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Published on: June 19, 2013
Transfection of a mouse dendritic cell line by plasmid DNA-loaded PLGA microparticles in vitro
Samantha Jilek1, Heike Zurkaulen, Jovan Pavlovic
1Department of Chemistry and Applied BioSciences, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich, Switzerland.
Abstract:
Targeting of DC for DNA vaccination may be achieved by DNA-loaded poly(lactide-co-glycolide) (PLGA) biodegradable microparticles, since DC efficiently capture these microparticles in vitro and in vivo. DNA was encapsulated in PLGA microparticles by spray-drying. Various additives were tested and process parameters adjusted in order to prevent degradation of the DNA during encapsulation. The highest degree of supercoiled DNA was maintained by adding a strong buffering agent, such as PBS or NaHCO(3), whereas the cryoprotective lactose did not show a significant protective effect. DNA-containing PLGA microparticles were administered to a mouse DC line. Transfection efficacy was compared with commonly employed cationic transfectants and was visually assessed by green fluorescent protein expression. Transfection rate was very low in DC for all microparticle formulations and was comparable with commonly used cationic transfectants. It is concluded that the transfection of DC using PLGA microparticles is feasible, but efforts need to be undertaken to improve transfection efficiency in vitro, which may in addition lead to improved immune responses in vivo.
Insights
DNA-loaded poly(lactide-co-glycolide) (PLGA) microparticles show promise for DNA vaccination by targeting dendritic cells (DC). However, current methods result in low transfection efficiency, requiring further optimization for improved immune responses.
Area of Science:
- Biotechnology
- Immunology
- Materials Science
Background:
- Dendritic cells (DC) are key targets for DNA vaccination.
- Poly(lactide-co-glycolide) (PLGA) microparticles offer a potential delivery system for DNA vaccines.
- Efficient delivery of DNA to DCs is crucial for effective vaccination.
Purpose of the Study:
- To investigate the feasibility of using DNA-loaded PLGA microparticles for targeting and transfecting dendritic cells (DCs).
- To optimize DNA encapsulation within PLGA microparticles to prevent DNA degradation.
- To compare the transfection efficiency of PLGA microparticles with conventional cationic transfectants.
Main Methods:
- DNA was encapsulated into PLGA microparticles using spray-drying.
- Various additives, including buffering agents (PBS, NaHCO3) and lactose, were tested for DNA protection.
- Transfection efficacy was assessed in a mouse DC line by measuring green fluorescent protein expression.
Main Results:
- Buffering agents (PBS, NaHCO3) effectively protected supercoiled DNA during encapsulation, while lactose showed minimal protective effect.
- Transfection rates of DNA-loaded PLGA microparticles in DCs were low across all formulations.
- The transfection efficiency was comparable to commonly used cationic transfectants.
Conclusions:
- Transfection of dendritic cells using PLGA microparticles is feasible.
- Significant improvements in in vitro transfection efficiency are necessary to enhance in vivo immune responses.
- Further research is needed to optimize PLGA microparticle formulations for effective DNA vaccine delivery.
