Current status of small-bowel transplantation

Area of Science:

• Transplantation immunology
• Gastroenterology
• Surgical innovation

Background:

• Small-intestinal transplantation is a potential life-saving option for patients with extensive small bowel loss requiring total parenteral nutrition.
• Significant challenges, including rejection and graft-versus-host disease, have historically limited its clinical application.

Purpose of the Study:

• To review experimental findings and strategies for overcoming obstacles in small-bowel transplantation.
• To assess the current understanding and future prospects of clinical small-bowel transplantation.

Main Methods:

• Immunosuppressive protocols involving cyclosporine, azathioprine, prednisone, antithymocyte globulin, and monoclonal antibodies were investigated for rejection control.
• In vitro x-irradiation (1000 rads) of the graft was employed to eliminate graft-versus-host disease.
• Graft monitoring strategies combining function tests (e.g., maltose absorption) and biopsy were evaluated.
• Short-term graft preservation techniques using hypothermic storage and specific electrolyte solutions were explored.

Main Results:

• Effective immunosuppression regimens have been developed to manage rejection.
• Graft-versus-host disease can be prevented through graft irradiation.
• Functional and histological monitoring methods are available for intestinal allografts.
• Short-term preservation of small bowel grafts is feasible.

Conclusions:

• While not yet an imminent therapy, small-bowel transplantation shows promise based on experimental data and advances in transplantation biology.
• Clinical trials in carefully selected patients may be considered, building upon current knowledge and successes in related transplants (e.g., combined pancreatic-duodenal grafts).