Trehalose enhances transgene expression mediated by DNA-PEI complexes

Area of Science:

• Biotechnology
• Molecular Biology
• Gene Delivery

Background:

• Polyethylenimine (PEI) is a common non-viral vector for gene delivery.
• Improving PEI transfection efficiency often requires chemical modifications, adding complexity.
• Enhancers could simplify the process and improve gene expression.

Purpose of the Study:

• To investigate trehalose as an enhancer for DNA-PEI mediated gene transfection.
• To explore the mechanism by which trehalose affects transfection efficiency and transgene expression.
• To determine the optimal conditions for trehalose application in gene delivery.

Main Methods:

• Transfection of cells with DNA-PEI complexes in the presence or absence of trehalose.
• Quantification of green fluorescent protein (GFP) expression as a measure of transfection efficiency.
• Assessment of intracellular plasmid levels and cell uptake dynamics.
• Evaluation of trehalose treatment timing and duration effects.

Main Results:

• Trehalose significantly improved transgene expression mediated by DNA-PEI complexes.
• Other disaccharides did not show similar enhancement effects.
• Trehalose presence during transfection, but not before or after, was crucial for enhancement.
• Trehalose inhibited DNA-PEI complex internalization but enhanced transgene expression.
• Enhancement was dependent on the duration of trehalose exposure during transfection.

Conclusions:

• Trehalose acts as an effective enhancer for DNA-PEI mediated gene expression.
• The mechanism likely involves modulation of intracellular trafficking during co-incubation.
• Trehalose offers a promising, non-chemical strategy to improve gene delivery efficiency.