Requirement for T-cell apoptosis in the induction of peripheral transplantation tolerance
Summary
This summary is machine-generated.Peripheral tolerance induction requires T-cell deletion. Blocking T-cell apoptosis via cytokine withdrawal or activation-induced cell death prevents transplantation tolerance, highlighting deletion
Area Of Science
- Immunology
- Transplantation Science
- Cellular Biology
Background
- Allograft tolerance mechanisms include deletion, anergy, ignorance, and suppression/regulation.
- Central tolerance involves T-cell deletion, while peripheral tolerance is linked to anergy and/or regulatory states.
Purpose Of The Study
- To investigate the necessity of T-cell deletion in peripheral tolerance induction.
- To assess the role of both passive and active T-cell apoptotic pathways in transplantation tolerance.
Main Methods
- Utilized two mouse models: Bcl-xL transgenic mice (resistant to passive cell death) and interleukin-2-deficient mice (lacking activation-induced cell death).
- Employed agents blocking co-stimulatory pathways and the immunosuppressive drug rapamycin.
- Assessed the impact of defective apoptotic pathways on the induction of transplantation tolerance.
Main Results
- Mice with impaired passive T-cell death (Bcl-xL transgenic) and active T-cell death (interleukin-2 deficient) resisted transplantation tolerance induction.
- Rapamycin blocked proliferation but not priming for activation-induced cell death.
- Defects in T-cell apoptotic pathways rendered mice resistant to tolerance induction.
Conclusions
- T-cell deletion through activation-induced cell death or growth factor withdrawal is essential for achieving peripheral tolerance.
- Peripheral tolerance across major histocompatibility complex barriers necessitates effective T-cell apoptotic mechanisms.
View abstract on PubMed