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Related Experiment Video

Updated: Feb 2, 2026

Murine Corneal Transplantation: A Model to Study the Most Common Form of Solid Organ Transplantation

Murine Corneal Transplantation: A Model to Study the Most Common Form of Solid Organ Transplantation

Published on: November 17, 2014

T cell Allorecognition Pathways in Solid Organ Transplantation.

Jacqueline H Y Siu¹, Veena Surendrakumar¹, James A Richards¹

¹Department of Surgery, University of Cambridge, Cambridge, United Kingdom.

Frontiers in Immunology

|November 21, 2018

Summary

This summary is machine-generated.

T cells recognize transplanted organs through direct and indirect pathways, influencing acute and chronic rejection. New insights suggest these pathways, including the semi-direct pathway, are key to understanding and improving transplant outcomes.

Keywords:

T cell allorecognition T follicular helper cell chronic allograft vasculopathy cytotoxic CD8 T cells exhaustion germinal center indirect presentation transplantation

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Area of Science:

Immunology
Transplantation Biology

Background:

T cells recognize alloantigens via direct (intact MHC) and indirect (processed) pathways.
Conventional views on direct (acute rejection) and indirect (chronic rejection) pathways lack robust experimental support.
The semi-direct pathway, involving recipient dendritic cells re-presenting donor MHC, challenges existing models.

Purpose of the Study:

To review advances in understanding T cell allorecognition pathways.
To assess the contribution of these pathways to effector alloantibody and cytotoxic CD8 T cell responses.
To discuss therapeutic strategies informed by this knowledge for improving transplant outcomes.

Main Methods:

Review of recent research on T cell allorecognition pathways.
Analysis of effector alloantibody and cytotoxic CD8 T cell generation.
Assessment of pathway contributions to early and late allograft rejection.

Main Results:

Acute allograft rejection involves both direct and indirect pathway CD4 T cell responses.
Chronic allograft rejection is primarily mediated by indirect pathway CD4 T cell responses.
The role of direct pathway recognition of cross-dressed MHC class II in chronic rejection requires further investigation.

Conclusions:

Understanding T cell allorecognition pathways is crucial for improving transplant outcomes.
Therapeutic strategies may involve induced regulatory T cells and immunometabolic modulation.
Precise characterization of late indirect pathway responses can guide personalized cellular therapies.