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AdCTLA-4Ig combined with donor splenocytes, bone marrow cells and anti-ICOS antibody treatment induce tolerance in a rat heart transplantation model

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Transplant International

Abstract

It is difficult to induce rat cardiac allograft tolerance by co-stimulator blockade of the B7-CD28 pathway with CTLA-4Ig monotherapy alone. However, combined therapies of AdCTLA-4Ig plus donor-specific spleen-cell infusion, bone marrow cell infusion, and anti–ICOS antibody have been demonstrated to effectively induce indefinite acceptance of rat cardiac allografts. In this report, we compared the tolerance of cardiac allograft tolerant recipients induced by the above three strategies. The results show that treating Lewis recipients of a DA cardiac allograft with a combination of AdCTLA4-Ig and anti-ICOS antibody, donor splenocytes or bone marrow cells produced indefinite graft survival. Second transplantation of donor type skin or heart grafts could not affect the survival of primary heart graft in anti-ICOS treated groups, but results in rejection of primary heart grafts in other two groups, and that co-stimulator blockade, CD28 and ICOS simultaneously with CTLA-4Ig and anti-ICOS antibody, facilitates the development of CD25+ CD4+ regulatory T cells and induces stable transplantation tolerance in the rat cardiac allograft model. This also provides an effective therapy in clinical transplantation for promoting permanent graft survival by generating regulatory T cells.

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Fig. 1A–I.
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Abbreviations

BMC :

bone marrow cells

ICOS :

inducible co-stimulator

pfu :

plaque-forming units

SPC :

spleen cell

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Acknowledgements

The authors thank Mr. T. Sakai for his technique support. This study was supported by research grants from the Ministry of Health, Labour and Welfare of Japan (12-KO-2, Millennium Project H12-Saisei-016), and a Grant-in-Aid (No. 10307030) and a Grant for Organized Research Combination System from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Correspondence to Xiao-Kang Li.

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Guo, L., Fujino, M., Kimura, H. et al. AdCTLA-4Ig combined with donor splenocytes, bone marrow cells and anti-ICOS antibody treatment induce tolerance in a rat heart transplantation model. Transpl Int 17, 15–21 (2004). https://doi.org/10.1007/s00147-003-0635-x

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  • DOI: https://doi.org/10.1007/s00147-003-0635-x

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