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Original Article |
Correspondence to: David H. Beach, Institute of Child Health, University College London, Cruciform Building, Gower Street, London WC1E 6BT, UK. Tel:171-813-8495 Fax:171-813-0358 E-mail:D.Beach{at}ich.ucl.ac.uk.
p53 has a key role in the negative regulation of cell proliferation, in the maintenance of genomic stability, and in the suppression of transformation and tumorigenesis. To identify novel regulators of p53, we undertook two functional screens to isolate genes which bypassed either p53-mediated growth arrest or apoptosis. In both screens, we isolated cDNAs encoding macrophage migration inhibitory factor (MIF), a cytokine that was shown previously to exert both local and systemic proinflammatory activities. Treatment with MIF overcame p53 activity in three different biological assays, and suppressed its activity as a transcriptional activator. The observation that a proinflammatory cytokine, MIF, is capable of functionally inactivating a tumor suppressor, p53, may provide a link between inflammation and tumorigenesis.
Key Words: macrophage migration inhibitory factor, p53, inflammation and cancer, growth arrest, apoptosis
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