表面电荷对聚乙二醇修饰金纳米粒子生物行为的影响

利用硫-金键将末端修饰甲氧基、氨基或羧基的巯基化聚乙二醇(Thiolated polyethylene glycol,HS-PEG)分子分别组装到金纳米粒子表面, 合成了3种带有不同表面电荷的聚乙二醇修饰金纳米粒子(PEGylated gold nanoparticles,PEG-Au NP).细胞共培养和小鼠尾静脉注射实验结果表明,表面电荷能够显著影响PEG-Au NP的生物行为.细胞对PEG-Au NP的吞噬量遵循正电荷＞电中性＞负电荷的规律.尾静脉注射的PEG-Au NP能够随小鼠的血液循环由全器官分布逐渐向肝脾转移.表面带负电荷的PEG-Au NP较难被小鼠肝脾清除,带但正电荷的PEG-Au NP能够引起小鼠免疫系统较强的响应.

Effect of Surface Charge on Biobehavior ofPEGylated Gold Nanoparticles

Three kinds of PEGylated gold nanoparticles (PEG-Au NPs) with different surface charges are prepared by assembly of thiolated polyethylene glycol (HS-PEG) with different terminal groups including methoxy, amino or carboxyl on gold nanoparticle surface through sulfur-gold covalent bond, respectively.The experimental results of cell co-culturing and tail intravenous injection in mouse indicate that the biological behaviors of PEG-Au NPs are affected significantly by their surface charges.The cellular internalization amounts of PEG-Au NPs are following the order, positive charge ＞ neutral charge ＞ negative charge.The PEG-Au NPs are gradually transferred to liver and spleen from main organs through the circulation of blood after tail intravenous injection in mouse.The negatively charged PEG-Au NPs have the slowest hepatic clearance rate while the positively charged PEG-Au NPs can cause the strongest response of immune system in mice.