Small cyclen-imidazolium-containing molecules and their interactions with DNA

Area of Science:

• Supramolecular Chemistry
• Biomaterials Science
• Gene Therapy

Background:

• Gene delivery vectors are crucial for therapeutic applications.
• Developing non-viral vectors with low cytotoxicity is a key challenge.
• Cyclen and imidazolium-based molecules offer potential as DNA-binding agents.

Purpose of the Study:

• To synthesize and characterize novel organic molecules with varying cyclen and imidazolium units.
• To evaluate their DNA condensation capabilities and potential as gene delivery vectors.
• To assess their cytotoxicity and DNA release properties.

Main Methods:

• Synthesis of three small organic molecules.
• Agarose gel electrophoresis and ethidium bromide exclusion assays for DNA condensation.
• Dynamic light scattering (DLS) and transmission electron microscopy (TEM) for particle analysis.
• Cellular uptake studies using BEL-7402 cells and lipid DOPE.
• Cytotoxicity assays comparing with Polyethylenimine (PEI) 25 kDa.

Main Results:

• Synthesized molecules effectively condensed plasmid DNA.
• Higher molecular weight compounds achieved full DNA condensation at lower weight/weight ratios.
• DNA-protein complexes formed nanosized spherical particles.
• One compound (10) demonstrated partial DNA release at 200 mM NaCl.
• Compound 10 facilitated plasmid DNA transfer into BEL-7402 cells in the presence of DOPE.
• Exhibited significantly lower cytotoxicity than PEI 25 kDa.

Conclusions:

• Novel cyclen-imidazolium organic molecules are effective DNA condensing agents.
• Molecular weight influences DNA condensation efficiency.
• These compounds show potential as non-viral gene delivery vectors with reduced toxicity.