CARD6 is a modulator of NF-κB activation by Nod1- and cardiak-mediated pathways

Christian Stehlik, Hideki Hayashi, Frederick Pio, Adam Godzik, John C. Reed*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

We cloned a novel cDNA derived from the CARD6 gene locus on chromosome 5p12 of 311 amino acids in length. By immunoprecipitation we detected specific binding of this CARD6-encoding protein to Nod1 (CARD4), Cardiak (Rip2/Rick), NAC (NALP1/DEFCAP/CARD7), and TUCAN (CARD8/Cardinal/NDPP/Dakar), caspase recruitment domain (CARD)-containing proteins implicated in NF-κB and caspase-1 activation but not to other CARD family proteins. Cardiak and Nod1 (but not other CARD proteins) also exhibited opposing effects on CARD6 protein phosphorylation and expression, providing further evidence of functional interactions among these proteins in cells. In transfection experiments, the CARD6 protein suppressed NF-κB induction by Nod1 or Cardiak but did not interfere with NF-κB activation by the CARD-containing adapter protein Bcl10 or the cytokine tumor necrosis factor-α, demonstrating specificity of CARD6 for Nod-1 and Cardiak-dependent pathways. In contrast to its effects on Nod1- and Cardiak-dependent NF-κB activation, CARD6 did not interfere with caspase-1-dependent interleukin-1β secretion induced by Cardiak or Nod1. CARD6 also did not affect caspase activation and apoptosis induced by overexpression of Fas, Bax, or other pro-apoptotic stimuli. Thus, CARD6 represents a selective modulator of NF-κB activation by Cardiak and Nod1, adding to the repertoire of CARD-family proteins implicated in inflammatory responses and innate immunity.

Original languageEnglish (US)
Pages (from-to)31941-31949
Number of pages9
JournalJournal of Biological Chemistry
Volume278
Issue number34
DOIs
StatePublished - Aug 22 2003

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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