Mesoporous Silica Nanoparticle-based H2O2 Responsive Controlled-Release System Used for Alzheimer's Disease Treatment

Metal ions play important roles in amyloid aggregation and neurotoxicity. Metal-ion chelation therapy has been used in clinical trials for Alzheimer's disease (AD) treatment. However, clinical trial studies have shown that long-term use of metal chelator can cause adverse side effect, subacute myelo-optic neuropathy. Nanoparticle engineering processes have become promising approaches for efficiently drugs delivery. A series of modified meso porous silica nanoparticles (MSNs) using redox, pH, competitive binding, light, and enzyme as actuators have been demonstrated. Recently, significant advances in sensing oxidative stress have been made by taking advantage of specific chemistry between cellular oxidants such as H2O2. Here we report a biocompatible delivery platform by using H2O2 responsive controlled-release system to realize target delivery of AD therapeutic metal chelator. The advantage of this novel strategy is that metal chelator can only be released by the increased levels of H2O2, thus, it would not interfere with the healthy metal homeostasis and can overcome strong side effect of metal chelator after long-term use. By taking advantage of the good biocompatibility, cellular uptake properties, and efficient intracellular release of metal chelators, the delivery system is promising for future in vivo controlled-release biomedical applications.