Abstract:
BACKGROUND:We are presently investigating the therapeutic potential of herpes simplex-thymidine kinase-expressing donor T cells in the setting of a T cell-depleted allogeneic bone marrow transplantation. The generation, expansion, and selection of the gene-modified T cells require a 12-day ex vivo culture period in high-dose interleukin (IL)-2 that could significantly alter their in vivo alloreactivity. METHODS:We evaluated the alloreactive potential of such cultured cells in a murine allogeneic bone marrow transplantation model. RESULTS:The present studies demonstrate that ex vivo-expanded cultured T cells are capable of strong alloreactivity as evidenced by the occurrence of lethal acute graft-versus-host disease (GVHD). However, GVHD mortality after administration of the cultured T cells occurred later than after the administration of a same number of fresh T cells. Similar kinetics of GVHD-induced mortality between cultured and fresh T cells required a 10-fold increase in the number of cultured T cells, indicating a reduced alloreactive potential of these cells. The addition of a 2-day "resting" period in low-dose IL-2 resulted in T cells with enhanced alloreactive potential identical to the alloreactivity observed with fresh T cells. CONCLUSION:Ex vivo IL-2-expanded T cells are capable of significant in vivo alloreactivity. However, an increase in the number of cultured T cells administered or the introduction of a short resting culture period prior to infusion is necessary in order to achieve in vivo alloreactivity identical to the alloreactivity observed with fresh T cells.
journal_name
Transplantationjournal_title
Transplantationauthors
Contassot E,Murphy W,Angonin R,Pavy JJ,Bittencourt MC,Robinet E,Reynolds CW,Cahn JY,Hervé P,Tiberghien Pdoi
10.1097/00007890-199805270-00014subject
Has Abstractpub_date
1998-05-27 00:00:00pages
1365-70issue
10eissn
0041-1337issn
1534-6080journal_volume
65pub_type
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