RICK/RIP2 mediates innate immune responses induced through Nod1 and Nod2 but not TLRs

Jong Hwan Park, Yun Gi Kim, Christine McDonald, Thirumala Devi Kanneganti, Mizuho Hasegawa, Mathilde Body-Malapel, Naohiro Inohara, Gabriel Núñez

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Abstract

RICK is a kinase that has been implicated in Nod1 and Nod2 signaling. In addition, RICK has been proposed to mediate TLR signaling in that its absence confers reduced responses to certain bacterial products such as LPS. We show here that macrophages and mice lacking RICK are defective in their responses to Nod1 and Nod2 agonists but exhibit unimpaired responses to synthetic and highly purified TLR agonists. Furthermore, production of chemokines induced by the bacterial dipeptide γ-D-glutamyl-meso-diaminopimelic acid was intact in MyD88 deficient mice but abolished in RICK-null mice. Stimulation of macrophages with muramyl dipeptide, the Nod2 activator, enhanced immune responses induced by LPS, IFN-γ, and heat-killed Listeria in wild-type but not in RICK- or Nod2-deficient macrophages. Finally, we show that the absence of RICK or double deficiency of Nod1 and Nod2 was associated with reduced cytokine production in Listeria-infected macrophages. These results demonstrate that RICK functions in innate immunity by mediating Nod1 and Nod2 signaling but not TLR-mediated immune responses.

Original languageEnglish
Pages (from-to)2380-2386
Number of pages7
JournalJournal of Immunology
Volume178
Issue number4
DOIs
Publication statusPublished - 2007 Feb 15
Externally publishedYes

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ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Cite this

Park, J. H., Kim, Y. G., McDonald, C., Kanneganti, T. D., Hasegawa, M., Body-Malapel, M., Inohara, N., & Núñez, G. (2007). RICK/RIP2 mediates innate immune responses induced through Nod1 and Nod2 but not TLRs. Journal of Immunology, 178(4), 2380-2386. https://doi.org/10.4049/jimmunol.178.4.2380