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Updated: Jan 29, 2026
11:53
Predicting Gene Silencing Through the Spatiotemporal Control of siRNA Release from Photo-responsive Polymeric Nanocarriers
Published on: July 21, 2017
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Highly efficient gene release in spatiotemporal precision approached by light and pH dual responsive copolymers
Hung-Hsun Lu1, Cheng-Hung Huang1, Ting-Yun Shiue2
1Department of Chemistry , Frontier Research Center on Fundamental and Applied Sciences of Matters , National Tsing Hua University , 101, Sec 2, Kuang-Fu Rd. , Hsinchu 30013 , Taiwan .
Chemical Science
|February 5, 2019
Summary
A novel triblock copolymer (PEG-PDMAEMA-PPy) acts as a gene delivery system. Photo-irradiation triggers efficient siRNA release, showing potential for stimuli-responsive gene therapy.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Gene delivery systems are crucial for targeted therapy.
- Stimuli-responsive materials offer enhanced control over drug release.
- Triblock copolymers present versatile platforms for nanomedicine applications.
Purpose of the Study:
- To develop and evaluate a triblock copolymer micelleplex for efficient and stimuli-responsive gene delivery.
- To investigate the photo-triggered siRNA release mechanism.
- To assess the *in vitro* efficacy and safety of the developed system.
Main Methods:
- Synthesis of poly(ethylene glycol)-b-poly(2-dimethylaminoethyl methacrylate)-b-poly(pyrenylmethyl methacrylate) (PEG-PDMAEMA-PPy) triblock copolymer.
- Formation of siRNA-condensed micelleplexes.
- Evaluation of siRNA release kinetics under physiological and photo-irradiated conditions.
- *In vitro* cytotoxicity, cellular uptake, and gene knockdown assays.
Main Results:
- The PEG-PDMAEMA-PPy micelleplex demonstrated high stability under physiological conditions.
- Photo-irradiation induced a significant and rapid release of siRNA (78% within 1 h).
- The system exhibited negligible cytotoxicity, high cellular uptake, and effective gene knockdown *in vitro*.
Conclusions:
- The developed triblock copolymer micelleplex is a promising candidate for stimuli-responsive gene therapy.
- Light- and pH-induced structural transitions of the micelles are key to controlled siRNA release.
- The system offers a safe and efficient approach for targeted gene delivery applications.
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