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Glucocorticoid-mediated regulation of thymic dendritic cell function
R Sacedón1, A Vicente, A Varas
1Department of Cell Biology, Faculty of Biology, Complutense University, 28040 Madrid, Spain.
International Immunology
|July 28, 1999
Summary
Glucocorticoids (GC) affect thymic dendritic cells (DC) by reducing their stimulatory capacity and cytokine production. This study reveals GC receptor expression on thymic DCs, suggesting a regulatory role in T cell selection.
Area of Science:
- Immunology
- Endocrinology
Background:
- Glucocorticoids (GC) and thymic dendritic cells (DC) are implicated in intrathymic T cell selection.
- The precise relationship between GC and thymic DC biology remains largely unexplored.
Purpose of the Study:
- To investigate the effects of glucocorticoids on thymic dendritic cells.
- To determine if thymic DCs express GC receptors and how GC treatment impacts their function.
Main Methods:
- Analysis of GC receptor expression in thymic DCs.
- In vitro treatment of mature thymic DCs with dexamethasone (Dex).
- Assessment of DC viability, surface molecule expression, cytokine production (IL-1beta, TNF-alpha, IL-6, IL-10), and allostimulatory properties.
Main Results:
- Thymic DCs express GC receptors and are resistant to dexamethasone-induced apoptosis.
- Dex treatment slightly reduces adhesion and co-stimulatory molecule expression on DCs.
- Dexamethasone diminishes IL-1beta and TNF-alpha production by DCs but not IL-6 or IL-10.
- Reduced allostimulatory capacity of Dex-treated DCs was not restored by adding IL-1beta and TNF-alpha.
Conclusions:
- Glucocorticoids modulate the activity of thymic dendritic cells.
- These findings suggest a GC-mediated regulatory mechanism influencing thymic DC function, potentially impacting T cell selection within the thymus.