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Abstract
Human lung slices passively sensitized with allergic serum released histamine when incubated with specific antigen and anti-IgE but anti-IgG had no effect. Sodium cromoglycate (SCG) inhibited antigen induced histamine release but the dose-response curve was bell-shaped. Inhibition of anti-IgE induced release was linearly related to dose, whereas that induced by anti-IgG was potentiated by increasing doses of SCG. After sensitization with allergic serum in which IgE had been inactivated by heating, specific antigen released little or no histamine but this was potentiated by SCG. It is concluded that SCG inhibits IgE mediated but potentiates IgG mediated allregic reactions thus explaining its characteristic dose-response curve in vitro .
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