Related Experiment Videos
Long-lasting unresponsiveness to polyclonal T cell-binding immunoglobulins
1GSF-National Research Center for Environment and Health, Institute of Immunology, Munich, Germany.
European Journal of Immunology
|March 4, 1998
Summary
Mice developed long-lasting tolerance to foreign antibodies after CD4+ cell depletion. This tolerance is primarily mediated by specific B cell tolerance, not T cell unresponsiveness, and prolongs allogeneic skin graft survival.
Area of Science:
- Immunology
- Transplantation Immunology
Background:
- Acquired tolerance to foreign antigens is crucial for preventing immune rejection.
- Understanding the mechanisms of antibody tolerance is key to improving transplantation and immunotherapy.
Purpose of the Study:
- To investigate the mechanisms underlying acquired tolerance to foreign antibodies in mice.
- To determine the role of T cell subsets and B cell responses in this tolerance.
Main Methods:
- Mice were injected with anti-T cell monoclonal antibodies (mAbs) followed by rabbit anti-mouse thymocyte globulin (RbATG).
- CD4+ cell depletion was assessed, alongside antibody responses to RbATG and control antigens (BSA).
- In vitro spleen cell restimulation and in vivo allogeneic skin graft survival were analyzed.
Main Results:
- Depletion of CD4+ T cells was essential for inducing tolerance to RbATG.
- Tolerance involved specific B cell tolerance, suppressing anti-RbATG antibodies but not anti-BSA antibodies.
- T cell unresponsiveness played a minor role; tolerance did not involve Th1/Th2 skewing.
- Pretreatment with anti-T cell mAbs followed by RbATG significantly prolonged allogeneic skin graft survival.
Conclusions:
- Acquired tolerance to foreign polyclonal T cell-binding immunoglobulins is primarily mediated by B cell tolerance.
- CD4+ T cell depletion is critical for inducing this humoral unresponsiveness.
- This finding has implications for managing immune responses in transplantation and immunotherapy.