文獻名： Targeted Delivery of MicroRNA12-5p by Engineered Lipid Nanoparticles for the Treatment of HER2 Positive Metastatic Breast Cancer

作者： Hayward, Stephen L.; Francis, David M.; Kholmatov, Parviz; Kidambi, Srivatsan

摘要：MicroRNAs (miRNAs) are endogenous regulators of gene expression that play a pivotal role in biological processes spanning from global homeostasis to disease onset and progression. The ability to manipulate and induce cellular reequilibrium of deregulated miRNA expression profiles by inhibition of oncogenic miRNA or overexpression of tumor suppressor miRNA is a promising cancer strategy, but is currently hindered in application by the lack of nonviral delivery systems. Here we present a lipid nanoparticle (LNP) platform surface coated with Hyaluronic Acid (HA) for the delivery of mature tumor suppressor MicroRNA12-5p to treat HER2 positive metastatic breast cancer. The delivery platform actively targets patient-derived metastatic breast cancer cells (21MT-1) isolated from the metastatic pleural effusion over normal breast tissue via an intrinsic HA-CD44 mediated endocytosis event, and has the ability to escape from the intracellular endolysosomal pathway for potent gene silencing. Knockdown of the HER2 proto-oncogene at the level of transcription and translation was achieved following HA-LNP mediated transfection with MicroRNA12-5p. In addition, the PI3K/AKT and MAPK hyperactivated signaling pathways, cellular proliferation, and migration potential were also potently suppressed. Furthermore, the therapeutic efficacy of MicroRNA12-5p by the HA-LNP platform was demonstrated to be significantly improved as compared to a commercial transfection reagent. This study highlights the therapeutic potential of MicroRNA12-5p as a standalone treatment of HER2+ metastatic breast cancer via a translational nonviral delivery platform. These findings have major implications on future gene therapy regimens for breast cancer.

關鍵詞：BREAST CANCER; GENE DELIVERY; HER2 TARGETING; HYALURONIC ACID; LIPID NANOPARTICLES; LIPOSOMES; MICRORNA