The Application of Targeted Nanodrugs with Dual Responsiveness of PH and Ros in Preventing and Treating Vascular Restenosis

In order to study the application of PH- and Ros-responsive targeted nanodrugs in preventing and treating vascular restenosis, a method based on pH-responsive and reactive oxygen species- (ROS-) responsive carrier materials synthesized in the early stage and rapamycin as a model drug was proposed. This method evaluated the therapeutic advantages of PH and Ros dual-responsive nanoparticles and the effect of dual-responsive active targeted drug delivery nanoparticles on vascular restenosis in vivo by comparing with nonresponsive PH or Ros single responsive nanotherapy. By optimizing the feed mass ratio of pH-responsive materials (ACD) and ROS-responsive materials (OCD), the best pH and ROS responsive nanoparticles were prepared. It has been proved that nanoparticles have ultrasmall volume (10–1000 nm) and can easily pass through the blood vessel wall without causing damage and have the characteristics of targeting and sustained release, so they are an ideal carrier for local administration. Nanoparticles as gene vectors have also achieved good results.