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Molecular and Cellular Biology, December 2004, p. 10844-10856, Vol. 24, No. 24
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.24.10844-10856.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

c-Jun N-Terminal Protein Kinase 1 (JNK1), but Not JNK2, Is Essential for Tumor Necrosis Factor Alpha-Induced c-Jun Kinase Activation and Apoptosis

Jing Liu, Yuzuru Minemoto, and Anning Lin*

Ben May Institute for Cancer Research, The University of Chicago, Chicago, Illinois

Received 11 August 2004/ Returned for modification 13 September 2004/ Accepted 20 September 2004

Two ubiquitously expressed isoforms of c-Jun N-terminal protein kinase (JNK), JNK1 and JNK2, have shared functions and different functions. However, the molecular mechanism is unknown. Here we report that JNK1, but not JNK2, is essential for tumor necrosis factor alpha (TNF-{alpha})-induced c-Jun kinase activation, c-Jun expression, and apoptosis. Using mouse fibroblasts deficient in either Jnk1 or Jnk2, we found that JNK1 was activated by TNF-{alpha}, whereas JNK2 activation was negligible. In addition, JNK2 interfered with JNK1 activation via its "futile" phosphorylation by upstream kinases. Consequently, expression and activation of c-Jun, which depends on JNK activity, were impaired in Jnk1 null cells but enhanced in Jnk2 null cells. TNF-{alpha}-induced apoptosis was also suppressed in Jnk1 null fibroblasts but increased in Jnk2 null cells. Thus, our results provide a molecular mechanism underlying the different biological functions of JNK isoforms.

* Corresponding author. Mailing address: Ben May Institute for Cancer Research, The University of Chicago, 5841 S. Maryland Ave., MC 60627, Chicago, IL 60637. Phone: (773) 753-1408. Fax: (773) 702-6260. E-mail: alin{at}huggins.bsd.uchicago.edu.

Molecular and Cellular Biology, December 2004, p. 10844-10856, Vol. 24, No. 24
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.24.10844-10856.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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