OBJECTIVES AND DESIGN: We determined in a rat model (1) the presence and dynamics of alloantibodies recognizing MHC complexes on quiescent Brown-Norway (BN) splenic cells in the sera of Lewis (LEW) recipients of Brown-Norway iliolumbar vein grafts under tacrolimus immunosuppression; and (2) the presence of immunoglobulins in the wall of acute rejected vein allografts. MATERIALS AND METHODS: Flow cytometry was used for the analysis of day 0, 14 and 30 sera obtained from Lewis recipients of isogeneic iliolumbar vein grafts (group A) or Brown-Norway grafts (group B, C) for the presence of donor specific anti-MHC class I and II antibodies. Tacrolimus 0.2 mg/kg daily was administered from day 1 to day 30 (group C). Histology was performed on day 30. RESULTS: Sera obtained preoperatively and on day 30 were compared in all groups. The statistically significant decrease of anti MHC class I and II antibody binding was observed only in allogenic non-immunosuppressed group B (splenocytes: MHC class I - day 0 (93% ± 7% ) vs day 30 (66% ± 7%), p = 0.02, MHC class II - day 0 (105% ± 3% ) vs day 30 (83% ± 5%), p = 0.003; B-cells: MHC class I - day 0 (83% ± 5%) vs day 30 (55% ± 6%), p = 0.003, MHC class II - day 0 (101% ± 1%) vs day 30 (79% ± 6%), p = 0.006; T-cells: MHC class I - day 0 (71% ± 7%) vs day 30 (49% ± 5%), p = 0.04). No free clusters of immunoglobulin G deposition were detected in any experimental group. CONCLUSION: Arterialized venous allografts induce strong donor-specific anti-MHC class I and anti-MHC class II antibody production with subsequent immune-mediated destruction of these allografts with no evidence of immunoglobulin G deposition. Low-dose tacrolimus suppress the donor-specific antibody production.

Department of Visceral Transplantation Thoracic and Vascular Surgery University of Leipzig Leipzig Germany

Translational Centre for Regenerative Medicine University of Leipzig Leipzig Germany

Translational Centre for Regenerative Medicine University of Leipzig Leipzig Germany; Department of Visceral Transplantation Thoracic and Vascular Surgery University of Leipzig Leipzig Germany

Transplant Surgery Department Institute for Clinical und Experimental Medicine Prague Czech Republic

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