文献名:

Effect of surface charge and density of istearylphosphatidylethanolamine-mPEG-2000 (DSPE-mPEG-2000) on the cytotoxicity of liposome-entrapped ricin: Effect of lysosomotropic agents

文献链接：

https://doi.org/10.1016/j.ijpharm.2007.08.032

实验使用方法:

脂质体制备

Liposomes composed of soya phosphatidyl choline andcholesterol in a molar ratio of 55:45 were prepared by handshaken method. Briefly, the lipids (40 pmol total lipids)weredissolved in chloroform in a 100ml round bottom fask. Thechloroform was evaporated to dryness at 37°C, under reducedpressure by using rotary evaporator (Wheaton). The thin filmso formed, was desiccated for 1 h, followed by hydration with1 ml PBS (20 mM, pH 7.4), containing ricin (3 mg/ml) and traceamounts of 125]-ricin as aqueous phase marker. The round bot-tom fask containing liposomes suspension was stored, underN2 atmosphere to avoid lipid oxidation, at 4C for overnight forcomplete hydration. The following day, liposomes were soni-cated in a bath type sonicator (Branson) at 25 °C for 30 min in10 min batches to avoid the heat generation. Negatively and positivelycharged liposomes containing ricin were preparedexactlyas described above only 10 mol% either phosphatidic acid (PA)or stearylamine (SA) were added during the preparation of lipidflm. Sterically stabilized liposomes containing ricin were pre-pared as described above by adding various (1-7.5 mol%) ofDSPE-mPEG-2000 during the preparation of lipid film.

重要检测:

重要实验结果说明

examined. As shown in Fig. 5 when cells were treated with150 ng/ml free ricin a lag period of 45 min was observed withtso (time required to achieve 50% reduction in protein synthe-sis) of 200 min. It was observed that the lag period of inhibitionof protein synthesis by ricin is significantly increased followingdelivery through different charged liposomes. At 10 pg/ml ofvarious charged liposomal ricin, a lag phase of 4 h was observedfor neutral and negatively charged liposomes, on the other hand.a lag phase of 2h was observed for positively charged lipo-somes. Monensin (50 nm) reduced the lag period of free ricinfrom 45 to 15 min (i.e., three-fold reduction of the lag period),however, in the presence of monensin, the lag period of neutraland negatively chargedliposomal ricin was reduced from 4 to 1 h(four-fold reduction of lag period) and 2 h (two-fold reductionoflag period), respectively. The lag period of positively chargedliposomal ricin was reduced from 2 to 1 h (two-fold reductionof lag period). These results implied that monensin causes anenhanced and efficient release of ricin A-chain from liposomalricin located in an intracellular compartment into the cytosolleading to the rapid onset of the inhibition of protein synthesis.

 我们提供peg相关产品，仅供科研，如有需要，欢迎咨询！
以上资料由小编zhn提供，仅用于科研


关于我们 ：
西安瑞禧生物科技有限公司专业从事生物医药材料的研发与生产，提供多种规格和类型的聚乙二醇（PEG）及其衍生物。其产品涵盖线性PEG、支链PEG、多官能PEG、活性基团修饰PEG（如-COOH、-NH2、-SH、NHS、Mal等）以及脂质修饰类PEG（如DSPE-PEG、Cholesterol-PEG）等，广泛应用于药物递送系统、抗体偶联、纳米材料修饰、生物成像和组织工程等领域。瑞禧生物可根据客户需求定制不同分子量、不同官能团的PEG产品，确保产品质量稳定、纯度高、反应活性强，满足科研及产业化应用需求。


相关产品：           
CGKRK-PEG-DSPE
Xpeptide-PEG-DSPE
Asp6-PEG-DSPE
BR2-PEG-DSPE
CSTSMLKAC-PEG-DSPE
GPC3靶向肽-PEG-DSPE
Peptides PEG PLGA
cRGD-PEG-PLGA