title: Natural killer and natural killer-like cell activity of peripheral blood and intrathyroidal mononuclear cells from patients with Graves' disease.
abstract: This study was undertaken to investigate the natural killer (NK) and natural killer-like (NK-like) cell cytotoxic activity toward autologous thyrocytes of peripheral blood mononuclear cells (PB-MNC) and thyroid gland mononuclear cells (TG-MNC) from previously hyperthyroid patients with Graves' disease, and the effects of recombinant interleukin-2 on such cytotoxic activity. The average cytotoxicities of PB-MNC from Graves' patients toward K562 cells (NK-sensitive cells), Raji cells (NK-resistant cells), and autologous thyrocytes were 23.9 +/- 10.8 (+/- SD) lytic units (LU), 7.4 +/- 3.8 LU, and 11.7 +/- 4.4 LU, respectively. There were no differences in the NK and NK-like cell activity of PB-MNC between Graves' disease patients and normal subjects. In contrast to PB-MNC from patients with Graves' disease, NK and NK-like cell activity was markedly decreased in TG-MNC (NK cell activity, 2.1 +/- 2.3 LU; NK-like cell activity, 1.5 +/- 1.5 LU). TG-MNC from Graves' patients had no cytotoxic activity against autologous thyrocytes. Using the monoclonal anti-Leu 7 and anti-CD16 antibodies and a two-color immunofluorescence method, the NK cell subsets were examined in PB-MNC and TG-MNC from Graves' patients. The percentage of CD16+ cells was significantly decreased in TG-MNC compared to PB-MNC, whereas there was no significant difference in the percentage of Leu 7+ cells between PB-MNC and TG-MNC. Incubation of TG-MNC with medium only did not increase the NK and NK-like cell activity of these cells. Furthermore, incubation of autologous PB-MNC with supernatants of minced thyroid tissues did not alter their NK and NK-like cell activity. The decreased NK and NK-like cell activity of TG-MNC was augmented when these cells were incubated with recombinant interleukin-2. These results suggest that the reduction of NK cell activity in TG-MNC may allow perpetuation of B-cell activation and lead to excessive production of autoantibody in thyroid tissue.
authors.affiliation: First Department of Internal Medicine, Nagasaki University School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tezuka
authors.forename: K
authors.initials: K
authors.lastname: Eguchi
authors.forename: T
authors.initials: T
authors.lastname: Fukuda
authors.forename: T
authors.initials: T
authors.lastname: Otsubo
authors.forename: Y
authors.initials: Y
authors.lastname: Kawabe
authors.forename: Y
authors.initials: Y
authors.lastname: Ueki
authors.forename: M
authors.initials: M
authors.lastname: Matsunaga
authors.forename: C
authors.initials: C
authors.lastname: Shimomura
authors.forename: H
authors.initials: H
authors.lastname: Nakao
authors.forename: N
authors.initials: N
authors.lastname: Ishikawa
mesh_terms: D000293:Adolescent; D000328:Adult; D003602:Cytotoxicity, Immunologic; D005260:Female; D006111:Graves Disease / Q000097:blood / Q000276:immunology*; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000276:immunology*; D007958:Leukocyte Count; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008297:Male; D013961:Thyroid Gland / Q000166:cytology*
chemical_list: D007376:Interleukin-2