A Combination RNAi-Chemotherapy Layer-by-Layer Nanoparticle for Systemic Targeting of KRAS/P53 with Cisplatin to Treat Non-Small Cell Lung Cancer

Purpose: Mutation of the Kirsten ras sarcoma viral oncogene homolog (KRAS) and loss of p53 function are commonly seen in patients with non-small cell lung cancer (NSCLC). Combining therapeutics targeting these tumor-defensive pathways with cisplatin in a single-nanoparticle platform are rarely developed in clinic. Experimental Design: Cisplatin was encapsulated in liposomes, which multiple polyelectrolyte layers, including siKRAS and miR-34a were built on to generate multifunctional layerby- layer nanoparticle. Structure, size, and surface charge were characterized, in addition to in vitro toxicity studies. In vivo tumor targeting and therapy was investigated in an orthotopic lung cancer model by microCT, fluorescence imaging, and immunohistochemistry. Results: The singular nanoscale formulation, incorporating oncogene siKRAS, tumor-suppressor stimulating miR-34a, and cisplatin, has shown enhanced toxicity against lung cancer cell line, KP cell. In vivo, systemic delivery of the nanoparticles indicated a preferential uptake in lung of the tumor-bearingmice. Efficacy studies indicated prolonged survival of mice from the combination treatment. Conclusions: The combination RNA-chemotherapy in an LbL formulation provides an enhanced treatment efficacy against NSCLC, indicating promising potential in clinic.(C) 2017 AACR.