Department of Pulmonary Diseases, G03.550, University Medical Centre Utrecht, The Netherlands
Correspondence: Dr. Paul J. Coffer, Dept. Pulmonary Diseases, G03.550, University Medical Centre, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. E-mail: P.Coffer{at}hli.azu.nl
Tyrosine phosphorylation is thought to be critical in the regulation of neutrophil functioning, and members of the Src family of tyrosine kinases have recently been shown to be regulated in activated granulocytes. We have used a specific pharmacological inhibitor of Src kinases, pyrazolpyrimidine 1 (PP1), to evaluate the role of Src kinases in cytokine/chemoattractant-induced regulation of neutrophil function. PP1 inhibits PKB phosphorylation but not STAT5 phosphorylation or the activation of MAP kinases by fMLP or GM-CSF. Pretreatment of neutrophils with PP1 and with the PI3K inhibitor LY294002 resulted in a strong inhibition of fMLP-induced superoxide production and cytokine-mediated survival but not fMLP-induced migration. It is interesting that the kinetics of inhibition of actin polymerization and the respiratory burst are very similar. Although initiation of both processes was not affected, sustained activation was inhibited by PP1. Taken together, our results demonstrate a critical role for Src kinases in regulating neutrophil cytotoxic-effector functioning through PI3K-PKB.
Key Words: signal transduction • protein kinase • cellular activation
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