Pathology caused by persistent murine norovirus infection

Research output: Contribution to journalArticle

Authors

  • Amita Shortland
  • James Chettle
  • Joy Archer
  • Kathryn Wood
  • Ian Goodfellow
  • Barbara A Blacklaws
  • Jonathan L Heeney

Colleges, School and Institutes

Abstract

Subclinical infection of murine norovirus (MNV) was detected in a mixed breeding group of WT and Stat1(-/-) mice with no outward evidence of morbidity or mortality. Investigations revealed the presence of an attenuated MNV variant that did not cause cytopathic effects in RAW264.7 cells or death in Stat1(-/-) mice. Histopathological analysis of tissues from WT, heterozygous and Stat1(-/-) mice revealed a surprising spectrum of lesions. An infectious molecular clone was derived directly from faeces (MNV-O7) and the sequence analysis confirmed it was a member of norovirus genogroup V. Experimental infection with MNV-O7 induced a subclinical infection with no weight loss in Stat1(-/-) or WT mice, and recapitulated the clinical and pathological picture of the naturally infected colony. Unexpectedly, by day 54 post-infection, 50 % of Stat1(-/-) mice had cleared MNV-O7. In contrast, all WT mice remained infected persistently. Most significantly, this was associated with liver lesions in all the subclinically infected WT mice. These data confirmed that long-term persistence in WT mice is established with specific variants of MNV and that despite a subclinical presentation, active foci of acute inflammation persist within the liver. The data also showed that STAT1-dependent responses are not required to protect mice from lethal infection with all strains of MNV.

Details

Original languageEnglish
Pages (from-to)413-22
Number of pages10
JournalJournal of General Virology
Volume95
Issue numberPt 2
Publication statusPublished - Feb 2014

Keywords

  • Animal Structures, Animals, Asymptomatic Infections, Caliciviridae Infections, Cell Line, Cytopathogenic Effect, Viral, Histocytochemistry, Macrophages, Mice, Mice, Knockout, Molecular Sequence Data, Norovirus, RNA, Viral, STAT1 Transcription Factor, Sequence Analysis, DNA