RESUMEN
Retroviral suicide gene vectors have successfully been used in clinical studies to improve the safety of adoptive immunotherapy with allogeneic T lymphocytes in the treatment of malignant and viral diseases. At the same time these studies have revealed several problems that are yet to be resolved including impaired T cell function due to long ex vivo culture. Here we present new retroviral vectors co-expressing truncated CD34, a gene transfer marker which ensures rapid enrichment of transduced cells using commercially available GMP-approved devices, and a splice-corrected variant of Herpes simplex virus thymidine kinase (scHSVtk) which confers high sensitivity to the prodrug ganciclovir. We show that a retroviral hybrid vector, MP71, based on the myeloproliferative sarcoma virus (MPSV) and the murine embryonic stem cell virus (MESV), encoding a tCD34/scHSVtk fusion protein mediates high expression of the 'sort-suicide' selection marker, thereby allowing for highly efficient purification and selective elimination of transduced cells.
Asunto(s)
Inmunoterapia Adoptiva/métodos , Depleción Linfocítica/métodos , Linfocitos T/trasplante , Antígenos CD34/genética , Ganciclovir/farmacología , Marcadores Genéticos , Vectores Genéticos , Humanos , Células Jurkat , Microscopía Confocal , Retroviridae/genética , Linfocitos T/efectos de los fármacos , Transducción GenéticaRESUMEN
Cytoplasmic vector systems are generally used for expression of lymphocytic choriomeningitis virus (LCMV) proteins. However, we achieved high levels of cell surface glycoproteins using a standard nuclear expression plasmid. Expression was independent of other LCMV proteins but was blocked by a missense mutation within the original LCMV(WE) glycoprotein cDNA.