Efficacy of RS-61443 in reversing acute rejection in a rat model of hindlimb allotransplantation.

Abstract:

:The requirement for effective, minimally toxic immunosuppression remains a major obstacle to performing human composite tissue allotransplantation. The skin component of composite tissue (e.g., limb) allografts is especially antigenic, necessitating toxic immunosuppressant doses to prevent or reverse acute rejection. In previous experiments, RS-61443, an experimental mycophenolic acid ester that inhibits lymphocyte proliferation with minimal toxicity, prevented acute limb allograft rejection in rats for more than 8 months when started on the day of transplantation. In this study, the ability of RS-61443 to reverse established acute rejection was tested in a rat model of hindlimb allotransplantation. Brown-Norway donors and Fischer 344 recipients provided a MHC mismatch for orthotopic midfemur limb transplants that were performed with microsurgical repair of femoral vessels and sciatic nerve. Three groups were studied: untreated allografts (n = 6); allografts receiving RS-61443 at 30 mg/kg/day, started on postoperative day 7 (n = 11); and allografts receiving RS-61443 at 30 mg/kg/day, started on postoperative day 9 (n = 9). Skin and soft tissues were biopsied periodically to assess rejection. Untreated allografts had complete acute rejection within 12-13 days. Animals in both the 7- and 9-day groups developed moderate to severe rejection clinically and histologically before initiation of immunosuppressive therapy. In both groups, RS-61443 was able to reverse rejection completely in all animals from which biopsies were obtained at the time of death at 9-16 weeks after transplantation (P < 0.007). RS-61443 was highly effective as a primary immunosuppressant for reversing established acute rejection in rat hindlimb allografts.

journal_name

Transplantation

journal_title

Transplantation

authors

van den Helder TB,Benhaim P,Anthony JP,McCalmont TH,Mathes SJ

doi

10.1097/00007890-199402150-00020

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

427-33

issue

3

eissn

0041-1337

issn

1534-6080

journal_volume

57

pub_type

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