Small-bowel transplantation in the rat with a nonsuture cuff technique. Technical and immunological considerations.

Small-bowel transplantation (SBT) using an nonsuture cuff technique was carried out on 137 rats. Preparation of the donor graft was carried out according to conventional procedures. Graft perfusion was done at a fixed pressure of 35 cm water. The left renal vessels of the recipient were dissected, the native kidney removed, and the graft was connected to the vessels by a nonsuture cuff technique. Of the animals, 92% survived for at least 5 days posttransplant. Three different combinations were investigated: (1) isografts; (2) semisyngeneic grafts from nontreated Lewis----(Lewis x DA) F1 hybrids; and (3) semisyngeneic grafts from rabbit antilymphocyte globulin (ALG)-pretreated Lewis----(Lewis x DA) F1. In group 1, 80% of the grafts were unaffected after 1 month; flow studies showed slight or no impairment of circulation in the graft. In group 2, the recipients developed clinical signs of graft-versus-host disease (GVHD) after 1 week, and at the end of the 2nd week the animals showed signs of severe illness, leading to death due to GVHD. There was also a higher percentage of complications in this group. In group 3, 65% of the animals died. However, 27% showed intact grafts and no signs of GVDH after 1 month, indicating that antibody pretreatment of the donor may successfully prevent GVHD SBT.