Precisely Engineered Block Copolymers for Efficient PTEN mRNA Therapy of Non-Small Cell Lung Cancer

Area of Science:

• Biomaterials Science
• Oncology
• Nanotechnology

Background:

• Restoring PTEN tumor suppressor function is a key strategy for nonsmall cell lung cancer (NSCLC) treatment.
• mRNA therapy offers a safe and specific alternative for gene therapy, but requires efficient delivery systems.
• Developing effective delivery vehicles is crucial for the clinical translation of mRNA therapeutics.

Purpose of the Study:

• To design and optimize a diblock copolymer for efficient PTEN mRNA delivery in NSCLC.
• To evaluate the in vitro and in vivo performance of the developed mRNA delivery system.
• To assess the therapeutic efficacy and safety of PTEN mRNA delivery for NSCLC treatment.

Main Methods:

• Synthesis and characterization of a diblock copolymer composed of PEG and a cationic block with AAPBA and DMAPMA units.
• Optimization of copolymer structure, including PEG chain length, for enhanced delivery properties.
• In vitro studies on cellular uptake, endosomal escape, and mRNA release; in vivo studies involving tumor inhibition and toxicity assessments after FA functionalization.

Main Results:

• The optimized copolymer PEG₄₅-b-P(AAPBA₂₁-co-DMAPMA₁₈) demonstrated balanced delivery properties, including improved cellular uptake and endosomal escape.
• The FA-functionalized copolymer successfully restored PTEN expression in NSCLC models.
• Significant inhibition of tumor growth (81.0% reduction) was observed in vivo with no significant toxicity.

Conclusions:

• The rationally designed diblock copolymer serves as an effective platform for PTEN mRNA delivery.
• This approach shows promise for the development of novel mRNA-based therapeutics for NSCLC.
• The study highlights the potential of tailored block copolymers for targeted cancer gene therapy.