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Prenatal tolerance--a role for regulatory T cells?
1Sir William Dunn School of Pathology, University of Oxford, Oxford, UK.
European Journal of Immunology
|February 1, 2005
Summary
Functional regulatory T cells (TR cells) are present in the human fetus, found in various organs from 14 weeks gestation. These cells, crucial for immune tolerance, exhibit location-dependent phenotypes, impacting understanding of prenatal self-reactivity.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- Regulatory T cells (TR cells) are critical for maintaining immune homeostasis and preventing autoimmunity.
- Their presence and function during early human development remain largely unexplored.
- Understanding fetal immune development is key to addressing childhood immune-related pathologies.
Purpose of the Study:
- To investigate the occurrence and characteristics of regulatory T cells (TR cells) in the human fetus.
- To determine the presence of functional TR cells in fetal organs beyond cord blood.
Main Methods:
- Analysis of fetal thymus, spleen, lymph node, and cord blood samples.
- Identification of CD4+CD25+ TR cells.
- Detection of FoxP3 RNA as a marker for naturally arising TR cells.
Main Results:
- Functional CD4+CD25+ TR cells were identified in fetal thymus, spleen, and lymph nodes from 14 weeks of gestation.
- FoxP3 RNA, a marker for TR cells, was detected in these fetal organs.
- Fetal TR cells displayed phenotypic variations based on their anatomical location, suggesting differential activation states.
Conclusions:
- Regulatory T cells are present and functional in the human fetus early in development.
- The early emergence of TR cells raises questions about prenatal immune tolerance mechanisms.
- These findings have potential implications for understanding and managing childhood immune disorders.