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Using a monoclonal anti-human IgE receptor (Fc epsilon R) antibody, the percentage of Fc epsilon R(+) cells among peripheral blood lymphocytes in children with or without allergic disorders was determined. The percentage of Fc epsilon R(+) cells in 63 nonallergic children was 4.3 +/- 1.5%, which did not vary with age and was equal to that of adults (4.2 +/- 1.2%). Allergic younger children (0-2 yr) showed a significantly higher percentage of Fc epsilon R(+) cells (7.7 +/- 3.0%) than nonallergic younger children (0-2 yr) (4.0 +/- 1.3%, p less than 0.001). Similarly, in allergic younger children, serum IgE levels (geometric mean = 58.9 IU/ml) were also significantly higher than those of nonallergic younger children (geometric mean = 2.0 IU/ml) (p less than 0.01). A positive correlation between the percentages of Fc epsilon R(+) cells and serum IgE levels was observed (Spearman rank = 0.88, p less than 0.01] in eight allergic younger children (0-2 yr) with serum IgE levels higher than 100 IU/ml. The increase in the percentage of Fc epsilon R(+) cells in allergic younger children (0-2 yr) was not a secondary phenomenon caused by serum IgE because serum IgE levels in these children were much lower than the concentration at which IgE enhance Fc epsilon R expression on lymphocytes. In conclusion, Fc epsilon R(+) lymphocytes may play a regulatory role in IgE synthesis in allergic younger children (0-2 yr).

IgE Receptor-Bearing Lymphocytes in Allergic and Nonallergic Children