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Nat Immunol. 2006 Mar;7(3):318-25. Epub 2006 Jan 29.

The Birc1e cytosolic pattern-recognition receptor contributes to the detection and control of Legionella pneumophila infection.

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  • 1Section of Microbial Pathogenesis, Yale University School of Medicine, New Haven, Connecticut 06536, USA.

Abstract

Baculovirus inhibitor of apoptosis repeat-containing 1 (Birc1) proteins have homology to several germline-encoded receptors of the innate immune system. However, their function in immune surveillance is not clear. Here we describe a Birc1e-dependent signaling pathway that restricted replication of the intracellular pathogen Legionella pneumophila in mouse macrophages. Translocation of bacterial products into host-cell cytosol was essential for Birc1e-mediated control of bacterial replication. Caspase-1 was required for Birc1e-dependent antibacterial responses ex vivo in macrophages and in a mouse model of Legionnaires' disease. The interleukin 1beta converting enzyme-protease-activating factor was necessary for L. pneumophila growth restriction, but interleukin 1beta was not required. These results establish Birc1e as a nucleotide-binding oligomerization-leucine-rich repeat protein involved in the detection and control of intracellular L. pneumophila.

PMID:
16444259
[PubMed - indexed for MEDLINE]
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