title: Natural and concanavalin A-induced cytotoxic activity towards continuously growing B lymphocytes derived from patients with cutaneous T-cell lymphoma.
abstract: Continuously growing T- and B-cell lines were derived from peripheral blood, affected skin, and lymph nodes of patients with mycosis fungoides (MF) and Sézary syndrome (SS). Two lymphoblastoid cell lines (MF-13 and SS-2) were Epstein-Barr virus (EBV)-transformed B cells evaluated by surface immunoglobulin, lack of E-rosette formation, positive EBV nuclear antibody test, and secretion of IgM antibody in a plaque-forming cell assay. Analysis of the natural-killer-cell activity using peripheral blood lymphocytes from patients with MF and healthy control persons towards MF-13 and SS-2 target cells suggested resistance to lysis even in tests supplemented with 1,000 IU/ml human gamma-interferon. However, the cell lines were not per se completely resistant to lysis because lymphocytes from control persons showed significant cytotoxicity in an 18-h assay supplemented with 2 micrograms/ml concanavalin A.
mesh_terms: D000328:Adult; D000368:Aged; D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D003208:Concanavalin A / Q000276:immunology*; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009182:Mycosis Fungoides / Q000276:immunology*; D012751:Sezary Syndrome / Q000276:immunology*; D012878:Skin Neoplasms / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D003208:Concanavalin A; D007371:Interferon-gamma