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. 1990 Aug;9(8):2423-8, 2389. doi: 10.1002/j.1460-2075.1990.tb07418.x

Colony-stimulating factor 1 activates protein kinase C in human monocytes.

K Imamura 1, A Dianoux 1, T Nakamura 1, D Kufe 1
PMCID: PMC552267  PMID: 2196173

Abstract

Colony-stimulating factor 1 (CSF-1) is required for the survival, proliferation and differentiation of monocytes. We previously demonstrated that the CSF-1 receptor is linked to a pertussis toxin-sensitive G protein and that the induction of Na+ influx by CSF-1 is a pertussis toxin-sensitive event. The present studies have examined activation of protein kinase C as a potential intracellular signaling event induced by the activated CSF-1 receptor. The results demonstrate that CSF-1 stimulates translocation of protein kinase C activity from the cytosol to membrane fractions. This activation of protein kinase C was sensitive to pretreatment of the monocytes with pertussis toxin. Lipid distribution studies demonstrated that phosphatidylcholine (PC) is the major phospholipid in human monocytes. Moreover, the results indicate that CSF-1 stimulation is associated with decreases in PC, but not in phosphatidylinositol (PI), levels. The absence of an effect of CSF-1 on PI turnover was confirmed by the lack of changes in inositol phosphate production. In contrast, CSF-1 stimulation was associated with increased hydrolysis of PC to phosphorylcholine and diacylglycerol (DAG) in both intact monocytes and cell-free assays. Furthermore, the increase in PC turnover induced by CSF-1 was sensitive to pertussis toxin. The results also demonstrate that the induction of Na+ influx by CSF-1 is inhibited by the protein kinase C inhibitors staurosporine and the isoquinoline derivative H7, but not by HA1004.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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