Host transcriptional response to persistent infection with a live-attenuated porcine reproductive and respiratory syndrome virus strain

Jayeshbhai Chaudhari, Chia Sin Liew, Aspen M. Workman, Jean Jack M. Riethoven, David Steffen, Sarah Sillman, Hiep L.X. Vu

Research output: Contribution to journalArticle

Abstract

Both virulent and live-attenuated porcine reproductive and respiratory syndrome virus (PRRSV) strains can establish persistent infection in lymphoid tissues of pigs. To investigate the mechanisms of PRRSV persistence, we performed a transcriptional analysis of inguinal lymphoid tissue collected from pigs experimentally infected with an attenuated PRRSV strain at 46 days post infection. A total of 6404 differentially expressed genes (DEGs) were detected of which 3960 DEGs were upregulated and 2444 DEGs were downregulated. Specifically, genes involved in innate immune responses and chemokines and receptors associated with T-cell homing to lymphoid tissues were down regulated. As a result, homing of virus-specific T-cells to lymphoid tissues seems to be ineffective, evidenced by the lower frequencies of virus-specific T-cell in lymphoid tissue than in peripheral blood. Genes associated with T-cell exhaustion were upregulated. Likewise, genes involved in the anti-apoptotic pathway were upregulated. Collectively, the data suggested that the live-attenuated PRRSV strain establishes a pro-survival microenvironment in lymphoid tissue by suppressing innate immune responses, T-cell homing, and preventing cell apoptosis.

Original languageEnglish (US)
Article number817
JournalViruses
Volume12
Issue number8
DOIs
StatePublished - Aug 2020

Keywords

  • Apoptosis
  • PRRSV
  • Persistent infection
  • RNA-sequencing
  • T-cell exhaustion
  • Transcriptome

ASJC Scopus subject areas

  • Infectious Diseases
  • Virology

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