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Lunatic fringe controls T cell differentiation through modulating notch signaling
Shin-ichi Tsukumo1, Kayo Hirose, Yoichi Maekawa
1Department of Immunology and Parasitology, Institute of Health Biosciences, University of Tokushima Graduate School, 3-18-15 Kuramoto, Tokushima 770-8503, Japan.
Journal of Immunology (Baltimore, Md. : 1950)
|December 5, 2006
Summary
Lunatic fringe (Lfng) regulates T cell development by modulating Notch signaling. Its expression dynamics are crucial for transitioning from immature to mature T cells, impacting differentiation and development.
Area of Science:
- Immunology
- Developmental Biology
- Molecular Biology
Background:
- T cell differentiation from hematopoietic stem cells involves stage-specific gene expression.
- Lunatic fringe (Lfng) is a Notch signaling modulator with dynamic expression during T cell development.
Purpose of the Study:
- To investigate the role of Lfng expression changes in T cell development.
- To determine if Lfng acts as a positive regulator of Notch signaling in T cells.
Main Methods:
- cDNA subtraction to identify genes highly expressed in mature CD8 single-positive (SP) T cells compared to double-positive (DP) T cells.
- Reporter gene assays to assess Notch signaling strength with Lfng overexpression in Jurkat T cells.
- In vivo studies involving enforced expression or down-regulation of Lfng in thymocytes and fetal liver-derived hematopoietic stem cells.
Main Results:
- Lfng expression is low in DP cells and high in double-negative (DN), CD4SP, and CD8SP T cells.
- Overexpression of Lfng in Jurkat T cells enhances Notch signaling.
- Enforced Lfng expression in thymocytes promotes immature CD8SP cells but reduces mature SP cells.
- Lfng down-regulation in thymocytes impairs DP cell development and DN cell transition.
- Lfng overexpression in hematopoietic stem cells enhances T cell development, while down-regulation suppresses it.
Conclusions:
- Physiological high Lfng expression in DN cells enhances T cell differentiation via Notch signaling.
- Reduced Lfng expression in DP cells is critical for promoting differentiation into mature SP T cells.
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