Controllable Star Cationic Poly(Disulfide)s Achieve Genetically Cascade Catalytic Therapy by Delivering Bifunctional Fusion Plasmids

Abstract

The absences of effective delivery vectors and suitable multifunctional plasmids limit cancer gene therapy development. The star cationic poly(disulfide)s with β‐cyclodextrin cores (termed β‐CD‐g‐PSSn) for caveolae‐mediated endocytosis are designed and prepared via mild and controllable disulfide exchange polymerization for high‐efficacy cancer therapy. Then, β‐CD‐g‐PSSn/pDNA complexes are transported to the Golgi apparatus and endoplasmic reticulum. Disulfides in β‐CD‐g‐PSSn vectors are degraded by glutathione in tumor cells, which not only promote intracellular pDNA release but also reduce in vitro and in vivo toxicity. One bifunctional fusion plasmid pCATKR, which expresses catalase (CAT) fused to KillerRed (KR) (CATKR) in the same target cell, is also proposed for genetically cascade catalytic therapy. When compared with pCAT‐KR (plasmid expressing CAT and KR separately in the same cell), delivered pCATKR decomposes hydrogen peroxide, alleviates tumor hypoxia more effectively, generates stronger reactive oxygen species (ROS) capabilities under moderate irradiation, and leads to robust antitumor cascade photodynamic effects. These impressive results are attributed to fusion protein design, which shorten the distance between CAT and KR catalytic centers, and lead to improved ROS production efficiency. This work provides a promising strategy by delivering a catalytic cascade functional plasmid via a high‐performance vector with biodegradable and caveolae‐mediated endocytosis characteristics.This article is protected by copyright. All rights reserved

Multifunctional ZnO@DOX/ICG-LMHP Nanoparticles for Synergistic Multimodal Antitumor Activity

“…However, many malignant solid tumors have intrinsic characteristic hypoxia [11]. The hypoxic tumor microenvironment (TME) severely limits the PDT therapeutic efficacy [12,13]. To alleviate tumor hypoxia, there are many O 2 supplement strategies, such as the direct delivery of exogenous oxygen and endogenous reaction to generate O 2 in the tumor [14].…”