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Originally published In Press as doi:10.1074/jbc.M402059200 on June 7, 2004
J. Biol. Chem., Vol. 279, Issue 31, 32393-32400, July 30, 2004
The Stability of Tristetraprolin mRNA Is Regulated by Mitogen-activated Protein Kinase p38 and by Tristetraprolin Itself*
Carmen R. Tchen,
Matthew Brook,
Jeremy Saklatvala, and
Andrew R. Clark
From the
Kennedy Institute of Rheumatology Division, Imperial College London, 1 Aspenlea Road, Hammersmith, London W6 8LH, United Kingdom
Tristetraprolin (TTP) is an mRNA-destabilizing protein that negatively regulates the expression of proinflammatory mediators such as tumor necrosis factor , granulocyte/macrophage colony-stimulating factor, and cyclooxygenase 2. Here we investigate the regulation of TTP expression in the mouse macrophage cell line RAW264.7. We show that TTP mRNA is expressed in a biphasic manner following stimulation of cells with lipopolysaccharide and that the second phase of expression, like the first, is dependent on mitogen-activated protein kinase (MAPK) p38. MAPK p38 acts through a downstream kinase to stabilize TTP mRNA, and this stabilization is mediated by an adenosine/uridine-rich region at the 3'-end of the TTP 3'-untranslated region. Hence TTP is post-transcriptionally regulated in a similar manner to several proinflammatory genes. We also demonstrate that TTP is able to bind to its own 3'-untranslated region and negatively regulate its own expression, forming a feedback loop to limit expression levels.
Received for publication, February 25, 2004
, and in revised form, May 21, 2004.
* The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.: 44-208-383-4430; Fax: 44-208-383-4496; E-mail: andy.clark{at}ic.ac.uk.

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Copyright © 2004 by the American Society for Biochemistry and Molecular Biology.
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