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The Journal of Immunology, Vol 155, Issue 4 1655-1659, Copyright © 1995 by American Association of Immunologists

CUTTING EDGE

Induction of tolerance to heart allografts in high responder rats by combining anti-CD4 with CTLA4Ig

D Yin and CG Fathman
Department of Medicine, Stanford University School of Medicine, CA 94305, USA.

It has been difficult to induce donor-specific transplantation tolerance in high responder Lewis rats. Results presented below demonstrate that amounts of pretransplant anti-CD4 sufficient to allow allograft tolerance in low responder strains (5 mg/kg x 4 days) did not prevent the acute rejection of ACI heart allografts in high responder Lewis recipients. Higher doses of pretransplant anti-CD4 (10 mg/kg, 15 mg/kg, and 20 mg/kg) given alone could delay but not prevent allograft rejection. Pretransplant anti-CD4 combined with anti-CD8, thymectomy, and total lymphoid irradiation all failed to produce tolerance to ACI heart allografts. However, a regimen of anti-CD4 combined with CTLA4Ig allowed indefinite survival of ACI heart allografts (mean survival time, > 100 day). Second-donor matched heart grafts were permanently accepted, and third-party heart grafts were permanently accepted, and third-party heart allografts were rejected by the tolerant recipients. These results suggest a new combination therapeutic strategy for clinical transplantation.


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