A protein of 31.5 kDa belonging to the NADPH oxidase of neutrophils was phosphorylated following stimulation of the cells with phorbol myristate acetate. The same protein was phosphorylated in vitro in the presence of cytosol and of Ca2+ and phosphatidylserine. The phosphorylation in vitro of the 31.5 kDa protein was increased by phorbol myristate acetate and was inhibited by trifluoperazine. The data are compatible with an involvement of protein kinase C in the activation of NADPH oxidase.
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Papini et al. (1985) studied this question.
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