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Pubmed ID :18849341
Publication Date : 2008/12/01

FLN29 deficiency reveals its negative regulatory role in the Toll-like receptor (TLR) and retinoic acid-inducible gene I (RIG-I)-like helicase signaling pathway.


FLN29 was identified as an interferon (IFN)-inducible gene, and it has been shown to suppress Toll-like receptor 4-mediated NF-kappaB activation by binding to TRAF6. To elucidate the physiological roles of FLN29, we generated FLN29-deficient mice. FLN29 deficiency resulted in hyper-response to LPS both in vivo and in vitro, demonstrating the negative regulatory role of FLN29 in TLR4 signaling. Furthermore, we found that FLN29(-/-) mice exhibited increased susceptibility to poly(I:C)-induced septic shock compared with WT mice. FLN29(-/-) fibroblasts were highly resistant to vesicular stomatitis virus infection, and these cells produced more IFN-beta than WT cells did in response to not only intracellular poly(I:C) but also overexpression of IPS-1. Forced expression of FLN29 inhibited the IPS-1-dependent activation of both NF-kappaB and IRF3. We also found that FLN29 could interact with TRIF, IPS-1, TRAF3, and TRAF6. Together, these results suggest that FLN29, in addition to playing a negative regulatory role in the TLR4 signaling pathway, negatively regulates the RIG-I-like helicase signaling pathway at the level of IPS-1/TRAF6 and IPS-1/TRAF3 complexes.

Authors : Sanada Takahito , Takaesu Giichi , Mashima Ryuichi , Yoshida Ryoko , Kobayashi Takashi , Yoshimura Akihiko ,

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