title: Regulatory activity of neoplastic T cells in Sezary syndrome on in vitro immunoglobulin production.
abstract: Functional activities and surface markers of the neoplastic T cells of three patients with Sézary syndrome were studied and compared with the functional activities of OKT4+ and OKT8+ T-cell subsets from healthy donors. The neoplastic T cells of the patients had the following marker phenotype: OKT1+3+4+6-8-11+17+I1-M1-3A1-. In contrast to healthy donor OKT4+ T cells, none of the neoplastic T cells had significant helper activity on pokeweed-mitogen-driven Ig synthesis. In one patient the neoplastic T cells suppressed pokeweed-mitogen-driven Ig synthesis. The suppression by the patient cells did not require the presence of radiosensitive OKT4+ suppressor-inducer cells in the culture. It is concluded that OKT4+8-3A1- neoplastic T cells from Sézary-syndrome patients lacking helper activity are more common than previously thought and that in some cases the OKT4+8-3A1- Sézary cells can mediate suppressor activity.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000917:Antibody Formation; D000954:Antigens, Surface / Q000032:analysis; D006801:Humans; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D012751:Sezary Syndrome / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface