Peptide-based siRNA delivery system for tumor vascular normalization and gene silencing in 4T1 cells

Efficient gene delivery in an integrated drug delivery system is urgent for multimodal antitumor therapy. Herein, we describe a protocol for constructing a peptide-based siRNA delivery system to achieve tumor vascular normalization and gene silencing in 4T1 cells. We highlighted four major steps, including (1) synthesis of the chimeric peptide, (2) preparation and characterization of PA7R@siRNA micelleplexes, (3) in vitro tube formation assay and transwell cell migration assay, and (4) siRNA transfection in 4T1 cells. This delivery system is expected to be used to silence gene expression, normalize tumor vasculature, and perform other treatments based on the different peptide segments. For complete details on the use and execution of this protocol, please refer to Yi et al. (2022).1