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Successful gene therapy for cancer treatment and various human genetic diseases relies on high efficient gene carriers, and many carriers can efficiently deliver plasmid DNA to cells, while most of them are unefficient in siRNA delivery. In this study, a series of amphiphilic copolymers are synthesized for pDNA and siRNA delivery by grafting hydrophobic polyalanine to polyethylenimine (named PPAs)...
Despite its cytotoxicity, polyethylenimine (PEI) is still used as a golden reference in gene transfection. Long PEI chains are more effective but also more cytotoxic. To solve this problem, an alternative strategy is to link short PEI chains into a longer PEI with disulfide bonds because they are degradable in the cell. However, how PEI promotes gene transfection is still unclear. Also, the chain...
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