Body distribution and in situ evading of phagocytic uptake by macrophages of long-circulating poly (ethylene glycol) cyanoacrylate-co-nhexadecyl cyanoacrylate nanoparticles  

作　　者：Min HUANG Wei WU Jun QIAN Dan-jing WAN Xiu-li WEI Jian-hua ZHU 

机构地区：[1]School of Pharmacy Fudan University, Shanghai 200032, China

出　　处：《Acta Pharmacologica Sinica》2005年第12期1512-1518,共7页中国药理学报（英文版）

基　　金：Project supported by the Shanghai Municipal Committee of Science and Technology(Grant No 0243nm067);the Shanghai Education Bureau for Excellent Young High Education Teacher Candidates(Grant No 03YQHB008).

摘　　要：Aim： To investigate the body distribution in mice of [^14C]-labeled poly methoxyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate （PEG-PHDCA） nanoparticles and in situ evading of phagocytic uptake by mouse peritoneal macrophages. Methods： PEG-PHDCA copolymers were synthesized by condensation of methoxypolyethylene glycol cyanoacetate with [^14C]-hexadecylcyanoacetate. [^14C]-nanoparticles were prepared using the nanoprecipitation/ solvent diffusion method, while fluorescent nanoparticles were prepared by incorporating rhodamine B. In situ phagocytic uptake was evaluated by flow cytometry. Body distribution in mice was evaluated by determining radioactivity in tissues using a scintillation method. Results： Phagocytic uptake by macrophages can be efficiently evaded by fluorescent PEG-PHDCA nanoparticles. After 48 h, 31% of the radioactivity of the stealth [^14C]-PEG-PHDCA nanoparticles after iv injection was still found in blood, whereas non-stealth PHDCA nanoparticles were cleaned up from the bloodstream in a short time. The distribution of stealth PEG-PHDCA nanoparticles and non-stealth PHDCA nanoparticals in mice was poor in lung, kidney, and brain, and a little higher in hearts. Lymphatic accumulation was unusually high for both stealth and non-stealth nanoparticles, typical of lymphatic capture. The accumulation of stealth PEG-PHDCA nanoparticles in the spleen was 1.7 times as much as that of non-stealth PHDCA （P〈0.01）. But the accumulation of stealth PEG-PHDCA nanoparticles in the liver was 0.8 times as much as that of non-stealth PHDCA （P〈0.05）. Conclusion： PEGylation leads to long-circulation of nanoparticles in the bloodstream, and splenotropic accumulation opens up the potential for further development of spleen-targeted drug delivery.Aim： To investigate the body distribution in mice of [^14C]-labeled poly methoxyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate （PEG-PHDCA） nanoparticles and in situ evading of phagocytic uptake by mouse peritoneal macrophages. Methods： PEG-PHDCA copolymers were synthesized by condensation of methoxypolyethylene glycol cyanoacetate with [^14C]-hexadecylcyanoacetate. [^14C]-nanoparticles were prepared using the nanoprecipitation/ solvent diffusion method, while fluorescent nanoparticles were prepared by incorporating rhodamine B. In situ phagocytic uptake was evaluated by flow cytometry. Body distribution in mice was evaluated by determining radioactivity in tissues using a scintillation method. Results： Phagocytic uptake by macrophages can be efficiently evaded by fluorescent PEG-PHDCA nanoparticles. After 48 h, 31% of the radioactivity of the stealth [^14C]-PEG-PHDCA nanoparticles after iv injection was still found in blood, whereas non-stealth PHDCA nanoparticles were cleaned up from the bloodstream in a short time. The distribution of stealth PEG-PHDCA nanoparticles and non-stealth PHDCA nanoparticals in mice was poor in lung, kidney, and brain, and a little higher in hearts. Lymphatic accumulation was unusually high for both stealth and non-stealth nanoparticles, typical of lymphatic capture. The accumulation of stealth PEG-PHDCA nanoparticles in the spleen was 1.7 times as much as that of non-stealth PHDCA （P〈0.01）. But the accumulation of stealth PEG-PHDCA nanoparticles in the liver was 0.8 times as much as that of non-stealth PHDCA （P〈0.05）. Conclusion： PEGylation leads to long-circulation of nanoparticles in the bloodstream, and splenotropic accumulation opens up the potential for further development of spleen-targeted drug delivery.

关 键 词：nanotechnology tissue distribution polyethylene glycols cynoacrylates polymers SPLEEN 

分 类 号：R96[医药卫生—药理学] R329.2[医药卫生—药学]