title: Molecular cloning and expression of orange-spotted grouper (Epinephelus coioides) CD8α and CD8β genes.
abstract: T-cell surface glycoprotein CD8 consists of two distinguished chains, termed α and β chains, and functions as a co-receptor for the T-cell receptor by binding to MHC class I proteins. In this study we report the cloning and identification of both CD8α and CD8β genes from orange-spotted grouper (Epinephelus coioides). The predicted grouper CD8α and CD8β proteins were structurally similar to other fish especially to those of Pleuronectiformes. Real-time RT-PCR revealed that the CD8 mRNA was much higher in the thymus than in other immune organs, and the expression level were very low in stomach, liver, and brain. During embryonic development of the grouper, the highest CD8 transcripts were detected in the multi-cell stage, followed by muscle burl stage, which suggested that the multi-cell stage may be critical in CD8 transcript synthesis. Moreover, CD8 mRNA levels were examined in lymphocytes at different time treated with lipopolysaccharide (LPS), polyriboinosinic polyribocytidylic acid (PolyI:C), phytohemagglutinin (PHA), and concanavalin A (ConA). The result showed that the CD8 mRNA levels were significantly affected in time-dependent manner by PolyI:C, PHA, and ConA, but not by LPS.
authors.affiliation: Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Sheng-wei
authors.initials: SW
authors.lastname: Xu
authors.forename: Jin-ying
authors.initials: JY
authors.lastname: Wu
authors.forename: Kai-shun
authors.initials: KS
authors.lastname: Hu
authors.forename: Hai-lin
authors.initials: HL
authors.lastname: Ping
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Duan
authors.forename: Hai-fa
authors.initials: HF
authors.lastname: Zhang
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology; D000595:Amino Acid Sequence; D000818:Animals; D016827:CD8 Antigens / Q000737:chemistry / Q000235:genetics* / Q000276:immunology*; D003001:Cloning, Molecular; D005786:Gene Expression Regulation / Q000187:drug effects / Q000276:immunology*; D023061:Gene Order; D008214:Lymphocytes / Q000187:drug effects; D008969:Molecular Sequence Data; D010473:Perciformes / Q000196:embryology / Q000235:genetics* / Q000276:immunology*; D016415:Sequence Alignment
chemical_list: D000276:Adjuvants, Immunologic; D016827:CD8 Antigens; C431698:CD8alpha antigen; C477867:CD8beta antigen