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Journal of Virology, October 2002, p. 9588-9599, Vol. 76, No. 19
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.19.9588-9599.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Replication of a Cytopathic Strain of Bovine Viral Diarrhea Virus Activates PERK and Induces Endoplasmic Reticulum Stress-Mediated Apoptosis of MDBK Cells

Robert Jordan, Lijuan Wang, Thomas M. Graczyk, Timothy M. Block, and Patrick R. Romano*

Department of Biochemistry and Molecular Pharmacology, The Jefferson Center for Biomedical Research, Thomas Jefferson University, Doylestown, Pennsylvania 18901

Received 10 April 2002/ Accepted 19 June 2002

Endoplasmic reticulum (ER) stress signaling is an adaptive cellular response to the loss of ER Ca2+ homeostasis and/or the accumulation of misfolded, unassembled, or aggregated proteins in the ER lumen. ER stress-activated signaling pathways regulate protein synthesis initiation and can also trigger apoptosis through the ER-associated caspase 12. Viruses that utilize the host cell ER as an integral part of their life cycle would be predicted to cause some level of ER stress. Bovine viral diarrhea virus (BVDV) is a positive-stranded RNA virus of the Flaviviridae family. BVDV and related flaviviruses use the host ER as the primary site of envelope glycoprotein biogenesis, genomic replication, and particle assembly. We are using a cytopathic strain of BVDV (cpBVDV) that causes cellular apoptosis as a model system to determine how virus-induced ER stress contributes to pathogenesis. We show that, in a natural infection of MDBK cells, cpBVDV activates the ER transmembrane kinase PERK (PKR-like ER kinase) and causes hyperphosphorylation of the translation initiation factor eIF2{alpha}, consistent with the induction of an ER stress response. Additionally, we show that initiation of cellular apoptosis correlates with downregulation of the antiapoptotic Bcl-2 protein, induced expression of caspase 12, and a decrease in intracellular glutathione levels. Defining the molecular stress pathways leading to cpBVDV-induced apoptosis provides the basis to study how other ER-tropic viruses, such as hepatitis C and B viruses, modulate the host cell ER stress response during the course of persistent infection.


* Corresponding author. Mailing address: Department of Biochemistry and Molecular Pharmacology, The Jefferson Center for Biomedical Research, Thomas Jefferson University, Doylestown, PA 18901. Phone: (215) 489-4911. Fax: (215) 489-4920. E-mail: Patrick.Romano{at}mail.tju.edu.


Journal of Virology, October 2002, p. 9588-9599, Vol. 76, No. 19
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.19.9588-9599.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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