Emergence of a Cell-Guided Multivalent Ligand of Enzymes on Cancer Cells Triggered by Click Reaction between Hetero Nano-Assemblies
Stimuli-responsive nanomaterials with multivalent ligands have attracted significant attention in the context of cancer chemotherapy and imaging. However, challenges remain such as non-selective stimuli response and/or existence of triggers in healthy regions in addition to the intrinsic heterogeneity of cancer that causes insufficient target recognition. In-spired by the expression of precise and diverse functions of biological machineries triggered by specific protein-protein complexation and conformational change, we report an artificial system where a bioorthogonal click reaction between hetero-nano-assemblies triggers their complexation and conformational changes, resulting in emergence of multivalent ligands for cancer-associated enzymes: carbonic anhydrase IX (CAIX). We also demonstrated that the multivalent ligands selectively inhibited the proliferation of cancer cells overexpressing CAIX under hypoxic conditions. Additionally, the click reaction between nano-assemblies in the presence of target cells provided a higher efficacy of the emerged multivalent ligands than that pre-formed in the absence of cells. Our study provides a basis for the development of multivalent ligands displaying adaptive binding interfaces for target cancer cells with high selectivity and affinity to thus potentially overcome tumor heterogeneity.