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J. Biol. Chem., Vol. 261, Issue 25, 11558-11562, Sep, 1986

Direct evidence for involvement of a guanine nucleotide-binding protein in chemotactic peptide-stimulated formation of inositol bisphosphate and trisphosphate in differentiated human leukemic (HL-60) cells. Reconstitution with Gi or Go of the plasma membranes ADP-ribosylated by pertussis toxin

A Kikuchi, O Kozawa, K Kaibuchi, T Katada, M Ui and Y Takai

fMet-Leu-Phe (fMLP) stimulated the formation of inositol bis- and trisphosphate in the [3H]inositol-labeled plasma membranes from the human leukemic (HL-60) cells differentiated to neutrophil-like cells by dibutyryl cyclic AMP. The stimulatory effect of fMLP was completely dependent on the simultaneous presence of GTP and Ca2+. The fMLP- stimulated formation of the phosphorylated inositols was markedly reduced by the prior ADP-ribosylation of the membranes with pertussis toxin. This toxin ADP-ribosylated a Mr approximately 40,000 protein, presumably the alpha subunit of Gi and/or Go, in the membranes. Reconstitution of the membranes ADP-ribosylated by pertussis toxin with Gi or Go purified from rat brain restored the fMLP-stimulated formation of the phosphorylated inositols. The efficiency of the rat brain Gi and Go in this capacity was roughly equal. The rat brain Gi or Go ADP- ribosylated beforehand by pertussis toxin was inactive in this reconstitution. These results indicate that both rat brain Gi and Go have the potency to couple functionally the fMLP receptor to the phospholipase C-mediated polyphosphoinositide hydrolysis and suggest that Gi or Go may be involved in the mechanism of signal transduction from the fMLP receptor to this reaction in the differentiated HL-60 cells.
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