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Journal of Virology, July 1999, p. 5548-5555, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Matrix Metalloproteinase 9 Expression Is Induced by Epstein-Barr Virus Latent Membrane Protein 1 C-Terminal Activation Regions 1 and 2

Hajime Takeshita,1,2 Tomokazu Yoshizaki,1,2 William E. Miller,1,3 Hiroshi Sato,4 Mitsuru Furukawa,2 Joseph S. Pagano,1,3,5 and Nancy Raab-Traub1,3,*

Lineberger Comprehensive Cancer Center,1 Department of Microbiology and Immunology,3 and Department of Medicine,5 University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, and Department of Otolaryngology, School of Medicine,2 and Department of Molecular Virology and Oncology, Cancer Research Institute,4 Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640, Japan

Received 28 September 1998/Accepted 6 April 1999

Nasopharyngeal carcinoma (NPC), which is closely associated with the Epstein-Barr virus (EBV), is a highly metastatic malignant tumor. An important activity in tumor invasion and metastasis is that of the 92-kDa type IV collagenase or gelatinase, matrix metalloproteinase 9 (MMP-9), which mediates the degradation of the basement membrane and extracellular matrix. The expression of MMP-9 has been shown to be enhanced by the EBV oncoprotein, latent membrane protein 1 (LMP-1). LMP-1, which is expressed in NPC, has two essential signaling domains within the carboxy terminus, termed C-terminal activation regions 1 (CTAR-1) and CTAR-2. This study reveals that either signaling domain can activate the MMP-9 promoter and induce MMP-9 activity; however, LMP-1 deletion mutants lacking either CTAR-1 or CTAR-2 had a decreased ability to induce MMP-9 expression. The deletion of both activation regions completely abolished the induction of MMP-9 activity, while the cotransfection of both the CTAR-1 and CTAR-2 deletion mutants restored MMP-9 activity to levels produced by wild-type LMP-1. The NF-kappa B and activator protein 1 (AP-1) binding sites in the MMP-9 promoter were essential for the activation of MMP-9 gene expression by both CTAR-1 and CTAR-2. The induction of MMP-9 expression by LMP-1 and both CTAR-1 and CTAR-2 mutants was blocked by the overexpression of Ikappa B. The tumor necrosis factor receptor-associated factor (TRAF) pathway also contributed to the activation of the MMP-9 promoter as shown by the use of TRAF-2 and TRAF-3 dominant-negative constructs. These data indicate that the activation of both the NF-kappa B and AP-1 pathways by LMP-1, CTAR-1, and CTAR-2 is necessary for the activation of MMP-9 expression. In NPC, LMP-1 may contribute to invasiveness and metastasis through the induction of MMP-9 transcription and enzymatic activity.

* Corresponding author. Mailing address: Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC 27599. Phone: (919) 966-1701. Fax: (919) 966-3015. E-mail: nrt{at}med.unc.edu.

Journal of Virology, July 1999, p. 5548-5555, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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