Abstract
Supernatants of cultured human mononuclear cells contain factors that induce histamine release from basophils. Some of the histamine-releasing factors present are IgE-independent, but an IgE-dependent form has also been described. The IgE that does respond to the IgE-dependent histamine-releasing factor was defined as IgE+. This study was conducted to analyze the contribution of chemokines, such as monocyte chemotactic protein-1 (IgE-independent), to improve the detection of IgE-dependent histamine-releasing factor. Supernatants were prepared from mononuclear cells of three subjects. Monocyte chemotactic protein-1 content and histamine-releasing activity (HRA) were measured. Depletion of chemokine activity was carried out with heparin-Sepharose (Pharmacia, Uppasala, Sweden). Replacing IgE- on basophils with IgE+ serum decreased the correlation between monocyte chemotactic protein-1 and histamine release (rho = 0.80, n = 280 vs p = 0.12, n = 18; p for difference between p values; < 0.05). After depletion of chemokines in three supernatants derived from mononuclear cells, IgE-dependent HRA was still present. We conclude that in supernatants derived from mononuclear cells, the IgE-independent HRA masks the IgE-dependent HRA. The l...Continue Reading
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