Design of curdlan-based pH-sensitive polymers with endosome buffering functionality for siRNA delivery.

Developing nucleic acid-based tools to control disease-relevant gene expression in human disorders, such as siRNAs, opens up potential opportunities for therapeutics. Because of their high molecular weight and polyanionic nature, synthetic siRNAs fail to cross biological membranes by passive diffusion and therefore, generally require transmembrane siRNA delivery technologies to access the cytoplasm of target cells. To create a biocompatible siRNA delivery agent, we chemically modified natural polysaccharide curdlan derivative 6AC-100 in a regioselective manner to introduce different ratios of imidazole rings in the amino units (denoted as Curimi) and evaluated their siRNA binding ability, cytotoxicity, endosome buffering capacity and siRNA transfection efficiency. The novel curdlan based Curimi polymers formed nanoparticles with siRNA at pH 7.4 in range of 85-105 nm and their size distribution increased along with decreasing pH condition. The zeta potential increased by lowering pH value as well. Curimi polymers showed lower toxicity and higher buffering capacity compared to 6AC-100, and efficiently delivered siRNA against to PLK1 into cancer cells, and subsequently, significantly inhibited target mRNA level. Our result suggested that novel curdlan based Curimi polymers may be used as efficient siRNA carrier for cancer therapy.