Characterization, promoter analysis and expression of the interleukin-6 gene in blunt snout bream, Megalobrama amblycephala

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• 作者：Xiaoqin Fu ; Zhujin Ding ; Jun Fan ; Huanling Wang…
• 关键词：Megalobrama amblycephala ; Interleukin ; 6 ; Sequence analysis ; Promoter ; Aeromonas hydrophila ; Transcript level
• 刊名：Fish Physiology and Biochemistry
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：42
• 期：6
• 页码：1527-1540
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Freshwater & Marine Ecology; Animal Physiology; Animal Anatomy / Morphology / Histology; Animal Biochemistry; Zoology;
• 出版者：Springer Netherlands
• ISSN：1573-5168
• 卷排序：42

文摘

Interleukin-6 (IL-6) is one of the most important multifunctional cytokines, playing essential roles in mediating the innate and adaptive immune responses. In this study, il-6 gene and its promoter from blunt snout bream, Megalobrama amblycephala, were characterized, and its expression at the transcript level in healthy fish and after bacterial infection was determined by quantitative real-time PCR. The results showed that the M. amblycephalail-6 (Mamil-6) cDNA had an ORF of 699 bp, encoding 232 amino acids, and contained 9 instable motifs in the 3′ UTR. The deduced MamIL-6 possessed a 24-amino acid signal peptide and was located in the cytoplasm. Although sequence alignment and phylogenetic analysis revealed that IL-6 is poorly conserved in vertebrates, the protein and genomic structure of il-6 gene was well conserved. Analysis of the Mamil-6 promoter revealed the presence of a conserved TATA box and six major cis-regulatory elements, including C/EBPβ (NF-IL6), AP-1, CRE, GRE, GATA and NF-κB binding sites. In healthy fish, Mamil-6 was the most abundant in the spleen. After Aeromonas hydrophila infection, Mamil-6 was significantly up-regulated in all 6 immune-related tissues examined, suggesting that Mamil-6 plays an important role in the blunt snout bream immune system.