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Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
Published on: May 2, 2019
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Heterofunctional Cationic Polyester Dendrimers as Potent Nonviral Vectors for siRNA Delivery
Arunika Singh1, Ángel Buendía2,3, Irene Rodríguez-Clemente2,3
1Division of Coating Technology, Fiber and Polymer Technology, KTH, Teknikringen 48, SE-10044 Stockholm, Sweden.
Pharmaceutics
|November 27, 2025
Summary
New biodegradable dendrimers efficiently deliver siRNA for cancer therapy. These novel cationic polyester carriers show high complexation, excellent nuclease resistance, and minimal toxicity, improving gene silencing in glioblastoma cells.
Area of Science:
- Polymer Chemistry
- Nanotechnology
- Biomedical Engineering
Background:
- Development of biodegradable nonviral vectors for siRNA delivery is crucial for gene therapy.
- Polyester dendrimers offer tunable properties for drug and nucleic acid delivery applications.
- Existing dendrimer scaffolds face challenges in efficiency and stability for siRNA complexation.
Purpose of the Study:
- To evaluate heterofunctional cationic polyester dendrimers as efficient and biodegradable nonviral carriers for siRNA delivery.
- To investigate the impact of dual internal and external charge architectures on siRNA interaction.
- To compare the performance of these novel dendrimers against existing scaffolds and commercial reagents.
Main Methods:
- Synthesis of heterofunctional cationic polyester dendrimers using a BHP-diol based AB2C monomer.
- Characterization of dendrimer architecture and charge distribution.
- Assessment of siRNA complexation efficiency (N/P ratios) and RNase protection.
- Evaluation of cytotoxicity and gene silencing efficacy in human (T98G) and murine (GL261) glioblastoma cells.
Main Results:
- Complete siRNA complexation achieved at low N/P ratios (0.50-2.14).
- Up to 93% RNase protection demonstrated, superior to amino-functional scaffolds.
- Achieved 52-61% target protein knockdown in glioblastoma cells, outperforming conventional dendrimers.
- Exhibited minimal cytotoxicity, comparable to commercial siRNA delivery reagents.
Conclusions:
- Heterofunctional cationic polyester dendrimers are highly efficient and biodegradable siRNA delivery vectors.
- The dual charge architecture enables precise control over siRNA interaction and stability.
- These dendrimers represent a promising new generation of tunable vectors for therapeutic siRNA delivery with improved biocompatibility and efficacy.
