Abstract
Bridging of cell-bound IgE antibody molecules on colony-stimulating factor-dependent mouse mast cell line (PT-18) cells by multivalent antigen induces phospholipid methylation, a transient rise in intracellular cAMP, intracellular mobilization and uptake of Ca2+, and formation of diacylglycerol followed by histamine release. Exposure of the sensitized cells to antigen also induces a substantial increase in protein kinase C activity in the plasma membrane, which is accompanied by a slight decrease in the enzyme in cytosol. Protein kinase C activity in the membrane fraction reached maximum within 30 sec after antigen challenge and then gradually declined. The increase of the enzyme activity in the membrane could not be explained by a shift of the enzyme from cytosol, and it suggested that bridging of IgE-receptor may induce a modulation of existing enzyme to a state of higher catalytic activity. Phorbol 12-myristate 13-acetate also induced a rapid but persistent increase in protein kinase C activity in the membrane fraction of mast cells. However, the increase in the enzyme activity in the membrane was accompanied by a marked decrease in the enzyme in cytosol.
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