@article{oai:kumadai.repo.nii.ac.jp:00026691,
 author = {本山, 敬一 and 林田, 佳代子 and 東, 大志 and 有馬, 英俊 and Motoyama, Keiichi and Hayashida, Kayoko and Higashi, Taishi and Arima, Hidetoshi},
 issue = {4},
 journal = {Bioorganic and Medicinal Chemistry},
 month = {Feb},
 note = {application/pdf, 論文(Article), Nonviral gene delivery suffers from a number of limitations including short transgene expression times and low transfection efficiency. In this study, we examined whether polypseudorotaxanes (PPRXs) of polyethylene glycol (PEG, molecular weight: 2,000)-grafted α-cyclodextrin (α-CyD)/ polyamidoamine dendrimer conjugate (PEG-α-CDE) with CyDs have the potential for the novel sustained release systems for plasmid DNA (pDNA). The PEG-α-CDE/pDNA complex formed PPRXs with α-CyD and γ-CyD solutions, but not with β-CyD solution. In the PEG-α-CDE/CyDs PPRX systems, 20.6 mol of α-CyD and 11.8 mol of γ-CyD were involved in the PPRXs formation with one PEG chain by α-CyD and γ-CyD, respectively, consistent with in the PEG-dendrimer/CyDs systems. PEG-α-CDE/pDNA/α-CyD PPRX and PEG-α-CDE/pDNA/γ-CyD PPRX formed hexagonal and tetragonal columnar channels in the crystalline phase, respectively. In addition, the CyDs PPRX provided the sustained release of pDNA from PEG-α-CDE complex with pDNA at least 72 h in vitro. The release of pDNA from CyDs PPRX retarded as the volume of dissolution medium decreased. Furthermore, the PEG-α-CDE/γ-CyD PPRX system showed sustained transfection efficiency after intramuscular injection to mice at least for 14 days. These results suggest that the PEG-α-CDE/CyD PPRX systems are useful for novel sustained DNA release systems., http://www.sciencedirect.com/science/article/pii/S0968089612000028},
 pages = {1425--1433},
 title = {Polypseudorotaxanes of Pegylated α-Cyclodextrin/Polyamidoamine Dendrimer Conjugate with Cyclodextrins as a Sustained Release System for DNA},
 volume = {20},
 year = {2012}
}