Abstract
Colorectal cancer is a major cause of cancer deaths in Western countries, but epidemiological data suggest that dietary modification might reduce these by as much as 90%. Cyclo-oxygenase 2 (COX2), an inducible isoform of prostaglandin H synthase, which mediates prostaglandin synthesis during inflammation, and which is selectively overexpressed in colon tumours, is thought to play an important role in colon carcinogenesis. Curcumin, a constituent of turmeric, possesses potent anti-inflammatory activity and prevents colon cancer in animal models. However, its mechanism of action is not fully understood. We found that in human colon epithelial cells, curcumin inhibits COX2 induction by the colon tumour promoters, tumour necrosis factor α or fecapentaene-12. Induction of COX2 by inflammatory cytokines or hypoxia-induced oxidative stress can be mediated by nuclear factor kappa B (NF-κB). Since curcumin inhibits NF-κB activation, we examined whether its chemopreventive activity is related to modulation of the signalling pathway which regulates the stability of the NF-κB-sequestering protein, IκB. Recently components of this pathway, NF-κB-inducing kinase and IκB kinases, IKKα and β, which phosphorylate IκB to release NF-κB, have been characterised. Curcumin prevents phosphorylation of IκB by inhibiting the activity of the IKKs. This property, together with a long history of consumption without adverse health effects, makes curcumin an important candidate for consideration in colon cancer prevention.
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Abbreviations
- NF-κB:
-
nuclear factor kappa B
- COX-2:
-
cyclo-oxygenase-2
- TNFα:
-
tumour necrosis factor alpha
- FEC:
-
fecapentaene-12
- PMA:
-
phorbol 12-myristate 13-acetate
- CUR:
-
curcumin
- SAL:
-
salicylate
- CAPE:
-
caffeic acid phenyl ester
- NAC:
-
N-acetyl cysteine
- NIK:
-
NF-κB inducing kinase
- IKK:
-
I kappa B kinase
- EMSA:
-
electrophoretic mobility gel shift assay
- ANOVA:
-
analysis of variance
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Acknowledgements
We thank Helen Ball for technical assistance and also Andreas Gescher and Ann Hudson for helpful discussions and comments on the manuscript. SM Plummer benefited from a BACR mid-career fellowship which supported part of this work.
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Plummer, S., Holloway, K., Manson, M. et al. Inhibition of cyclo-oxygenase 2 expression in colon cells by the chemopreventive agent curcumin involves inhibition of NF-κB activation via the NIK/IKK signalling complex. Oncogene 18, 6013–6020 (1999). https://doi.org/10.1038/sj.onc.1202980
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DOI: https://doi.org/10.1038/sj.onc.1202980
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