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@#Nowadays, there is still no mature gene delivery system for safe and effective transfection on primary dendritic cells (DC). Herein, we constructed a liposome-based gene delivery system for primary DCs and optimized the preparation method to improve the transfection efficiency of siRNA on primary DCs. In this study, different methods, including co-incubation method, ethanol injection method, and protamine compound method, were used to prepare liposome/siRNA complexes based on different cationic lipids. Moreover, particle size, zeta potential, siRNA loading capacity, safety, stability, uptake efficiency and gene silencing efficiency of various liposome/siRNA complexes were detected to screen the optimal cationic lipid as well as its preparation method. We demonstrated that the OA2/siRNA delivery system prepared by the co-incubation method exhibited the best safety, uptake efficiency and gene silencing effect, compared to other siRNA delivery systems including the commercial Lipo2000. In summary, we provide a safe and effective gene delivery vector for primary DC cells through simple preparation method, which could also offer a gene delivery platform for other immune cells.
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AIM To develop an HPLC method for the simultaneous content determination of ginsenosides Rb1,Rd,F4,Rg1,20 (R)-Rg3,20 (S)-Rg3,Rgs,20 (R)-Rh1,20 (S)-Rh1,Rh4,Rk1,Rk3 and notoginsenoside R1 in Shusanqi Powder (processed Notoginseng Radix et Rhizoma).METHODS The analysis of 70％ methanol extract of this drug was performed on a 35 ℃ thermostatic Agilent Zorabax-C1s column (4.6 mm ×250 mm,5 μm),with the mobile phase comprising of acetonitrile-water flowing at 1.0 mL/min in a gradient elution manner,and the detection wavelength was set at 203 nm.RESULTS Thirteen saponins showed good linear relationships within their own ranges (r =0.999 5),whose average recoveries were 90.01％-108.32％ with the RSDs of 0.62％-3.54％.CONCLUSION This sensitive and accurate method can be used for the quality control of Shusanqi Powder.