title: Characterisation and expression analysis of the rainbow trout (Oncorhynchus mykiss) homologue of the human dendritic cell marker CD208/lysosomal associated membrane protein 3.
abstract: LAMP3/CD208 is a member of the lysosomal-associated membrane protein family and is used as a putative marker for mature dendritic cells (DCs) in humans since it is upregulated upon DC activation and maturation. This paper reports the cloning and sequencing of LAMP3 in rainbow trout. The predicted trout LAMP3 shares the characteristic features of LAMP family members such as a C-terminal lysosomal sorting motif (G-Y-D-R-I) in the short C-terminal cytoplasmic tail, typical for lysosomal targeting, four potential N-linked glycosylation sites (NXS/T), four conserved cysteines in the membrane-proximal domain and the luminal domain divided by a serine/proline-rich region. Expression studies revealed that trout LAMP3, like chicken LAMP3, was constitutively expressed in a wide range of lymphoid tissues, at highest levels in the head kidney, liver and spleen, respectively. LAMP3 was also constitutively expressed in trout head kidney macrophages and RTS11 cells and the expression was shown to be induced in vivo after infection with viral and bacterial pathogens and in cultured macrophages after modulation with microbial mimics (LPS and PolyIC). Thus, it is clear that if LAMP3 is expressed by trout DCs it is not exclusively expressed by them. However, the marker is valuable to further study antigen presentation in fish and to complement already known DC markers.
authors.affiliation: Scottish Fish Immunology Research Centre, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK.
authors.forename: Petronella
authors.initials: P
authors.lastname: Johansson
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Corripio-Miyar
authors.forename: Tiehui
authors.initials: T
authors.lastname: Wang
authors.forename: Bertrand
authors.initials: B
authors.lastname: Collet
authors.forename: Chris J
authors.initials: CJ
authors.lastname: Secombes
authors.forename: Jun
authors.initials: J
authors.lastname: Zou
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003713:Dendritic Cells / Q000276:immunology; D029941:Fish Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005802:Genes, MHC Class II; D060226:Head Kidney / Q000276:immunology; D006801:Humans; D008070:Lipopolysaccharides / Q000378:metabolism; D059666:Lysosomal-Associated Membrane Protein 3 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051907:Lysosomal Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008264:Macrophages / Q000276:immunology; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017686:Oncorhynchus mykiss / Q000235:genetics* / Q000276:immunology* / Q000378:metabolism; D010802:Phylogeny; D011070:Poly I-C / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D029941:Fish Proteins; C114233:LAMP3 protein, human; D008070:Lipopolysaccharides; D059666:Lysosomal-Associated Membrane Protein 3; D051907:Lysosomal Membrane Proteins; D009363:Neoplasm Proteins; D011070:Poly I-C