Autophagy is a self-protection process against reactive oxygen species (ROS). The intracellular level of ROS increased when cells were cultured under nutrient starvation. Antioxidants such as glutathione and ascorbic acid play an important role in ROS removal.
View Article and Find Full Text PDFWe synthesized a biothiol-sensitive nanoprobe by assembling gold nanoparticles with a novel redox-responsive silica (ReSi) matrix using dithiobis (succinimidyl propionate) and (3-aminopropyl) trimethoxysilane. Thin layer disulfide-bonded networks of the ReSi could differentially respond to extra- and intracellular glutathione in cancer cells within 30 min; furthermore, targeted cellular uptake could be monitored in situ by fluorescence recovery. Sigmoidal dose-response pattern of the nanoprobes presented in this study were attributed to the buried disulfide-linked 3D nanostructure of the ReSi nanoshell, optimized at an appropriate thickness, enabling not only buffering of small redox disturbances in the extracellular milieu but also the satisfied sensitivity for rapid redox sensing.
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