Abstract
In anaphylactic cutaneous lesions induced by DNP-ascaris extract in the guinea-pig, the time-course of delayed tissue eosinophilia was found to parallel that of the macrophage reaction, reaching its peak in 24 h. Macrophages could be differentiated from lymphocytes by the numerous lysosomal granules which stained for acid phosphatase. Extracts from such skin lesions contained a delayed eosinophil chemotactic factor and two different macrophage chemotactic factors. Most of the delayed eosinophil chemotactic factor was separated from the two macrophage chemotactic factors by gel filtration on Sephadex G-100 and Sephadex G-200 in that order. The eosinophil chemotactic factor after re-chromatography on Sephadex G-I99 showed no or little chemotactic activity for macrophages.
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