title: Identification and functional characterization of a human sTRAIL homolog, CasTRAIL, in an invertebrate oyster Crassostrea ariakensis.
abstract: Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL/Apo2L) is one of the tumor necrosis factor (TNF) superfamily members, participating in many biological processes including apoptosis and immune responses. In present study, a novel human soluble TRAIL (sTRAIL) homolog, CasTRAIL was identified from the oyster, Crassostrea ariakensis. CasTRAIL has a 99% and 98% similarity to human sTRAIL over the cDNA sequence and the amino acid sequence, respectively. It mostly distributes in tissues of the oyster defense system and was mainly localized at cell membrane, and has no cytotoxicity to normal hemocytes of oyster. The phosphorylation state of MAP kinases revealed that CasTRAIL induced a rapid increase in the phospho-ERK and phospho-p38 levels, which indicated that the MAPK pathway was involved in CasTRAIL-mediated signaling. In addition, CasTRAIL also showed an ability of anti-RLO infection which might be through the p38-MAPK activation pathway. Present studies provide an understanding and insight of the biological functions of CasTRAIL.
authors.affiliation: Laboratory of Marine Life Science and Technology, College of Animal Sciences, Zhejiang University, No. 268 Kaixuan Road, Hangzhou, Zhejiang, China.
authors.forename: Shoubao
authors.initials: S
authors.lastname: Yang
authors.forename: Xinzhong
authors.initials: X
authors.lastname: Wu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002478:Cells, Cultured; D003001:Cloning, Molecular; D049896:Crassostrea / Q000235:genetics / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D006434:Hemocytes / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007113:Immunity, Innate / Q000235:genetics; D020935:MAP Kinase Signaling System / Q000276:immunology; D008565:Membrane Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D008969:Molecular Sequence Data; D012281:Rickettsia / Q000276:immunology* / Q000472:pathogenicity; D012282:Rickettsia Infections / Q000276:immunology*; D017386:Sequence Homology, Amino Acid; D053221:TNF-Related Apoptosis-Inducing Ligand / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D008565:Membrane Proteins; D053221:TNF-Related Apoptosis-Inducing Ligand; D048051:p38 Mitogen-Activated Protein Kinases