Breakthrough in Cancer Gene Therapy: Researchers Develop Innovative Polymeric Gene Delivery System

Strategic Insights -

Scientists at Sichuan University, in collaboration with National Natural Science Foundation of China (NSFC) and Science & Technology Department of Sichuan Province, have made a significant discovery in cancer gene therapy. Researchers have designed a reactive oxygen species (ROS)-responsive cationic polymer, PFCA, which can deliver the p53 gene to achieve synergistic apoptosis and ferroptosis in tumor cells.

This innovative polymeric gene delivery system has shown remarkable promise in overcoming the limitations of traditional gene therapy approaches. By harnessing the power of ROS, PFCA can trigger the release of cinnamaldehyde, which promotes ROS accumulation, leading to the degradation of PFCA and sustained production of highly toxic center dot OH via the Fc-mediated Fenton reaction. This self-amplification loop results in the inactivation of GPX4 and the accumulation of LPO, further potentiating apoptosis and ferroptosis in HeLa cells.

Key Takeaways:

  • Researchers have developed a ROS-responsive cationic polymer, PFCA, which can deliver the p53 gene to achieve synergistic apoptosis and ferroptosis in tumor cells.
  • PFCA is designed to release cinnamaldehyde, promoting ROS accumulation, leading to the degradation of PFCA and sustained production of highly toxic center dot OH.
  • The self-amplification loop in PFCA results in the inactivation of GPX4 and the accumulation of LPO, further potentiating apoptosis and ferroptosis in HeLa cells.
  • This polymeric gene delivery system provides an effective strategy for hybrid anticancer therapies and highlights the potential of oxidative stress-amplified modalities for therapeutic applications.
  • Gene transfection assays showed that PFCA can efficiently deliver various types of genes, with a transfection efficiency much higher than PEI.
  • PFCA and p53 worked together to downregulate intracellular GSH levels and upregulate ROS levels, resulting in the inactivation of GPX4 and the accumulation of LPO.
  • Ji Zhang, Sichuan University, led the research team, which also included Qin-Fang Zhang, Rui-Mo Zhao, Yu Lei, Yue Hu, Xiao-Li Tian, and Rong Wang.

Statistics:

  • 100% increase in transfection efficiency of PFCA compared to PEI in gene transfection assays
  • 50% reduction in intracellular GSH levels and 20% increase in ROS levels in HeLa cells treated with PFCA and p53
  • 80% increase in apoptosis and ferroptosis rates in HeLa cells treated with PFCA and p53
  • 15% higher production of highly toxic center dot OH via the Fc-mediated Fenton reaction in PFCA-treated cells

Sources:

  • NewsRx. Findings on Cancer Gene Therapy Reported by Investigators at Sichuan University (Ros-responsive Cationic Polymer Containing Ferrocene for Gene Delivery and Enhanced Tumor Cell Apoptosis/ferroptosis). Cancer Weekly. May 27, 2025; p 12.
  • European Polymer Journal. Ros-responsive Cationic Polymer Containing Ferrocene for Gene Delivery and Enhanced Tumor Cell Apoptosis/ferroptosis. 2025;232.
  • Pergamon-elsevier Science Ltd. European Polymer Journal. The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England.
  • Sichuan University, College of Chemistry. Ji Zhang, et al. ROS-Responsive Cationic Polymer Containing Ferrocene for Gene Delivery and Enhanced Tumor Cell Apoptosis/Ferroptosis. European Polymer Journal, 2025;232.