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  • A preparation of donor T-lymphocytes that are transfected with a retroviral vector encoding a chimeric suicide gene consisting of the extracellular and transmembrane domains of human CD34 and mutant 75 of the herpes simplex virus thymidine kinase (HSV-TK75) with potential controllable immunomodulating activity. Donor T cell therapy following allogeneic hematopoietic stem cell (HSC) transplantation may result in a graft-versus-leukemia (GVL) and help control transplant-related viral infections. In the event that graft-versus-host disease (GVHD) develops due to donor lymphocyte infusion, CD34/TK75-transduced donor lymphocytes may be selectively eliminated by administration of the prodrug antiviral agent ganciclovir GCV. In CD34/T75-transduced donor lymphocytes, GCV is phosphorylated by expressed HSV-TK75 to its monophosphate form and, subsequently, converted into its active triphosphate form, which specifically kills the donor lymphocytes. The expressed CD34 moiety of the chimeric suicide gene serves as a selection marker; mutant 75 of HSV-TK confers increased GCV sensitivity.
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