Abstract
Recombinant retroviruses are one of the most commonly used gene transfer vehicles for therapeutic gene delivery. The stability of viral vectors upon long-term storage, anticipated to be short lived, is expected to impact timeline and financial course of clinical immunogene therapy. However, to date little is known about vector stability. Therefore, we analyzed the stability of retroviral vectors produced in culture supernatants (RTVsup) for ex vivo gene therapy upon long-term storage. We have generated RTVsups derived from two packaging cell lines, PG13 and Phoenix(Ampho). Both lines produced murine leukemia virus-derived SFG-scFv(G250)-CD4γ vector, which were pseudotyped with the gibbon ape leukemia virus envelope and amphotropic envelope, respectively. The supernatants were stored at −80 or −196 °C. To date, the PG13-derived RTVsups have been evaluated over a period of 9 years (1998–2007). In addition, a clinical batch of Phoenix(Ampho)-derived RTVsup has been evaluated over a period of 5 years (2002–2007). Here, we show that both RTVsups, when stored up to 9 and 5 years, respectively, do not show any sign of decay in their capacity to functionally transduce primary human T cells. These data provide evidence that in terms of ‘life expectancy’ the production and storage of clinical batches of RTVsup for gene therapy warrants the corresponding professional and financial risks.
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Acknowledgements
We thank C Groot-van Ruyven and B van Krimpen for technical assistance. This work was supported by the Dutch Cancer Foundation (grant DDHK99-1865), the European Commission grant QLK3-1999-01262 and the Cancer Research Institute, New York, NY (clinical investigation grant ‘Immuno-gene therapy of metastatic renal cell cancer patients’).
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Lamers, C., van Elzakker, P., Luider, B. et al. Retroviral vectors for clinical immunogene therapy are stable for up to 9 years. Cancer Gene Ther 15, 268–274 (2008). https://doi.org/10.1038/sj.cgt.7701114
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DOI: https://doi.org/10.1038/sj.cgt.7701114