DNA nuclear targeting sequences for non-viral gene delivery
Ethlinn V B van Gaal1, Ronald S Oosting, Roel van Eijk
1Department of Pharmaceutics, Utrecht Institute of Pharmaceutical Sciences, Utrecht University, 3584 CA, Utrecht, The Netherlands.
Pharmaceutical Research
|March 23, 2011
Summary
DNA nuclear targeting sequences (DTS) did not improve non-viral gene delivery efficiency. Introducing DTS into plasmid DNA (pDNA) did not enhance transgene expression or nuclear uptake in tested cell lines.
Area of Science:
- Molecular Biology
- Gene Delivery
Background:
- Non-viral gene delivery relies on efficient plasmid DNA (pDNA) nuclear import.
- DNA nuclear targeting sequences (DTS) are hypothesized to enhance pDNA nuclear import.
Purpose of the Study:
- To investigate if DTS enhance pDNA nuclear import and improve non-viral gene delivery efficiency.
- To evaluate the impact of DTS on transgene expression and nuclear uptake of pDNA.
Main Methods:
- DTS were cloned into EGFP-reporter pDNA constructs.
- pDNA constructs were delivered into A431 and HeLa cells via electroporation, polyfection, or lipofection.
- Nuclear pDNA levels were quantified by qPCR, and transfection efficiency by flow cytometry.
Main Results:
- No DTS significantly increased transgene expression or nuclear uptake.
- Varying parameters like mitotic activity, dose, and delivery strategy did not improve DTS efficacy.
- TNF-α stimulation led to increased transcription, not enhanced nuclear import.
Conclusions:
- DTS do not enhance gene expression or nuclear uptake in non-viral gene delivery.
- The studied DTS offer no apparent benefit for pDNA transfection efficiency.
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