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Updated: Aug 6, 2026
09:09
Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
Published on: May 2, 2019
Active pH Modulation by Proton Channel-Peptide Nucleic Acid Complex for Effective siRNA Endosomal Escape
Seongmin Ga1,2, Nam Hyeong Kim1,2,3, Si Yeon Ryu1,2
1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|July 23, 2026
Summary
Researchers developed a Channel-PNA-siRNA (CPR) complex to overcome lysosomal degradation and improve gene therapy. This nanocarrier enhances small interfering RNA (siRNA) delivery by promoting endosomal escape for better bioavailability.
Area of Science:
- Biotechnology
- Molecular Biology
- Nanomedicine
Background:
- Lysosomal degradation limits the bioavailability of small interfering RNA (siRNA) therapeutics.
- Effective delivery of siRNA is crucial for treating genetic diseases.
Purpose of the Study:
- To design a novel nanocarrier, the Channel-PNA-siRNA (CPR) complex, for enhanced siRNA delivery.
- To facilitate endosomal escape and overcome lysosomal degradation of siRNA.
Main Methods:
- Utilized the M2 proton channel transmembrane domain (M2TM) for proton influx and siRNA anchoring.
- Employed a peptide nucleic acid (PNA) linker for stable, non-covalent siRNA tethering.
- Investigated the endosomal pathway and lysosomal colocalization of delivered siRNA.
Main Results:
- The CPR complex effectively induced osmotic rupture of endosomes, promoting endosomal escape.
- Reduced colocalization of siRNA with lysosomes, enhancing gene regulation efficiency.
- Demonstrated dual-target gene knockdown using CPR-tethered liposomes.
Conclusions:
- Modulating the endosomal pH environment is a viable strategy to prevent lysosomal degradation.
- The CPR nanocarrier design offers a versatile platform for targeted RNA delivery.
- This approach holds therapeutic potential for genetic diseases.
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