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Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
Published on: November 8, 2016
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Dexamethasone affects day/night development and function of thymus-derived T regulatory cells
Ewelina Kiernozek1, Anna Bieńkowska1, Magdalena Markowska2
1Faculty of Biology, University of Warsaw, Department of Immunology, Miecznikowa 1, 02-096 Warsaw, Poland.
Immunobiology
|August 21, 2019
Summary
Synthetic glucocorticoids like dexamethasone impact thymus-derived T regulatory (tTreg) cells. Dexamethasone influences tTreg development and function differently in male and female mice, depending on administration time, suggesting a need for careful therapeutic timing.
Area of Science:
- Immunology
- Endocrinology
- Chronobiology
Background:
- Thymus-derived T regulatory (tTreg) cells are vital for immune tolerance and homeostasis.
- While their regulation is studied, mechanisms remain unclear.
- Previous research indicated diurnal rhythms in tTreg development and function, linked to corticosterone and glucocorticoid receptors.
Purpose of the Study:
- To investigate if synthetic glucocorticoids (dexamethasone) modulate tTreg development and function in vivo.
- To determine if the timing of dexamethasone administration affects these modulations.
- To assess potential adverse effects and establish a model for long-term therapy evaluation.
Main Methods:
- Young male and female C57BL/6 mice were used.
- A single intraperitoneal dose of dexamethasone was administered at 7-8 a.m. or 7-8 p.m.
- Changes in tTreg percentage and suppressive activity were analyzed.
Main Results:
- Dexamethasone increased the percentage of tTregs in males at both times, but only in females during the evening.
- tTreg suppressive activity increased in females regardless of administration time, but only in the morning for males.
- Elevated tTreg suppressive potential was counterbalanced by induced apoptosis to prevent excessive immune suppression.
Conclusions:
- Dexamethasone's effects on tTreg cells exhibit sex- and time-dependent variations.
- The timing of glucocorticoid administration is critical for modulating tTreg cell activity.
- Apoptosis induction balances increased tTreg suppressive potential, preventing detrimental over-suppression.
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