Abstract:
BACKGROUND:Small bowel transplantation remains a difficult therapeutic option endangered by a high rate of rejection and infectious complications. To improve these clinical results, it is mandatory to set up animal models to test alternative immunosuppressive regimens which may lead to immunotolerance. AIMS:To determine the value of blockade of alphaLbeta2 (LFA-1) and alpha4 and beta7 integrins (alpha4beta1, alpha4beta7, and alphaEbeta7) in the prevention of rejection of fetal small bowel grafts in mice and the effect of the association of calcineurin dependent drugs in anti-LFA-1 treated mice. METHODS:Adult recipient mice engrafted with allogeneic fetal small bowel received a short course of anti-alpha4 and/or anti-LFA-1 monoclonal antibodies (mAb) with or without FK506 or cyclosporin A. In addition, in a set of experiment, beta7-/- mice were used as recipients. Graft biopsies were performed and processed for standard histology. RESULTS:Blockade of the pathways of the integrins alpha4 and beta7 had a modest or no effect on intestinal graft survival. In contrast, transitory, short administration of anti-LFA-1 monoclonal antibody alone, when started before engraftment (day -1), allowed long term survival of intestinal grafts, even when associated with calcineurin dependent drugs. However, early withdrawal of FK506 reversed the immunosuppressive effect of anti-LFA-1 treatment. CONCLUSION:These results suggest that firstly, anti-LFA-1, but not anti-alpha4 mAb treatment, may be useful in improving the results of intestinal transplantation, and secondly, that this treatment is not incompatible with long term administration of tacrolimus currently used in the prevention of small bowel graft rejection in humans.
journal_name
Gutjournal_title
Gutauthors
Sarnacki S,Auber F,Crétolle C,Camby C,Cavazzana-Calvo M,Müller W,Wagner N,Brousse N,Révillon Y,Fischer A,Cerf-Bensussan Ndoi
10.1136/gut.47.1.97keywords:
subject
Has Abstractpub_date
2000-07-01 00:00:00pages
97-104issue
1eissn
0017-5749issn
1468-3288journal_volume
47pub_type
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