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Identification and expression analysis of a CC chemokine from cobia (Rachycentron canadum)

文献类型： 外文期刊

作者： Feng, Juan 1 ; Su, Youlu 1 ; Guo, Zhixun 2 ; Xu, Liwen 1 ; Sun, Xiuxiu 3 ; Wang, Yunxin 3 ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab South China Sea Fishery Resources Exploit, Minist Agr, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

2.Chinese Acad Fishery Sci, Key Lab Aquat Prod Proc, Minist Agr, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

3.Guangdong Prov Aquat Anim Epidem Dis Prevent & Co, Guangzhou 510222, Guangdong, Peoples R China

关键词： CC chemokine;Cobia;Cloning;Expression analysis;Immune response

期刊名称：FISH PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：2.794； 五年影响因子：2.876 ）

ISSN：

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收录情况： SCI

摘要： Chemokines are small, secreted cytokine peptides known principally for their ability to induce migration and activation of leukocyte populations and regulate the immune response mechanisms. The cobia (Rachycentron canadum), a marine finfish species, has a great potential for net cage aquaculture in the South China Sea. We isolated and characterized a CC chemokine cDNA from cobia-designated RcCC2. Its cDNA is 783 bp in length and encodes a putative protein of 110 amino acids. Homology and phylogenetic analysis revealed that the RcCC2 gene, which contains four conserved cysteine residues, shares a high degree of similarity with other known CC chemokine sequences and is closest to the CCL19/21 clade. The mRNA of RcCC2 is expressed constitutively in all tested tissues, including gill, liver, muscle, spleen, kidney, head kidney, skin, brain, stomach, intestine and heart, but not blood, with the highest level of expression in gill and liver. The reverse transcription quantitative polymerase chain reaction was used to examine the expression of the RcCC2 gene in immune-related tissues, including head kidney, spleen and liver, following intraperitoneal injection of the viral mimic polyriboinosinic polyribocytidylic acid, formalin-killed Vibrio carchariae (bacterial vaccine) and phosphate-buffered saline as a control. RcCC2 gene expression was up-regulated differentially in head kidney, spleen and liver during 12 h after challenge. These results indicate that the RcCC2 gene is inducible and is involved in immune responses, suggesting RcCC2 has an important role in the early stage of viral and bacterial infections.

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