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Published on: June 12, 2018
A reduction-sensitive carrier system using mesoporous silica nanospheres with biodegradable polyester as caps
Hongyan He1, Huihui Kuang, Lesan Yan
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
Physical Chemistry Chemical Physics : PCCP
|July 25, 2013
Summary
Researchers developed smart mesoporous silica nanoparticles (MSN) with biodegradable polymer caps for controlled intracellular drug release. These MSN nanoparticles effectively deliver anticancer drugs like doxorubicin (DOX) to tumor cells, showing promising cancer therapy potential.
Area of Science:
- Nanotechnology
- Materials Science
- Biomedical Engineering
Background:
- Mesoporous silica nanoparticles (MSN) are promising drug carriers.
- Controlled intracellular drug release remains a challenge in cancer therapy.
- Biodegradable polymers offer potential for targeted drug delivery systems.
Purpose of the Study:
- To develop a smart MSN-polymer hybrid system for controlled intracellular release of anticancer drugs.
- To engineer MSN with biodegradable polyester caps for triggered drug release.
- To evaluate the efficacy and biocompatibility of the developed drug delivery system.
Main Methods:
- Grafting poly(ethylene glycol)-b-poly(ε-caprolactone) (PEG-PCL) onto MSN via disulfide bonds.
- Encapsulating doxorubicin (DOX) into the MSN pores.
- In vitro drug release studies at different pH and with glutathione (GSH).
- Cytotoxicity assays and confocal laser scanning microscopy (CLSM) for cellular uptake and drug release.
- Antitumor activity evaluation against HeLa cells.
Main Results:
- Successful synthesis of MSN-PEG-PCL hybrid nanoparticles with disulfide linkages.
- Restricted DOX release at pH 7.4, with accelerated release in the presence of GSH, indicating triggered intracellular release.
- Good biocompatibility of the hybrid nanoparticles.
- Efficient endocytosis and intracellular DOX release observed via CLSM.
- DOX-loaded nanoparticles demonstrated comparable antitumor activity to free DOX against HeLa cells in a time-dependent manner.
Conclusions:
- The developed MSN-polymer hybrid system effectively controls intracellular anticancer drug release.
- Aliphatic biodegradable polyesters serve as effective polymer caps for smart drug delivery.
- This system presents a potential strategy for targeted cancer therapy.
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