Yoshiyuki Hattori^*, Shohei Arai, Takuto Kikuchi, Megumi Hamada, Ryou Okamoto, Yoko Machida, Kumi Kawano

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Department of Drug Delivery Research, Hoshi University, Tokyo, Japan.
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Abstract: Previously, we developed a novel siRNA transfer method to the liver by sequential intravenous injection of poly-L-glutamic acid (PGA) and cationic liposome/siRNA complex (cationic lipoplex). In this study, we examined the effects of the charge ratio (+/-) of cationic liposome/siRNA, molecular weight of PGA and cationic lipid of cationic liposome on the biodistribution of siRNA after sequential injection of PGA plus cationic lipoplex. When 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP)/cholesterol (Chol) lipoplex was intravenously injected into mice, the accumulation of siRNA was mainly observed in the lungs. In contrast, when DOTAP/Chol lipoplex was intravenously injected at 1 min after intravenous injection of PGA, siRNA was largely accumulated in the liver. The charge ratio (+/-) of DOTAP/Chol liposome/siRNA did not affect the biodistribution of siRNA after sequential injection. As regards the molecular weight of PGA, the accumulation of siRNA was observed mainly in the liver after the sequential injection of PGA of 20.5, 38, 64 or 200 kDa plus DOTAP/Chol lipoplex. Furthermore, to examine the effect of cationic lipid of cationic liposome on the biodistribution of siRNA, we prepared other cationic liposomes composed of 1,2-di-O-octadecenyl-3-trimethylammonium propane chloride (DOTMA)/Chol, dimethyldioctade-cylammonium bromide (DDAB)/Chol and O,O’-ditetradecanoyl-N-(α-trimethylammonioacetyl)di-ethanolamine chloride (DC-6-14)/Chol. For the cationic liposomes, the accumulation of siRNA was observed mainly in the liver when their cationic lipoplexes were sequentially injected after injection of PGA into mice. From these findings, sequential injection of PGA plus cationic lipoplex could deliver siRNA efficiently into the liver regardless of the charge ratio (+/-) of lipoplex, lengths of PGA and cationic lipid of liposome.

Keywords: Cationic Liposome, siRNA Delivery, Polyglutamic Acid, Liver Targeting, Sequential Injection

Cite this paper: Hattori, Y. , Arai, S. , Kikuchi, T. , Hamada, M. , Okamoto, R. , Machida, Y. and Kawano, K. (2015) Optimization of siRNA Delivery Method into the Liver by Sequential Injection of Polyglutamic Acid and Cationic Lipoplex. Pharmacology & Pharmacy, 6, 302-310. doi: 10.4236/pp.2015.67032.

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