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Impaired regulatory T cell function in germ-free mice
Sofia Ostman1, Carola Rask, Agnes E Wold
1Department of Rheumatology and Inflammation Research, Göteborg University, Göteborg, Sweden. sofia.ostman@rheuma.gu.se
European Journal of Immunology
|August 10, 2006
Summary
The commensal microbiota promotes the development and function of regulatory T cells (Treg). Germ-free mice have fewer and less potent Treg cells, indicating a crucial role for gut microbes in immune tolerance.
Area of Science:
- Immunology
- Microbiome research
- Cellular immunology
Background:
- Regulatory T cells (Treg) are vital for maintaining immune tolerance to self and foreign antigens.
- The influence of commensal microbiota on Treg development and function remains an area of active investigation.
Purpose of the Study:
- To investigate the role of commensal microbiota in the development and function of Treg cells.
- To compare Treg cell phenotype and suppressive capacity in germ-free versus conventional mice.
Main Methods:
- Isolation of CD4+CD25+ T cells from peripheral and mesenteric lymph nodes of germ-free and conventional mice.
- Analysis of gene expression (Foxp3) and protein markers (Foxp3, CTLA-4) via intracellular staining.
- Assessment of in vitro functional suppressive capacity of Treg cells.
Main Results:
- Treg cells from germ-free mice exhibited lower Foxp3 gene expression and reduced in vitro suppressive capacity compared to conventional mice.
- Germ-free mice showed fewer Foxp3 and CTLA-4 expressing Treg cells in mesenteric lymph nodes and celiac lymph nodes.
- Proportional and regional differences in Treg subsets were observed between germ-free and conventional mice.
Conclusions:
- The presence of a microbial flora is essential for the development of fully functional Treg populations.
- Commensal microbiota significantly impacts Treg cell differentiation and distribution in lymphoid tissues.
- Microbiota-driven Treg development is crucial for maintaining immune homeostasis.