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Cell Host Microbe. 2014 Feb 12;15(2):214-27. doi: 10.1016/j.chom.2014.01.010.

Caspase-1 cleavage of the TLR adaptor TRIF inhibits autophagy and β-interferon production during Pseudomonas aeruginosa infection.

Author information

1
Institute of Immunity, Infection and Inflammation, University of Glasgow, Glasgow G12 8TA, UK; University of Technology, Applied Science School, Biotechnology Department, Baghdad, Iraq.
2
Institute of Immunity, Infection and Inflammation, University of Glasgow, Glasgow G12 8TA, UK.
3
Department of Veterinary Medicine, University of Cambridge, Cambridge, CB3 0ES UK.
4
Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, OX3 9DS, UK.
5
Department of Pathology, Western Infirmary, Glasgow G11 6NT, UK.
6
Institute of Immunity, Infection and Inflammation, University of Glasgow, Glasgow G12 8TA, UK. Electronic address: tom.evans@glasgow.ac.uk.

Abstract

Bacterial infection can trigger autophagy and inflammasome activation, but the effects of inflammasome activation on autophagy are unknown. We examined this in the context of Pseudomonas aeruginosa macrophage infection, which triggers NLRC4 inflammasome activation. P. aeruginosa induced autophagy via TLR4 and its adaptor TRIF. NLRC4 and caspase-1 activation following infection attenuated autophagy. Caspase-1 directly cleaved TRIF to diminish TRIF-mediated signaling, resulting in inhibition of autophagy and in reduced type I interferon production. Expression of a caspase-1 resistant TRIF mutant enhanced autophagy and type I interferon production following infection. Preventing TRIF cleavage by caspase-1 in an in vivo model of P. aeruginosa infection resulted in enhanced bacterial autophagy, attenuated IL-1β production, and increased bacterial clearance. Additionally, TRIF cleavage by caspase-1 diminished NLRP3 inflammasome activation. Thus, caspase-1 mediated TRIF cleavage is a key event in controlling autophagy, type I interferon production, and inflammasome activation with important functional consequences.

PMID:
24528867
DOI:
10.1016/j.chom.2014.01.010
[Indexed for MEDLINE]
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