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Updated: May 18, 2026

Phenotypic and Functional Analysis of Activated Regulatory T Cells Isolated from Chronic Lymphocytic Choriomeningitis Virus-infected Mice
Published on: June 22, 2016
Regulating type 1 IFN effects in CD8 T cells during viral infections: changing STAT4 and STAT1 expression for
M Pilar Gil1, Mickaël J Y Ploquin, Wendy T Watford
1Department of Molecular Microbiology and Immunology, Brown University, Providence, RI 02903, USA.
Type 1 interferons (IFNs) activate STAT4 over STAT1 in CD8 T cells during viral infections. STAT4 promotes T cell expansion and resistance to IFN-induced proliferation inhibition.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- Type 1 interferons (IFNs) regulate immune responses by activating signal transducers and activators of transcription (STATs).
- STAT1-dependent pathways mediate Type 1 IFN-induced inhibition of cell proliferation.
- STAT4 is also activated by Type 1 IFNs, but its role in CD8 T cell responses is less understood.
Purpose of the Study:
- To investigate the differential roles of STAT1 and STAT4 in CD8 T cell responses to Type 1 IFNs during viral infections.
- To elucidate the mechanism by which STAT4 influences CD8 T cell proliferation and function in the context of Type 1 IFN signaling.
Main Methods:
- Analysis of STAT1 and STAT4 expression in CD8 T cells from mice infected with lymphocytic choriomenigitis virus (LCMV).
- Assessment of Type 1 IFN signaling pathway activation in CD8 T cells.
- Evaluation of T cell receptor (TCR) stimulation effects on STAT expression.
- Examination of STAT4's role in CD8 T cell expansion and proliferation using genetic manipulation.
Main Results:
- CD8 T cells responding to LCMV infection exhibit elevated STAT4 and reduced STAT1 expression.
- Type 1 IFNs preferentially activate STAT4 over STAT1 in these activated CD8 T cells.
- TCR stimulation induces higher STAT4 expression.
- STAT4 is essential for optimal expansion of antigen-specific CD8 T cells and resistance to Type 1 IFN-mediated proliferation inhibition.
Conclusions:
- STAT4 acts as a critical regulator of Type 1 IFN effects in CD8 T cells during viral infections.
- STAT4 promotes antigen-specific CD8 T cell expansion by overcoming STAT1-dependent inhibition of proliferation.
- This identifies a mechanism for modulating Type 1 IFN responses in CD8 T cells.
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