Abstract: Ionizable lipids with a disulfide moiety and lipid nanoparticles comprising said lipids are disclosed. In select preferred embodiments, the ionizable lipids have a structure of formulae 11-15. The lipid nanoparticles formed from the ionizable lipids can be used as delivery vehicles for medicinal small molecules, antibodies, nucleotides, and polypeptides. Such nanoparticles can be used as vaccines or the treatment of cancer.

Abstract: Chitosan-nucleic acid polyplex compositions containing a reversibly bound polymer coat comprising linear block copolymers with a polyanionic anchor region and at least one polyethylene glycol tail region are described herein. In some cases, the compositions exhibit improved stability and/or mucosal diffusion as compared to uncoated particles. In some cases, the reversibly bound polymer coat does not interfere with, or enhances, transfection of target cells or tissues as compared to uncoated particles.

Abstract: The present disclosure relates to methods and compositions comprising derivatized-chitosan polyplexes reversibly coated with a polyanion-containing block co-polymer for the localized expression of IL-12 in mucosal tissues, preferably in combination with an IFN-1 activator/inducer, for use in cancer immunotherapy.