PMID: 8460169Mar 15, 1993Paper

Mutual regulation of the transcriptional activator NF-kappa B and its inhibitor, I kappa B-alpha

Proceedings of the National Academy of Sciences of the United States of America
K BrownU Siebenlist

Abstract

The NK-kappa B transcription factor complex is sequestered in the cytoplasm by the inhibitory protein I kappa B-alpha (MAD-3). Various cellular stimuli relieve this inhibition by mechanisms largely unknown, leading to NF-kappa B nuclear localization and transactivation of its target genes. It is demonstrated here with human T lymphocytes and monocytes that different stimuli, including tumor necrosis factor alpha and phorbol 12-myristate 13-acetate, cause rapid degradation of I kappa B-alpha, with concomitant activation of NF-kappa B, followed by a dramatic increase in I kappa B-alpha mRNA and protein synthesis. Transfection studies reveal that the I kappa B-alpha mRNA and the encoded protein are potently induced by NF-kappa B and by homodimers of p65 and of c-Rel. We propose a model in which NF-kappa B and I kappa B-alpha mutually regulate each other in a cycle: saturating amounts of the inhibitory I kappa B-alpha protein are destroyed upon stimulation, allowing rapid activation of NF-kappa B. Subsequently, I kappa B-alpha mRNA and protein levels are quickly induced by the activated NF-kappa B. This resurgence of I kappa B-alpha protein acts to restore an equilibrium in which NF-kappa B is again inhibited.

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Citations

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