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Molecular and Cellular Biology, June 2004, p. 5223-5234, Vol. 24, No. 12
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.12.5223-5234.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Epstein-Barr Virus Latent Membrane Protein 1 Induces Synthesis of Hypoxia-Inducible Factor 1{alpha}

Naohiro Wakisaka,1,2 Satoru Kondo,1,2 Tomokazu Yoshizaki,2 Shigeyuki Murono,2 Mitsuru Furukawa,2 and Joseph S. Pagano1*

Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina 27599-7295,1 Department of Otolaryngology, School of Medicine, Kanazawa University, Kanazawa 920-8640, Japan2

Received 16 October 2003/ Returned for modification 5 December 2003/ Accepted 25 March 2004

Hypoxia-inducible factor 1 (HIF-1) is a heterodimeric basic helix-loop-helix transcription factor composed of HIF-1{alpha} and HIF-1ß that is the central regulator of responses to hypoxia. The specific binding of HIF-1 to the hypoxia-responsive element (HRE) induces the transcription of genes that respond to hypoxic conditions, including vascular endothelial growth factor (VEGF). Here we report that expression of HIF-1{alpha} is increased in diverse Epstein-Barr virus (EBV)-infected type II and III cell lines, which express EBV latent membrane protein 1 (LMP1), the principal EBV oncoprotein, as well as other latency proteins, but not in the parental EBV-negative cell lines. We show first that transfection of an LMP1 expression plasmid into Ad-AH cells, an EBV-negative nasopharyngeal epithelial cell line, induces synthesis of HIF-1{alpha} protein without increasing its stability or mRNA level. The mitogen-activated protein kinase (MAPK) kinase inhibitor PD98059 markedly reduces induction of HIF-1{alpha} by LMP1. Catalase, an H2O2 scavenger, strongly suppresses LMP1-induced production of H2O2, which results in a decrease in the expression of HIF-1{alpha} induced by LMP1. Inhibition of the NF-{kappa}B, c-jun N-terminal kinase, p38 MAPK, and phosphatidylinositol 3-kinase pathways did not affect HIF-1{alpha} expression. Moreover, LMP1 induces HIF-1 DNA binding activity and upregulates HRE and VEGF promoter transcriptional activity. Finally, LMP1 increases the appearance of VEGF protein in extracellular fluids; induction of VEGF is suppressed by PD98059 or catalase. These results suggest that LMP1 increases HIF-1 activity through induction of HIF-1{alpha} protein expression, which is controlled by p42/p44 MAPK activity and H2O2. The ability of EBV, and specifically its major oncoprotein, LMP1, to induce HIF-1{alpha} along with other invasiveness and angiogenic factors reported previously discloses additional oncogenic properties of this tumor virus.


* Corresponding author. Mailing address: Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599-7295. Phone: (919) 966-8644. Fax: (919) 966-9673. E-mail: Joseph_Pagano{at}med.unc.edu.


Molecular and Cellular Biology, June 2004, p. 5223-5234, Vol. 24, No. 12
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.12.5223-5234.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.




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