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. 1993 May 15;292(Pt 1):183–187. doi: 10.1042/bj2920183

Up-regulation of the amount of Gi alpha 2 associated with the plasma membrane in human neutrophils stimulated by granulocyte-macrophage colony-stimulating factor.

M Durstin 1, S R McColl 1, J Gomez-Cambronero 1, P H Naccache 1, R I Sha'afi 1
PMCID: PMC1134286  PMID: 8503845

Abstract

Preincubation of human neutrophils with the human cytokine granulocyte-macrophage colony-stimulating factor (GM-CSF) results in an increase in the amount of alpha-subunit of Gi2 (Gi alpha 2) associated with the plasma membrane and a corresponding decrease in the amount associated with the granule fractions. Similar results are obtained with interleukin-8. GM-CSF has no effect on the distribution of Gi alpha 3. The effect of GM-CSF on Gi alpha 2 is time-dependent, and, although a significant effect can be observed after incubation for 5 min with GM-CSF, the enhancement increases with increasing time. Genistein, a protein tyrosine kinase inhibitor, and 1,2-bis-(O-aminophenoxyl)ethane-NNN'N'-tetra-acetic acid (BAPTA), an intracellular Ca2+ chelator, decrease the stimulatory effect of GM-CSF. On the other hand, the protein-synthesis inhibitor cycloheximide does not affect the action of GM-CSF. Also, although preincubation of human neutrophils with GM-CSF increases the levels of Gi alpha 2 in the plasma membrane it does not alter the total amount of cellular Gi alpha 2. In addition, the level of Gi alpha 2 mRNA, unlike that of the proto-oncogene c-fos, is not increased in cells treated with GM-CSF. This indicates that the observed increase in the amount of Gi alpha 2 associated with the plasma membrane is not due to the synthesis of new Gi alpha 2. These data provide insight into the mechanism by which GM-CSF may prime human neutrophils for increased responsiveness to subsequent stimulation by G-protein-dependent agonists.

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Selected References

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