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Published on: May 10, 2022
The CD46-Jagged1 interaction is critical for human TH1 immunity
Gaëlle Le Friec1, Devon Sheppard, Pat Whiteman
1Division of Transplantation Immunology and Mucosal Biology, MRC Centre for Transplantation, King's College London, Guy's Hospital, London, UK.
The immune system uses CD46 to regulate T helper type 1 (T(H)1) cells. This study reveals CD46 interacts with Jagged1, a Notch ligand, crucial for T(H)1 cell function and preventing infections.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- CD46 is a complement regulator involved in immune responses, acting as a pathogen receptor and costimulator for T helper type 1 (T(H)1) cells.
- CD46 influences the induction of interferon-γ (IFN-γ) and the subsequent switch to interleukin 10 (IL-10)-producing regulatory T cells.
Purpose of the Study:
- To identify physiological ligands for CD46.
- To investigate the role of CD46-Notch pathway interactions in T cell activation and immune response regulation.
- To determine the clinical relevance of CD46-Jagged1 crosstalk in patients with immune deficiencies.
Main Methods:
- Identification of Jagged1 as a CD46 ligand using biochemical and cellular assays.
- Analysis of CD46's regulation of Notch receptors and ligands during T cell activation.
- Assessment of T(H)1 responses in CD46-deficient patients and patients with Jagged1 mutations (Alagille syndrome) in vitro and in vivo.
Main Results:
- Jagged1 was identified as a physiological ligand for CD46.
- CD46 was shown to regulate Notch receptor and ligand expression during T cell activation.
- Disruption of CD46-Notch crosstalk impaired IFN-γ induction and the switch to IL-10 production.
- CD4(+) T cells from CD46-deficient patients and Alagille syndrome patients exhibited defective T(H)1 responses.
Conclusions:
- CD46-Jagged1 crosstalk is a critical pathway for proper T(H)1 cell induction and regulation.
- This crosstalk is essential for mounting effective immune responses against pathogens.
- Dysfunctional CD46-Jagged1 signaling contributes to recurrent infections observed in specific patient populations.
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