Abstract
Preincubation of rabbit neutrophils with the synthetic chemotactic factor f-Met-Leu-Phe has been found to diminish the ability of these cells to mobilize calcium upon subsequent stimulation by f-Met-Leu-Phe or by leukotriene B 4. The preexposure of the neutrophils to leukotriene B 4 on the other hand results in a diminished subsequent response to itself but an unaltered response to f-Met-Leu-Phe. These results demonstrate that deactivation can be observed at the level of calcium mobilization, strengthen the postulated second messenger role of calcium in neutrophils and imply that neutrophil activation by chemotactic factors can bypass the arachidonic acid metabolic pathway.
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