Plasma-membrane location of phosphatidylinositol hydrolysis in rabbit neutrophils stimulated with formylmethionyl-leucylphenylalanine (original) (raw)

Abstract

Rabbit peritoneal neutrophils, disrupted by sonication, were separated into three subcellular fractions by sucrose-step-gradient centrifugation and these were analysed with respect to biochemical markers. They comprised a high-speed supernatant containing the cytosol, a light particulate fraction enriched in Golgi and plasma membranes and a heavy particulate fraction enriched in granules and nuclei. The light particulate fraction was further separated into its components, which were identified as Golgi membranes (galactosyltransferase activity) and plasma membranes ((radioactivity derived from labelling intact cells with [125I]di-iodosulphanilic acid diazonium salt and [3H]formylmethionyl-leucylphenylalanine ([3H]fMet-Leu-Phe) binding)). In cells prelabelled with [3H]glycerol, the hydrolysis of phosphatidylinositol due to cell stimulation with fMet-Leu-Phe (10 nM) was shown to occur in the light particulate fraction. The [32P]Pi-labelling of phosphatidate, which is an early consequence of phosphatidylinositol hydrolysis, also occurred in this fraction. Analytical sucrose-gradient centrifugation of the light particulate fraction showed that the stimulated increment in [32P]phosphatidate (and thus by implication the initial phosphatidylinositol breakdown) was localized in the plasma membrane.

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Selected References

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