Breakthrough in Cancer Gene Therapy: Star-Shaped Copolypeptide-Mediated Transfection of 3D Organoids

Scientists at National Cheng Kung University in Tainan, Taiwan, have made a groundbreaking discovery in the field of cancer gene therapy. A new study published in the European Polymer Journal reveals the development of star-shaped block copolypeptides as novel gene carriers capable of directly transfecting entire cell clusters within three-dimensional (3D) organoid models. This innovative approach has the potential to overcome the significant hurdles of efficient and targeted gene delivery, offering hope for treating genetic disorders and cancer.

Key Takeaways:

• The study introduces star-shaped block copolypeptides as novel gene carriers that can directly transfect entire cell clusters within 3D organoid models, demonstrating a high transfection efficiency that rivals commercial standards.
• The research team synthesized star-shaped poly(L-lysine)-block-poly(L-alanine) (s-PLL-PLA) polypeptides with various arm numbers and evaluated their potentiality as non-viral gene carriers.
• Experimental results showed that the transfection efficiency of s-PLL-PLA/plasmid polyplexes rivaled that of Lipofectamine 2000, a commercial standard, emphasizing the importance of using 3D organoids to mimic the structure and function of native tissues.
• The s-PLL-PLA polypeptides exhibited amphiphilicity and steric hindrance imposed by the presence of rigid, hydrophobic PLA segment on the star architecture, rendering improved biocompatibility and transfection efficiency due to charge shielding and less dense packing with plasmids.
• By targeting HSP90 AB1, an oncogene associated with aggressive cancer progression and poor patient outcomes, the s-PLL-PLA/short hairpin RNA (shRNA) polyplexes exhibited potent anticancer efficacy via effective suppression of MDA-MB231 breast cancer cell proliferation and induction of apoptosis.
• The researchers concluded that these findings strongly suggest that sPLL-PLA polypeptides hold promise as effective non-viral gene delivery systems for inducing cancer cell apoptosis.

Statistics:

• 3D organoids were used to mimic the structure and function of native tissues, demonstrating the importance of using this model in gene therapy research.
• The s-PLL-PLA polypeptides showed a high transfection efficiency, with results rivalling those of the commercial standard Lipofectamine 2000.
• The study targeted HSP90 AB1, an oncogene associated with aggressive cancer progression and poor patient outcomes, using the s-PLL-PLA/shRNA polyplexes.
• The research was supported by the National Science and Technology Council, Taiwan (NSTC).
• The study has been peer-reviewed and published in the European Polymer Journal.

Sources:

• NewsRx. Report Summarizes Cancer Gene Therapy Study Findings from National Cheng Kung University (Star-shaped Copolypeptide-mediated Transfection of 3d Organoids). Cancer Weekly. May 27, 2025; p 24.
• European Polymer Journal. (2025;232).