Dioctadecyldimethylammonium:monoolein nanocarriers for efficient in vitro gene silencing

Area of Science:

• Biotechnology
• Nanomedicine
• Molecular Biology

Background:

• siRNA delivery systems are crucial for gene silencing therapies.
• Liposomal formulations offer potential for stable and targeted delivery.
• Novel lipid combinations are needed to enhance efficacy and reduce toxicity.

Purpose of the Study:

• To develop and evaluate novel liposomal formulations for siRNA delivery.
• To compare the efficacy of dioctadecyldimethylammonium bromide (DODAB) and dioctadecyldimethylammonium chloride (DODAC) in MO-based liposomes.
• To assess the potential of these formulations for gene silencing in cancer cells.

Main Methods:

• Formulation of liposomes using monoolein (MO) with DODAB or DODAC.
• Characterization of liposome size, surface charge, and siRNA encapsulation efficiency.
• Evaluation of cellular uptake and gene silencing efficacy in H1299 lung cancer cells.
• Assessment of cytotoxicity compared to standard helper lipids like DOPE.

Main Results:

• Stable, positively charged lipoplexes (100-160 nm) efficiently encapsulated siRNA.
• DODAB:MO liposomes exhibited higher cellular internalization and gene silencing efficiency than DODAC:MO.
• MO-based liposomes showed comparable gene silencing to DOPE but with significantly lower cytotoxicity.
• DODAB:MO liposomes demonstrated enhanced fusogenic potential due to uniform MO incorporation.

Conclusions:

• DODAB:MO liposomes represent a promising formulation for systemic siRNA delivery.
• The combination of MO with DODAB enhances siRNA delivery efficacy and reduces toxicity.
• These findings support the development of novel liposomal nanocarriers for advanced gene therapy applications.