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Skjæveland, Ingrid; Iliev, Dimitar B.; Strandskog, Guro; Jørgensen, Jorunn B.
Developmental and comparative immunology, 09/2009, Letnik: 33, Številka: 9Journal Article
Toll-like receptor 8 (TLR 8) belongs to a subgroup of the TLR family that recognizes nucleic acids and that is involved in the protection against viruses. In mammals, TLR7 and 8 have been characterized as receptors for viral and synthetic single-stranded RNA. Here we describe the cloning of a TLR8 homolog in Atlantic salmon (Salmo salar) and its proximal adaptor protein MyD88. The mRNA expression of SsTLR8 was tissue-restricted and its highest level was detected in the spleen while SsMyD88 was expressed in all of the tested organs. SsTLR8 and SsMyD88 mRNAs were up-regulated in TO cells treated with recombinant IFN α1 and IFN γ. In vivo, the expression of SsTLR8 was not significantly affected following challenge with salmon alphavirus subtype 3 (SAV3). By contrast, infection with SAV3 up-regulated SsMyD88 transcripts on day 7 post-challenge and the expression remained elevated at day 28. The SsMyD88 expression in vivo paralleled type I IFN expression. In vitro stimulation of salmon head kidney leukocytes with CpG ODNs and IFN γ also up-regulated SsMyD88 mRNA. Furthermore, ectopic expression of SsMyD88 in HEK cells was able to activate a NF-κB reporter construct indicating that the cloned salmon molecule was a functional MyD88 homologue.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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