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. 1995 Jan;114(2):482–488. doi: 10.1111/j.1476-5381.1995.tb13252.x

Protein kinase C and tyrosine kinase pathways regulate lipopolysaccharide-induced nitric oxide synthase activity in RAW 264.7 murine macrophages.

A Paul 1, R H Pendreigh 1, R Plevin 1
PMCID: PMC1510244  PMID: 7533621

Abstract

1. In RAW 264.7 macrophages, lipopolysaccharide (LPS) and gamma-interferon (IFN gamma) alone or in combination stimulated the induction of nitric oxide synthase (iNOS) activity and increased the expression of the 130 kDa isoform of NOS. 2. LPS-induced NOS activity was reduced by incubation with CD14 neutralising antibodies and abolished in macrophages deprived of serum. 3. LPS stimulated a small increase in protein kinase C (PKC) activity in RAW 264.7 macrophages which was dependent on the presence of serum. However, IFN gamma did not potentiate LPS-stimulated PKC activity. 4. The protein kinase C inhibitor, Ro-318220, abolished both LPS- and IFN gamma-stimulated protein kinase C activity and the induction of NOS activity. 5. LPS- and IFN gamma-induced NOS activity was reduced by the tyrosine kinase inhibitor genestein. Genestein also reduced LPS-stimulated protein kinase C activity but did not affect the response to the protein kinase C activator, tetradecanoylphorbol acetate (TPA). 6. Nicotinamide, an inhibitor of poly-ADP ribosylation, abolished LPS- and IFN gamma-induced NOS activity. 7. Brefeldin A, an inhibitor of a factor which stimulates nucleotide exchange activity on the 21 kDa ADP-ribosylation factor, ARF, reduced LPS- and IFN gamma-induced NOS activity by approximately 80%. 8. These results suggest the involvement of protein kinase C, tyrosine kinase and poly-ADP ribosylation pathways in the regulation of the induction of nitric oxide synthase in RAW 264.7 macrophages by LPS and IFN gamma.

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Selected References

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