Construction of a redox-responsive drug delivery system utilizing the volume of AS1411 spatial configuration gating mesoporous silica pores

In recent years, diverse redox-responsive drug delivery systems have emerged to prevent premature drug release and reduce drug toxicity in the human body in cancer treatment. In this paper, we put forward a view of directly utilizing the spatial structure size of the AS1411 aptamer as the nano-gatekeeper on the pore openings of MCM-41 type mesoporous silica and thus constructed a redox-responsive drug delivery system named MCM-41-SS-AS1411. The particles obtained at each step were characterized by TEM, FTIR, SXRD, TGA and zeta potential measurement. The characterization data confirmed that the particles were successfully prepared. The binding amount of the aptamer was ca. 3.1 x 10(3) for each carrier particle averagely. The anticancer drug Dox was regarded as a drug model to investigate the redox-controlled drug release behavior by fluorescence measurements. The investigation results demonstrate that the spatial volume of aptamer AS1411 can block the mesopore, and this drug-carrier can realize controlled drug release by GSH. We hope this idea can play a prompt role in relevant research. Meanwhile, the preparation steps of this DDS are simplified.