siRNA nanocarriers based on methacrylic acid copolymers
Arnaud E Felber1, Bastien Castagner, Mahmoud Elsabahy
1Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, Wolfgang-Pauli Str. 10, 8093 Zurich, Switzerland.
Summary
Targeted nanoparticles deliver siRNA to cancer cells, effectively silencing Bcl-2. This pH-responsive system enhances therapeutic delivery and reduces required dosage.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Molecular Biology
Background:
- Polymeric micelles offer potential for targeted drug delivery.
- pH-responsive systems are crucial for endosomal escape and intracellular drug release.
- Gene silencing via small interfering RNA (siRNA) holds therapeutic promise.
Purpose of the Study:
- To develop pH-sensitive polyion complex micelles (PICMs) for targeted siRNA delivery.
- To functionalize PICMs with anti-CD71 antibody fragments for enhanced cellular uptake.
- To evaluate the efficacy of targeted PICMs in downregulating Bcl-2 expression in prostate cancer cells.
Main Methods:
- Synthesis and characterization of PEG-b-P(PrMA-co-MAA) and PAMAM dendrimers.
- Formation and size analysis of PICMs loaded with siRNA.
- Conjugation of anti-CD71 antibody fragments to PICMs using maleimide chemistry.
- Flow cytometry analysis of cellular uptake in PC-3 cells.
- Quantitative assessment of Bcl-2 mRNA and protein levels via RT-qPCR and Western blot.
Main Results:
- PICMs with controlled sizes (50-100 nm) were successfully prepared.
- Anti-CD71 decorated PICMs showed significantly enhanced cellular uptake compared to non-targeted micelles.
- Targeted PICMs effectively reduced Bcl-2 mRNA and protein expression in PC-3 cells.
- Chemically modified siRNA demonstrated optimal gene silencing efficacy.
Conclusions:
- Targeted, pH-responsive PICMs are effective delivery vehicles for siRNA.
- Anti-CD71 functionalization enhances cellular internalization and therapeutic payload delivery.
- Optimized siRNA chemistry combined with effective delivery systems can potentiate gene silencing, potentially reducing therapeutic doses.
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