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B Activation and Proinflammatory Gene Expression by Inhibiting Inhibitory Factor I-
B Kinase Activity1



,

Departments of
*
Medicine, Microbiology, and Immunology,
Biochemistry and Biophysics, and
Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill, NC 27599;
§
Department of Natural Sciences, Fayettsville State University, Fayettesville, NC, 28301; and
¶
Narula Research, Chapel Hill, NC 27516
NF-
B plays a critical role in the transcriptional regulation of
proinflammatory gene expression in various cells. Cytokine-mediated
activation of NF-
B requires activation of various kinases, which
ultimately leads to the phosphorylation and degradation of I
B, the
NF-
B cytoplasmic inhibitor. The food derivative curcumin has been
shown to inhibit NF-
B activity in some cell types. In this report we
investigate the mechanism of action of curcumin on cytokine-induced
proinflammatory gene expression using intestinal epithelial cells
(IEC). Curcumin inhibited IL-1ß-mediated ICAM-1 and IL-8 gene
expression in IEC-6, HT-29, and Caco-2 cells. Cytokine-induced NF-
B
DNA binding activity, RelA nuclear translocation, I
B
degradation,
I
B serine 32 phosphorylation, and I
B kinase (IKK) activity were
blocked by curcumin treatment. Wound-induced p38 phosphorylation was
not inhibited by curcumin treatment. In addition, mitogen-activated
protein kinase/ERK kinase kinase-1-induced IL-8 gene expression and
12-O-tetraphorbol 12-myristate 13-acetate-responsive
element-driven luciferase expression were inhibited by curcumin.
However, I
B
degradation induced by ectopically expressed
NF-
B-inducing kinase or IKK was not inhibited by curcumin treatment.
Therefore, curcumin blocks a signal upstream of NF-
B-inducing kinase
and IKK. We conclude that curcumin potently inhibits cytokine-mediated
NF-
B activation by blocking a signal leading to IKK
activity.
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