The influence of RGD addition on the gene transfer characteristics of disulfide-containing polyethyleneimine/DNA complexes

Biomaterials
Yun-Xia SunRen-Xi Zhuo

Abstract

Arginine-glycine-aspartic acid (RGD) ligand is often chemically attached to polycation vector to improve the transfection efficiency. However, the chemical reaction may reduce or even inactivate the biological activities of peptides. In order to retain the targeting ability and biological activities, the RGD peptide was noncovalently introduced into polycations as gene delivery systems. In this paper, the tripeptide sequence RGD was added to disulfide-containing polyethyleneimine (SS-PEI)/DNA binary complexes to evaluate the influence of RGD addition for the particle size, zeta potential, morphology, and transfection efficiency. GelRed was used as a molecular probe to show the effect of RGD addition on the cellular uptake of complexes. In vitro transfection experiments showed that SS-PEI exhibited comparable transfection efficiency, but lower cytotoxicity in comparison with 25kDa PEI. The transfection efficiency of complexes with RGD in HeLa cells was reduced statistically significantly with the increasing content of RGD peptide, but that in 293T cells was not altered significantly with the increasing content of RGD peptide. The reduced transfection efficiency of SS-PEI/DNA complexes with RGD in HeLa cells was attributed to the...Continue Reading

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