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Gene delivery through cell culture substrate adsorbed DNA complexes
Zain Bengali1, Angela K Pannier, Tatiana Segura
1Department of Interdepartmental Biological Sciences, Northwestern University, 2145 Sheridan Rd./E156, Evanston, Illinois 60208-3120, USA.
Biotechnology and Bioengineering
|April 1, 2005
Summary
Substrate-mediated gene delivery immobilizes DNA complexes, enhancing transfection efficiency and cell viability. Serum modification significantly boosts gene expression, offering a promising tool for biotechnology and tissue engineering.
Area of Science:
- Biotechnology
- Molecular Biology
- Biomaterials Science
Background:
- Efficient gene delivery is crucial for biotechnology applications.
- Substrate-mediated delivery and reverse transfection improve gene transfer by concentrating DNA near cells.
- Immobilizing plasmids to substrates enhances DNA availability in the cellular microenvironment.
Purpose of the Study:
- To investigate gene delivery using immobilized DNA complexes (polyplexes and lipoplexes) on various substrates.
- To evaluate the impact of substrate properties and serum modification on gene delivery efficiency.
- To assess the viability of primary cells transfected with immobilized complexes and explore applications in tissue engineering.
Main Methods:
- Complexing plasmids with cationic polymers (polyplexes) or lipids (lipoplexes).
- Adsorbing these complexes onto tissue culture polystyrene and serum-adsorbed substrates.
- Quantifying DNA immobilization over time and assessing deposition rates.
- Measuring reporter gene expression and cell viability after transfection.
- Extending the method to poly(lactide-co-glycolide) biomaterials.
Main Results:
- DNA immobilization increased with exposure time, influenced by substrate and complex properties.
- Serum modification enhanced polyplex reporter gene expression up to 1500-fold, outperforming bolus delivery.
- Serum modification increased the number of transfected cells for lipoplexes, with similar expression levels.
- Immobilized complexes improved primary cell viability compared to bolus delivery.
- The method was successfully adapted to poly(lactide-co-glycolide) biomaterials.
Conclusions:
- Substrate-mediated delivery of immobilized DNA complexes is an effective method for enhancing gene delivery.
- Serum modification significantly improves gene delivery efficiency, particularly for polyplexes.
- This approach offers improved cell viability and has potential applications in tissue engineering and in vitro studies.