title: Peripheral K cells in Graves' disease and Hashimoto's thyroiditis in relation to circulating immune complexes.
abstract: A plaque assay was employed to quantify the number of peripheral K cells in autoimmune thyroid diseases. The percentages of peripheral K cells determined were 3.1 +/- 2.2% and 3.3 +/- 1.3% (mean +/- SD) in forty-one patients with Graves' disease and twenty-two patients with Hashimoto's thyroiditis, respectively, which were significantly lower than 5.3 +/- 2.5% in 22 normal subjects. Circulating immune complexes (ICs) were measured by three different methods. The positivity of these ICs was investigated in relation to the level of peripheral K cells. The percentage of peripheral K cells in the patients positive for ICs was found to be lower than that in the patients negative for any ICs. Moreover, it was observed that the number of detectable K cells from a normal subject was significantly decreased by incubating the K cells with sera of patients positive for ICs. These results suggest that the decrease of peripheral K cells in the patients with autoimmune thyroid diseases may be due to saturation of K cell Fc receptors by binding ICs.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000936:Antigen-Antibody Complex / Q000032:analysis*; D002648:Child; D005260:Female; D006111:Graves Disease / Q000276:immunology*; D006462:Hemolytic Plaque Technique; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D013967:Thyroiditis, Autoimmune / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex