© The Royal Society of Chemistry 2016. For effective gene delivery to breast cancer MCF-7 cells, a folate-targeting redox gene carrier was synthesized by Michael addition polymerization between 1-(2-aminoethyl)piperazine and N,N′-cystaminebisacrylamide. Folate was then conjugated through an amidation reaction. The obtained folate-modified hyperbranched poly(amido amine)s (FA-PAAs) degraded in the presence of glutathione and displayed excellent transfection efficiency in vitro. In particular, FA-PAAs showed much higher gene delivery efficiency than PEI-25k in the presence of serum, leading to an obvious decrease in MMP-9 protein expression and the apoptosis of MCF-7 cells. Moreover, FA-PAAs displayed lower cytotoxicity and better blood compatibility than PEI-25k, suggesting a potential application in gene therapy for tumors.
Li, M., Zhou, X., Zeng, X., Wang, C., Xu, J., Ma, D., & Xue, W. (2016). Folate-targeting redox hyperbranched poly(amido amine)s delivering MMP-9 siRNA for cancer therapy. Journal of Materials Chemistry B, 4(3), 547-556. https://doi.org/10.1039/c5tb01964h