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Glucocorticoids down-regulate dendritic cell function in vitro and in vivo
M Moser1, T De Smedt, T Sornasse
1Département de Biologie Moléculaire, Université Libre de Bruxelles, Rhode-Saint-Genèse, Belgium.
European Journal of Immunology
|October 1, 1995
Summary
Glucocorticoids, like dexamethasone, impair dendritic cell (DC) function. This study shows these hormones reduce DC viability and co-stimulatory molecule expression, impacting T cell activation and immune responses.
Area of Science:
- Immunology
- Endocrinology
- Cell Biology
Background:
- Glucocorticoids are used therapeutically and act as endogenous immunosuppressants.
- T cell activation requires antigen presentation and co-stimulatory signals from antigen-presenting cells.
- Dendritic cells (DCs) are crucial for initiating primary immune responses by activating naive T cells.
Purpose of the Study:
- To investigate the effect of glucocorticoids on the capacity of dendritic cells (DCs) to sensitize naive T cells.
- To determine how dexamethasone influences DC viability, co-stimulatory molecule expression, and immunostimulatory properties.
Main Methods:
- In vitro experiments assessing dexamethasone's impact on DC viability and co-stimulatory molecule expression.
- In vivo studies evaluating dexamethasone's effect on antigen-presenting function and splenic DC numbers after a single injection.
Main Results:
- Dexamethasone (Dex) reduced the viability of DCs in vitro.
- Dex selectively down-regulated co-stimulatory molecules on viable DCs, significantly reducing their immunostimulatory capacity.
- In vivo, a single Dex injection impaired DC antigen presentation and reduced splenic DC numbers.
Conclusions:
- Glucocorticoids regulate DC maturation and immune function both in vitro and in vivo.
- This regulation by glucocorticoids may serve as a mechanism to prevent immune system overstimulation.
- The findings highlight the role of glucocorticoids in modulating immune responses through dendritic cell function.