Transferrin receptor in T cell activation and transplantation.


:Transferrin receptor (TfR) expression is up-regulated during T cell activation after the interaction of the T cell receptor with the antigen-major histocompatibility complex and the expression of interleukin-2 (IL-2) receptor. We hypothesize that anti-TfR monoclonal antibody (mAb) will prolong allograft survival by altering T cell responses. In a murine heterotopic nonvascularized cardiac allograft model, CBA/J (H-2k) recipients were transplanted with neonatal C57BL/6 (H-2b) donor hearts. Anti-TfR or isotype-matched control mAbs (100 microg) were administered at the time of transplantation and on the following day. Splenocytes from naive CBA/J mice were stimulated in vitro with C57BL/6 alloantigen. Anti-TfR mAb was administered at 5 microg/mL during the initiation of culture. Cytotoxic T lymphocyte (CTL) and mixed lymphocyte responses (MLR) were performed to assess T cell function. After 24 h in culture, cells were harvested, RNA isolated, and semi-quantitative reverse transcriptase-polymerase chain reaction performed. Anti-TfR mAb prolonged allograft survival to 25.7 +/- 0.9 days compared to the isotype control (10.7 +/- 0.4 days, P < 0.01, Wilcoxon rank sum). Anti-TfR mAb completely abrogated the CTL response and suppressed the MLR by 70-86% compared to the isotype controls. Anti-TfR mAb suppressed IL-2, interferon-gamma (IFN-gamma), IL-10, and IL-12 p40 mRNA expression, but had no effect on IL-4, IL-12 p35, and IL-15 mRNA expression. In conclusion, anti-TfR mAb prolongs allograft survival, suppresses T cell function, and alters IL-2, IL-10, IL-12 p40, and IFN-gamma mRNA expression. These data suggest that the down-regulation in IL-12 mRNA by anti-TfR mAb may prevent the development of T helper cells, thereby promoting graft survival and altering cell-mediated immune responses. The partial effect by anti-TfR mAb on cytokine mRNA expression may be due to other contributing factors such as costimulation.


J Leukoc Biol


Bayer AL,Baliga P,Woodward JE




Has Abstract


1998-07-01 00:00:00












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