期刊
FISH & SHELLFISH IMMUNOLOGY
卷 33, 期 4, 页码 690-698出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2012.05.035
关键词
IRAK-4; IL-1 beta; Roughskin sculpin Trachidermus fasciatus; LPS; Gene expression
资金
- Third Institute of Oceanography, State Oceanic Administration [HE09701 (1), HE09702 (1)]
- International Cooperation Department, State Oceanic Administration [HC10701-10(1)]
- Environmental Protection Department, State Oceanic Administration [HD10301-10(1)]
- Commonweal Project, State Oceanic Administration, China [201105011]
- Shandong Natural Science Foundation [Y2007D75]
Toll-like receptor (TLR) signaling pathway plays a crucial role in innate immune responses. In the present study, we first identified and characterized a key TLR pathway signal transduction molecule interleukin-1 receptor-associated kinase 4 (IRAK-4), and an important signal-out molecule interleukin-1 beta (IL-1 beta) from roughskin sculpin (Trachidermus fasciatus). IRAK-4 had an open reading frame (ORF) of 1401 bp, which encoded a protein of 467 amino acids with a highly conserved death domain (DD) and a serine/threonine/tyrosine protein kinase domain (STYKc). The full-length cDNA of IL-1 beta was 1242 bp with a 756 bp ORF, encoding a protein of 252 amino acids. Neither a signal peptide nor an IL-1 beta-converting enzyme (ICE) cleavage site was detected in this protein. Both genes were broadly expressed in all the ten examined tissues, with the highest transcript level in the skin, indicating that the host could trigger rapid immune responses in infected tissues through TLR signaling pathway. Quantitative real-time polymerase chain reaction was employed to investigate their temporal expression profiles post lipopolysaccharide challenge. The transcripts of both genes were significantly increased in the skin, blood, liver, spleen, and brain. It was shown that the transcript of IL-1 beta was dramatically induced to 700 times higher than that of the control group in the blood and liver. These results indicate that TLR signaling process may play an important role in fish immune response against microbial infections. (C) 2012 Elsevier Ltd. All rights reserved.
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