Arsenene-mediated multiple independently targeted reactive oxygen species burst for cancer therapy

The modulation of intracellular reactive oxygen species (ROS) levels is crucial for cellular homeostasis and determination of cellular fate. A sublethal level of ROS sustains cell proliferation, differentiation and promotes tumor metastasis, while a drastic ROS burst directly induces apoptosis. Herein, surface-oxidized arsenene nanosheets (As/As(x)O(y) NSs) with type II heterojunction are fabricated with efficient ·O(2)(−) and (1)O(2) production and glutathione consumption through prolonging the lifetime of photo-excited electron-hole pairs. Moreover, the portion of As(x)O(y) with oxygen vacancies not only catalyzes a Fenton-like reaction, generating ·OH and O(2) from H(2)O(2), but also inactivates main anti-oxidants to cut off the “retreat routes” of ROS. After polydopamine (PDA) and cancer cell membrane (M) coating, the engineered As/As(x)O(y)@PDA@M NSs serve as an intelligent theranostic platform with active tumor targeting and long-term blood circulation. Given its narrow-band-gap-enabled in vivo fluorescence imaging properties, As/As(x)O(y)@PDA@M NSs could be applied as an imaging-guided non-invasive and real-time nanomedicine for cancer therapy.