title: Preferential combination between the light and heavy chain isotypes of fish immunoglobulins.
abstract: Immunoglobulin light chain (IgL) is necessary for the assembly of an Ig molecule, which plays important roles in the immune response. IgL genes were identified in various teleost species, but the basic functions of different IgL isotypes and the preferential combination between IgL and IgH (Ig heavy chain) isotypes remain unclear. In the current study, by EST database searching and cDNA cloning in rainbow trout, 8 IgL sequences were obtained, which could be classified into the IgLκF, IgLκG, IgLσ and IgLλ isotypes, respectively. Trout IgL isotypes were highly expressed in the immune-related tissues, and participated in the immune responses in spleen and gut by stimulation with LPS and poly (I:C). The results of FACS and LC-MS/MS indicated that the IgLκG and IgLσ isotypes preferentially bonded with the heavy chains of IgM and IgT, respectively, in trout B cells and serum. In addition, the genomic organization of trout IgL isotypes and the utilization of recombination signal sequences were studied.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Nu
authors.initials: N
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China.
authors.forename: Xu-Jie
authors.initials: XJ
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Yu-Long
authors.initials: YL
authors.lastname: Song
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
authors.forename: Dan-Dan
authors.initials: DD
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
authors.forename: Xiao-Qin
authors.initials: XQ
authors.lastname: Xia
authors.affiliation: Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors.forename: J Oriol
authors.initials: JO
authors.lastname: Sunyer
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. Electronic address: yzhang@ihb.ac.cn.
authors.forename: Yong-An
authors.initials: YA
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D019281:Dimerization; D029941:Fish Proteins / Q000235:genetics* / Q000378:metabolism; D005399:Fishes / Q000276:immunology*; D007143:Immunoglobulin Heavy Chains / Q000235:genetics / Q000378:metabolism*; D007132:Immunoglobulin Isotypes; D007147:Immunoglobulin Light Chains / Q000235:genetics / Q000378:metabolism*; D007422:Intestines / Q000276:immunology*; D008070:Lipopolysaccharides / Q000276:immunology; D011070:Poly I-C / Q000276:immunology; D011485:Protein Binding; D013154:Spleen / Q000276:immunology*; D014337:Trout
chemical_list: D029941:Fish Proteins; D007143:Immunoglobulin Heavy Chains; D007132:Immunoglobulin Isotypes; D007147:Immunoglobulin Light Chains; D008070:Lipopolysaccharides; D011070:Poly I-C
keywords: Heavy chain; IgM; IgT; Light chain subisotype; Preferential combination; Rainbow trout