title: Hyperbranched poly(amino ester)s with different terminal amine groups for DNA delivery.
abstract: Hyperbranched poly(amino ester)s containing tertiary amines in the core and primary, secondary, and tertiary amines in the periphery, respectively, were evaluated for DNA delivery in vitro. The same core structure facilitated the investigation on the effects of the terminal amine type on the properties of hyperbranched poly(amino ester)s for DNA delivery. The hydrolysis of the poly(amino ester)s was monitored using (1)H NMR. The results reflected that the terminal amine type had negligible effects on the hydrolysis rate but was much slower than that of linear poly(amino ester)s, probably due to the compact hyperbranched spatial structure preventing the accessibility of water. In comparison with PEI 25 K, the hyperbranched poly(amino ester)s showed much lower cytotoxicity in Cos7, HEK293, and HepG2 cells. Gel electrophoresis indicated that poly(amino ester)s could condense DNA efficiently, and the zeta potentials and sizes of the complexes formed with different weight ratios of hyperbranched poly(amino ester)s and DNA were measured. Remarkably, all the hyperbranched poly(amino ester)s showed DNA transfection efficiency comparable to PEI 25 K in Cos7, HEK293, and HepG2 cells regardless of the terminal amine type. Therefore, the terminal amine type had insignificant effects on the hydrolysis rate, cytotoxicity, DNA condensation capability, and in vitro DNA transfection efficiency of the hyperbranched poly(amino ester)s.
authors.affiliation: Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602.
authors.forename: Decheng
authors.initials: D
authors.lastname: Wu
authors.forename: Ye
authors.initials: Y
authors.lastname: Liu
authors.forename: Xuan
authors.initials: X
authors.lastname: Jiang
authors.forename: Chaobin
authors.initials: C
authors.lastname: He
authors.forename: Suat Hong
authors.initials: SH
authors.lastname: Goh
authors.forename: Kam W
authors.initials: KW
authors.lastname: Leong
mesh_terms: D000818:Animals; D019556:COS Cells; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D002522:Chlorocebus aethiops; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D006868:Hydrolysis; D066298:In Vitro Techniques; D015394:Molecular Structure; D011073:Polyamines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D013499:Surface Properties; D013997:Time Factors; D014162:Transfection
chemical_list: D011073:Polyamines; D011091:Polyesters; D004247:DNA