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The AGMA1 polyamidoamine mediates the efficient delivery of siRNA.
Journal of Drug Targeting 2017 November
AGMA1, a prevailingly cationic, guanidine-bearing, linear, amphoteric polyamidoamine is an effective siRNA condensing agent. Here two AGMA1 samples of different molecular weight, i.e. AGMA1-5 and AGMA1-10 were evaluated as siRNA condensing agents and transfection promoters. AGMA1-10 formed stable polyplexes with a size lower than 50 nm and positive zeta potential. AGMA1-5 polyplexes were larger, about 100 nm in size. AGMA1-10 polyplexes, but not AGMA1-5 proved to be an effective intracellular siRNA carrier, able to trigger gene silencing in Hela and PC3 cell lines without eliciting cytotoxic effects. AGMA1-10 knocked down AKT-1 expression upon transfection with an AKT-1 specific siRNA. The polyplex entry mechanism was investigated and was mediated by macropinocytosis. In conclusion, AGMA1 has potential as an efficient, non-toxic tool for the intracellular delivery of siRNA and warrants further investigation.
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