Cationic poly(cyclodextrin)/alginate nanocapsules: From design to application as efficient delivery vehicle of 4-hydroxy tamoxifen to podocyte in vitro.

Most of the drug molecules are partially insoluble in aqueous solution and then may accumulate in fat tissues hampering efficient therapy. Innovative drug delivery strategies have emerged in industry or academia over the last decades, however preserving the activity of the encapsulated drug, having high drug loading capacity and controlling drug release kinetics, are still challenging. In this context, we explored the preparation of new nanocarriers, namely nanocapsules, via a templating method, and using polysaccharides exhibiting biological functions. Cationic poly(cyclodextrin) (P(CD+)) and alginate (alg-) were initially self-assembled layer-by-layer on colloidal gold nanoparticles. Removal of gold nanoparticles was then induced thorough cyanide-assisted hydrolysis, enabling the recovery of nanocapsules. A hydrophobic drug known to allow the mutation of genes inside cells, namely 4-hydroxy-tamoxifen, was loaded within the nanocapsules' shell via inclusion with the cyclodextrin cavities. The so-designed nanomaterials were incubated with immortalized podocytes to investigate i) their incorporation inside cells and ii) their efficiency for in vitro 4-hydroxy-tamoxifen-induced CreERT2 recombination. This work undoubtedly highlights a proof-of-concept for drug delivery using polysaccharides-based capsules with host properties.