Production of high-titer helper-free retroviruses by transient transfection - PubMed

Production of high-titer helper-free retroviruses by transient transfection

W S Pear et al. Proc Natl Acad Sci U S A. 1993.

Abstract

The generation of high-titer, helper-free retroviruses by transient transfection has been achieved by using the highly transfectable 293T cell line into which are stably introduced constructs that express retroviral packaging functions. The resulting ecotropic virus packaging cell line BOSC 23 produces infectious retrovirus at > 10(6) infectious units/ml of supernatant within 72 hr after CaPO4-mediated transfection. A stringent assay for replication-competent virus showed that no helper virus was present. The system can produce high titers of retroviral vectors expressing genes that are extremely difficult to propagate at high titer in stable producer lines. This method should facilitate and extend the use of helper-free retroviral gene transfer, as well as be useful for gene therapy.

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