Pretreatment with Cyclosporine and Anti-Interleukin 2 Receptor Antibody Abrogates the Anti-Idiotype Response in Rat Recipients of Cardiac Allografts

• Published in: Proceedings of the National Academy of Sciences - PNAS 1990-10, Vol.87 (19), p.7375-7379
• Main Authors: Tanaka, Kazuo, Tilney, Nicholas L., Stunkel, Klaus G., Hancock, Wayne W., Diamantstein, Tibor, Kupiec-Weglinski, Jerzy W.
• Format: Article
• Language: English
• Subjects: Animals; Antibodies; Antibodies, Monoclonal - immunology; Antibodies, Monoclonal - therapeutic use; Biological and medical sciences; Cyclosporins; Cyclosporins - blood; Cyclosporins - pharmacology; Cyclosporins - therapeutic use; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Graft rejection; Graft Survival; Heart Transplantation - immunology; Homologous transplantation; Immunoglobulin Fab Fragments - immunology; Immunoglobulin Idiotypes - analysis; Immunoglobulin Idiotypes - immunology; Immunosuppression; Isotypes; Male; Pretreatment; Rats; Rats, Inbred Strains; Receptors; Receptors, Interleukin-2 - immunology; Receptors, Interleukin-2 - physiology; Tissue grafting; Transplantation; Transplantation, Homologous
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.87.19.7375

A 10-day course with ART-18, a mouse monoclonal antibody (mAb) directed against the rat interleukin 2 receptor (IL-2R), prolongs the survival of (LEW x BN)F1cardiac allografts in LEW recipients to ≈ 3 weeks (acute rejection = 8 days, P < 0.001). We examined host responses against ART-18 idiotype (Id) and mouse immunoglobulin in recipients immunomodulated with ART-18 mAb. Treatment with ART-18 elicited high titers of anti-Id antibodies 14 days after transplantation. However, naive rats given ART-18 before transplantation showed strong anti-Id responses as early as day 4 after engraftment, coinciding with abrogation of the treatment effect (graft survival, ≈ 10 days). Preimmunization with irrelevant mouse IgG, which elicited high titers of anti-IgG, did not influence the efficacy of ART-18 upon graft survival (17 days). The use of cyclosporin A(CsA) in conjunction with ART-18 prior to transplantation suppressed the anti-Id response and led to dramatic graft prolongation (>58 days), with two of five grafts surviving indefinitely. This striking effect of CsA plus ART-18 pretreatment did not depend upon CsA per se, as grafts were rejected within 12 days in animals pretreated with CsA alone; in both groups CsA trough levels were comparable. Moreover, administration of CsA before transplantation in concert with control IgG (instead of ART-18) prompted rejection within 2-4 weeks. Thus, discrete interaction(s) between anti-IL-2R mAb and CsA prior to engraftment induces partial host unresponsiveness/tolerance to anti-IL-2R mAb treatment following transplantation and suppresses the neutralizing anti-Id responses, which results in long-term/permanent graft acceptance. This study provides a strategy to overcome the anti-Id response mounted by graft recipients that otherwise limits the efficacy of anti-IL-2R mAb treatment.