The recent introduction of a highly pathogenic strains of West Nile Virus (WNV) into naive populations in Europe, Israel and the United States have resulted in epidemics with a marked increase in both the number of reported cases and the severity of disease compared to previous outbreaks. The increased virulence of the recently emerged strain of WNV is further complicated by the fact that antiviral therapies and vaccines are not currently available for use in humans. The molecular mechanisms for the increase in pathogenesis of WNV are currently unknown but are likely to include novel viral-host interactions that allow the virus to overcome or evade the host innate and/or adaptive immune response. Our preliminary studies indicate that pathogenic and nonpathogenic strains of WNV differ dramatically in their interactions with innate antiviral programs. This suggests that the comparison of the antiviral responses to pathogenic and nonpathogenic strains of WNV will provide key insights in viral factors involved in WNV- mediated pathogenesis.
The specific aim of this proposal are (1) Determination of the pattern recognition receptors involved in detecting pathogenic and nonpathogenic strains of WNV (2) Identification of agonists of the innate antiviral response generated during WNV infection and (3) Determination of viral factors responsible for WNV virulence. A greater understanding of how strains with difference virulence phenotypes interact with the innate antiviral response will aid in the development of effective vaccines and therapeutic agents.

Public Health Relevance

The ability of the cell to detect and respond to an invading pathogen is critical to its ability to defend itself against infections. This proposal will examine how cells detect West Nile virus infections and conversely the mechanisms the virus utilizes to control the cellular environment.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Special Emphasis Panel (ZRG1-IDM-P (02))
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Repik, Patricia M
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University of Maryland College Park
Anatomy/Cell Biology
Schools of Earth Sciences/Natur
College Park
United States
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Hussmann, Katherine L; Vandergaast, Rianna; Ochsner, Susan Park et al. (2014) In vitro and in vivo characterization of a West Nile virus MAD78 infectious clone. Arch Virol 159:3113-8
Hussmann, Katherine L; Vandergaast, Rianna; Zheng, Kang et al. (2014) Structural proteins of West Nile virus are a major determinant of infectious particle production and fitness in astrocytes. J Gen Virol 95:1991-2003
Vandergaast, Rianna; Hoover, Lisa I; Zheng, Kang et al. (2014) Generation of West Nile virus infectious clones containing amino acid insertions between capsid and capsid anchor. Viruses 6:1637-53
Hussmann, Katherine L; Fredericksen, Brenda L (2014) Differential induction of CCL5 by pathogenic and non-pathogenic strains of West Nile virus in brain endothelial cells and astrocytes. J Gen Virol 95:862-7
Hoover, Lisa I; Fredericksen, Brenda L (2014) IFN-dependent and -independent reduction in West Nile virus infectivity in human dermal fibroblasts. Viruses 6:1424-41
Hussmann, Katherine L; Samuel, Melanie A; Kim, Kwang S et al. (2013) Differential replication of pathogenic and nonpathogenic strains of West Nile virus within astrocytes. J Virol 87:2814-22