Journal
VIRUSES-BASEL
Volume 13, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/v13101951
Keywords
LCMV; persistent viral infections; viral immunology; immunology models; T cell immunology; T cell exhaustion
Categories
Funding
- National Institutes of Health/National Institute of Allergy and Infectious Diseases (NIH/NIAID) [R01AI153076, R01AI162631]
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LCMV infection in mice serves as a valuable model for studying viral immune suppression and persistence. Mechanisms for CD8(+) T cell exhaustion have been extensively investigated, revealing crucial roles of inhibitory receptors and transcription factors, yet the mechanism for CD4(+) T cell suppression remains largely unknown.
Ever since the immune regulatory strains of lymphocytic choriomeningitis virus (LCMV), such as Clone 13, were isolated, LCMV infection of mice has served as a valuable model for the mechanistic study of viral immune suppression and virus persistence. The exhaustion of virus-specific T cells was demonstrated during LCMV infection, and the underlying mechanisms have been extensively investigated using LCMV infection in mouse models. In particular, the mechanism for gradual CD8(+) T cell exhaustion at molecular and transcriptional levels has been investigated. These studies revealed crucial roles for inhibitory receptors, surface markers, regulatory cytokines, and transcription factors, including PD-1, PSGL-1, CXCR5, and TOX in the regulation of T cells. However, the action mode for CD4(+) T cell suppression is largely unknown. Recently, sphingosine kinase 2 was proven to specifically repress CD4(+) T cell proliferation and lead to LCMV persistence. As CD4(+) T cell regulation was also known to be important for viral persistence, research to uncover the mechanism for CD4(+) T cell repression could help us better understand how viruses launch and prolong their persistence. This review summarizes discoveries derived from the study of LCMV in regard to the mechanisms for T cell suppression and approaches for the termination of viral persistence with special emphasis on CD8(+) T cells.
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