Nrf2 silencing amplifies DNA photooxidative damage to activate the STING pathway for synergistic tumor immunotherapy. (May 2023)

• Record Type: Journal Article
• Authors: Sun, Shengjie; Yu, Mian; Yu, Liu; Huang, Wenxin; Zhu, Meishu; Fu, Yanan; Yan, Lingchen; Wang, Qiang; Ji, Xiaoyuan; Zhao, Jing; Wu, Meiying
• Is Part Of: Biomaterials. Volume 296(2023)
• Publication Date: 2023-05
• Subjects: siRNA delivery -- DNA oxidative damage -- STING pathway -- Immunogenic cell death -- Photoimmunotherapy; Biomedical materials -- Periodicals; Biocompatible Materials -- Periodicals; Biomatériaux -- Périodiques; 610.28
• DOI: 10.1016/j.biomaterials.2023.122068
• Languages: English
• ISSNs: 0142-9612

Abstract

Abstract: Photodynamic therapy (PDT)-mediated antitumor immune response depends on oxidative stress intensity and subsequent immunogenic cell death (ICD) in tumor cells, yet the inherent antioxidant system restricts reactive oxygen species (ROS)-associated oxidative damage, which is highly correlated with the upregulated nuclear factor erythroid 2-related factor 2 (Nrf2) and the downstream products, such as glutathione (GSH). Herein, to overcome this dilemma, we designed a versatile nanoadjuvant (RI@Z-P) to enhance the sensitivity of tumor cells to oxidative stress via Nrf2-specific small interfering RNA (siNrf2). The constructed RI@Z-P could significantly amplify photooxidative stress and achieve robust DNA oxidative damage, activating the stimulator of interferon genes (STING)-dependent immune-sensing to produce interferon-β (IFN-β). Additionally, RI@Z-P together with laser irradiation reinforced tumor immunogenicity by exposing or releasing damage-associated molecular patterns (DAMPs), showing the prominent adjuvant effect for promoting dendritic cell (DC) maturation and T-lymphocyte activation and even alleviating the immunosuppressive microenvironment to some extent.