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Updated: Feb 17, 2026
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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
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IL-7-dependent STAT1 activation limits homeostatic CD4+ T cell expansion
Cecile Le Saout1, Megan A Luckey2, Alejandro V Villarino3
1CMRS/Laboratory of Immunoregulation, NIAID.
JCI Insight
|December 5, 2017
Summary
Interleukin-7 (IL-7) signaling shifts from STAT5 to STAT1/STAT5 activation during lymphopenia, altering T cell gene expression and survival. This pathway may be dysregulated in HIV infection.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- Interleukin-7 (IL-7) is crucial for maintaining T cell pool homeostasis throughout life.
- Under steady-state conditions, IL-7 signaling primarily involves signal transducer and activator of transcription 5 (STAT5).
Purpose of the Study:
- To investigate the mechanisms of IL-7 signaling under lymphopenic conditions.
- To understand the role of STAT1 in IL-7-mediated T cell responses during lymphopenia-induced proliferation (LIP).
Main Methods:
- Analysis of IL-7 signaling pathways, including STAT1 and STAT5 activation.
- Transcriptome analysis to identify IL-7-induced gene expression changes.
- Assessment of CD4+ T cell survival during LIP.
Main Results:
- Lymphopenia induces STAT1 expression, leading to co-activation of STAT1 and STAT5 by IL-7.
- The IL-7-induced transcriptome shifts, showing enrichment of interferon-stimulated genes (ISGs).
- STAT1 overexpression correlates with reduced CD4+ T cell survival during LIP.
Conclusions:
- T cells undergoing LIP upregulate STAT1, activating an alternative IL-7-dependent program that regulates T cell pool expansion.
- This STAT1-mediated pathway could be exploited during HIV infection, contributing to T cell homeostatic dysregulation.
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