Cationic polyhexylcyanoacrylate nanoparticles as carriers for antisense oligonucleotides

Area of Science:

• Biotechnology
• Nanomedicine
• Oligonucleotide Therapeutics

Background:

• Antisense oligodeoxynucleotides (ODNs) show therapeutic potential but require improved delivery methods.
• Modified oligonucleotides have been developed to enhance nuclease resistance and cellular uptake.

Purpose of the Study:

• To evaluate diethylaminoethyl (DEAE)-dextran and polyhexylcyanoacrylate (PHCA) nanoparticles as carriers for ODNs.
• To assess the loading capacity, adsorption efficiency, and protective capabilities of these nanoparticles for ODNs.

Main Methods:

• Preparation of positively charged nanoparticles from DEAE-dextran and PHCA.
• Analysis of ODN loading capacity and adsorption using anion-exchange HPLC.
• Evaluation of ODN protection against DNase I degradation and assessment of cellular uptake in vitro.

Main Results:

• Nanoparticles demonstrated high ODN loading capacity (approx. 35 mumol ODNs/g).
• Adsorption efficacy was pH, ionic strength, and DEAE-dextran dependent, with optimal loading at pH 5.5.
• Adsorbed ODNs were protected from DNase I degradation, and nanoparticle formulations increased cellular uptake 20-fold.
• Temperature-dependent uptake suggests an active mechanism like endocytosis.

Conclusions:

• DEAE-dextran and PHCA nanoparticles are effective carriers for ODNs, enhancing their stability and cellular delivery.
• The nanoparticle formulation protects ODNs from enzymatic degradation and facilitates cellular internalization.
• The findings support the potential of these ODN-nanoparticle formulations for therapeutic applications.