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Journal of Virology, June 2003, p. 6385-6393, Vol. 77, No. 11
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.11.6385-6393.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

STAT3 Ubiquitylation and Degradation by Mumps Virus Suppress Cytokine and Oncogene Signaling

Christina M. Ulane, Jason J. Rodriguez, Jean-Patrick Parisien, and Curt M. Horvath*

Immunobiology Center, Mount Sinai School of Medicine, New York, New York 10029

Received 26 November 2002/ Accepted 6 March 2003

Mumps virus is a common infectious agent of humans, causing parotitis, meningitis, encephalitis, and orchitis. Like other paramyxoviruses in the genus Rubulavirus, mumps virus catalyzes the proteasomal degradation of cellular STAT1 protein, a means for escaping antiviral responses initiated by alpha/beta and gamma interferons. We demonstrate that mumps virus also eliminates cellular STAT3, a protein that mediates transcriptional responses to cytokines, growth factors, nonreceptor tyrosine kinases, and a variety of oncogenic stimuli. STAT1 and STAT3 are independently targeted by a single mumps virus protein, called V, that assembles STAT-directed ubiquitylation complexes from cellular components, including STAT1, STAT2, STAT3, DDB1, and Cullin4A. Consequently, mumps virus V protein prevents responses to interleukin-6 and v-Src signals and can induce apoptosis in STAT3-dependent multiple myeloma cells and transformed murine fibroblasts. These findings demonstrate a unique cytokine and oncogene evasion property of mumps virus that provides a molecular basis for its observed oncolytic properties.


* Corresponding author. Mailing address: Immunobiology Center, Mount Sinai School of Medicine, One Gustave L. Levy Pl., Box 1630, New York, NY 10029. Phone: (212) 659-9406. Fax: (212) 849-2525. E-mail: curt.horvath{at}mssm.edu.


Journal of Virology, June 2003, p. 6385-6393, Vol. 77, No. 11
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.11.6385-6393.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.




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