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IFN-α Enhances TLR3-Mediated Antiviral Cytokine Expression in Human Endothelial and Epithelial Cells by Up-Regulating TLR3 Expression

Open access
Tissari, Jorma, Sirén, Jukka, Meri, Seppo, Julkunen, Ilkka, Matikainen, Sampsa·2005·The Journal of Immunology

Abstract

TLRs play a critical role in early innate immune response to virus infection. TLR3 together with TLR7 and TLR8 constitute a powerful system to detect genetic material of RNA viruses. TLR3 has been shown to bind viral dsRNA whereas TLR7 and TLR8 are receptors for viral single-stranded RNA. In this report we show that TLR7 or TLR8 are not expressed in human epithelial A549 cells or in HUVECs. Accordingly, A549 cells and HUVECs were unresponsive to TLR7/8 ligand R848. TLR3 was expressed at a higher level in HUVECs than in A549 cells. The TLR3 ligand poly(I:C) up-regulated IFN-β, IL-28, IL-29, STAT1, and TLR3 expression in HUVECs but not in A549 cells. An enhanced TLR3 expression by transfection or by IFN-α stimulation conferred poly(I:C) responsiveness in A549 cells. Similarly, IFN-α pretreatment strongly enhanced poly(I:C)-induced activation of IFN-β, IL-28, and IL-29 genes also in HUVECs. In conclusion, our results suggest that IFN-α-induced up-regulation of TLR3 expression is involved in dsRNA activated antiviral response in human epithelial and endothelial cells.

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Metadata

Authors
Tissari, J., Sirén, J., Meri, S., Julkunen, I., & Matikainen, S.
Venue
The Journal of Immunology
Published
2005-04-01
Volume
174
Issue
7
Pages
4289-4294
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2124473438
Cited by
190
References
4
FWCI
5.79
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: IFN-α Enhances TLR3-Mediated Antiviral Cytokine Expression in Human Endothelial and Epithelial Cells by Up-Regulating TLR3 Expression. https://app.cochat.ai/papers/10.4049/jimmunol.174.7.4289
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Tissari, J., Sirén, J., Meri, S., Julkunen, I., & Matikainen, S. (2005). IFN-α Enhances TLR3-Mediated Antiviral Cytokine Expression in Human Endothelial and Epithelial Cells by Up-Regulating TLR3 Expression. The Journal of Immunology. https://doi.org/10.4049/jimmunol.174.7.4289

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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