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Molecular and Cellular Biology, May 2005, p. 3784-3792, Vol. 25, No. 9
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.9.3784-3792.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Selective Regulation of c-jun Gene Expression by Mitogen-Activated Protein Kinases via the 12-O-Tetradecanoylphorbol-13-Acetate- Responsive Element and Myocyte Enhancer Factor 2 Binding Sites

Midori Kayahara,{dagger} Xin Wang,{dagger} and Cathy Tournier*

Faculty of Life Sciences, University of Manchester, The Michael Smith Building, Oxford Road, Manchester M13 9PT, United Kingdom

Received 20 December 2004/ Accepted 26 January 2005

To further understand how the mitogen-activated protein kinase (MAPK) signaling pathways regulate AP-1 activity, we have elucidated the physiological role of these cascades in the regulation of c-jun gene expression. c-Jun is a crucial component of AP-1 complexes and has been shown in vitro to be a point of integration of numerous signals that can differentially affect its expression as well as its transcriptional activity. Our strategy was based on the use of (i) genetically modified fibroblasts deficient in components of the MAPK cascades and (ii) pharmacological reagents. The results demonstrate that c-Jun NH2-terminal protein kinase (JNK) is essential for a basal level of c-Jun expression and for c-Jun phosphorylation in response to stress. In addition to JNK, p38 MAPK or ERK1/2 and ERK5 are required for mediating UV radiation- or epidermal growth factor (EGF)-induced c-Jun expression, respectively. Further studies indicate that p38 MAPK inhibits the activation of JNK in response to EGF, causing a down-regulation of c-Jun. Overall, these data provide important insights into the mechanisms that ultimately determine the function of c-Jun as a regulator of cell fate.

* Corresponding author. Mailing address: Faculty of Life Sciences, University of Manchester, The Michael Smith Building, Oxford Road, Manchester M13 9PT, United Kingdom. Phone: 44 161 275 5417. Fax: 44 161 275 5082. E-mail: cathy.tournier{at}manchester.ac.uk.

{dagger} M.K. and X.W. contributed equally to this study.

Molecular and Cellular Biology, May 2005, p. 3784-3792, Vol. 25, No. 9
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.9.3784-3792.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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