Multi‐Targeted and On‐Demand Non‐Coding RNA Regulation Nanoplatform against Metastasis and Recurrence of Triple‐Negative Breast Cancer

Abstract Dysregulation of microRNAs (miRs) is the hallmark of triple‐negative breast cancer (TNBC), which is closely involved with its growth, metastasis, and recurrence. Dysregulated miRs are promising targets for TNBC therapy, however, targeted and accurate regulation of multiple disordered miRs in tumors is still a great challenge. Here, a multi‐targeting and on‐demand non‐coding RNA regulation nanoplatform (MTOR) is reported to precisely regulate disordered miRs, leading to dramatical suppression of TNBC growth, metastasis, and recurrence. With the assistance of long blood circulation, ligands of urokinase‐type plasminogen activator peptide and hyaluronan located in multi‐functional shells enable MTOR to actively target TNBC cells and breast cancer stem cell‐like cells (BrCSCs). After entering TNBC cells and BrCSCs, MTOR is subjected to lysosomal hyaluronidase‐induced shell detachment, leading to an explosion of the TAT‐enriched core, thereby enhancing nuclear targeting. Subsequently, MTOR could precisely and simultaneously downregulate microRNA‐21 expression and upregulate microRNA‐205 expression in TNBC. In subcutaneous xenograft, orthotopic xenograft, pulmonary metastasis, and recurrence TNBC mouse models, MTOR shows remarkably synergetic effects on the inhibition of tumor growth, metastasis, and recurrence due to its on‐demand regulation of disordered miRs. This MTOR system opens a new avenue for on‐demand regulation of disordered miRs against growth, metastasis, and recurrence of TNBC.