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Recent Research on the JC Virus Hirofumi Sawa 1,2 , Tadaki Suzuki 1,3 , Yasuko Orba 3,4 , Yuji Sunden 2,5 , Kazuo Nagashima 4,6 1Department of Molecular Pathobiology,Hokkaido University Research Center for Zoonosis Control 221st Century COE Program for Zoonosis Control, Hokkaido University 3Research Fellow of the Japan Society for the Promotion of Science 4Laboratory of Molecular and Cellular Pathology, Hokkaido University Graduate School of Medicine 5Laboratory of Comparative Pathology, Hokkaido University Graduate School of Veterinary Medicine 6Department of Pathology, Sapporo Higashi-Tokushukai Hospital Keyword: JC virus , nuclear localization signal (NLS) , agnoprotein , siRNA pp.101-108
Published Date 2007/2/1
DOI https://doi.org/10.11477/mf.1416100013
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Abstract

 JC virus (JCV) is a causative agent of progressive multifocal leukoencephalopathy and belongs to Polyomavirus. In this article we describe our recent research relating to this virus. First, JCV's major capsid protein VP1 possesses a nuclear localization signal (NLS)and has the ability to construct a virus-like particle (VLP). We have investigated the mechanism of nuclear entry of JCV using VLP,and clarified the role of NLS. In vitro transport assay revealed that wild type VLP (wtVLP), but not ΔNLSVLP, entered the nuclei of cells. The nuclear transport of wtVLP was dependent on the addition of importins α and β and was prevented by antibodies to nuclear pore complex (NPC). These results suggested that JCV VLP binds to cellular importins via the NLS of VP1 and is transported into the nucleus through the NPC. Second, a yeast two-hybrid screen of a human brain cDNA library demonstrated that the fasciculation and elongation protein zeta 1 (FEZ1) and the heterochromatin protein 1α(HP1α) are proteins that interacted with JCV agnoprotein (Agno). In vitro binding assay showed that Agno interacts directly with FEZ1 and HP1α. We have also shown that Agno induces the dissociation of FEZ1 from microtubules and dissociates the interaction between HP1α and lamin B receptor. We have demonstrated that interaction between Agno and these host proteins inhibited nuclear egress of JCV. Third, in order to inhibit JCV infection in infected cells, we synthesized siRNA which is specific for JCV Agno. Immunoblotting and immunocytochemical analysis demonstrated that expression levels of agnoprotein and VP1 were significantly inhibited by specific siRNA. In addition, levels of viral mRNAs and viral production were decreased in the cells transfected with Agno siRNA. Furthermore, viral production of cell treated with Agno siRNA was significantly inhibited. These results indicate that post-infection treatment with siRNAs, that targets JCV Agno suppresses virus production in JCV infected cells. Thus,siRNA directed against JCV encoding genes may provide a useful tool for suppression of JCV infection.


Copyright © 2007, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1344-8129 印刷版ISSN 1881-6096 医学書院

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