[Increase of gentamicin uptake in cultured mouse peritoneal macrophage and rat hepatocytes when used in the form of nanoparticles].

The polybutylcyanoacrylate nanoparticles of 3H-labeled gentamicin were prepared in order to investigate the possibility of gentamicin nanoparticles as an intracellular drug delivery system for intracellular chemotherapy. The 3H-labeled gentamicin nanoparticles were incubated with mouse peritoneal macrophage (MPM) or rat hepatocytes (RH) for some period, then the cells were separated from the nanoparticles, and finally the radioactivity (cpm) of 3H in the cells were measured by a liquid scintillation counter. By comparison with the solution of 3H-labeled gentamicin, a 6.34 times increase of cpm value in MPM after 30 min incubation, and 27.74, 9.03 and 8.36 times increase of MPM values in RH after 1, 12, and 24 h incubation respectively, were observed by binding gentamicin with polybutylcyanoacrylate nanoparticles. The particle size, surfactant coating, stabilizer and the gentamicin concentration were found to have some effect on the uptake of nanoparticles by two kinds of cells. This study provided a basis for the screening of intracellular drug delivery system.