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Enhanced gene delivery system using disulfide-linked chitosan immobilized with polyamidoamine

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Abstract

We developed a polyamidoamine (PAMAM) conjugated disulfide-linked chitosan (dsCS-PAM) for nonviral gene delivery. At weight ratio of 128, dsCS and dsCS-PAM showed positive zeta potential of around 9.5 mV and 14.5 mV, respectively, demonstrating their ability to form complexes with plasmid DNA (pDNA) for cell transfection. CS-PAM and dsCS-PAM formed complexes with pDNA in a reducing environment containing 5 mM DLdithiothreitol (DTT) at weight ratio 32 and 16, respectively. PAMAM conjugated chitosan derivatives, dsCS-PAM and CS-PAM, showed higher in vitro transfection efficiency than unconjugated derivatives dsCS and CS. Approximately 80% of A549 and 293 cells were viable in the presence of up to 100 μg/mL of dsCS-PAM. The results of this study demonstrate that dsCS-PAM has the potential to be a safe gene delivery carrier.

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Correspondence to Sung Wan Kim.

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These authors contributed equally to this work.

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Nam, K., Park, J.W., Bark, H. et al. Enhanced gene delivery system using disulfide-linked chitosan immobilized with polyamidoamine. Macromol. Res. 22, 370–376 (2014). https://doi.org/10.1007/s13233-014-2052-7

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  • DOI: https://doi.org/10.1007/s13233-014-2052-7

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