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Updated: Jan 11, 2026
01:24
Nephrotic Syndrome I : Introduction
Published on: June 19, 2025
476
Immunosuppression in islet transplantation.
Tom Van Belle1, Matthias von Herrath
1La Jolla Institute for Allergy and Immunology, La Jolla, California 92037, USA.
The Journal of Clinical Investigation
|April 24, 2008
Summary
Islet transplantation for type 1 diabetes causes T cell expansion due to immune conditioning. This homeostatic expansion of autoreactive T cells may lead to long-term graft failure, necessitating new therapeutic strategies.
Area of Science:
- Immunology
- Endocrinology
- Transplantation
Background:
- Islet transplantation offers a potential cure for type 1 diabetes mellitus (T1DM).
- Current protocols require immunosuppression to prevent graft rejection.
- Long-term graft survival remains a challenge in T1DM islet transplantation.
Purpose of the Study:
- To investigate the immunological consequences of the Edmonton protocol for islet transplantation in T1DM patients.
- To identify mechanisms contributing to long-term islet graft failure.
Main Methods:
- Analysis of immune conditioning effects in T1DM patients undergoing islet transplantation.
- Assessment of T cell populations and cytokine levels post-transplantation.
Main Results:
- The Edmonton protocol induces lymphopenia.
- Lymphopenia is associated with increased homeostatic cytokines IL-7 and IL-15.
- Elevated cytokines promote in vivo expansion of autoreactive CD8(+) T cells.
Conclusions:
- Recurrent autoreactivity driven by homeostatic T cell expansion may be a primary cause of long-term islet graft failure.
- Novel strategies are needed to prevent homeostatic expansion and T cell autoreactivity in T1DM islet transplantation.
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