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Induction of Alloantigen-specific Anergy in Human Peripheral Blood Mononuclear Cells by Alloantigen Stimulation with Co-stimulatory Signal Blockade

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Costimulation Blockade in Transplantation.

Melissa Y Yeung^1,2, Tanja Grimmig³, Mohamed H Sayegh^4,5,6

¹Department of Medicine, Renal Division, Brigham and Women's Hospital, Boston, MA, USA. myeung@rics.bwh.harvard.edu.

Advances in Experimental Medicine and Biology

|November 24, 2019

Summary

T-cell costimulation is crucial for immune responses to foreign grafts. Manipulating these complex pathways, whether by blocking positive signals or promoting negative ones, offers therapeutic strategies to prevent graft rejection and induce tolerance.

Keywords:

Allograft Alloimmune Belatacept Costimulation blockade Tolerance Transplant

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Induction of Alloantigen-specific Anergy in Human Peripheral Blood Mononuclear Cells by Alloantigen Stimulation with Co-stimulatory Signal Blockade

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Area of Science:

Immunology
Transplantation immunology
T-cell biology

Background:

T cells are key players in allogeneic graft immune responses.
T-cell activation requires T-cell receptor (TCR) interaction with MHC-peptide complexes and a second costimulatory signal.
Absence of costimulation leads to T-cell anergy or deletion, while costimulatory molecules can also provide inhibitory signals.

Purpose of the Study:

To summarize current knowledge of T-cell costimulatory pathways in transplantation.
To review the challenges and opportunities in targeting these pathways for therapeutic purposes.
To explore strategies for promoting graft tolerance by modulating T-cell costimulation.

Main Methods:

Review of existing literature on T-cell costimulation in transplantation.
Analysis of the complex interactions of costimulatory molecules.
Discussion of therapeutic strategies targeting costimulatory pathways.

Main Results:

Blocking positive costimulatory signals can prevent graft rejection and promote allograft survival.
Promoting negative costimulatory (coinhibitory) pathways can also lead to graft tolerance.
The complexity of T-cell costimulation involves simultaneous or sequential interactions with varying importance.

Conclusions:

T-cell costimulatory pathways present both challenges and opportunities for therapeutic intervention in transplantation.
Understanding the balance between destructive effector T cells and regulatory T cells is critical for allograft fate.
Harnessing costimulatory pathways offers a promising avenue for achieving long-term graft tolerance.