De novo fabrication of biomineralized Au nanorod@enzymes@ZIF-8 nanocomposites for enhanced enzymatic biocascade reaction in cancer cell

In order to efficiently keep activities of enzymes and enhance stabilities of enzymes, intercalation of enzymes into core of Au nanorod and MOFs shell has been designed. Vice versa, enzymes immobilized on the surface of Au nanorod can guide MOFs shell growth via biomineralization interplay accompany with surfactant directed growth of MOFs on an anisotropic plasmonic template, leading to formation of a porous layer-by-layer nanostructure. Due to incorporation of stimuli-responsive enzyme and MOFs skeleton, loaded anticancer drug can be efficiently released under endogenous stimuli. In-situ SERS and UV-Vis analysis indicate that porous Au nanorod@enzymes@ZIF-8 nanocomposites can perform superior drug releasing behavior compared to Au nanorod@ZIF-8. Hence, the porous Au nanorod@enzymes@ZIF-8 nanocomposites can give more efficient enzymatic biocascade reaction in the nanoreactor in contrast with Au nanorod@ZIF-8@enzymes. Based on porous characteristics of ZIF-8 shell in the Au nanorod@enzymes@ZIF-8 nanocomposites, the nanocomposites can cause complete apoptosis of HeLa cell via enzymatic biocascade reaction and loaded anticancer drug. It can be expected that the unique biological-inorganic-organic hybridized nanosystem would be extensively applied in quantitative evaluation of multi-modal tumor therapy.