Dr. Li, Chia-Wei 's publons link picture

Dr. Li, Chia-Wei

Assistant Research Fellow
  • 02-2789-9055 (Lab) (Room No: N147)
  • 02-2652-3912 (Office)
  • 02-2782-9224 (Fax)

  • Cancer immunotherapy
  • Antibody discovery
  • Cancer metastasis

Education and Positions:
  • Ph.D. Rutgers University

Highlight Detail

Upregulation of PD-L1 by SARS-CoV-2 promotes immune evasion

Dr. Li, Chia-Wei
Journal of medical virology, Jan 07, 2023




Patients with severe COVID-19 often suffer from lymphopenia, which is linked to T cell sequestration, cytokine storm and mortality. However, it remains largely unknown how SARS-CoV-2 induces lymphopenia. Here, we studied the transcriptomic profile and epigenomic alterations involved in cytokine production by SARS-CoV-2-infected cells. We adopted a reverse time-order gene coexpression network (TO-GCN) approach to analyze time-series RNA-sequencing data, revealing epigenetic modifications at the late stage of viral egress. Furthermore, we identified SARS-CoV-2-activated NF-κB and IRF1 pathways contributing to viral infection and COVID-19 severity through epigenetic analysis of H3K4me3 ChIP-sequencing. Cross-referencing our transcriptomic and epigenomic datasets revealed that coupling NF-κB and IRF1 pathways mediate PD-L1 immunosuppressive programs. Interestingly, we observed higher PD-L1 expression in Omicron-infected cells than SARS-CoV-2 infected cells. Blocking PD-L1 at an early stage of virally-infected AAV-hACE2 mice significantly recovered lymphocyte counts and lowered inflammatory cytokine levels. Our findings indicate that targeting the SARS-CoV-2-mediated NF-κB and IRF1-PD-L1 axis may represent an alternative strategy to reduce COVID-19 severity. This article is protected by copyright. All rights reserved.