title: A C-type lectin from the tunicate, Styela plicata, that modulates cellular activity.
abstract: Previous studies have identified proteins from tunicates (invertebrate members of the Phylum Chordata) that have physicochemical and functional properties similar to those of the inflammatory cytokine, interleukin 1 (IL-1). Here we characterize one of those proteins from the tunicate, Styela plicata, that can stimulate tunicate and mammalian cell proliferation, activate phagocytosis, increase interleukin 2 (IL-2) secretion by mammalian peripheral blood mononuclear cells and enhance IL-2 receptor (IL-2R) expression by mammalian EL-4.IL-2 cells. Partial amino acid sequence data showed that the S. plicata protein resembles three C-type lectins (TC14, TC14-1 and TC14-2) from a closely related tunicate species, Polyandrocarpa misakiensis. Its similarity to carbohydrate recognition domains (CRDs) from P. misakiensis lectins suggests that the S. plicata protein modulates the activities of mammalian immunocompetent cells by interacting with carbohydrate moieties of glycosylated cell surface receptors.
authors.affiliation: Department of Biological Sciences, Macquarie University, 2109, North Ryde, NSW, Australia. snair@gwu.edu
authors.forename: S V
authors.initials: SV
authors.lastname: Nair
authors.forename: M
authors.initials: M
authors.lastname: Burandt
authors.forename: A
authors.initials: A
authors.lastname: Hutchinson
authors.forename: R L
authors.initials: RL
authors.lastname: Raison
authors.forename: D A
authors.initials: DA
authors.lastname: Raftos
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D006434:Hemocytes / Q000378:metabolism; D007376:Interleukin-2 / Q000235:genetics / Q000378:metabolism; D037102:Lectins / Q000302:isolation & purification / Q000494:pharmacology*; D037181:Lectins, C-Type; D051379:Mice; D008934:Mitogens / Q000378:metabolism / Q000494:pharmacology; D008969:Molecular Sequence Data; D010587:Phagocytosis / Q000187:drug effects; D015375:Receptors, Interleukin-2 / Q000235:genetics / Q000378:metabolism; D014561:Urochordata / Q000378:metabolism*
chemical_list: D001798:Blood Proteins; D007376:Interleukin-2; D037102:Lectins; D037181:Lectins, C-Type; D008934:Mitogens; D015375:Receptors, Interleukin-2