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Vectofusin-1 Promotes RD114-TR-Pseudotyped Lentiviral Vector Transduction of Human HSPCs and T Lymphocytes.
Molecular Therapy. Methods & Clinical Development 2017 June 17
Ex vivo transduction of human CD34(+) hematopoietic stem/progenitor cells (hCD34(+) HSPCs) and T lymphocytes is a key process that requires high efficiency and low toxicity to achieve effective clinical results. So far, several enhancers have been used to improve this process. Among them, Retronectin highly meliorates VSV-G and RD114-TR pseudotyped lentiviral vector delivery in hCD34(+) HSPCs and T lymphocytes. However, Retronectin is expensive and requires pre-coating of culture dishes or bags before cell seeding, resulting in a cumbersome procedure. Recently, an alternative transduction adjuvant has been developed, named Vectofusin-1, whose effect has been demonstrated on gene delivery to cell lines and primary hCD34(+) HSPCs by lentiviral vectors pseudotyped with different envelope glycoproteins. In this study, we have focused our analysis on the effect of Vectofusin-1 on the transduction of hCD34(+) HSPCs and T lymphocytes by using mostly RD114-TR pseudotyped lentivectors and clinical transduction protocols. Here, we have proved that Vectofusin-1 reproducibly enhances gene delivery to hCD34(+) HSPCs and activated T cells without cell toxicity and with efficacy comparable to that of Retronectin. The use of Vectofusin-1 will therefore help to shorten and simplify clinical cell manipulation, especially if automated systems are planned for transducing large-scale clinical lots.
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