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Published on: March 17, 2020
The pathophysiology of chronic graft-versus-host disease: the unveiling of an enigma
1Division of Hematology, Department of Internal Medicine, The Catholic University of Korea, Seoul, Korea.
Insights
Chronic graft-versus-host disease (CGVHD) is a major complication after allogeneic hematopoietic stem cell transplantation (allo-HSCT). Understanding CGVHD pathogenesis and utilizing validated diagnostic criteria are key to improving patient outcomes.
Area of Science:
- Immunology
- Hematology
- Transplantation Medicine
Background:
- Chronic graft-versus-host disease (CGVHD) is a significant complication for long-term survivors of allogeneic hematopoietic stem cell transplantation (allo-HSCT).
- CGVHD presents diverse clinical manifestations, posing diagnostic and therapeutic challenges.
- Current diagnostic recommendations focus on qualitative differences rather than onset time, requiring further validation.
Purpose of the Study:
- To review recent clinical advancements in CGVHD diagnosis and management.
- To elucidate the complex pathogenesis of CGVHD, including cellular and cytokine networks.
- To discuss the role of animal models in developing prevention and treatment strategies for CGVHD.
Main Methods:
- Review of experimental studies and clinical observations on CGVHD.
- Analysis of proposed pathophysiological theories for CGVHD, including thymic damage, regulatory T cell deficiencies, auto-antibody production, and profibrotic lesions.
- Evaluation of insights gained from mouse models of CGVHD.
Main Results:
- While mechanisms of acute GVHD are better understood, CGVHD biology remains less clear.
- Four main theories explain CGVHD pathophysiology: thymic damage, Treg deficiency, B-cell auto-antibody production, and profibrotic lesions.
- Animal models have provided valuable insights but do not fully replicate human CGVHD.
Conclusions:
- Accurate diagnosis and understanding of CGVHD pathogenesis are crucial for improving outcomes after allo-HSCT.
- Further validation of new diagnostic criteria is needed.
- Continued research, including the use of animal models, is essential for developing effective CGVHD prevention and treatment strategies.
Abstract:
Chronic graft-versus-host disease (CGVHD) is one of the most significant complications of long-term survivors after allogeneic hematopoietic stem cell transplantation (allo-HSCT). CGVHD may have protean manifestations and can pose unique diagnostic and therapeutic challenges. New recommendations that emphasize the importance of qualitative differences, as opposed to time of onset after HSCT, are now being used to standardize the diagnosis and clinical assessment of CGVHD, but they require validation. During the past 3 decades, experimental studies and clinical observations have elucidated the mechanisms of acute GVHD, but its biology is much less well-understood. Experimental studies have generated at least 4 theories to explain the pathophysiology of CGVHD: (1) thymic damage and the defective negative selection of T cells, (2) regulatory T cell deficiencies, (3) auto-antibody production by aberrant B cells, and (4) the formation of profibrotic lesions. Mouse models have provided important insights into the pathophysiology of CGVHD, and these have helped improve clinical outcomes following allo-HSCT, but no animal model fully replicates all of the features of CGVHD in humans. In this article, recent clinical changes, the pathogenesis of CGHVD, the cellular and cytokine networks implicated in its pathogenesis, and the animal models used to devise strategies to prevent and treat CGVHD are reviewed.
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