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Cationic lipid-mediated transfection of cells in culture requires mitotic activity

Abstract

Cationic lipid-based delivery systems such as lipoplexes or stabilized plasmid–lipid particles (SPLP) represent a safer alternative to viral systems for gene therapy applications. We studied the impact of cell cycle status on the efficiency of transfection of human ovarian carcinoma tumor cells using two cationic-lipid based delivery systems. Cells arrested in the G1 phase of the cell cycle by treatment with aphidicolin were compared with an asynchronous dividing population of cells. Treatment of the cells with aphidicolin had no effect on the rate of internalization of the lipid formulated DNA or on the level of gene expression observable in stably transfected cells. However, cells treated with aphidicolin exhibited 20-fold lower reporter gene activity than asynchronous control cells upon incubation with lipoplexes. When cells arrested in the G1 phase were allowed to proceed though the cell cycle in the presence of the lipoplex or SPLP, transgene expression was found to coincide with the transition of cells from the G2/M phase into the G1 phase of the subsequent cell cycle. In addition, higher levels of reporter gene expression were observed when the cells were incubated with lipoplexes or SPLP during, or just before, mitosis. These results suggest that it may be possible to augment cationic lipid-mediated transfection by manipulating the cell cycle status of the target cells.

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Mortimer, I., Tam, P., MacLachlan, I. et al. Cationic lipid-mediated transfection of cells in culture requires mitotic activity. Gene Ther 6, 403–411 (1999). https://doi.org/10.1038/sj.gt.3300837

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