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Updated: Mar 13, 2026
08:41
Functional Characterization of Regulatory Macrophages That Inhibit Graft-reactive Immunity
Published on: June 7, 2017
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Natural killer cell subsets in allograft rejection and tolerance
Maria-Luisa Alegre1, Megan E McNerney
1The University of Chicago, Department of Medicine, Chicago, Illinois, USA.
Current Opinion in Organ Transplantation
|February 1, 2007
Summary
Natural killer cells play a dual role in organ transplantation, potentially promoting rejection or aiding tolerance. Their impact depends on MHC specificity and therapeutic interventions, influencing graft survival.
Area of Science:
- Immunology
- Transplantation Biology
Background:
- Natural killer (NK) cells are immune cells with critical roles in host defense and immune regulation.
- Their function in transplantation is complex, influencing both graft rejection and acceptance.
Purpose of the Study:
- To review the multifaceted role of natural killer cells in regulating the survival of transplanted organs.
- To explore how NK cell activity impacts transplantation outcomes.
Main Methods:
- Review of existing literature on natural killer cell function in murine and human transplantation models.
- Analysis of studies investigating NK cell subsets, MHC specificity, and costimulation-targeting therapies.
Main Results:
- Natural killer cells exhibit a dual capacity, capable of promoting allograft rejection or being essential for transplantation tolerance.
- NK cell subsets can either delay or promote rejection based on their MHC class I specificity.
- In specific therapeutic contexts, NK cells are crucial for long-term graft acceptance, potentially by eliminating immune cells.
Conclusions:
- The outcome of NK cell activity in transplantation is highly context-dependent, influenced by MHC disparities and therapeutic strategies.
- Specific NK cell subsets may be key targets for inducing immune tolerance in clinical transplantation.
- Immunosuppressive regimens can modulate NK cell activity, impacting graft survival and tolerance.
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