West Nile virus infection activates the unfolded protein response, leading to CHOP induction and apoptosis

Guruprasad R. Medigeshi, Alissa M. Lancaster, Alec Hirsch, Thomas Briese, W. Ian Lipkin, Victor De Filippis, Klaus Frueh, Peter W. Mason, Janko Nikolich-Zugich, Jay Nelson

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Abstract

West Nile virus (WNV)-mediated neuronal death is a hallmark of WNV meningitis and encephalitis. However, the mechanisms of WNV-induced neuronal damage are not well understood. We investigated WNV neuropathogenesis by using human neuroblastoma cells and primary rat hippocampal neurons. We observed that WNV activates multiple unfolded protein response (UPR) pathways, leading to transcriptional and translational induction of UPR target genes. We evaluated the role of the three major UPR pathways, namely, inositol-requiring enzyme 1-dependent splicing of X box binding protein 1 (XBP1) mRNA, activation of activating transcription factor 6 (ATF6), and protein kinase R-like endoplasmic reticulum (ER) kinase-dependent eukaryotic initiation factor 2α (eIF2α) phosphorylation, in WNV-infected cells. We show that XBP1 is nonessential or can be replaced by other UPR pathways in WNV replication. ATF6 was rapidly degraded by proteasomes, consistent with induction of ER stress by WNV. We further observed a transient phosphorylation of eIF2α and induction of the proapoptotic cyclic AMP response element-binding transcription factor homologous protein (CHOP). WNV-infected cells exhibited a number of apoptotic phenotypes, such as (i) induction of growth arrest and DNA damage-inducible gene 34, (ii) activation of caspase-3, and (iii) cleavage of poly(ADP-ribose) polymerase. The expression of WNV nonstructural proteins alone was sufficient to induce CHOP expression. Importantly, WNV grew to significantly higher viral titers in chop-/- mouse embryonic fibroblasts (MEFs) than in wild-type MEFs, suggesting that CHOP-dependent premature cell death represents a host defense mechanism to limit viral replication that might also be responsible for the widespread neuronal loss observed in WNV-infected neuronal tissue.

Original languageEnglish (US)
Pages (from-to)10849-10860
Number of pages12
JournalJournal of Virology
Volume81
Issue number20
DOIs
StatePublished - Oct 2007

Fingerprint

unfolded protein response
Unfolded Protein Response
West Nile virus
Virus Diseases
apoptosis
Apoptosis
infection
Activating Transcription Factor 6
Eukaryotic Initiation Factor-2
transcription factors
virus replication
endoplasmic reticulum
fibroblasts
binding proteins
phosphorylation
Fibroblasts
Phosphorylation
NAD ADP-ribosyltransferase
chops
Endoplasmic Reticulum Stress

ASJC Scopus subject areas

  • Immunology

Cite this

West Nile virus infection activates the unfolded protein response, leading to CHOP induction and apoptosis. / Medigeshi, Guruprasad R.; Lancaster, Alissa M.; Hirsch, Alec; Briese, Thomas; Lipkin, W. Ian; De Filippis, Victor; Frueh, Klaus; Mason, Peter W.; Nikolich-Zugich, Janko; Nelson, Jay.

In: Journal of Virology, Vol. 81, No. 20, 10.2007, p. 10849-10860.

Research output: Contribution to journalArticle

Medigeshi, GR, Lancaster, AM, Hirsch, A, Briese, T, Lipkin, WI, De Filippis, V, Frueh, K, Mason, PW, Nikolich-Zugich, J & Nelson, J 2007, 'West Nile virus infection activates the unfolded protein response, leading to CHOP induction and apoptosis', Journal of Virology, vol. 81, no. 20, pp. 10849-10860. https://doi.org/10.1128/JVI.01151-07
Medigeshi, Guruprasad R. ; Lancaster, Alissa M. ; Hirsch, Alec ; Briese, Thomas ; Lipkin, W. Ian ; De Filippis, Victor ; Frueh, Klaus ; Mason, Peter W. ; Nikolich-Zugich, Janko ; Nelson, Jay. / West Nile virus infection activates the unfolded protein response, leading to CHOP induction and apoptosis. In: Journal of Virology. 2007 ; Vol. 81, No. 20. pp. 10849-10860.
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AU - Lancaster, Alissa M.

AU - Hirsch, Alec

AU - Briese, Thomas

AU - Lipkin, W. Ian

AU - De Filippis, Victor

AU - Frueh, Klaus

AU - Mason, Peter W.

AU - Nikolich-Zugich, Janko

AU - Nelson, Jay

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N2 - West Nile virus (WNV)-mediated neuronal death is a hallmark of WNV meningitis and encephalitis. However, the mechanisms of WNV-induced neuronal damage are not well understood. We investigated WNV neuropathogenesis by using human neuroblastoma cells and primary rat hippocampal neurons. We observed that WNV activates multiple unfolded protein response (UPR) pathways, leading to transcriptional and translational induction of UPR target genes. We evaluated the role of the three major UPR pathways, namely, inositol-requiring enzyme 1-dependent splicing of X box binding protein 1 (XBP1) mRNA, activation of activating transcription factor 6 (ATF6), and protein kinase R-like endoplasmic reticulum (ER) kinase-dependent eukaryotic initiation factor 2α (eIF2α) phosphorylation, in WNV-infected cells. We show that XBP1 is nonessential or can be replaced by other UPR pathways in WNV replication. ATF6 was rapidly degraded by proteasomes, consistent with induction of ER stress by WNV. We further observed a transient phosphorylation of eIF2α and induction of the proapoptotic cyclic AMP response element-binding transcription factor homologous protein (CHOP). WNV-infected cells exhibited a number of apoptotic phenotypes, such as (i) induction of growth arrest and DNA damage-inducible gene 34, (ii) activation of caspase-3, and (iii) cleavage of poly(ADP-ribose) polymerase. The expression of WNV nonstructural proteins alone was sufficient to induce CHOP expression. Importantly, WNV grew to significantly higher viral titers in chop-/- mouse embryonic fibroblasts (MEFs) than in wild-type MEFs, suggesting that CHOP-dependent premature cell death represents a host defense mechanism to limit viral replication that might also be responsible for the widespread neuronal loss observed in WNV-infected neuronal tissue.

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