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The Journal of Immunology, 2001, 166: 1398-1404.
Copyright © 2001 by The American Association of Immunologists

Both {gamma}{delta} T Cells and NK Cells Inhibit the Engraftment of Xenogeneic Rat Bone Marrow Cells and the Induction of Xenograft Tolerance in Mice1

Boris Nikolic2, David T. Cooke2, Guiling Zhao and Megan Sykes3

Bone Marrow Transplantation Section, Transplantation Biology Research Center, Surgical Service, Massachusetts General Hospital/Harvard Medical School, Boston, MA 02129

In murine allogeneic bone marrow transplantation recipients, treatment of the hosts with a nonmyeloablative regimen, including depleting anti-CD4 and anti-CD8 mAbs, allows establishment of long-term mixed chimerism and donor-specific tolerance. However, in the xenogeneic rat-to-mouse combination, additional anti-Thy1.2 and anti-NK1.1 mAbs are required. We have now attempted to identify the xenoresistant mouse cell populations that are targeted by anti-NK1.1 and anti-Thy1.2 mAbs. C57BL/6 (B6) wild-type, B6 TCR{beta}-/-, and B6 TCR{delta}-/- mice received anti-CD4 and anti-CD8 mAbs, followed by 3 Gy of whole body irradiation, 7 Gy of thymic irradiation, and transplantation of T cell-depleted rat bone marrow cells. Anti-NK1.1 and anti-Thy1.2 mAbs were additionally administered to some groups. Increased rat chimerism was observed in TCR{delta}-/- mice treated with anti-CD4, anti-CD8, and anti-NK1.1 mAbs compared with similarly treated TCR{beta}-/- mice. In TCR{beta}-/- mice, but not in TCR {delta}-/- mice, donor chimerism was increased by treatment with anti-Thy1.2 mAb, indicating that CD4-CD8-TCR{gamma}{delta}+Thy1.2+NK1.1- cells ({gamma}{delta} T cells) are involved in the rejection of rat marrow. In addition, chimerism was enhanced in both TCR{beta}-/- and TCR{delta}-/- mice treated with anti-CD4, anti-CD8, and anti-Thy1.2 mAbs by the addition of anti-NK1.1 mAb to the conditioning regimen. Donor-specific skin graft prolongation was enhanced by anti-Thy1.2 and anti-NK1.1 mAbs in TCR{delta}-/- mice. Therefore, in addition to CD4 and CD8 T cells, {gamma}{delta} T cells and NK cells play a role in resisting engraftment of rat marrow and the induction of xenograft tolerance in mice.




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