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Immobilized anti-TCR mAb induces split functions in a CD8+ CTL clone
1Department of Microbiology, Kurume University School of Medicine, Fukuoka, Japan.
Cellular Immunology
|January 1, 1994
Summary
T-cell receptor (TCR) signaling without co-stimulation can induce anergy in CD8+ cytotoxic T lymphocytes (CTLs). This unresponsiveness affects proliferation and cytokine production but not target cell lysis, suggesting distinct TCR signaling pathways.
Area of Science:
- Immunology
- Cellular immunology
- T cell biology
Background:
- T cell receptor (TCR) signaling is crucial for adaptive immunity.
- CD4+ T helper (Th) 1 cells anergize without co-stimulation, unlike Th2 cells.
- The anergic potential of CD8+ cytotoxic T lymphocytes (CTLs) remains less understood.
Purpose of the Study:
- To investigate whether CD8+ CTLs can be rendered anergic by TCR stimulation alone.
- To determine the functional consequences of TCR-induced anergy in CD8+ CTLs.
Main Methods:
- Utilized a CD8+ CTL clone lacking IL-2 production.
- Applied immobilized anti-TCR monoclonal antibody (mAb) without secondary co-stimulation.
- Assessed proliferation, cytokine production, and target cell lysis upon subsequent antigen stimulation.
Main Results:
- Immobilized anti-TCR mAb treatment induced a non-proliferative state in CD8+ CTLs.
- Antigen stimulation after anti-TCR mAb treatment resulted in significantly reduced cytokine production.
- The CTL clone's ability to lyse target cells was retained despite anergy induction.
Conclusions:
- TCR signaling alone can induce functional unresponsiveness in CD8+ CTLs.
- Distinct intracellular signaling pathways mediate CTL proliferation, cytokine production, and cytotoxic activity.
- Understanding these pathways is key for modulating T cell responses in immunotherapy.