethal model of secondary bacterial pneumonia with an S. pneumoniae strain that is innocuous to mice in the absence of influenza infection. Using a series of in vivo models, we demonstrate that rather than a systemic suppression of immune responses or neutrophil function, influenza infection activates IFN-gamma R signaling and abrogates AM-dependent bacteria clearance and thereby causes extreme susceptibility to pneumococcal infection. Importantly, using mice carrying conditional knockout of Ifngr1 gene in different myeloid cell subsets, we demonstrate that influenza-induced IFN-gamma R signaling in AMs impairs their antibacterial function, thereby enabling otherwise noninvasive S. pneumoniae to cause deadly pneumonia.
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