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  • Title: Morphologic features of rejection in long-surviving canine small bowel transplants.
    Author: Banner B, Dean P, Williams J.
    Journal: Transplantation; 1988 Nov; 46(5):665-9. PubMed ID: 3194938.
    Abstract:
    We studied morphologic features of small bowel transplants in 25 dogs immunosuppressed by cyclosporine, and preoperative graft irradiation. Graft and host bowel were compared with respect to multiple histologic parameters in a blinded analysis. A lymphoplasmacytic infiltrate in nerves and vessels in submucosa and muscle was present in 18 graft bowels and only 3 host bowels, suggesting that these findings represent a cellular rejection reaction. The other histologic parameters were the same in graft and host bowel. Although the dogs did not exhibit clinical signs of rejection, end-stage scarring of the bowel and death occurred in 6 dogs. The animals did not develop systemic graft-verus-host reaction. These findings indicate that under cyclosporine therapy, a subclinical rejection reaction persists deep in the wall and may remain undetectable in mucosal biopsies, but may progress to destroy the graft.
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