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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-4 induces CD22 expression to restrain the effector program of virtual memory T cells.
Bin Yang1, Ophélie Piedfort1, Guillem Sanchez-Sanchez2,3,4
1Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine - FARAH, University of Liège, Liège, Belgium.
Science Immunology
|February 7, 2025
Summary
Parasitic helminths trigger interleukin-4 (IL-4) to expand virtual memory CD8+ T cells (TVM cells). However, CD22 inhibits this IL-4-driven TVM cell activation and expansion.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Parasitic helminths stimulate interleukin-4 (IL-4) production.
- IL-4 promotes the expansion of virtual memory CD8+ T cells (TVM cells).
- TVM cells are crucial for controlling coinfections with intracellular pathogens.
Purpose of the Study:
- To elucidate the mechanisms governing IL-4-dependent TVM cell activation and expansion.
- To identify specific pathways and markers involved in TVM cell responses.
Main Methods:
- Single-cell RNA sequencing of CD8+ T cells.
- Gene signature analysis to identify cell clusters and surface markers.
- Investigated the role of CD22 in TVM cell function.
Main Results:
- A distinct CD22+ TVM cell cluster was identified as a marker of IL-4-induced TVM cells.
- CD22+ TVM cells exhibited enrichment for interferon-γ and granzyme A.
- CD22 intrinsically suppressed the IL-4-induced CD8+ T cell effector program, reducing TVM cell responsiveness and regulatory functions.
Conclusions:
- Helminth-induced IL-4 drives TVM cell expansion and activation.
- CD22 acts as a counterinhibitory mechanism, regulating IL-4-mediated TVM cell responses.
- Understanding CD22's role is key to modulating TVM cell-mediated immunity.
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