A Novel CRISPR/Cas9‐Encapsulated Biomimetic Manganese Sulfide Nanourchins for Targeted Magnetic Resonance Contrast Enhancement and Self‐Enhanced Chemodynamics‐Gene‐Immune Synergistic Tumor Therapy.

CRISPR/Cas9 gene editing systems are widely studied in cancer therapy, however, it is still challenging to improve the gene editing efficiency and enhance the anticancer efficacy. Herein, a novel self‐assembled manganese sulfide nanourchin with CRISPR/Cas9 and hybrid membrane encapsulation (MCRT) is developed to highlight the synergistic mechanism of hydrogen sulfide (H2S) and CRISPR/Cas9 in cancer therapy. The special structure and cationic surface of nanourchins facilitate the loading of CRISPR/Cas9 with the large size and the encapsulation of erythrocyte‐tumor cell hybrid membrane, endowing the nanoplatform with long circulation and precise tumor targeting. MCRT with pH‐response can effectively decompose into H2S and Mn2+, and release CRISPR/Cas9 in acidic tumor microenvironment. H2S can up‐regulate intracellular hydrogen peroxide level by inhibiting the activity of catalase, which enables self‐enhanced chemodynamic therapy (CDT) of Mn2+. In addition, H2S can synergize with the released CRISPR/Cas9, co‐downregulating the level of intracellular anti‐apoptotic protein survivin, achieving self‐enhanced gene therapy. Furthermore, systemic delivery of MCRT displays significantly tumor magnetic resonance imaging (MRI) contrast enhancement. Importantly, H2S‐enhanced CDT‐gene therapy simultaneously induces immunogenic cell death and triggered a robust anti‐tumor immune response. Thus, MCRT has a potential application for the targeted MRI and self‐enhanced CDT‐gene‐immune synergistic tumor therapy. [ABSTRACT FROM AUTHOR]