title: CD56 expression in feline lymphoid cells.
abstract: The neural-cell adhesion molecule (N-CAM) consists of three major types of polypeptides (180, 140, and 120 kDa) whose predominant differences exist within the transmembrane and cytoplasmic domains. In this study, we generated a monoclonal antibody, termed SZK1, reactive to feline CD56 (fCD56) molecules (140 kDa form of N-CAM) expressed by the baculovirus expression system and investigated fCD56 expression in feline lymphoid cells. In flow cytometric analysis, SZK1 was reactive to a feline T-lymphoblastoid cell line MYA-1. Further, SZK1 was reactive to a very small population (1.1-1.7%) of freshly isolated peripheral blood lymphocytes (PBLs) of three specific pathogen-free cats, and the reactivity was increased by culturing of PBLs in the presence of interleukin-2 following concanavalin A-stimulation (>10%). In immunoblotting analysis, SZK1 detected an approximately 160 kDa antigen from MYA-1 cells, while from RNA of the cells reverse transcription-polymerase chain reaction amplified the fragment resembling 140 kDa form of N-CAM. These finding suggest that fCD56 has similar characteristics with human CD56.
authors.affiliation: Department of Veterinary Microbiology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shimojima
authors.forename: Yorihiro
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Takayuki
authors.initials: T
authors.lastname: Miyazawa
authors.forename: Kentaro
authors.initials: K
authors.lastname: Kato
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Tohya
authors.forename: Hiroomi
authors.initials: H
authors.lastname: Akashi
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D019002:CD56 Antigen / Q000378:metabolism*; D002415:Cats / Q000378:metabolism*; D002460:Cell Line; D003208:Concanavalin A / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D007376:Interleukin-2 / Q000494:pharmacology; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*; D013047:Specific Pathogen-Free Organisms
chemical_list: D000911:Antibodies, Monoclonal; D019002:CD56 Antigen; D007376:Interleukin-2; D003208:Concanavalin A