Graft versus host disease in a rat small bowel transplant model after T-cell depleted donor specific bone marrow infusion

Acta Cirurgica Brasileira

Alexandre Bakonyi Neto²  Evangelos P. Misiakos²  Andreas G. Tzakis²  Mariana Behro¹  Phillip Ruiz¹  Joshua Miller¹  Camilo Ricordi¹  Bonifacio K. Takegawa¹ 

[1] ,UNESP Department of Surgery Division of Liver and GI Transplantation

关键词: Intestinal transplant;    T-cell depletion;    Bone marrow;    Transplante intestinal;    Depleção de células T;    Medula óssea;   

DOI  :  10.1590/S0102-86502003000200003

来源: SciELO

【 摘 要 】

Low cytoreductive regimen of irradiation associated to unmodified bone marrow infusion (UBM) does not prevent the occurrence of graft versus host disease (GVHD) after transplant. PURPOSE: In this study we evaluated the potential advantages of a long-term immunossupression and T-cell depleted bone marrow infusion (TCDBMI) in preventing the occurrence of GVHD after small bowel transplantation (SBTx). METHODS: Heterotopic SBTX was performed with Lewis rats as recipients and DA as donors and distributed into 5 groups according to the irradiation, duration of immunossupression and the use of UBM or TCDBMI: G1 (n=6), without irradiation and G2 (n=9), G3 (n=4), G4 (n=5) and G5 (n=6) was given 250 rd of irradiation. Groups 1,2,4 and G3 and 5 were infused with 100 x 10(6) UBM and TCDBM respectively. Animals in G1, 2, 3 were immunossupressed with 1mg/ FK506/Kg/IM for 5 days and G4 and G5 for 15 days. Anti CD3 monoclonal antibodies and immunomagnetic beads were used for T-cell depletion.Animals were examined for rejection, GVHD, chimerism characterization and ileal and skin biopsies. RESULTS: Minimal to mild rejection was observed in all groups; however, GVHD were present only in irradiated groups. Long-term immunossupression changed the severity of GVHD in G4 and G5. Rejection was the cause of death in G1 while GVHD in G2, 3, 4 and 5, not avoided by the use of TCDBMI. Total chimerism and T-cell chimerism was statistically higher in irradiated groups when compared to G1. CONCLUSION: Extended immunossupression associated to low dose of irradiation decrease the severity of GVHD, not avoided by the use of TCDBMI.

【 授权许可】

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