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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inhibition by abruquinone A of phosphoinositide-specific phospholipase C activation in rat neutrophils.

In rat neutrophils, formyl-Met-Leu-Phe (fMLP)-induced phosphate formation was inhibited by abruquinone A (IC50 value about 32.7 +/- 6.4 microM) as well as by a putative phospholipase C inhibitor, [6-[[17 beta-3-methoxyestra-1,3,5(10)-trien-17-yl]amino]hexyl]-1H-pyrrole- 2,5-dione (U73122) (IC50 value about 11.3 +/- 1.2 microM). The reduction in inositol phosphate levels appeared to reflect inhibition of phospholipase C activity because the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) catalyzed by a soluble fraction from neutrophils was also inhibited by abruquinone A (IC50 value about 31.4 +/- 5.6 microM) over the same range of concentrations. Although abruquinone A alone induced Ca2+ and Mn2+ influx into neutrophils in Ca(2+)-containing medium, abruquinone A, like U73122, inhibited Ca2+ release (IC50 value about 23.5 +/- 0.5 microM) from internal stores in Ca(2+)-free medium. These results indicate that abruquinone A inhibits the activity of phosphoinositide-specific phospholipase C in neutrophils.[1]


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