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Shuttle of lentiviral vectors via transplanted cells in vivo

Abstract

Lentiviral vectors have turned out to be an efficient method for stable gene transfer in vitro and in vivo. Not only do fields of application include cell marking and tracing following transplantation in vivo, but also the stable delivery of biological active proteins for gene therapy. A variety of cells, however, need immediate transplantation after preparation, for example, to prevent cell death, differentiation or de-differentiation. Although these cells are usually washed several times following lentiviral transduction, there may be the risk of viral vector shuttle via transplanted cells resulting in undesired in vivo transduction of recipient cells. We investigated whether infectious lentiviral particles are transmitted via ex vivo lentivirally transduced cells. To this end, we explored potential viral shuttle via ex vivo lentivirally transduced cardiomyocytes in vitro and following transplantation into the brain and peripheral muscle. We demonstrate that, even after extensive washing, infectious viral vector particles can be detected in cell suspensions. Those lentiviral vector particles were able to transduce target cells in transwell experiments. Moreover, transmitted vector particles stably transduced resident cells of the recipient central nervous system and muscle in vivo. Our results of lentiviral vector shuttle via transduced cardiomyocytes are significant for both ex vivo gene therapy and for lentiviral cell tracing, in particular for investigation of stem cell differentiation in transplantation models and co-cultivation systems.

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Acknowledgements

This work was supported by the HILF program of the Hannover Medical School. Ulrike Blömer was supported by ‘Deutsche Stiftung Querschnittslähmung’ and Ina Gruh by the ‘Graduiertenförderung’ of the Hannover Medical School and Niedersachsen Stiftung/CORTISS. pHR'SIN-CEW, pCMVΔR8.91 and pMD.G were kind gifts of D Trono. We are grateful to M Schweizer, ZMNH Hamburg, for providing time on the confocal microscope and to Patricia Schult-Dietrich, who performed the p24 assay.

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Blömer, U., Gruh, I., Witschel, H. et al. Shuttle of lentiviral vectors via transplanted cells in vivo. Gene Ther 12, 67–74 (2005). https://doi.org/10.1038/sj.gt.3302384

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