Non-viral nanovectors for gene delivery: factors that govern successful therapeutics

Gene therapy is regarded as one of the most promising therapeutic approaches, as it has the potential to treat disorders by correcting malformations at the nucleic acids.

Some of the most recent developments in the process of plasmid DNA vector design and formulation are reviewed with a special focus on: different formulations of nanovectors and a summary of successful cases reported; requirements for systemic administration; and functionalization of the nanocarriers by use of targeting entities.

An understanding of the different physiological barriers and a comprehensive review of the recent strategies used to overcome these obstacles. Particular attention is given to formulations for intravenous administration, colloidal stability properties and different targeting entities used.

Overall, vector formulation must take into account the administration route and inherent physiological barriers. Critical parameters for the success of pDNA nanovectors are: particles size, colloidal stability of the formulation and interaction between the carrier and plasmid DNA. Highly relevant is the fact that this interaction should be balanced to offer protection to degradation as well as allow dissociation of the therapeutic nucleic acid for obtaining maximal activity.