title: Comparative studies of CD3- and CD3+ CD56+ cells: examination of morphology, functions, T cell receptor rearrangement, and pore-forming protein expression.
abstract: Both CD3- and CD3+ CD56+ effector cells can mediate non-MHC-restricted lysis in the absence of activation. Previous studies have shown that both of these subsets can be augmented with IL-2. In the present study, we have examined further the phenotypic markers expressed on these cells as well as the functional capacities of these subsets, including LAK activity, cytokine expression, and pore-forming protein (PFP) production. In addition, these populations were analyzed for clonality by Southern blot analysis of the T cell receptor beta chain gene constant region. The CD3-, CD56+ and CD3+, CD56+ lymphocytes were quite similar in their phenotypic markers, although the CD3+, CD56+ lymphocytes lacked high levels of IL-2 receptor beta chain and did not express CD16. The CD3+, CD56+ lymphocytes mediated non-MHC-restricted lysis, but failed to express LAK activity or be induced by IL-2 to secrete IFN gamma, a characteristic of the CD3-, CD56+ lymphocytes. The T cell receptor beta chain gene pattern of the CD3+, CD56+ lymphocytes was characteristic of a polyclonal cell population. Of interest, both populations of cells appeared morphologically to be large granular lymphocytes that contain PFP in their cytoplasmic granules. Therefore these CD56+ subsets provide a new model to study several questions related to non-MHC-restricted target cell lysis, including the identification of novel receptors involved in target cell recognition and/or triggering as well as the biochemical pathways implicated in cellular lysis.
authors.affiliation: Laboratory of Experimental Immunology, National Cancer Institute, Frederick, Maryland 21702-1201.
authors.forename: J R
authors.initials: JR
authors.lastname: Ortaldo
authors.forename: R T
authors.initials: RT
authors.lastname: Winkler-Pickett
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: H A
authors.initials: HA
authors.lastname: Young
mesh_terms: D015703:Antigens, CD / Q000032:analysis*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D015139:Blotting, Southern; D017252:CD3 Complex; D019002:CD56 Antigen; D002469:Cell Separation; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis*; D003602:Cytotoxicity, Immunologic; D005434:Flow Cytometry; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D006801:Humans; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000096:biosynthesis; D007376:Interleukin-2 / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000276:immunology; D016131:Lymphocyte Subsets / Q000166:cytology* / Q000502:physiology; D008565:Membrane Proteins / Q000096:biosynthesis*; D011948:Receptors, Antigen, T-Cell / Q000032:analysis* / Q000235:genetics*; D016693:Receptors, Antigen, T-Cell, alpha-beta; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D019002:CD56 Antigen; D016207:Cytokines; D007376:Interleukin-2; D008565:Membrane Proteins; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D007371:Interferon-gamma