Journal article

Mechanism of up-regulation of human Toll-like receptor 3 secondary to infection of measles virus-attenuated strains

Tanabe M, Kurita-Taniguchi M, Takeuchi K, Takeda M, Ayata M, Ogura H, Matsumoto M, Seya T ...see all

Biochemical and Biophysical Research Communications, vol. 311, issue 1 (2003) pp. 39-48 Published by Academic Press Inc.

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PolyI:C, a synthetic double-stranded (ds)RNA, and viruses act on cells to induce IFN-β which is a key molecule for anti-viral response. Although dsRNA is a virus-specific signature and a ligand for human Toll-like receptor 3 (TLR3), largely uncharacterized multiple pathways associate virus-mediated IFN-β induction. Here, we demonstrated that laboratory-adapted but not wild-type strains of measles virus (MV) up-regulated TLR3 expression both in dendritic cells and epithelial cell line A549. The kinetics experiments with the laboratory MV strain revealed that TLR3 was induced late compared to IFN-β and required new protein synthesis. Furthermore, neutralizing antibodies against IFN-β or IFNAR (Interferon-α/β receptor) suppressed MV-induced TLR3 induction, indicating that type I IFN, IFN-α/β, is critical for MV-mediated TLR3 induction. Yet, a recently identified virus-inducible IFN, the IFN-λ, did not contribute to TLR3 expression. A virus-responsive element that up-regulates TLR3 was identified in the TLR3-promoter region by reporter gene experiments. The ISRE, a recently reported site for IFN-β induction, but not STAT binding site, located around -30bp of TLR3 promoter responded to MV to induce TLR3 expression. This further indicates the importance of type I IFN for TLR3 up-regulation in the case of viral infection. In HeLa and MRC5 cells, augmented production of IFN-β was observed in response to dsRNA when TLR3 had been induced beforehand. Thus, the MV-induced expression of TLR3 may reflect amplified IFN production that plays a part in host defense to viral infection. © 2003 Elsevier Inc. All rights reserved.

Author-supplied keywords

  • IFN-α/β
  • ISRE
  • Measles virus
  • Toll-like receptor 3
  • Transcriptional regulation

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  • Masako Tanabe

  • Mitsue Kurita-Taniguchi

  • Kaoru Takeuchi

  • Makoto Takeda

  • Minoru Ayata

  • Hisashi Ogura

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