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Filoviral Immune Evasion Mechanisms
Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
Department of Microbiology, Mount Sinai School of Medicine, New York, NY 10029, USA
Biochemistry Graduate Program, Iowa State University, Ames, IA 50011, USA
Biochemistry Undergraduate Program, Iowa State University, Ames, IA 50011, USA
* Authors to whom correspondence should be addressed.
Received: 11 August 2011; Accepted: 15 August 2011 / Published: 7 September 2011
Abstract: The Filoviridae family of viruses, which includes the genera Ebolavirus (EBOV) and Marburgvirus (MARV), causes severe and often times lethal hemorrhagic fever in humans. Filoviral infections are associated with ineffective innate antiviral responses as a result of virally encoded immune antagonists, which render the host incapable of mounting effective innate or adaptive immune responses. The Type I interferon (IFN) response is critical for establishing an antiviral state in the host cell and subsequent activation of the adaptive immune responses. Several filoviral encoded components target Type I IFN responses, and this innate immune suppression is important for viral replication and pathogenesis. For example, EBOV VP35 inhibits the phosphorylation of IRF-3/7 by the TBK-1/IKKε kinases in addition to sequestering viral RNA from detection by RIG-I like receptors. MARV VP40 inhibits STAT1/2 phosphorylation by inhibiting the JAK family kinases. EBOV VP24 inhibits nuclear translocation of activated STAT1 by karyopherin-α. The examples also represent distinct mechanisms utilized by filoviral proteins in order to counter immune responses, which results in limited IFN-α/β production and downstream signaling.
Keywords: Ebolavirus; Marburgvirus; IFN antagonist; innate immune evasion
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MDPI and ACS Style
Ramanan, P.; Shabman, R.S.; Brown, C.S.; Amarasinghe, G.K.; Basler, C.F.; Leung, D.W. Filoviral Immune Evasion Mechanisms. Viruses 2011, 3, 1634-1649.
Ramanan P, Shabman RS, Brown CS, Amarasinghe GK, Basler CF, Leung DW. Filoviral Immune Evasion Mechanisms. Viruses. 2011; 3(9):1634-1649.
Ramanan, Parameshwaran; Shabman, Reed S.; Brown, Craig S.; Amarasinghe, Gaya K.; Basler, Christopher F.; Leung, Daisy W. 2011. "Filoviral Immune Evasion Mechanisms." Viruses 3, no. 9: 1634-1649.