Targeted gene delivery to glioblastoma using a C-end rule RGERPPR peptide-functionalised polyethylenimine complex |
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Authors: | Jing Wang Yang Lei Cao Xie Weiyue Lu Zhiqiang Yan Jie Gao Zuoxu Xie Xiaoyu Zhang Min Liu |
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Institution: | 1. Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education, Department of Pharmaceutics, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, PR China;2. National Engineering Research Center for Nanotechnology, Shanghai 200241, PR China |
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Abstract: | Safe and efficient systems capable of specifically targeting brain tumour cells represent a promising approach for the treatment glioblastoma multiforme. Neuropilin-1 (NRP-1) is over-expressed in U87 glioma cells. In the current study, the tumour specific peptide RGERPPR, which binds specifically to NRP-1, was used as a targeting ligand in a gene delivery strategy for glioblastoma. The RGERPPR peptide was coupled to branched polyethylenimine (PEI, 25 kDa) using heterobifunctional Mal–PEG–NHS, resulting in a novel gene delivery polymer. Polymer/plasmid DNA (pDNA) complexes were formed and their sizes and zeta potentials were measured. Compared with the unmodified mPEG–PEI/pDNA complexes, the RGERPPR–PEG–PEI/pDNA complex led to a significant enhancement in intracellular gene uptake and tumour spheroid penetration. Furthermore, the RGERPPR–PEG–PEI/pDNA complex facilitated enhanced transfection efficiency levels, as well as a reduction in cytotoxicity when tested in U87 glioma cells in vitro. Most significantly of all, when complexes formed with pDsRED-N1 were injected into the tail vein of intracranial U87 tumour-bearing nude mice, the RGERPPR–PEG–PEI complexes led to improved levels of red fluorescence protein expression in the brain tissue. Taken together, the results show that RGERPPR–PEG–PEI could be used as a safe and efficient gene delivery vehicle with potential applications in glioblastoma gene delivery. |
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Keywords: | Glioma targeting C-end rule peptide Neuropilin-1 Gene delivery Polyethylenimine |
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