Thymic CCL2 influences induction of T-cell tolerance
O Cédile1, M Løbner1, H Toft-Hansen1
1Institute of Molecular Medicine, Department of Neurobiology Research, University of Southern Denmark, J.B. Winsløwsvej 25, DK-5000 Odense C, Denmark.
Journal of Autoimmunity
|August 18, 2014
Summary
The thymus constitutively expresses CCL2, a chemokine that regulates dendritic cell (DC) numbers and T cell development. Overexpressing CCL2 in the thymus prevents autoimmune diseases like experimental autoimmune encephalomyelitis (EAE).
Area of Science:
- Immunology
- Developmental Biology
- Autoimmunity
Background:
- Thymic epithelial cells (TEC) and dendritic cells (DC) are crucial for T cell development and immune tolerance.
- DC migration to the thymus is chemokine-driven, influencing T cell selection and autoimmune disease susceptibility.
- CCL2 (chemokine (C-C motif) ligand 2) and its receptor CCR2 are implicated in autoimmune conditions like experimental autoimmune encephalomyelitis (EAE).
Purpose of the Study:
- To investigate the role of CCL2 in thymic immune cell homeostasis and T cell development.
- To determine the impact of CCL2 overexpression in the thymus on DC populations and T cell maturation.
- To assess the effect of thymic CCL2 expression on susceptibility to experimental autoimmune encephalomyelitis (EAE).
Main Methods:
- Constitutive expression of CCL2 in thymic endothelial cells and TEC was analyzed.
- Transgenic mice overexpressing CCL2 in the thymus were generated.
- Flow cytometry was used to quantify thymic DC subsets and T cell populations.
- EAE induction was performed in CCL2 transgenic and wild-type mice to assess disease susceptibility.
Main Results:
- CCL2 is constitutively expressed by thymic endothelial cells and TEC.
- CCL2 transgenic mice exhibited increased numbers of thymic plasmacytoid DC.
- T cell development was significantly impaired in CCL2 transgenic mice.
- CCL2 transgenic mice showed resistance to EAE induction.
Conclusions:
- Thymic CCL2 expression regulates DC homeostasis and T cell development.
- CCL2 plays a critical role in controlling the development of autoreactive T cells.
- Modulating thymic CCL2 may offer a therapeutic strategy for preventing autoimmune diseases.
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