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Tolerance in DLA-haploidentical canine littermates following CD6-depleted marrow transplantation and donor lymphocyte transfusion.

Abstract：

OBJECTIVE:Donor lymphocyte transfusions (DLT) are effective in the treatment of leukemia after allogeneic stem cell transplantation. Graft-vs-host-disease (GVHD) is the major risk factor of DLT. In dog leukocyte antigen (DLA)-identical littermate dogs, DLT given within 3 weeks after transplantation of marrow depleted of T cells using absorbed antithymocyte globulin produced fatal GVHD, whereas at 2 months or later after transplantation, DLT were tolerated without GVHD. Here, we studied tolerance to DLT in DLA-haploidentical recipients of CD6-depleted bone marrow. MATERIALS AND METHODS:Bone marrow recipients were DLA-heterozygous and DLA-haploidentical to their DLA-homozygous donors. Marrow transplantation was performed on day 0, one day after total body irradiation with 10Gy. CD6 depletion was achieved by treatment of the marrow with CD6 antibody and rabbit complement. Natural killer cell activity of CD6-depleted cells was studied against canine thyroid adenocarcinoma cells. DLT were given at various time points after transplantation. RESULTS:Seven DLA-heterozygous dogs given undepleted marrow died of GVHD within 28 days. In contrast, three dogs given CD6-depleted marrow had sustained engraftment without occurrence of GVHD. DLT given on either day 3, 7, or 14 produced fatal GVHD. DLT on day 20, however, produced fatal GVHD in only two of four dogs. Mixed chimerism was converted into complete chimerism in all cases. Contrary to T-cell depletion with antithymocyte globulin, CD6 depletion spares canine natural killer cells. CONCLUSIONS:We conclude that T-cell depletion with CD6 antibody and complement induces graft-vs-host tolerance without jeopardizing engraftment. DLT on days 3, 7, and 14 after transplantation produced GVHD, but it failed to abrogate tolerance in two of four dogs transfused on day 20.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Zorn J,Herber M,Schwamberger S,Panzer W,Adler H,Kolb HJ

doi

10.1016/j.exphem.2009.05.001

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

998-1006

issue

8

eissn

0301-472X

issn

1873-2399

pii

S0301-472X(09)00157-X

journal_volume

37

pub_type

杂志文章

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