Title

Requirement for a conserved Toll/interleukin-1 resistance domain protein in the Caenorhabditis elegans immune response

UMMS Affiliation

Department of Medicine, Division of Infectious Diseases and Immunology

Date

5-5-2004

Document Type

Article

Subjects

Animals; Base Sequence; Caenorhabditis elegans; DNA Primers; Enzyme Activation; Gene Expression Regulation; Membrane Glycoproteins; Mitogen-Activated Protein Kinases; Receptors, Interleukin-1; Signal Transduction; p38 Mitogen-Activated Protein Kinases

Abstract

The p38 mitogen-activated protein kinase pathway regulates innate immune responses in evolutionarily diverse species. We have previously shown that the Caenorhabditis elegans p38 mitogen-activated protein kinase, PMK-1, functions in an innate immune response pathway that mediates resistance to a variety of microbial pathogens. Here, we show that tir-1, a gene encoding a highly conserved Toll/IL-1 resistance (TIR) domain protein, is also required for C. elegans resistance to microbial pathogens. RNA interference inactivation of tir-1 resulted in enhanced susceptibility to killing by pathogens and correspondingly diminished PMK-1 phosphorylation. Unlike all known TIR-domain adapter proteins, overexpression of the human TIR-1 homologue, SARM, in mammalian cells was not sufficient to induce expression of NF-kappaB or IRF3-dependent reporter genes that are activated by Toll-like receptor signaling. These data reveal the involvement of a previously uncharacterized, evolutionarily conserved TIR domain protein in innate immunity that is functionally distinct from other known TIR domain signaling adapters.

Rights and Permissions

Citation: Proc Natl Acad Sci U S A. 2004 Apr 27;101(17):6593-8. Link to article on publisher's site

Related Resources

Link to Article in PubMed

PubMed ID

15123841