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Molecular cloning and mRNA expression analysis of interleukin-8 gene in Japanese sea perch (Lateolabrax japonicus)

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Abstract

Interleukin-8 (IL-8), the first known chemokine, is a CXC chemokine, which is cable of attracting neutrophils and inducing them to release lysozomal enzymes, triggering the respiratory burst. In the present study, the cDNA of an IL-8 was cloned from Japanese sea perch Lateolabrax japonicus (designated LjIL-8) by homology cloning and rapid amplification of cDNA ends (RACE) approaches. The full-length cDNA of LjIL-8 consisted of 803 nucleotides with a canonical polyadenylation signal sequence AATAAA and a poly(A) tail, and an open reading frame (ORF) of 300 bp encoding a polypeptide of 99 amino acid residues with a predicted molecular weight of 6.6 kDa. The high identity of LjIL-8 with IL-8 in other organisms indicated that LjIL-8 should be a new member of the IL-8 family. By fluorescent quantitative real-time PCR, mRNA transcript of LjIL-8 was detectable in all the examined tissues with higher level in spleen and head-kidney. The temporal expression of LjIL-8 mRNA in the spleen was up-regulated by lipopolyssacharide (LPS) stimulation and reached the maximum level at 6 h post-stimulation, and then dropped back to the original level gradually. These results indicated that LjIL-8 was a constitutive and inducible acute-phase protein that perhaps involved in the immune defense of L. japonicus.

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Acknowledgments

This work was supported by a grant from the GuangDong Province of China (2005B20301023), Agriculture Department Project of China (06-05-01B) and National Project of China (2006BAD01A13)

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Authors and Affiliations

  1. Biotechnology and aquiculture Laboratory, The South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 231 Xingangxi Road, Guangzhou, 510300, People’s Republic of China

    Lihua Qiu, Hanhua Zhang, Keng Yang & Shigui Jiang

  2. The Centre for Applied Aquatic Genomics, Chinese Academy of Fishery Sciences, Beijing , 100039, People’s Republic of China

    Lihua Qiu

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  1. Lihua Qiu
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  2. Hanhua Zhang
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  4. Shigui Jiang
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Correspondence to Shigui Jiang.

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Qiu, L., Zhang, H., Yang, K. et al. Molecular cloning and mRNA expression analysis of interleukin-8 gene in Japanese sea perch (Lateolabrax japonicus). Mol Biol Rep 36, 1099–1105 (2009). https://doi.org/10.1007/s11033-008-9284-6

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  • DOI: https://doi.org/10.1007/s11033-008-9284-6

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