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Prepublished online as a Blood First Edition Paper on June 21, 2002; DOI 10.1182/blood-2002-01-0118.

Submitted January 15, 2002
Accepted June 10, 2002
Transduction of donor hematopoietic stem-progenitor cells with Fas ligand enhanced short-term engraftment in a murine model of allogeneic bone marrow transplant
Katharine A Whartenby*, Erin E Straley, HeeJe Kim, Frederick Racke, Vivek Tanavde, Kevin S Gorski, Linzhao Cheng, Drew M Pardoll, and Curt I Civin
Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
* Corresponding author; email: whartka{at}jhmi.edu.
Fas-mediated apoptosis is a major physiologic mechanism by which activated T cells are eliminated after antigen (Ag)-stimulated clonal expansion generates a specific cellular immune response. Since activated T cells are the major effectors of allograft rejection, we hypothesized that genetically modifying allogeneic bone marrow (BM) cells prior to transplant could provide some protection from host T cell attack, thus enhancing donor cell engraftment in bone marrow transplantation (BMT). We undertook studies to determine the outcome of lentiviral vector-mediated transduction of Fas ligand (FasL) into lineage Ag-negative (lin-) mouse BM cells (lin- BMs), in an allogeneic BMT model. FasL modified lin- BMs killed Fas-expressing T cells in vitro. Mice transplanted with allogeneic FasL+ lin- BMs had enhanced short-term engraftment, after non-myeloablative conditioning, as compared to controls. We observed no major hepatic toxicity, or hematopoietic or immune impairment, of recipient mice at these time points. These results suggest potential therapeutic approaches by manipulating lympho-hematopoietic stem-progenitor cells to express FasL or other immune modulating genes in the context of BMT.

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