Demonstration of clonable alloreactive host T cells in a primate model for bone marrow transplantation

Y. Reisner, I. Ben-Bassat, D. Douer, A. Kaploon, E. Schwartz, B. Ramot

Research output: Contribution to journalArticlepeer-review


The phenomenon of marrow rejection following supralethal radiochemotherapy was explained in the past mainly by non-T-cell mechanisms known to be resistant to high-dose irradiation. In the present study a low but significant number of radiochemoresistant-clonable T cells was found in the peripheral blood and spleen of Rhesus monkeys following the cytoreductive protocol used for treatment of leukemia patients prior to bone marrow transplantation. More than 95% of the clonable cells are concentrated in the spleen 5 days after transplant. The cells possess immune memory as demonstrated by the generation of alloreactive-specific cytotoxicity. The present findings suggest that host-versus-graft activity may be mediated by alloreactive T cells. It is hoped that elimination of such cells prior to bone marrow transplantation will increase the engraftment rate of HLA-nonidentical marrow in leukemia patients.

Original languageEnglish
Pages (from-to)4012-4015
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number11
StatePublished - 1986
Externally publishedYes


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