The Release of Histamine from Rat Mast Cells by Chymotrypsin

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Abstract
The release of histamine from rat peritoneal mast cells induced by α-chymotrypsin and that induced by antigen have characteristics in common. The kinetics of histamine release initiated by the two agents are similar. Both α-chymotrypsin and antigen release histamine in the absence of extracellular calcium, phosphatidyl serine enhances the release, and disodium cromoglycate inhibits both reactions. In contrast, extracellular α-chymotrypsin does not induce histamine release from cells isolated from fragments of human lung, human basophils, histamine-containing cells lavaged from the bronchial lumen of the rhesus monkey, fragments of human lung and fragments of guinea pig lung.

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