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• W2034777633 abstract "The mechanism of inhibition of neutrophil phagocytic functions by cAMP-elevating agents has not yet been clarified. In the present work, the effects of adenylate cyclase agonists on protein phosphorylation in the formylmethionyl-leucyl-phenylalanine (fMLP)-stimulated human neutrophils were studied. Before stimulation, 32Pi-labelled cells were incubated with adenosine deaminase to remove the endogenously produced adenosine, an adenylate cyclase agonist itself. A protein of about 52,000 molecular weight was rapidly and transiently phosphorylated when neutrophils were stimulated with fMLP in the presence of isoproterenol, prostaglandin E1, histamine or 2-chloroadenosine. This phosphorylation was blocked by the antagonists of the receptors for the above-listed agents. No phosphorylation of the 52,000 molecular weight protein could be observed if either fMLP or the cAMP-elevating agent were applied alone. A calcium ionophore A23187 and dibutyryl-cAMP could replace fMLP and a cAMP-elevating agent, respectively. Phosphorylation of the 52,000 molecular weight protein was also demonstrated in cell lysates in the presence of cAMP, and in membrane preparations in the presence of the catalytic subunit of cAMP-dependent protein kinase. These data suggest that phosphorylation of the 52,000 molecular weight protein in intact cells is dependent on the cross-talk between the fMLP- and the cAMP-signalling pathways, and may thus be involved in the cAMP-regulatory mechanism." @default.
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• W2034777633 date "1992-05-01" @default.
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• W2034777633 title "Cross-talk between cAMP and formylmet-leu-phe in human neutrophils: Phosphorylation of a 52,000 molecular weight protein" @default.
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• W2034777633 doi "https://doi.org/10.1016/0898-6568(92)90064-f" @default.
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