Mechanisms of Passive Sensitization

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Abstract
E myeloma protein was injected intracutaneously into monkey skin to produce passive sensitization. The sensitized and nonsensitized sites were challenged with 125I-labeled purified anti-IgE. The results of autoradiography of the tissues indicated that IgE was present on mast cells. When the E myeloma protein was injected intravenously into monkeys, the antigen was detected on mast cells in small intestine, bronchi and omentum but not on other tissue cells. The E myeloma protein was detected on basophil granulocytes in the blood, but not on other leukocytes. Evidence was obtained that both mast cells and basophil granulocytes contain monkey IgE, and that E myeloma protein combines with the same cells upon passive sensitization. IgG was detected on neutrophil granulocytes, monocytes and macrophages but not on mast cells.

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