Abstract
Lysosomal cationic proteins which release histamine from rat peritoneal mast cells were prepared from circulating as well as peritoneal leukocytes of rabbits. The release of histamine by cationic proteins and by compound 48 80 was compared as a function of temperature, pH and concentration. Cationic protein-mediated histamine release appears to be a non-cytotoxic energy requiring process similar to compound 48 80 - mediated release . It was inhibited by iodoacetate, n-ethylmaleimide, 2,4-dinitrophenol, malonate, oxamate, glutamate and slightly inhibited by 2-deoxyglucose. Pharmacologic inhibition of release by isoproterenol, aminophylline, dibutyryl cyclic AMP and prednisone was also demonstrated.
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