Abstract
Bacteriophage are abundant at sites of bacterial infection, but their effects on mammalian hosts are unclear. We have identified pathogenic roles for filamentous Pf bacteriophage produced by Pseudomonas aeruginosa (Pa) in suppression of immunity against bacterial infection. Pf promote Pa wound infection in mice and are associated with chronic human Pa wound infections. Murine and human leukocytes endocytose Pf, and internalization of this single-stranded DNA virus results in phage RNA production. This triggers Toll-like receptor 3 (TLR3)– and TIR domain–containing adapter-inducing interferon-b (TRIF)–dependent type I interferon production, inhibition of tumor necrosis factor (TNF), and the suppression of phagocytosis. Conversely, immunization of mice against Pf prevents Pa wound infection. Thus, Pf triggers maladaptive innate viral pattern-recognition responses, which impair bacterial clearance. Vaccination against phage virions represents a potential strategy to prevent bacterial infection.
| Original language | English |
|---|---|
| Article number | eaat9691 |
| Journal | Science |
| Volume | 363 |
| Issue number | 6434 |
| DOIs | |
| State | Published - Mar 29 2019 |
Funding
We thank M. Butte, T. Wang, and C. Blish for their critical reading of the manuscript. We are grateful to S. Rice for sharing PAO1DPf4 and its isogenic PAO1 strain. Ifnar−/− and Ifnr−/− mice were gifts from S.-Y. Pu and S. Einav. Cgas−/− and Sting−/− mice were gifts from V. Boehnert and L. Li. RAW64.7 and L929 ISRE reporter cell lines were gifts from S. Brubaker. The pUT-Tn5-EM7-lux-Km1 luminescent construct vector was a gift from J. Hardy. Special thanks to T. Thauland, K. Yadava, and S. M. Ruppert for their technical expertise. This work was supported by grants R21AI133370, R21AI133240, R01AI12492093, and grants from Stanford SPARK and by the Falk Medical Research Trust and the Cystic Fibrosis Foundation (CFF) to P.L.B. A Gabilan Stanford Graduate Fellowship for Science and Engineering and a Lubert Stryer Bio-X Stanford Interdisciplinary Graduate Fellowship supported J.M.S. P.R.S was supported by NIH grants K22AI125282, R01AI138981, and P20GM103546. G.K. was supported by the Stanford Diabetes Research Center (SDRC) under award no. P30DK116074. S.G.K. was supported by NIH grant R01GM111808. The use of the transmission electron microscope was supported, in part, by ARRA award no. 1S10RR026780-F Resources (NCRR).
| Funder number |
|---|
| R01GM111808, P20GM103546, K22AI125282, 1S10RR026780-F |
| R01AI138981 |
| R01AI12492093, R21AI133370, R21AI133240 |
| P30DK116074 |