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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Biomaterials. 2015 Dec 2;79:56–68. doi: 10.1016/j.biomaterials.2015.11.056

Figure 8.

Figure 8

A scheme systemic delivery of liposomal siRNA formula that can partly solve current delivery problems: (1) inhibition of surface ligand induced immune response/poor tumor penetration by covering surface ligands with PEGs; (2) increase of PEGylation caused less cellular uptake by applying cleavable PEGs; (3) investigation of cellular uptake/endosomal escape mechanism by applying advanced cellular trafficking techniques.