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,
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Departments of
*
Medicine and
Biochemistry and Molecular Biology, University of Louisville, Louisville, KY 40202; and
Veterans Affairs Medical Center, Louisville, KY 40206
Respiratory burst activity and phosphorylation of an NADPH oxidase component, p47phox, during neutrophil stimulation are mediated by phosphatidylinositol 3-kinase (PI-3K) activation. Products of PI-3K activate several kinases, including the serine/threonine kinase Akt. The present study examined the ability of Akt to regulate neutrophil respiratory burst activity and to interact with and phosphorylate p47phox. Inhibition of Akt activity in human neutrophils by an inhibitory peptide significantly attenuated fMLP-stimulated, but not PMA-stimulated, superoxide release. Akt inhibitory peptide also inhibited hydrogen peroxide generation stimulated by bacterial phagocytosis. A direct interaction between p47phox and Akt was shown by the ability of GST-p47phox to precipitate recombinant Akt and to precipitate Akt from neutrophil lysates. Active recombinant Akt phosphorylated recombinant p47phox in vitro, as shown by 32P incorporation, by a mobility shift change detected by two-dimensional gel electrophoresis, and by immunoblotting with phospho-Akt substrate Ab. Mutation analysis indicated that 2 aa residues, Ser304 and Ser328, were phosphorylated by Akt. Inhibition of Akt activity also inhibited fMLP-stimulated neutrophil chemotaxis. We propose that Akt mediates PI-3K-dependent p47phox phosphorylation, which contributes to respiratory burst activity in human neutrophils.
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