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Molecular and Cellular Biology, February 2006, p. 1297-1306, Vol. 26, No. 4
0270-7306/06/$08.00+0     doi:10.1128/MCB.26.4.1297-1306.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Tumorigenesis Suppressor Pdcd4 Down-Regulates Mitogen-Activated Protein Kinase Kinase Kinase Kinase 1 Expression To Suppress Colon Carcinoma Cell Invasion

Hsin-Sheng Yang,1* Connie P. Matthews,1 Timothy Clair,2 Qing Wang,1 Alyson R. Baker,1 Chou-Chi H. Li,1,3 Tse-Hua Tan,4 and Nancy H. Colburn1*

Laboratory of Cancer Prevention, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702,1 Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892,2 Basic Research Program, SAIC—Frederick, Frederick, Maryland 21702,3 Department of Immunology, Bayer College of Medicine, Houston, Texas 770304

Received 8 July 2005/ Returned for modification 2 August 2005/ Accepted 22 November 2005

Programmed cell death 4 (Pdcd4) suppresses neoplastic transformation by inhibiting the activation of c-Jun and consequently AP-1-dependent transcription. We report that Pdcd4 blocks c-Jun activation by inhibiting the expression of mitogen-activated protein kinase kinase kinase kinase 1 (MAP4K1)/hematopoietic progenitor kinase 1, a kinase upstream of Jun N-terminal kinase (JNK). cDNA microarray analysis of Pdcd4-overexpressing RKO human colon carcinoma cells revealed MAP4K1 as the sole target of Pdcd4 on the JNK activation pathway. Cotransfection of a MAP4K1 promoter-reporter with Pdcd4 demonstrated inhibition of transcription from the MAP4K1 promoter. Ectopic expression of Pdcd4 in metastatic RKO cells suppressed invasion. MAP4K1 activity is functionally significant in invasion, as overexpression of a dominant negative MAP4K1 (dnMAP4K1) mutant in RKO cells inhibited not only c-Jun activation but also invasion. Overexpression of a MAP4K1 cDNA in Pdcd4-transfected cells rescued the kinase activity of JNK. Thus, Pdcd4 suppresses tumor progression in human colon carcinoma cells by the novel mechanism of down-regulating MAP4K1 transcription, with consequent inhibition of c-Jun activation and AP-1-dependent transcription.

* Corresponding author. Present address for Hsin-Sheng Yang: Graduate Center for Toxicology, College of Medicine, University of Kentucky, Lexington, KY 40536. Phone: (859) 323-6684. Fax: (859) 323-1059. E-mail: hyang3{at}uky.edu. Mailing address for Nancy H. Colburn: Laboratory of Cancer Prevention, Center for Cancer Research, National Cancer Institute—Frederick, Frederick, MD 21702. Phone: (301) 846-1333. Fax: (301) 846-6907. E-mail: colburn{at}mail.ncifcrf.gov.

Molecular and Cellular Biology, February 2006, p. 1297-1306, Vol. 26, No. 4
0022-538X/06/$08.00+0     doi:10.1128/MCB.26.4.1297-1306.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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