Phorbol 12-myristate 13-acetate activates rabbit neutrophils without an apparent rise in the level of intracellular free calcium

Biochemical and Biophysical Research Communications
R I Sha'afiM B Feinstein

Abstract

The addition of low concentrations of phorbol 12-myristate 13-acetate to rabbit neutrophils induces cell aggregation, degranulation, increased oxygen consumption and an increase in the amount of actin associated with the cytoskeleton without a rise in the level of intracellular free calcium as measured using the fluorescent probe quin-2. The ability of phorbol 12-myristate 13-acetate to initiate neutrophil responses similar to those produced by the chemotactic factor without causing a rise in the level of intracellular free calcium suggests two possibilities; that there is a second messenger in addition to calcium or that it activates the cells at a point distal to calcium mobilization. The possible role of diacylglycerol in neutrophil activation is discussed.

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